Quotables
"The radio craze will die out in time."
Thomas Edison ; 1922
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 4713777 | Speech recognition method having noise immunity In a speech recognition system, the beginning of speech versus non-speech (a cough or noise) is distinguished by reverting to a non-speech decision process whenever the liklihood cost of template (vocabulary) patterns, including silence, is worse than a p... | 12/15/1987 |
| 4700394 | Method of recognizing speech pauses Method of recognizing pauses in a speech signal when a slowly varying noise signal is superposed on the speech signal. For the purpose of pause recognition so-called short-time mean values connected with a clock pulse are continuously determined from the ... | 10/13/1987 |
| 4700392 | Speech signal detector having adaptive threshold values Speech presence is detected by first comparing input signal absolute value versus a first threshold which is proportional to input signal RMS noise power, accumulating the first comparison output signal, then comparing the accumulated signal versus a seco... | 10/13/1987 |
| 4696041 | Apparatus for detecting an utterance boundary An utterance boundary detecting apparatus of this invention includes an acoustic processor for generating speech parameter time sequence data according to an input speech signal. The speech parameter time sequence data generated from the acoustic processo... | 09/22/1987 |
| 4688256 | Speech detector capable of avoiding an interruption by monitoring a variation of a spectrum of an input signal In a speech presence detector, the input signal (speech plus noise) is detected for power and spectral-variation per unit time. Speech presence is decided if high-power or a sudden large variation in spectral-distribution (for example, unvoiced to voiced ... | 08/18/1987 |
| 4688224 | Method of and device for correcting burst errors on low bit-rate coded speech signals transmitted on radio-communication channels In a radio transceiving system of low bit-rate coded speech signals, to be installed on mobiles, the method allows the detection and correction of burst error present in the demodulated coded signal, in the receiver. This method allows error detection by dista... | 08/18/1987 |
| 4682361 | Method of recognizing speech pauses A method of recognizing speech pauses in a speech signal even when the signal is disturbed by a slowly varying noise signal superposed thereon. Mean values which are an approximate measure of the average power of successive sections of the disturbed signa... | 07/21/1987 |
| 4630304 | Automatic background noise estimator for a noise suppression system An improved background noise estimator (320) is disclosed for use with a noise suppression system (300) for generating an estimate of the background noise power spectral density provided to noise suppressor (310), which performs speech quality enhancement... | 12/16/1986 |
| 4627091 | Low-energy-content voice detection apparatus An apparatus for detecting and storing digital data corresponding to spoken words carried by acoustic signals includes apparatus for detecting and storing the unvoiced portion of speech which often precedes the voiced portion of a word, even where the amp... | 12/02/1986 |
| 4625083 | Voice operated switch A voice operated switch for use in noisy environments is described. The switch includes independent amplifiers for separately amplifying frequency band limited speech and noise signals. The independently amplified speech and noise signals are rectified, a... | 11/25/1986 |
| 4610023 | Speech recognition system and method for variable noise environment An automotive vehicle speech recognition system sets a recording-mode reference threshold level to be lower than a recognition-mode reference threshold level. Therefore, a spoken instruction supplied to the system in a low voice while the vehicle is parke... | 09/02/1986 |
| 4597098 | Speech recognition system in a variable noise environment A speech recognition system for an automotive vehicle derive a spoken instruction start signal and a spoken instruction end signal when a smoothed spoken instruction signal exceeds or drops below a predetermined threshold level representing the intensity ... | 06/24/1986 |
| 4558459 | Speech recognition system for an automotive vehicle In a speech recognition and control system for an automobile, the microphone preamplifier gain is made inversely proportional to the background sound noise level. Noise level is determined by averaging the microphone output for 100 milliseconds after the ... | 12/10/1985 |
| 4550426 | Method and means of detecting the presence of a signal representing voice and of compressing the level of the signal A circuit that combines the functions of audio compression and voice detection comprises an amplifier in a negative-feedback configuration in which the feedback signal is the product of the output of the amplifier and a syllabic voltage derived from that ... | 10/29/1985 |
| 4542525 | Method and apparatus for classifying audio signals The null transitions of an audio frequency signal are converted by Schmitt trigger circuits, one of which has a small hysteresis range centered on the null value and the other of which has a much larger hysteresis range likewise centered on the null value... | 09/17/1985 |
| 4541110 | Circuit for automatic selection between speech and music sound signals Speech versus music is decided by comparing the presence of pauses greater than 32, 60 and 500 ms in the lower input spectrum, and 4 ms in the higher input spectrum.... | 09/10/1985 |
| 4532648 | Speech recognition system for an automotive vehicle A speech recognition system for an automotive vehicle which can record or recognize spoken instruction phrases reliably even when engine noise increases high within the passenger compartment. When the engine begins to operate, the gain of an amplifier of ... | 07/30/1985 |
| 4509186 | Method and apparatus for speech message recognition Speech recognition by first log-compressing the speech signal, then filtering into subband signals which are subtracted to form an indicator of voiced, unvoiced and silence intervals, whereby sequence and duration patterns are coded in +1, -1, and zero.... | 04/02/1985 |
| 4506379 | Method and system for discriminating human voice signal Audible entertainment signals are also filtered to detect speech presence whereby only frequencies in the band 0-150 Hz, are applied to vibrate a listener's chair for special effects.... | 03/19/1985 |
| 4484344 | Voice operated switch A voice operated switch having minimum signal amplification in the stages which separate the voice signals from the noise signals. The majority of amplification is then applied only to the syllabic rate voice component detected by an offset threshold in t... | 11/20/1984 |
| 4461024 | Input device for computer speech recognition system Systems for the recognition of speech by computer have usually required t the speech be of a strictly standarized nature, free of such features as regional accent, and unaccompanied by background noise. The problem has been to produce a system providing ... | 07/17/1984 |
| 4457013 | Digital speech/data discriminator for transcoding unit A digital transcoding unit receiving incoming PCM-coded speech and data samples to be distributed after selective quantization to different outgoing channels, with fewer quantizing bits assigned to speech samples than to data samples, includes a discrimin... | 06/26/1984 |
| 4441203 | Music speech filter A music/speech filter is provided for automatically determining whether an audio signal is music or speech by obtaining a relative measure of the energy in a selective frequency range and, from this determination, controlling the passage or path of the au... | 04/03/1984 |
| 4426730 | Method of detecting the presence of speech in a telephone signal and speech detector implementing said method In a method of detecting the presence of speech in a telephone signal, a signal sequence is interpreted as constituting speech if its mean power level exceeds a threshold, the value of which is decreased as the number of passages through zero level in the... | 01/17/1984 |
| 4401849 | Speech detecting method Speech signal presence is decided if total signal power is above a first threshold, and if either low or high frequency components exceed thresholds as a large fraction of the total power. Total power is calculated as the zero-order auto-correlation coeff... | 08/30/1983 |
| 4382164 | Signal stretcher for envelope generator A speech detector uses a signal classifier (19) to identify portions of a representation of the average magnitude of a group of signal samples indicative of either speech or noise. A controller (33) in the signal classifier follows a four state sequence u... | 05/03/1983 |
| 4370521 | Endpoint detector An arrangement for endpoint detection improves speech recognition accuracy and lowers rejection rates by developing an ordered list of endpoint candidates. A triple thresholding technique defines energy signal pulses. The energy pulses are combined accord... | 01/25/1983 |
| 4359604 | Apparatus for the detection of voice signals A detection apparatus for receiving an input signal containing noise and for detecting the presence of voice signals therein comprises means for attenuating the input signal and a comparator of the amplitude of the attenuated input signal relative to a va... | 11/16/1982 |
| 4357491 | Method of and apparatus for detecting speech in a voice channel signal Speech signal presence is decided based on the input signal exceeding either of two thresholds: one, a fixed threshold (TF) set at an arbitrary level relatively high above anticipated noise; the other, an adaptive threshold (TL) which idles slightly above... | 11/02/1982 |
| 4357488 | Voice discriminating system A voice discriminating system is disclosed which includes input circuitry for a pair of microphones, circuitry for detecting the presence of voiced sounds inputted to the microphones, selectively enabled circuitry for detecting the presence of unvoiced so... | 11/02/1982 |
| 4352957 | Speech detector circuit with associated gain control for a tasi system Disclosed is a centralized circuit for determining whether input signals from a plurality of channels are speech which includes memory means in which digital amplitude samples from each of the input channels are stored in real time. A control means then p... | 10/05/1982 |
| 4351983 | Speech detector with variable threshold A speech activity detection circuit and method are described in which a digitized sample of the analog speech signal in a communications system is taken n times in a period of time t. The magnitude M of each sample is calculated and the largest value of M... | 09/28/1982 |
| 4283601 | Preprocessing method and device for speech recognition device Signal-to-noise is enhanced by including the upper sideband of a sampled-speech signal with the original baseband signal for further signal processing. The invention features shifting both bands to form a continuum from 0 Hz to the sampling frequency. App... | 08/11/1981 |
| 4277645 | Multiple variable threshold speech detector A speech detector uses a signal classifier (19) to identify portions of a representation of the average magnitude of a group of signal samples indicative of either speech or noise. A controller (33) in the signal classifier follows a four state sequence u... | 07/07/1981 |
| 4275270 | Speech detector for use in an adaptive hybrid circuit A speech detector for use in an adaptive hybrid circuit is disclosed. The speech detector detects the instantaneous sign of current and voltage in a hybrid circuit and thereby determines the direction of power flow in the circuit. The direction of power f... | 06/23/1981 |
| 4243837 | Telephone transmission installation between interlocutors in a noisy environment An arrangement for controlling a telephone transmission line having an input linked to a sound detection device located in a noisy environment. The transmission line operates only for the transmission of words received by the sound detection device. The t... | 01/06/1981 |
| 4239936 | Speech recognition system A speech recognition system adaptable to noisy environments is disclosed. The system includes a recognition unit for recognizing input speech signals and a noise measuring unit for measuring the intensity of ambient noises. The system also includes a reje... | 12/16/1980 |
| 4227046 | Pre-processing system for speech recognition A pre-processing system for a speech recognition system nullifies the distortion in a received signal caused by the transmission line by forming a normalized received signal whereby the distortion is cancelled: the received signal is spectrally averaged t... | 10/07/1980 |
| 4187396 | Voice detector circuit A voice detector circuit including a slew-rate limited amplifier at the input thereof so as to reduce the interference with the voice detection process caused by impulse noise. The slew-rate limited amplifier is essentially transparent to audio signals, w... | 02/05/1980 |
| 4167653 | Adaptive speech signal detector An adaptive speech signal detector for use in a 4-wire telephone channel performs an adaptive threshold value setting operation depending on the channel noise level on a transmitter-side channel to detect a speech signal present at the transmitter. The ad... | 09/11/1979 |
