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| Number | Title | Issue Date |
| 4360708 | Speech processor having speech analyzer and synthesizer Adaptive bit allocation optimizes the encoded transmission of speech signal parameters. Allocation is controlled by a voiced/unvoiced decision signal derived from occurrence rate distributions of Partial Correlation Coefficient K1.... | 11/23/1982 |
| 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 |
| 4357489 | Low voltage speech synthesis system with pulse width digital-to-analog converter Integrated circuit speech synthesis system utilizing complementary metal-insulator-semiconductor technology to achieve low voltage operation, wherein a pluse width modulated digital-to-analog converter is employed to provide for accurate conversion of dig... | 11/02/1982 |
| 4355204 | Speech synthesizing arrangement having at least two distortion circuits This improved voice-excited speed synthesizer expands the voice-band spectrum to generate high-frequency band excitation signal by using two separate distortion networks: a full-wave rectifier for lower frequencies, and a limiter for higher frequencies. C... | 10/19/1982 |
| 4354056 | Method and apparatus for speech synthesis filter excitation A speech synthesis system utilizing a linear predictive filter. Voiced and unvoiced excitations are applied to the filter to produce a digital signal representative of human speech. The voiced excitation is provided by a repeating chirp function stored in... | 10/12/1982 |
| 4354057 | Predictive signal coding with partitioned quantization In a communication system an input predictive type signal is analyzed in successive time intervals to generate a set of prediction signals for the interval. A predictive residual signal is produced jointly responsive to the input signal and the interval p... | 10/12/1982 |
| 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 |
| 4349699 | Speech synthesizer This PARCOR-type speech synthesizer replaces a ten-stage lattice type filter with a pipeline multiplier and feedback loop, and provides a loss circuit (for bandwidth broadening) using subtraction circuits for multiplication.... | 09/14/1982 |
| 4349700 | Continuous speech recognition system Recognition of continuous speech by comparison with prestored isolated words may be confused by the merging together of spoken adjacent words (coarticulation). Improved recognition is attained by generating overlap-words, e.g., words whose first phoneme i... | 09/14/1982 |
| 4348551 | Service bargain announcement in an electronic cash register An electronic cash register includes a synthetic speech sound generation system for providing an audible announcement related to a bargain article of the present day and a next service day. The synthetic speech sound generation system is activated when a ... | 09/07/1982 |
| 4348553 | Parallel pattern verifier with dynamic time warping A speech recognition system is disclosed which employs a network of elementary local decision modules for matching an observed time-varying speech pattern against all possible time warpings of the stored prototype patterns. For each elementary speech segm... | 09/07/1982 |
| 4348550 | Spoken word controlled automatic dialer A speech controlled dialing circuit identifies input utterances which may be a command word (mode select), repertory word (dialing name or number), or non-recognized ("Other"). Responsive to the identification of each occurring input utterance, a set of p... | 09/07/1982 |
| 4347403 | Electrical waveform synthesizer This electrical waveform synthesizer uses a digital feedback loop circuit which includes selectable inputs for multiplex or recirculation operation, and a shift register whose shift rate is controlled by an adjustable precision clock so as to accurately a... | 08/31/1982 |
| 4346262 | Speech analysis system In a formant speech analysis synthesis system, formant extraction to control a recursive digital all-pole filter encounters the problem that pole-pairs are not orderly arranged and that real poles may occur which are not representative of formants. The pr... | 08/24/1982 |
| 4343969 | Apparatus and method for articulatory speech recognition An apparatus and method are provided for the recognition of speech produced by various vocal pitches capable of recognition and classification of speech articulation at a real time rate. The apparatus and method assume that articulation of a given sound i... | 08/10/1982 |
| 4340779 | Interpreter intercommunication and public address system Simultaneous interpretation apparatus using matrix circuits whereby, even when an additional original language is used other than the specified original languages for the apparatus, simultaneous interpretation of that additional original language into the... | 07/20/1982 |
| 4340781 | Speech analysing device Computation of the partial correlation coefficients (PARCOR Ki) of a signal, using less cascaded hardware, is implemented by first deriving a sequence of auto-correlation coefficients (vj) which are then transformed into a sequence o... | 07/20/1982 |
| 4338490 | Speech synthesis method and device A speech synthesis device is adapted to provide an audible indication of numerical information through the utilization of a predetermined number of phonemes. Those phonemes are stored within a read only memory on a single large scale integrated circuit ch... | 07/06/1982 |
| 4336421 | Apparatus and method for recognizing spoken words A speech recognition technique is disclosed for recognizing words that are spoken at speeds that approach the speed of continuous speech. To avoid the cost of a rigorous approach wherein all possible words of stored vocabulary are correlated against each group... | 06/22/1982 |
| 4335276 | Apparatus for non-invasive measurement and display nasalization in human speech An apparatus for the acquisiton of a raw speech signal and the essentially simultaneous acquisition of a transform of the speech signal, wherein said transform covaries as a function of changes in one or more parameters in the speech signal and is indicat... | 06/15/1982 |
| 4335275 | Synchronous method and apparatus for speech synthesis circuit A speech synthesis circuit capable of being implemented in an integrated circuit is disclosed. The speech synthesis circuit has an input port for receiving frames of data consisting of speech coefficients, a memory for storing interpolated values of the s... | 06/15/1982 |
| 4335277 | Control interface system for use with a memory device executing variable length instructions A control interface system for use with a memory device executing variable length instructions and implementable utilizing integratable field effect semiconductor devices is disclosed. One example of such a system is a speed synthesis device controlled by... | 06/15/1982 |
| 4332979 | Electronic environmental acoustic simulator Systems analysis approach to measure and to reconstruct the sound energy flux distribution characteristic of "live" situations. The present invention relates to a method of measurement of acoustical fields and the functional relationships in audio systems... | 06/01/1982 |
| 4331837 | Speech/silence discriminator for speech interpolation The speech/silence discriminator is used on a telephone line to distinguish between periods of speech and periods of silence. A signal derived from the speech signal is, in the speech state compared to an adaptive threshold which is a fraction of the maxi... | 05/25/1982 |
| 4330689 | Multirate digital voice communication processor To provide alternative operation at 2.4 or 9.6 Kb/s bit rates, a multirate igital processor generates a data frame of 216 bits representing sync and voice encoded at both rates, with the 2.4 Kb/s embedded as a subset within the frame. Rate conversion is ma... | 05/18/1982 |
| 4328395 | Speech synthesis system with variable interpolation capability A speech synthesis system with a linear predictive filter. The linear predictive filter utilizes coded reflection coefficients to produce digital signals representative of human speech. A variable interpolation circuit within the linear predictive filter ... | 05/04/1982 |
| 4326101 | System for recognizing a word sequence by dynamic programming and by the use of a state transition diagram Operation of a continuous speech recognition system operable according to the dynamic programming technique, is controlled by a state transition diagram in compliance with which word sequences to be recognized by the system with reference to a predetermin... | 04/20/1982 |
| 4323732 | Speech synthesis system with alternative coded or uncoded parameter formats Speech parameter signals may be coded to consist of fewer bits for data reduction in memory. In this system both coded and uncoded signals are stored with an associated control signal which controls selection of corresponding direct or decoder circuit cou... | 04/06/1982 |
| 4322844 | Transmitter-receiver synchronizer A transmitter-receiver synchronizer is described for use in terminating T1 lines from a subscriber line switch at a central time division multiplexed switching system. A shared rate converter provides bidirectional data rate conversion between the 1.544 M... | 03/30/1982 |
| 4319084 | Multichannel digital speech synthesizer A multichannel digital speech synthesizer comprises a pulse generator storing periodic and aperiodic excitation signals to be processed in a lattice filter according to weighting parameters, such as gain and reflection coefficients, transmitted from a com... | 03/09/1982 |
| 4319082 | Adaptive prediction differential-PCM transmission method and circuit using filtering by sub-bands and spectral analysis Adaptive differential PCM system using both adaptive quantization and adaptive prediction. The adaptive prediction is carried out in adjacent frequency bands on as many signals as are obtained by weighting the quantized signal by coefficients obtained by ... | 03/09/1982 |
| 4319085 | Speech recognition apparatus and method In this speech recognition system the array formed by a timewise sequence of speech signal feature vectors includes digital data at each time slot representing both presence/absence and consistency of occurence.... | 03/09/1982 |
| 4314105 | Delta modulation method and system for signal compression This delta modulation system uses the differences between three successive samples of a waveform (the i-1, i, and i+1) such that the number of bits per digitization is reduced from four to two. The value vi of the ith sample is calculated by the equation ... | 02/02/1982 |
| 4314100 | Data detection circuit for a TASI system Disclosed is a circuit for determining whether an incoming signal is a speech signal or a data signal. In the preferred embodiment, means for separating the incoming signal into a low frequency component and a high frequency component are provided. The lo... | 02/02/1982 |
| 4314104 | Narrow band voice modulator system A method and system for reducing the actual bandwidth required for the transmission of signals which are inherently time and frequency division multiplexed, e.g. human speech signals, input signals of the above type lying within a first fractional bandwid... | 02/02/1982 |
| 4311877 | Method and means for improving the reliability of systems that transmit relatively wideband signals over two or more relatively narrowband transmission circuits A system for use with equipment designed for transmitting a relatively wideband signal over two or more relatively narrowband circuits so as to provide good overall system reliability even though the relability of the individual narrowband circuits is poo... | 01/19/1982 |
| 4310831 | Pulse width modulated, push/pull digital to analog converter A pulse width modulated digital-to-analog converter for utilization in low voltage, integrated circuit speech synthesis circuitry. A digitally programmable shift register is utilized to generate a pulse, which is generally related to the magnitude of a di... | 01/12/1982 |
| 4310721 | Half duplex integral vocoder modem system Disclosed is a system whereby in a transmit mode analog speech is sampled d converted digitally to 12 bits of accuracy and then fed into a fast Fourier transform (FFT) processor which analyzes the speech into spectral and pitch parameters. These parameter... | 01/12/1982 |
| 4304965 | Data converter for a speech synthesizer Data converter for a speech synthesizer system wherein encoded formant parameters as stored in a memory are decoded and transformed or converted to reflection coefficients in real time by means of a circuit implementing a Taylor series type approximation.... | 12/08/1981 |
| 4304964 | Variable frame length data converter for a speech synthesis circuit A speech synthesis circuit is provided with a variable frame length data converter and the speech synthesizer is preferably integrated on an integrated circuit chips. The variable frame length data converter reduces the amount of data required to synthesi... | 12/08/1981 |
