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Class Information
Number: 704/213
Name: Data processing: speech signal processing, linguistics, language translation, and audio compression/decompression > Speech signal processing > For storage or transmission > Time > Zero crossing
Description: Subject matter wherein the zero crossings of the signal are used to measure time or frequency.

Patents under this class:
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Patent Number Title Of Patent Date Issued
8682654 Systems and methods for classifying sports video Mar. 25, 2014
8655156 Auxiliary audio transmission for preserving synchronized playout with paced-down video Feb. 18, 2014
8635065 Apparatus and method for automatic extraction of important events in audio signals Jan. 21, 2014
8554547 Voice activity decision base on zero crossing rate and spectral sub-band energy Oct. 8, 2013
8554560 Voice activity detection Oct. 8, 2013
8489404 Method for detecting audio signal transient and time-scale modification based on same Jul. 16, 2013
8478587 Voice analysis device, voice analysis method, voice analysis program, and system integration circuit Jul. 2, 2013
8326612 Non-speech section detecting method and non-speech section detecting device Dec. 4, 2012
8311813 Voice activity detection system and method Nov. 13, 2012
8296133 Voice activity decision base on zero crossing rate and spectral sub-band energy Oct. 23, 2012
8248109 Methods and systems for detection of zero crossings in a signal Aug. 21, 2012
8160887 Adaptive interpolation in upsampled audio signal based on frequency of polarity reversals Apr. 17, 2012
8156179 Grid-enabled, service-oriented architecture for enabling high-speed computing applications Apr. 10, 2012
8069039 Sound signal processing apparatus and program Nov. 29, 2011
8046215 Method and apparatus to detect voice activity by adding a random signal Oct. 25, 2011
8032366 Method and apparatus for low bit rate speech coding detection Oct. 4, 2011
8015000 Classification-based frame loss concealment for audio signals Sep. 6, 2011
7983906 Adaptive voice mode extension for a voice activity detector Jul. 19, 2011
7970121 Tone, modulated tone, and saturated tone detection in a voice activity detection device Jun. 28, 2011
7929520 Method, system and apparatus for providing signal based packet loss concealment for memoryless codecs Apr. 19, 2011
7805297 Classification-based frame loss concealment for audio signals Sep. 28, 2010
7702502 Apparatus for signal decomposition, analysis and reconstruction Apr. 20, 2010
7555429 Sound signal processing apparatus and degree of speech computation method Jun. 30, 2009
7447279 Method and system for indicating zero-crossings of a signal in the presence of noise Nov. 4, 2008
7363232 Method and system for enabling audio speed conversion Apr. 22, 2008
7277537 Tone, modulated tone, and saturated tone detection in a voice activity detection device Oct. 2, 2007
7253600 Constant slope ramp circuits for sample-data circuits Aug. 7, 2007
7184952 Method and system for masking speech Feb. 27, 2007
7020177 Method and apparatus to transfer information Mar. 28, 2006
6993477 Methods and apparatus for adaptive signal processing involving a Karhunen-Loeve basis Jan. 31, 2006
6832194 Audio recognition peripheral system Dec. 14, 2004
6826525 Method and device for detecting a transient in a discrete-time audio signal Nov. 30, 2004
RE38269 Enhancement of speech coding in background noise for low-rate speech coder Oct. 7, 2003
6480822 Low complexity random codebook structure Nov. 12, 2002
6453282 Method and device for detecting a transient in a discrete-time audiosignal Sep. 17, 2002
6285979 Phoneme analyzer Sep. 4, 2001
6272184 Non-coherent frequency shift keying detection scheme Aug. 7, 2001
6219635 Instantaneous detection of human speech pitch pulses Apr. 17, 2001
6205422 Morphological pure speech detection using valley percentage Mar. 20, 2001
6154721 Method and device for detecting voice activity Nov. 28, 2000
6108678 Method and apparatus to detect a floating point mantissa of all zeros or all ones Aug. 22, 2000
5970447 Detection of tonal signals Oct. 19, 1999
5842172 Method and apparatus for modifying the play time of digital audio tracks Nov. 24, 1998
5809455 Method and device for discriminating voiced and unvoiced sounds Sep. 15, 1998
5774862 Computer communication system Jun. 30, 1998
5774855 Method of speech synthesis by means of concentration and partial overlapping of waveforms Jun. 30, 1998
5749064 Method and system for time scale modification utilizing feature vectors about zero crossing points May. 5, 1998
5737725 Method and system for automatically generating new voice files corresponding to new text from a script Apr. 7, 1998
5708759 Speech recognition using phoneme waveform parameters Jan. 13, 1998
5694517 Signal discrimination circuit for determining the type of signal transmitted via a telephone network Dec. 2, 1997

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