Patents Examined by E. S. Matt Kemeny
  • Patent number: 4701953
    Abstract: 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 intensity of a broader spectral portion of the input signal than the bandpass filtered spectral portion), and a divider (for compressing the bandpass filtered spectral portion using a variable gain having a preselected functional relationship to the spectrally weighted intensity estimate). The signal compression system preserves cross-channel information.
    Type: Grant
    Filed: July 24, 1984
    Date of Patent: October 20, 1987
    Assignee: The Regents of the University of California
    Inventor: Mark W. White
  • Patent number: 4701954
    Abstract: A multipulse-code approximation of of one frame of a predictive residual signal may lose the frame-to-frame redundancy. Accordingly, pitch redundancy removal during the iterative process of forming the multipulse sequence, rather than frame-to-frame code comparison, provides reduction of excitation signal bit rate, substantially independent of voice pitch. A speech pattern predictive coding arrangement includes forming a prescribed format multipulse excitation signal for each successive time frame of the pattern. The multipulse excitation signal corresponds to the frame predictive residual. The redundancy in the multipulse excitation signal is reduced by forming a signal representative of the similarities between the current frame speech pattern and the speech pattern of preceding frames and removing such similarities from the multipulse excitation signal. Advantageously, the bit rate of the multipulse excitation signal is reduced and the excitation signal is rendered substantially independent of voice pitch.
    Type: Grant
    Filed: March 16, 1984
    Date of Patent: October 20, 1987
    Assignee: American Telephone and Telegraph Company, AT&T Bell Laboratories
    Inventor: Bishnu S. Atal
  • Patent number: 4700390
    Abstract: To enhance low and high frequency components in a sound signal, low frequency components are used to generate new yet lower frequencies (subharmonics), and high frequency components are used to generate new yet higher frequencies (harmonics), the new frequencies added to the original signal thereby increasing the original signal bandwidth.
    Type: Grant
    Filed: March 12, 1984
    Date of Patent: October 13, 1987
    Inventor: Kenji Machida
  • Patent number: 4700393
    Abstract: In a speech synthesizer, speech speed is selectable by a switch which selects the number of repetitions of a basic waveform or equivalent parameters thereof.
    Type: Grant
    Filed: July 14, 1982
    Date of Patent: October 13, 1987
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Sigeaki Masuzawa, Hideo Yoshida, Mituhiro Saiji
  • Patent number: 4700392
    Abstract: 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 second threshold signal which is proportional to a hangover time signal. The first and second threshold signals are used to form up to six threshold values.
    Type: Grant
    Filed: August 24, 1984
    Date of Patent: October 13, 1987
    Assignee: NEC Corporation
    Inventors: Tadaharu Kato, Takao Nishitani
  • Patent number: 4700394
    Abstract: 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 samples of the disturbed speech signal, which short time mean values are a measure of the average power of approximately 100 ms long sections of the disturbed speech signals. The sequence of these short-time mean values is then smoothed by linear filtration or by means of a median filter. In parallel with the smoothing operation an estimate for the noise signal power averaged over a few seconds is taken from the sequence of short-time mean values. If the smoothed short-time mean value is once or several times less than a threshold which is proportional to the above-mentioned estimate, then it is decided that there is a speech pause.
    Type: Grant
    Filed: November 17, 1983
    Date of Patent: October 13, 1987
    Assignee: U.S. Philips Corporation
    Inventors: Bernd Selbach, Peter Vary
  • Patent number: 4700322
    Abstract: Video display of stored text is accompanied by associated speech from a speech synthesizer using coded sounds and intonation. A central processor controls selection of text and speech. Speech is selectable in one of a plurality of prestored languages coded in frequency and duration data.
    Type: Grant
    Filed: May 25, 1984
    Date of Patent: October 13, 1987
    Assignee: Texas Instruments Incorporated
    Inventors: Gerard V. Benbassat, Daniel Serain
  • Patent number: 4700391
    Abstract: Digital processing of speech signals for compression/expansion pitch change is provided by writing and reading a ROM at different rates and controlling the discard/repeat segments of memory to be integral multiples of the pitch period. The rear pointer jumps a portion of the memory to either skip a portion (in compression) or retrace a portion (in expansion) of the recorded information. The read pointer jumps so as to avoid crossing the write pointer (thereby avoiding reading old recorded information). The jump occurs when a predetermined spacing or condition is reached between read and write pointers.
    Type: Grant
    Filed: December 1, 1986
    Date of Patent: October 13, 1987
    Assignee: The Variable Speech Control Company ("VSC")
    Inventors: George F. Leslie, Jr., Kent W. MacKay
  • Patent number: 4698776
    Abstract: There is provided an apparatus which automatically records and reproduces. The digital signal based on the acoustic signal is stored in memory means due to the operation of write control means in response to the recording instruction. When the recording is not instructed, the digital signal stored is read out due to the operation of readout control means, and the acoustic signal is reproduced from this digital signal.
    Type: Grant
    Filed: May 23, 1984
    Date of Patent: October 6, 1987
    Assignee: Kabushiki Kaisha Kenwood
    Inventor: Izumi Shibata
  • Patent number: 4696040
    Abstract: Energy normalization in speech synthesis systems is achieved by a look-ahead adaptive normalization procedure, wherein energy is adaptively tracked, and the adaptive energy-tracking value is used to normalize a much earlier frame's energy value.
    Type: Grant
    Filed: October 13, 1983
    Date of Patent: September 22, 1987
    Assignee: Texas Instruments Incorporated
    Inventors: George R. Doddington, Panos E. Papamichalis
  • Patent number: 4695962
    Abstract: The present invention provides a conversion between a speech mode in which each word is clearly enunciated as if spoken in isolation and in which a phrase is spoken as a whole taking into account the influence of adjacent words. In the phrase mode, word ending final phonological linguistic units are replaced with their corresponding internal versions, and short strong vowels are substituted for the corresponding long strong vowels except at the word ends. In the word mode, a word final pronunciation is given when a corresponding internal phonological linguistic unit occurs at a word end, and short strong vowels are replaced by the corresponding long strong vowel when the short strong vowel occurs at the end of a word or prior to a set of voiced consonants. In either mode, a substitution may be made for the pronunciation of frequently used words. This invention is most useful in speaking electronic learning aids which permit word or phrase speech synthesis from the same data.
    Type: Grant
    Filed: November 3, 1983
    Date of Patent: September 22, 1987
    Assignee: Texas Instruments Incorporated
    Inventor: Kathleen M. Goudie
  • Patent number: 4696039
    Abstract: Silence suppression in speech synthesis systems is achieved by detecting and processing only segments of voice activity. A segment is classified as "speech" if the energy of the signal is greater than an adaptively adjusted threshold. The adaptively adjusted threshold is preferably defined as the maximum of scaled values of two separate envelope parameters, which both track the variation in energy over the sequence of frames of speech data. One contour is a slow-rising fast-falling value, which is updated only during unvoiced speech frames, and therefore track a lower envelope of the energy contour. This parameter in effect tracks an ambiant noise level. The other parameter is a fast-rising slow-falling parameter, which is updated only during voiced speech frames, and thus tracks an upper envelope of the energy contour. (This in effect tracks the average speech level.) A nonsilent energy tracker and a silent energy tracker adjust corresponding energy values representing the energy contours.
    Type: Grant
    Filed: October 13, 1983
    Date of Patent: September 22, 1987
    Assignee: Texas Instruments Incorporated
    Inventor: George R. Doddington
  • Patent number: 4696038
    Abstract: This voice messaging system provides an LPC analyzer in combination with a pitch extractor wherein LPC parameters and a residual signal organized in a sequence of speech data frames are provided by the LPC analyzer as an output representative of an analog speech signal. The pitch extractor is operably associated with the LPC analyzer and produces a plurality of pitch candidates for each of the speech data frames in the sequence thereof. Dynamic programming is performed on the plurality of pitch candidates for each speech data frame and also with respect to a voiced/unvoiced decision of the speech data for each frame by tracking both pitch and voicing from frame to frame to provide an optimal pitch value and also an optimal voicing decision.
    Type: Grant
    Filed: April 13, 1983
    Date of Patent: September 22, 1987
    Assignee: Texas Instruments Incorporated
    Inventors: George R. Doddington, Bruce G. Secrest
  • Patent number: 4694493
    Abstract: A voice verification system in which multiple generic reference patterns are obtained by speaking the password in a number of different ways and in which a speaker specific reference pattern is generated by the speaker undergoing registration. A subset of the generic reference patterns are selected having the greatest similarity to the registered speaker's pattern. During verification, the speaker's identity is verified if the dissimilarity between the input pattern and the registered speakers reference pattern is both less than any dissimilarity between the input pattern and the selected generic reference patterns and also less than a threshold value.
    Type: Grant
    Filed: March 20, 1984
    Date of Patent: September 15, 1987
    Assignee: NEC Corporation
    Inventor: Hiroaki Sakoe
  • Patent number: 4692941
    Abstract: A high-quality, real-time text-to-speech synthesizer system handles an unlimited vocabulary with a minimum of hardware by using a microcomputer-software-compatible time domain methodology which requires a minimum of memory and computational power. The system first compares test words to an exception dictionary. If the word is not found therein, the system applies standard pronunciation rules to the text word. In either instance, the text word is converted to a phoneme sequence. By the use of look-up tables addressed by pointers contained in a phoneme-and-transition matrix, the synthesizer translates the sequence of phonemes and transitions therebetween into sequences of small speech segments capable of being expressed in terms of repetitions of variable-length portions of short digitally stored waveforms.
    Type: Grant
    Filed: April 10, 1984
    Date of Patent: September 8, 1987
    Assignee: First Byte
    Inventors: Richard P. Jacks, Richard P. Sprague
  • Patent number: 4688256
    Abstract: 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 sound) is detected.
    Type: Grant
    Filed: December 22, 1983
    Date of Patent: August 18, 1987
    Assignee: NEC Corporation
    Inventor: Satoshi Yasunaga
  • Patent number: 4685135
    Abstract: A text-to-speech synthesis system receives digital code representative of characters from a local or remote source, and converts those character codes into speech. A set of allophone rules is contained in a memory and each incoming character set is matched with the proper character set to describe the sound of that particular character set. A microcontroller is dedicated to the comparison procedure which provides allophonic code when a match is made. The allophonic code is provided to a speech producing system which has a system microcontroller for controlling the retrieval, from a read-only memory, of digital signals representative of the individual allophone parameters. The addresses at which such allophone parameters are located are directly related to the allophonic code. A dedicated microcontroller concatenates the digital signals representative of the allophone parameters, including code indicating stress and intonation patterns for the allophones.
    Type: Grant
    Filed: March 5, 1981
    Date of Patent: August 4, 1987
    Assignee: Texas Instruments Incorporated
    Inventors: Kun-Shan Lin, Kathleen M. Goudie, Gene A. Frantz
  • Patent number: 4682361
    Abstract: 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 signal are determined from the short-time Fourier coefficients of the disturbed speech signal. The sequential short-time mean values are then smoothed by a linear digital filter or a median filter. An estimate of the noise signal power averaged over a few seconds is also recovered from the sequence of short-time mean values. A speech pause is signified when the smoothed short-time mean value (output of GL) more than once falls to a threshold which is proportional to the estimated noise power (output of PA).
    Type: Grant
    Filed: November 17, 1983
    Date of Patent: July 21, 1987
    Assignee: U.S. Philips Corporation
    Inventors: Bernd Selbach, Peter Vary
  • Patent number: 4680730
    Abstract: In a storage control apparatus only vector elements indicated as write data by a corresponding mask information among the vector elements stored in a storage device are stored to the pertinent memory locations of a desired vector register in the vector processor based on the mask information which indicates whether or not the write operation is required (for example, "1" indicates that the write operation is necessary and "0" indicates that the write operation is unnecessary). When the mask information indicates that the write operation is not required, the storage control apparatus controls operations to prevent the memory bank of the main storage from being set to the busy state, thereby eliminating the memory bank conflict which should not take place in accordance with the intrinsic system characteristics.
    Type: Grant
    Filed: July 9, 1984
    Date of Patent: July 14, 1987
    Assignee: Hitachi, Ltd.
    Inventors: Koichiro Omoda, Shigeo Nagashima
  • Patent number: 4680797
    Abstract: A novel form of waveform coding is used, designated a "Critical Point Coder" (CPC). It operates by transmitting only those points in a waveform which are significant for defining its overall structure. The receiver reconstructs the missing points in the waveform using some sort of approximating interpolation. The Critical Point Coder uses a new approach to waveform coding. Rather than transmitting information about each sample as other waveform coders, the Critical Point Coder transmits information for only samples deemed critical to high quality reconstruction. The four major functions performed by the Critical Point Coder are (1) detecting which samples are critical, called critical points e.g.
    Type: Grant
    Filed: June 26, 1984
    Date of Patent: July 14, 1987
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventor: George Benke