WO2008061246A2 - Method and apparatus for television audio signal type detection - Google Patents

Method and apparatus for television audio signal type detection Download PDF

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Publication number
WO2008061246A2
WO2008061246A2 PCT/US2007/085014 US2007085014W WO2008061246A2 WO 2008061246 A2 WO2008061246 A2 WO 2008061246A2 US 2007085014 W US2007085014 W US 2007085014W WO 2008061246 A2 WO2008061246 A2 WO 2008061246A2
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WO
WIPO (PCT)
Prior art keywords
television
audio signal
circuit
decoder circuit
identification
Prior art date
Application number
PCT/US2007/085014
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French (fr)
Other versions
WO2008061246A3 (en
Inventor
Yi Feng
Yong Huang
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Ess Technology, Inc.
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Publication date
Application filed by Ess Technology, Inc. filed Critical Ess Technology, Inc.
Publication of WO2008061246A2 publication Critical patent/WO2008061246A2/en
Publication of WO2008061246A3 publication Critical patent/WO2008061246A3/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/434—Disassembling of a multiplex stream, e.g. demultiplexing audio and video streams, extraction of additional data from a video stream; Remultiplexing of multiplex streams; Extraction or processing of SI; Disassembling of packetised elementary stream
    • H04N21/4341—Demultiplexing of audio and video streams
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/236—Assembling of a multiplex stream, e.g. transport stream, by combining a video stream with other content or additional data, e.g. inserting a URL [Uniform Resource Locator] into a video stream, multiplexing software data into a video stream; Remultiplexing of multiplex streams; Insertion of stuffing bits into the multiplex stream, e.g. to obtain a constant bit-rate; Assembling of a packetised elementary stream
    • H04N21/2368—Multiplexing of audio and video streams
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/238—Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
    • H04N21/2383—Channel coding or modulation of digital bit-stream, e.g. QPSK modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/438—Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving MPEG packets from an IP network
    • H04N21/4382—Demodulation or channel decoding, e.g. QPSK demodulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/439—Processing of audio elementary streams
    • H04N21/4394—Processing of audio elementary streams involving operations for analysing the audio stream, e.g. detecting features or characteristics in audio streams
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
    • H04N21/81—Monomedia components thereof
    • H04N21/8106—Monomedia components thereof involving special audio data, e.g. different tracks for different languages

Definitions

  • the television decoder circuit apparatus processes a television audio signal and makes an identification of any of a television stereo audio signal and a television dual language audio signal, such that decoder circuit apparatus has both the ability to detect a television stereo audio signal, and the ability to detect a television dual language audio signal.
  • the television decoder circuit apparatus includes a period detection circuit, an energy measurement circuit, and television audio signal decision circuit. In some embodiments, the period detection circuit and energy measurement circuit operate in a digital domain.
  • the period detection period detection circuit also includes 1) circuitry detecting, in the television audio signal, the television stereo audio signal; and 2) circuitry detecting, in the television audio signal, the television dual language audio signal.
  • the period detection circuit includes a zero crossing detector.
  • the energy measurement circuit also includes 1) energy measurement circuitry detecting, in the television audio signal, a television stereo audio signal; and 2) energy measurement circuitry detecting, in the television audio signal, a television dual language audio signal.
  • the energy measurement circuit includes squaring and low pass filter circuit. In some embodiments, the energy measurement circuit includes squaring and leaky accumulator circuit.
  • the television audio signal decision circuit is coupled to the period detection circuit and the energy measurement circuit.
  • the television audio signal decision circuit makes the identification of any of the television stereo audio signal and the television dual language audio signal, based on agreement between the period detection circuit and the energy measurement circuit.
  • the television audio signal includes the television stereo audio signal but not the television dual language audio signal, does not include the television stereo audio signal but includes the television dual language audio signal, the television audio signal includes the television stereo audio signal and the television dual language audio signal, and includes neither the television stereo audio signal nor the television dual language audio signal.
  • the television audio signal decision circuit identifies the television stereo audio signal, based on both the period detection circuit and the energy measurement circuit detecting the television stereo audio signal.
  • the television audio signal decision circuit identifies the television dual language audio signal, based on both the period detection circuit and the energy measurement circuit detecting the television dual language audio signal.
  • the television audio signal decision circuit does not identify the television stereo audio signal, based on at least one of the period detection circuit and the energy measurement circuit not detecting the television stereo audio signal. [0010] In one embodiment, the television audio signal decision circuit does not identify the television dual language audio signal, based on at least one of the period detection circuit and the energy measurement circuit not detecting the television dual language audio signal.
  • Various embodiments include one or more thresholds to improve the reliability and stability of the identification.
  • One embodiment of the television audio signal decision circuit requires the energy measurement circuit to measure a minimum threshold of energy.
  • One embodiment of the television audio signal decision circuit requires the energy measurement circuit to measure a minimum threshold of energy for a minimum duration.
  • One embodiment is responsive to the television audio signal decision circuit making a preliminary identification of a change in the television stereo audio signal, by requiring the energy measurement circuit and the period detection circuit to find agree on the preliminary identification for a minimum number of times greater than one.
  • a benefit of the combined period detection and energy measurement is noise tolerance superior to other television decoder circuit apparatuses without the period detection circuit or without the energy measurement circuit.
  • Various embodiments of the television decoder circuit apparatus are a television, a computer, a set top box, and a hand-held device.
  • Figure 1 is a block diagram of the television audio signal type detector preprocessor.
  • Figure 2 is a block diagram of the television audio signal type detector.
  • Figure 3 is a block diagram of a television signal device including the television audio signal type detector.
  • Figure 4 is a process flow for detecting the television audio signal type.
  • FIG. 1 is a block diagram of the television audio signal type detector preprocessor.
  • a preprocessor 102 performs front end processing for the audio signal type detector 120.
  • circuitry 110 receives a digitized audio signal from tuner audio output.
  • Twin FM demodulators 112 and 114 demodulate different targeted carriers, for compatibility with various television standards such as BTSC (e.g., US), A2 (e.g., Germany, Korea, Eastern Europe), and EIAJ (Japan).
  • Two carrier systems such as A2 fully utilize the twin FM demodulators 112 and 114.
  • Single carrier systems such as BTSC can use a dummy carrier.
  • the outputs of the twin FM demodulators 112 and 114 are selected by multiplexer 116.
  • the stereo/dual ID signals are near carrier 1.
  • the stereo/dual ID signals are near carrier 2.
  • the selected carrier is then downconverted. Because Rec. 601, incorporated herein by reference, has a primary sample rate of 13.5 MHz, prior sampling rates tend to be multiples thereof.
  • a downconverted sample rate is chosen for ease of decimation and sufficient oversampling, relative to the frequency of audio ID signals of around 55 kHz. Thus, for example, a prior sampling rate of 27 MHz is downconverted by 1/75 to a sampling rate of 360 kHz.
  • the downconverted signal is passed to the audio signal type detector 120.
  • FIG. 2 is a block diagram of the television audio signal type detector 120.
  • the downconverted signal is received by a band pass filter 210.
  • the band pass filter 210 is then set to filter the ID tone for respective audio signal types, such as stereo, mono, and dual language audio programs, for a programmable amount of time, as will again be seen in Figure 3.
  • the band pass filter 210 eliminates noise and harmonics from the signal.
  • the television audio signal type detector 120 passes the output of the band pass filter 210 to a period detection circuit and an energy detection circuit. Joint processing by the period detection circuit and the energy detection circuit improves performance in the presence of noise, relative to processing by just the period detection circuit and processing by just the energy detection circuit.
  • An example of a period detection circuit is a zero crossing detector 220.
  • An example of an energy measurement circuit is squaring logic 220 followed by a low pass filter or leaky accumulator 232.
  • the outputs of the period detection circuit and the energy detection circuit are combined in a decision module 240 which includes circuitry implementing multiple counters and thresholds. The operation of the decision module is shown in more detail in Figure 4.
  • Figure 3 is a block diagram of a television signal device 310 including the television audio signal type detector.
  • a television signal receiver 312 sends video and audio signals respectively to the television audio signal processing 320 and the television video signal processing 330.
  • the television audio signal processing 320 includes the preprocessor for television audio signal type detector 102 and the television audio signal type detector 120.
  • the television signal output 340 plays the outputs of the television audio signal processing 320 and the television video signal processing 330.
  • Figure 4 is a process flow for detecting the television audio signal type. In Figure 4, multiple counters and thresholds make certain that the audio signal type identification is reliable, especially in a noisy environment.
  • a television audio signal type energy measurement is performed, such as by the energy measurement circuit of Figure 2.
  • the energy measurement is compared with threshold #1, to require a minimum threshold of energy in the identified audio signal type.
  • a counter #1 is processed to reflect sufficient or insufficient energy. Step 404 is repeated an appropriate number of time in view of step 406.
  • the counter #1 is compared against a threshold #2, to require a minimum duration for the minimum threshold of energy. If threshold #2 is not met, counter #1 is cleared. A counter #2 is processed to reflect sufficient or insufficient duration of the minimum threshold of energy. Step 406 is repeated an appropriate number of time in view of step 408. [0036] At 408, counter #2 is compared to threshold # 3 to detect stereo, dual language, or mono signals. This comparison implements faster switching when the audio program is switching from stereo or dual language to mono, compared to when the audio program is switching from mono to stereo or dual language. This reduces the influence of noise. [0037] At 410, the television audio signal type period detection is performed, such as with the period detection circuit of Figure 2.
  • the television audio signal type detection is compared from the results of steps 408 and 410. If there is agreement between steps 408 and 410, and a new audio program type is detected, a preliminary identification is complete. Counter #3 is processed to reflect this change in the audio program type. [0039] At 414, the counter #3 is compared to threshold #4 to increase the reliability of mode change detection. Threshold #4 therefore controls how resistant the audio circuitry is, to changing the identification of the audio program.
  • One embodiment is responsive to the television audio signal decision circuit making a preliminary identification of a change in the television stereo audio signal, by requiring the energy measurement circuit and the period detection circuit to find agree on the preliminary identification for a minimum number of times greater than one.

Abstract

A television decoder circuit apparatus processes a television audio signal and makes an identification of any of a television stereo audio signal and a television dual language audio signal, such that decoder circuit apparatus has both the ability to detect a television stereo audio signal and the ability to detect a television dual language audio signal. The television decoder circuit apparatus includes a period detection circuit, an energy measurement circuit, and television audio signal decision circuit, in some embodiments, the period detection circuit and energy measurement circuit operate in a digital domain. A method detects a period of the television audio signal, measures an energy of the television audio signal, and makes the identification of the television stereo audio signal, based on agreement of said period and said energy on the identification.

Description

METHOD AND APPARATUS FOR TELEVISION AUDIO SIGNAL TYPE DETECTION
SUMMARY [0001] Various aspects of the technology are directed to a television decoder circuit apparatus. The television decoder circuit apparatus processes a television audio signal and makes an identification of any of a television stereo audio signal and a television dual language audio signal, such that decoder circuit apparatus has both the ability to detect a television stereo audio signal, and the ability to detect a television dual language audio signal. [0002] The television decoder circuit apparatus includes a period detection circuit, an energy measurement circuit, and television audio signal decision circuit. In some embodiments, the period detection circuit and energy measurement circuit operate in a digital domain. [0003] The period detection period detection circuit also includes 1) circuitry detecting, in the television audio signal, the television stereo audio signal; and 2) circuitry detecting, in the television audio signal, the television dual language audio signal. In some embodiments, the period detection circuit includes a zero crossing detector.
[0004] The energy measurement circuit also includes 1) energy measurement circuitry detecting, in the television audio signal, a television stereo audio signal; and 2) energy measurement circuitry detecting, in the television audio signal, a television dual language audio signal. In some embodiments, the energy measurement circuit includes squaring and low pass filter circuit. In some embodiments, the energy measurement circuit includes squaring and leaky accumulator circuit.
[0005] The television audio signal decision circuit is coupled to the period detection circuit and the energy measurement circuit. The television audio signal decision circuit makes the identification of any of the television stereo audio signal and the television dual language audio signal, based on agreement between the period detection circuit and the energy measurement circuit.
[0006] Variously, the television audio signal: includes the television stereo audio signal but not the television dual language audio signal, does not include the television stereo audio signal but includes the television dual language audio signal, the television audio signal includes the television stereo audio signal and the television dual language audio signal, and includes neither the television stereo audio signal nor the television dual language audio signal. [0007] In one embodiment, the television audio signal decision circuit identifies the television stereo audio signal, based on both the period detection circuit and the energy measurement circuit detecting the television stereo audio signal.
[0008] In one embodiment, the television audio signal decision circuit identifies the television dual language audio signal, based on both the period detection circuit and the energy measurement circuit detecting the television dual language audio signal.
[0009] In one embodiment, the television audio signal decision circuit does not identify the television stereo audio signal, based on at least one of the period detection circuit and the energy measurement circuit not detecting the television stereo audio signal. [0010] In one embodiment, the television audio signal decision circuit does not identify the television dual language audio signal, based on at least one of the period detection circuit and the energy measurement circuit not detecting the television dual language audio signal.
[0011] Various embodiments include one or more thresholds to improve the reliability and stability of the identification. One embodiment of the television audio signal decision circuit requires the energy measurement circuit to measure a minimum threshold of energy. One embodiment of the television audio signal decision circuit requires the energy measurement circuit to measure a minimum threshold of energy for a minimum duration. One embodiment is responsive to the television audio signal decision circuit making a preliminary identification of a change in the television stereo audio signal, by requiring the energy measurement circuit and the period detection circuit to find agree on the preliminary identification for a minimum number of times greater than one.
[0012] A benefit of the combined period detection and energy measurement is noise tolerance superior to other television decoder circuit apparatuses without the period detection circuit or without the energy measurement circuit. [0013] Various embodiments of the television decoder circuit apparatus are a television, a computer, a set top box, and a hand-held device.
[0014] Another aspect of the technology performs:
[0015] detecting a period of the television audio signal;
[0016] measuring an energy of the television audio signal; and [0017] making the identification of the television stereo audio signal, based on agreement of said period and said energy on the identification.
[0018] Another aspect of the technology performs:
[0019] detecting a period of the television audio signal; and
[0020] measuring an energy of the television audio signal; and [0021] making the identification of the television dual language audio signal, based on agreement of said period and said energy on the identification.
[0022] Other embodiments and variations under the claims are evident to those of ordinary skill in the art.
BRIEF DESCRIPTION OF THE DRAWINGS
[0023] Figure 1 is a block diagram of the television audio signal type detector preprocessor. [0024] Figure 2 is a block diagram of the television audio signal type detector. [0025] Figure 3 is a block diagram of a television signal device including the television audio signal type detector.
[0026] Figure 4 is a process flow for detecting the television audio signal type.
DETAILED DESCRIPTION [0027] Figure 1 is a block diagram of the television audio signal type detector preprocessor. A preprocessor 102 performs front end processing for the audio signal type detector 120. In the preprocessor 102, circuitry 110 receives a digitized audio signal from tuner audio output. Twin FM demodulators 112 and 114 demodulate different targeted carriers, for compatibility with various television standards such as BTSC (e.g., US), A2 (e.g., Germany, Korea, Eastern Europe), and EIAJ (Japan). Two carrier systems such as A2 fully utilize the twin FM demodulators 112 and 114. Single carrier systems such as BTSC can use a dummy carrier. The outputs of the twin FM demodulators 112 and 114 are selected by multiplexer 116. For the single carrier case, the stereo/dual ID signals are near carrier 1. For the two carrier case, the stereo/dual ID signals are near carrier 2. The selected carrier is then downconverted. Because Rec. 601, incorporated herein by reference, has a primary sample rate of 13.5 MHz, prior sampling rates tend to be multiples thereof. A downconverted sample rate is chosen for ease of decimation and sufficient oversampling, relative to the frequency of audio ID signals of around 55 kHz. Thus, for example, a prior sampling rate of 27 MHz is downconverted by 1/75 to a sampling rate of 360 kHz. The downconverted signal is passed to the audio signal type detector 120. [0028] Figure 2 is a block diagram of the television audio signal type detector 120. The downconverted signal is received by a band pass filter 210. The band pass filter 210 is then set to filter the ID tone for respective audio signal types, such as stereo, mono, and dual language audio programs, for a programmable amount of time, as will again be seen in Figure 3. The band pass filter 210 eliminates noise and harmonics from the signal. The television audio signal type detector 120 passes the output of the band pass filter 210 to a period detection circuit and an energy detection circuit. Joint processing by the period detection circuit and the energy detection circuit improves performance in the presence of noise, relative to processing by just the period detection circuit and processing by just the energy detection circuit. [0029] An example of a period detection circuit is a zero crossing detector 220.
[0030] An example of an energy measurement circuit is squaring logic 220 followed by a low pass filter or leaky accumulator 232. The leaky accumulator is a first order accumulator, defines by the formula y(n) = a*y(n-l)+b*x(n), where 0 < a < 1 affects the filter time constant, and where b > 0 is the gain of the filter. [0031] The outputs of the period detection circuit and the energy detection circuit are combined in a decision module 240 which includes circuitry implementing multiple counters and thresholds. The operation of the decision module is shown in more detail in Figure 4. [0032] Figure 3 is a block diagram of a television signal device 310 including the television audio signal type detector. In the television signal device 310, a television signal receiver 312 sends video and audio signals respectively to the television audio signal processing 320 and the television video signal processing 330. The television audio signal processing 320 includes the preprocessor for television audio signal type detector 102 and the television audio signal type detector 120. The television signal output 340 plays the outputs of the television audio signal processing 320 and the television video signal processing 330. [0033] Figure 4 is a process flow for detecting the television audio signal type. In Figure 4, multiple counters and thresholds make certain that the audio signal type identification is reliable, especially in a noisy environment.
[0034] At 404, a television audio signal type energy measurement is performed, such as by the energy measurement circuit of Figure 2. The energy measurement is compared with threshold #1, to require a minimum threshold of energy in the identified audio signal type. A counter #1 is processed to reflect sufficient or insufficient energy. Step 404 is repeated an appropriate number of time in view of step 406.
[0035] At 406, the counter #1 is compared against a threshold #2, to require a minimum duration for the minimum threshold of energy. If threshold #2 is not met, counter #1 is cleared. A counter #2 is processed to reflect sufficient or insufficient duration of the minimum threshold of energy. Step 406 is repeated an appropriate number of time in view of step 408. [0036] At 408, counter #2 is compared to threshold # 3 to detect stereo, dual language, or mono signals. This comparison implements faster switching when the audio program is switching from stereo or dual language to mono, compared to when the audio program is switching from mono to stereo or dual language. This reduces the influence of noise. [0037] At 410, the television audio signal type period detection is performed, such as with the period detection circuit of Figure 2. [0038] At 412, the television audio signal type detection is compared from the results of steps 408 and 410. If there is agreement between steps 408 and 410, and a new audio program type is detected, a preliminary identification is complete. Counter #3 is processed to reflect this change in the audio program type. [0039] At 414, the counter #3 is compared to threshold #4 to increase the reliability of mode change detection. Threshold #4 therefore controls how resistant the audio circuitry is, to changing the identification of the audio program.
[0040] One embodiment is responsive to the television audio signal decision circuit making a preliminary identification of a change in the television stereo audio signal, by requiring the energy measurement circuit and the period detection circuit to find agree on the preliminary identification for a minimum number of times greater than one.
[0041] While the present invention is disclosed by reference to the preferred embodiments and examples detailed above, it is to be understood that these examples are intended in an illustrative rather than in a limiting sense. It is contemplated that modifications and combinations will readily occur to those skilled in the art, which modifications and combinations will be within the spirit of the invention and the scope of the following claims. What is claimed is:

Claims

1. A television decoder circuit apparatus processing a television audio signal and making an identification of any of a television stereo audio signal and a television dual language audio signal, comprising: a period detection circuit comprising: period detection circuitry detecting, in the television audio signal, the television stereo audio signal; and period detection circuitry detecting, in the television audio signal, the television dual language audio signal; an energy measurement circuit comprising: energy measurement circuitry detecting, in the television audio signal, a television stereo audio signal; and energy measurement circuitry detecting, in the television audio signal, a television dual language audio signal; and television audio signal decision circuit coupled to the period detection circuit and the energy measurement circuit, the television audio signal decision circuit making the identification of any of the television stereo audio signal and the television dual language audio signal based on agreement between the period detection circuit and the energy measurement circuit.
2. The television decoder circuit apparatus of claim 1 , wherein the television audio signal includes the television stereo audio signal and does not include the television dual language audio signal.
3. The television decoder circuit apparatus of claim 1, wherein the television audio signal includes does not include the television stereo audio signal and includes the television dual language audio signal.
4. The television decoder circuit apparatus of claim 1, wherein the television audio signal includes the television stereo audio signal and the television dual language audio signal.
5. The television decoder circuit apparatus of claim 1 , wherein the television audio signal includes neither the television stereo audio signal nor the television dual language audio signal.
6. The television decoder circuit apparatus of claim 1, wherein television audio signal decision circuit identifies the television stereo audio signal, based on both the period detection circuit and the energy measurement circuit detecting the television stereo audio signal.
7. The television decoder circuit apparatus of claim 1 , wherein television audio signal decision circuit identifies the television dual language audio signal, based on both the period detection circuit and the energy measurement circuit detecting the television dual language audio signal.
8. The television decoder circuit apparatus of claim 1, wherein television audio signal decision circuit does not identify the television stereo audio signal, based on at least one of the period detection circuit and the energy measurement circuit not detecting the television stereo audio signal.
9. The television decoder circuit apparatus of claim 1 , wherein television audio signal decision circuit does not identify the television dual language audio signal, based on at least one of the period detection circuit and the energy measurement circuit not detecting the television dual language audio signal.
10. The television decoder circuit apparatus of claim 1, wherein the period detection circuit includes a zero crossing detector.
11. The television decoder circuit apparatus of claim 1 , wherein the energy measurement circuit includes squaring and low pass filter circuit.
12. The television decoder circuit apparatus of claim 1 , wherein the energy measurement circuit includes squaring and leaky accumulator circuit.
13. The television decoder circuit apparatus of claim 1, wherein, in making the identification of any of the television stereo audio signal and the television dual language audio signal, the television audio signal decision circuit requires the energy measurement circuit to measure a minimum threshold of energy.
14. The television decoder circuit apparatus of claim 1 , wherein, in making the identification of any of the television stereo audio signal and the television dual language audio signal, the television audio signal decision circuit requires the energy measurement circuit to measure a minimum threshold of energy for a minimum duration.
15. The television decoder circuit apparatus of claim 1 , wherein, in making the identification of any of the television stereo audio signal and the television dual language audio signal, responsive to the television audio signal decision circuit making a preliminary identification of a change in the television stereo audio signal, requiring the energy measurement circuit and the period detection circuit to find agree on the preliminary identification for a minimum number of times greater than one.
16. The television decoder circuit apparatus of claim 1 , wherein the television decoder circuit apparatus has noise tolerance superior to other television decoder circuit apparatuses without the period detection circuit.
17. The television decoder circuit apparatus of claim 1, wherein the television decoder circuit apparatus has noise tolerance superior to other television decoder circuit apparatuses without the period detection circuit.
17. The television decoder circuit apparatus of claim 1 , wherein the television decoder circuit apparatus is a television.
18. The television decoder circuit apparatus of claim 1 , wherein the television decoder circuit apparatus is a computer.
19. The television decoder circuit apparatus of claim 1 , wherein the television decoder circuit apparatus is a set top box.
20. The television decoder circuit apparatus of claim 1 , wherein the television decoder circuit apparatus is a hand-held device.
21. The television decoder circuit apparatus of claim 1 , wherein the period detection circuit and energy measurement circuit operate in a digital domain.
22. The television decoder circuit apparatus of claim 1 , wherein, in making the identification of any of the television stereo audio signal and the television dual language audio signal, responsive to the television audio signal decision circuit making a preliminary identification of a change in the television stereo audio signal, switching from the television stereo audio signal or the television dual language audio signal to a television mono audio signal is faster than switching from the television mono audio signal to the television stereo audio signal or the television dual language audio signal.
23. A method of processing a television audio signal and making an identification of any of a television stereo audio signal and a television dual language audio signal, comprising: detecting a period of the television audio signal; measuring an energy of the television audio signal; and making the identification of the television stereo audio signal, based on agreement of said period and said energy on the identification.
24. A method of processing a television audio signal and making an identification of any of a television stereo audio signal and a television dual language audio signal, comprising: detecting a period of the television audio signal; and measuring an energy of the television audio signal; and making the identification of the television dual language audio signal, based on agreement of said period and said energy on the identification.
25. A television decoder circuit apparatus processing a television audio signal and making an identification of any of a television stereo audio signal and a television dual language audio signal, comprising: means for detecting a period of the television audio signal; means for measuring an energy of the television audio signal; and means for making the identification of the television stereo audio signal, based on agreement of said period and said energy on the identification.
26. A television decoder circuit apparatus processing a television audio signal and making an identification of any of a television stereo audio signal and a television dual language audio signal, comprising: means for detecting a period of the television audio signal; and means for measuring an energy of the television audio signal; and means for making the identification of the television dual language audio signal, based on agreement of said period and said energy on the identification.
PCT/US2007/085014 2006-11-16 2007-11-16 Method and apparatus for television audio signal type detection WO2008061246A2 (en)

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US60/866,192 2006-11-16

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