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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:
| Patent Number |
Title Of Patent |
Date Issued |
| 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 |
| 5774855 |
Method of speech synthesis by means of concentration and partial overlapping of waveforms |
Jun. 30, 1998 |
| 5774862 |
Computer communication system |
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 |
| 5675709 |
System for efficiently processing digital sound data in accordance with index data of feature quantities of the sound data |
Oct. 7, 1997 |
| 5661759 |
Digital FSK receiver using double zero-crossing |
Aug. 26, 1997 |
| 5659660 |
Method of transmitting and/or storing digitized, data-reduced audio signals |
Aug. 19, 1997 |
| 5649055 |
Voice activity detector for speech signals in variable background noise |
Jul. 15, 1997 |
| 5426745 |
Apparatus including a pair of neural networks having disparate functions cooperating to perform instruction recognition |
Jun. 20, 1995 |
| 5357595 |
Sound recording and reproducing apparatus for detecting and compensating for recorded periods of silence during replay |
Oct. 18, 1994 |
| 5295223 |
Voice/voice band data discrimination apparatus |
Mar. 15, 1994 |
| 5159638 |
Speech detector with improved line-fault immunity |
Oct. 27, 1992 |
| 5157727 |
Process for digitizing speech |
Oct. 20, 1992 |
| 5131042 |
Music tone pitch shift apparatus |
Jul. 14, 1992 |
| 5109418 |
Method and an arrangement for the segmentation of speech |
Apr. 28, 1992 |
| 5007000 |
Classification of audio signals on a telephone line |
Apr. 9, 1991 |
| 4912765 |
Voice band data rate detector |
Mar. 27, 1990 |
| 4899386 |
Device for deciding pole-zero parameters approximating spectrum of an input signal |
Feb. 6, 1990 |
| 4860355 |
Method of and device for speech signal coding and decoding by parameter extraction and vector quantization techniques |
Aug. 22, 1989 |
| 4764963 |
Speech pattern compression arrangement utilizing speech event identification |
Aug. 16, 1988 |
| 4706293 |
Circuitry for characterizing speech for tamper protected recording |
Nov. 10, 1987 |
| 4652857 |
Method and apparatus for transmitting wide-bandwidth frequency signals from mines and other power restricted environments |
Mar. 24, 1987 |
| 4626827 |
Method and system for data compression by variable frequency sampling |
Dec. 2, 1986 |
| 4568912 |
Method and system for translating digital signal sampled at variable frequency |
Feb. 4, 1986 |
| 4545065 |
Extrema coding signal processing method and apparatus |
Oct. 1, 1985 |
| RE31614 |
Decreasing time duration of recorded speech |
Jun. 26, 1984 |
| 4443857 |
Process for detecting the melody frequency in a speech signal and a device for implementing same |
Apr. 17, 1984 |
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