Quotables
"I hate what they've done to my child...I would never let my own children watch it. "
Vladimir Zworykin, television pioneer ; Talking about an invention in which he played a critical role.
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| Number | Title | Issue Date |
| 5073940 | Method for protecting multi-pulse coders from fading and random pattern bit errors A low-overhead method of protecting multi-pulse speech coders from the effects of severe random or fading pattern bit errors combines a standard error correcting code (convolutional rate 1/2 coding and Viterbi trellis decoding) for protection in random er... | 12/17/1991 |
| 5063597 | Muting circuit in a digital audio system A muting circuit in a digital audio system having a digital signal processor, a first latch, a second latch, a comparator for comparing data in the first and second latches, an address encoder, a counter, a memory, a divider, a multiplier and a switching ... | 11/05/1991 |
| 5054025 | Method for eliminating errors in block parameters Some signal coding techniques involve quantizing the signal samples using a signal derived parameter to set the quantizer step. This parameter is then used in the decoding process to synthesize the original signal back to its analog form. Any error affect... | 10/01/1991 |
| 5054075 | Subband decoding method and apparatus An subband coding system encoder is provided for improving the quality of a reconstructed speech signal. Briefly, the improved subband coding system encoder includes means for improving the selection of the waveform/noise fill gain factor. The improved se... | 10/01/1991 |
| 5042069 | Methods and apparatus for reconstructing non-quantized adaptively transformed voice signals Apparatus and method for reconstructing non-quantized adaptively transformed voice signals are shown to include noise shaping wherein the spectral envelope is scaled prior to generating bit allocation and energy substitution which is achieved after dequan... | 08/20/1991 |
| 5036540 | Speech operated noise attenuation device A speech operated noise attenuation device (SONAD) includes circuitry to measure the noise level in an audio channel. The output of the noise measurement circuitry provides a control signal to an audio attenuator which varies the intersyllable attenuation... | 07/30/1991 |
| 5020108 | Audible display of electrical signal characteristics Various selected characteristics of digital (or analog) signals in an electrical circuit are converted into audible signals and transmitted as a sound pattern(s) through a speaker or headphones to a user. Such selected signal characteristics include pulse... | 05/28/1991 |
| 5012519 | Noise reduction system Noise in a speech-plus-noise input signal is suppressed by splitting the input signal into spectral channels and decreasing the gain in the each channel which has a low signal-to-noise ratio (SNR). A voice operated switch (VOX) acts to detect noise-only i... | 04/30/1991 |
| 5007094 | Multipulse excited pole-zero filtering approach for noise reduction A pulse train of primary pulses is estimated from an inverse LPC analysis of a frame of voiced speech. From this estimated pulse train a pole-zero filter is estimated. The estimated pulse train is used to excite the estimated pole-zero filter to produce a... | 04/09/1991 |
| 4965830 | Apparatus for estimating distortion resulting from compressing digital data Apparatus for analyzing distortion levels of samples which occur in data compression systems of the type that may be integrated into a data compression system or used as a stand alone analyzer. The apparatus includes a processor that is coupled to the dat... | 10/23/1990 |
| 4933675 | Audio digital/analog encoding and decoding Apparatus and an associated method are described for encoding an analog signal to a digital representation thereof and then decoding the same to reconstruct the original analog signal with reduced quantization noise and error. The analog signal is first a... | 06/12/1990 |
| 4924480 | Codecs with suppression of multiple encoding/decodings across a connection In a private telecommunications network, a plurality of digital PBXs are interconnected via pairs of codecs. The codecs of each pair, or "tandem", are each operative to encode 64 kilobit/second (kbps) mu-law speech so as to compress it to 16 kbps speech f... | 05/08/1990 |
| 4918729 | Voice signal encoding and decoding apparatus and method A voice signal encoding and decoding apparatus and method which attenuates rapidly a voice signal when there occurs an error in transmission by giving increased robustness to the transmission error. It comprises an encoding section which includes a predic... | 04/17/1990 |
| 4896362 | System for subband coding of a digital audio signal A system for subband coding of a digital audio signal x(k) includes in the coder (1) a filter bank (3) for splitting the audio signal band, with sampling rate reduction, into subbands (p=1, . . . P) of approximately critical bandwidth and in the decoder (... | 01/23/1990 |
| 4862168 | Audio digital/analog encoding and decoding Apparatus and an associated method are described for encoding an analog signal to a digital representation thereof and then decoding the same to reconstruct the original analog signal with reduced quantization noise and error. The analog signal is first a... | 08/29/1989 |
| 4839923 | Method and apparatus for time companding an analog signal A method and apparatus to compand an analog message to afford a two-to-one improvement in spectral efficiency, while contemporaneously minimizing distortion in the received signal. According to the invention, an analog message such as a voice message is d... | 06/13/1989 |
| 4821324 | Low bit-rate pattern encoding and decoding capable of reducing an information transmission rate In an encoder operable in response to a discrete pattern signal divisible into a sequence of segments to produce an output code sequence, each segment is produced during a frame and specified by representative excitation signals extracted from each segmen... | 04/11/1989 |
| 4811404 | Noise suppression system An improved noise suppression system (800) is disclosed which performs speech quality enhancement upon the speech-plus-noise signal available at the input (205) to generate a clean speech signal at the output (265) by spectral gain modification. The impro... | 03/07/1989 |
| 4811396 | Speech coding system A speech signal coding system comprises a prediction filter coupled with an output of a quantizer for prediction of a signal. A subtractor provides the difference between an input signal and an output of the prediction filter. A quantizer quantizes the re... | 03/07/1989 |
| 4791670 | Method of and device for speech signal coding and decoding by vector quantization techniques This method provides a filtering of digital samples of speech signal by a linear-prediction inverse filter, whose coefficients are chosen out of a codebook of quantized filter coefficient vectors, obtaining a residual signal subdivided into vectors. The w... | 12/13/1988 |
| 4747143 | Speech enhancement system having dynamic gain control An arrangement for a speech enhancement processor which maintains the processed speech at a constant level regardless of large changes in the associated noise level. The composite speech and noise signal is applied to a first AGC circuit and then to a spe... | 05/24/1988 |
| 4741037 | System for the transmission of speech through a disturbed transmission path When a communication channel is noisy, speech signals at the transmitter are converted by a speech recognition unit to data-reduced code words which are then transmitted repeatedly as redundant data so as to fill the available bandwidth. At the receiver, ... | 04/26/1988 |
| 4701953 | Signal compression system A signal compression system includes a plurality of channels. A plurality of these channels include a bandpass filter (for filtering out all but a portion of an input signal), an intensity detector (for deriving a spectrally weighted estimate of the inten... | 10/20/1987 |
| 4652857 | Method and apparatus for transmitting wide-bandwidth frequency signals from mines and other power restricted environments A method and apparatus for transmitting and receiving messages by electromagnetic induction in a power restricted environment is disclosed in which the message bandwidth is narrowed prior to transmission and restored to its original breadth upon reception... | 03/24/1987 |
| 4630305 | Automatic gain selector for a noise suppression system An automatic gain selector is disclosed for use with a noise suppression system which performs speech quality enhancement upon a noisy speech signal available at the input to generate a noise-suppressed speech signal at the output by spectral gain modific... | 12/16/1986 |
| 4628529 | Noise suppression system An improved noise suppression system (400) is disclosed which performs speech quality enhancement upon speech-plus-noise signal available at the input (205) to generate a clean speech signal at the output (265) by spectral gain modification. The noise sup... | 12/09/1986 |
| 4622690 | Audio frequency multiplication device A signal processing device for frequency multiplication of an analog signal by an adjustable multiplication factor. The input analog signal is digitized using a delta modulator and read into a random access memory at a first clock rate. The data is read o... | 11/11/1986 |
| 4617676 | Predictive communication system filtering arrangement A digital communication system includes a predictive decoder that is operative to convert received digital codes into a predictively decoded signal, e.g., speech signal, and to generate a set of predictive parameter signals and a signal representative of ... | 10/14/1986 |
| 4609878 | Noise reduction system A noise reduction system including a signal path (34) between an input terminal (12) and an output terminal (36), a voltage control amplifier (38) and a control path (40) between the input terminal and the voltage control amplifier is disclosed. A nonline... | 09/02/1986 |
| 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 |
| 4499594 | Digital to analog converter In this pcm digital-to-analog converter, a probability value (soft decision), rather than the conventional one/zero value (hard decision), is given each sampled input of signal-plus-noise as a function of signal-to-noise ratio, thereby reducing the mean s... | 02/12/1985 |
| 4493091 | Analog and digital signal apparatus In order to reduce the effect of modulation of the quantizing error (noise) by the signal in an adaptive digital audio system and to increase the dynamic range of the system, the adaptive analog to digital converter is preceded by a frequency dependent ne... | 01/08/1985 |
| 4468804 | Speech enhancement techniques A method for processing a voiced speech waveform when the periods and amplitudes thereof may be non-uniform so that the intelligibility thereof is adversely affected. In accordance with such method successive portions of the speech waveform are processed ... | 08/28/1984 |
| 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 |
| 4410986 | Error and status detection circuit for a digital regenerator using quantized feedback A digital regenerator line includes in each station a status and error detection arrangement having an error detection circuit (64) responsive to a filtered composite output signal (101) from a low-pass filtered output from a digital regenerator (30) usin... | 10/18/1983 |
| 4379948 | Method of and arrangement for deriving characteristic values from a sound signal In order to reduce the information contents of a sound signal, for example a speech signal, the sound signal is divided into adjacent frequency ranges and the signals then obtained are consecutively integrated over short time intervals to short-time-spect... | 04/12/1983 |
| 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 |
| 4286116 | Device for the processing of voice signals A processing device transmits speech signals of constant amplitude during periods of voice activity and interrupts transmission outside these periods, so that noise is not transmitted. To this end the processing device comprises an amplitude-compressing d... | 08/25/1981 |
| 4223181 | Method and apparatus for processing signals Auto-adaptive filtering devices for analysis and treatment or processing of A.F. signals. These devices are characterized in that they include filtering means splitting the applied signals into two parts or channels having complementary spectra, a first c... | 09/16/1980 |
| 4133976 | Predictive speech signal coding with reduced noise effects A predictive speech signal processor features an adaptive filter in a feedback network around the quantizer. The adaptive filter essentially combines the quantizing error signal, the formant related prediction parameter signals and the difference signal t... | 01/09/1979 |
