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7555429 Sound signal processing apparatus and degree of speech computation method  
Speech likeliness or a degree of speech is determined with a simple configuration or with a small amount of processing, and speech parts are separated from an input sound signal. The input sound...
7447279 Method and system for indicating zero-crossings of a signal in the presence of noise  
A device, method, and computer readable medium are used in connection with providing an indication of zero crossings corresponding to a signal. The signal ( 113 ) is received. Noise is removed from...
7363232 Method and system for enabling audio speed conversion  
The present invention provides a method and system for processing an audio signal. According to an exemplary method, an audio signal such as a digital voice signal is received and divided into one...
7277537 Tone, modulated tone, and saturated tone detection in a voice activity detection device  
In a voice activity detection (VAD) device a method for defining tone signals comprises defining a threshold for zero amplitude change, calculating a zero crossing rate of a signal, extracting a...
7253600 Constant slope ramp circuits for sample-data circuits  
A sample-data analog circuit includes a level-crossing detector. The level-crossing detector controls sampling switches to provide a precise sample of the output voltage when the level-crossing...
7020177 Method and apparatus to transfer information  
Briefly, in accordance with an embodiment of the invention, a method and apparatus to transfer information is provided, wherein the method includes transferring information between at least two...
6993477 Methods and apparatus for adaptive signal processing involving a Karhunen-Loève basis  
A signal processing device utilizes a stochastic approximation of a gradient descent algorithm for updating a transform. The signal processing device is configured to implement the transform for...
6832194 Audio recognition peripheral system  
The present invention includes a novel audio recognition peripheral system and method. The audio recognition peripheral system comprises an audio recognition peripheral a programmable processor...
6826525 Method and device for detecting a transient in a discrete-time audio signal  
A method for detecting a transient in a discrete-time audio signal is performed completely in the time domain and includes the step of segmenting the discrete-time audio signal so as to generate...
RE38269 Enhancement of speech coding in background noise for low-rate speech coder  
A speech coding system employs measurements of robust features of speech frames whose distribution are not strongly affected by noise/levels to make voicing decisions for input speech occurring in...
6480822 Low complexity random codebook structure  
A multi-rate speech codec supports a plurality of encoding bit rate modes by adaptively selecting encoding bit rate modes to match communication channel restrictions. In higher bit rate encoding...
6285979 Phoneme analyzer  
Phoneme analysis is carried out in real time by detecting a voiced component in the range of 200 Hz to 1 KHz and simultaneously detecting voiceless components having frequencies greater than about...
6272184 Non-coherent frequency shift keying detection scheme  
A non-coherent frequency shift keying detection scheme. The invention has been applied to the special case of capturing caller ID information when the voice-band modem is in the low power mode. The...
6219635 Instantaneous detection of human speech pitch pulses  
Pitch is tracked for a selected source process characterized by a pitch source having many harmonics followed by a bandpass filtering (e.g., human speech or other common processes). The filtering...
6205422 Morphological pure speech detection using valley percentage  
A human speech detection method detects pure-speech signals in an audio signal containing a mixture of pure-speech and non-speech or mixed-speech signals. The method accurately detects the...
6154721 Method and device for detecting voice activity  
The invention relates to a device intended for detecting in successive frames containing voice signals mixed with noise from various sources the periods of speech and those of only noise. By...
6108678 Method and apparatus to detect a floating point mantissa of all zeros or all ones  
A method to detect a normalized data field of all zeros or all ones includes receiving a control field and a data field, dividing the data field into segments, and performing detections on each...
5970447 Detection of tonal signals  
The system and method of the present invention uses a zero-crossing rate measurement in order to determine the initiation and/or termination of speech in an audio signal input. It is especially...
5842172 Method and apparatus for modifying the play time of digital audio tracks  
A method an apparatus for modifying the play time of digital audio tracks. For each data block of samples taken from a plurality of such blocks comprising an audio stream or track, the original...
5809455 Method and device for discriminating voiced and unvoiced sounds  
A method and a device for discriminating a voiced sound from an unvoiced sound or background noise in speech signals are disclosed. Each block or frame of input speech signals is divided into...
5774862 Computer communication system  
Musical intervals are used as codes to communicate preselected commands or inputs to a computer. The system can use human voice sounding notes (DO-RE, etc.) successively to establish the interval...
5774855 Method of speech synthesis by means of concentration and partial overlapping of waveforms  
A synthesis method in which that part of each interval of the original signal which contains the fundamental information is left unchanged, and only the remaining part of the interval is altered....
5749064 Method and system for time scale modification utilizing feature vectors about zero crossing points  
A method and system for implementing time scale modification wherein the method includes a Zero Crossing Module (22) for determining zero crossing points in the signal, a Feature Vector Module (24)...
5737725 Method and system for automatically generating new voice files corresponding to new text from a script  
A method and system for automatically generating at least one new voice file corresponding to at least one new text from a script incorporating a plurality of known text having corresponding...
5708759 Speech recognition using phoneme waveform parameters  
A method and apparatus for computer speech recognition based on time-domain phoneme waveform identification. In Mainwave-Ripple Model (MRM) analysis, the waveform is located in a short interval...
5694517 Signal discrimination circuit for determining the type of signal transmitted via a telephone network  
A signal discrimination circuit for discriminating between a voice signal and a voiceband data signal that is transmitted over a telephone network. The signal discrimination circuit includes an...
5675709 System for efficiently processing digital sound data in accordance with index data of feature quantities of the sound data  
A sound processing system is provided in which a sound signal is stored in a sound data storing unit in the form of digital sound data. The digital sound data is analyzed to obtain a physical...
5661759 Digital FSK receiver using double zero-crossing  
The present invention relates to a digital frequency shift keyed (FSK) signal receiver comprised of a band-pass filter having passbands corresponding to each modulation frequency of an FSK signal,...
5659660 Method of transmitting and/or storing digitized, data-reduced audio signals  
A method of encoding an audio signal for transmission and/or for storage includes changing a digitized audio signal based on a selected signal changing criteria. The changed digitized audio signal...
5649055 Voice activity detector for speech signals in variable background noise  
A voice activity detector (VAD) which determines whether received voice signal samples contain speech by deriving parameters measuring short term time domain characteristics of the input signal,...
5426745 Apparatus including a pair of neural networks having disparate functions cooperating to perform instruction recognition  
There is provided a customized personal terminal device capable of operating in response to input data peculiar to the operator, comprising a speech recognition unit for recognizing inputted...
5357595 Sound recording and reproducing apparatus for detecting and compensating for recorded periods of silence during replay  
A sound recording and reproducing apparatus includes a semiconductor memory, an acoustic signal writing unit for writing a digital acoustic signal to the semiconductor memory, and a read out unit...
5295223 Voice/voice band data discrimination apparatus  
An apparatus for discriminating voice data so as to create statistical data and for discriminating voice/voice band data in digital speech interpolation and digital circuit multiplication...
5159638 Speech detector with improved line-fault immunity  
A speech detector has an intensity detector that indicates whether the intensity of a PCM signal exceeds a first threshold, and a normal-zero-crossing-count detector that indicates whether the...
5157727 Process for digitizing speech  
A process is disclosed for digitizing (more precisely encoding) speech for the purpose of reducing information rate and bandwidth relative to that of prior art means to digitize speech, while...
5131042 Music tone pitch shift apparatus  
A music tone pitch shift apparatus which converts an original audio signal into digital data by way of pulse code modulation (PCM), shifting the pitch, and converting the pitch shifted digital data...
5109418 Method and an arrangement for the segmentation of speech  
In a method of and an apparatus for the segmentation of speech, an acoustic speech signal is converted into N signals S i (f), each signal pertaining to a time interval i of N successive time...
5007000 Classification of audio signals on a telephone line  
This telephone solicitation system provides automatic dialing and call-progress detection. Audio signals on the line are analyzed to recognize network operation tones, noise bursts, and speech. A...
4912765 Voice band data rate detector  
An apparatus for detecting the modulation rate of voice-band data signals. The detector determines the level occupancy L p , the partial entropy E p , and the zero-crossing count N zc for the...
4899386 Device for deciding pole-zero parameters approximating spectrum of an input signal  
For use in deciding optimum pole and zero parameters for an input signal with reference to an input cepstrum of the signal, candidate pole and zero parameters are stored in advance in a table....
4860355 Method of and device for speech signal coding and decoding by parameter extraction and vector quantization techniques  
This method provides a filtering of blocks of digital samples of speech signal by a linear-prediction inverse filter followed by a shaping filter, whose coefficients are chosen out of a codebook of...
4764963 Speech pattern compression arrangement utilizing speech event identification  
There are disclosed speech encoding methods and arrangements, including among others a speech synthesizer that reproduces speech from the encoded speech signals. These methods and arrangements...
4706293 Circuitry for characterizing speech for tamper protected recording  
Circuitry usable in a tamper protected recording system for characterizing audio signals at the time of recording including a filter for selecting a portion of the audio signal, a zero crossing...
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...
4626827 Method and system for data compression by variable frequency sampling  
A data compression system comprises an analog-to-digital converter for quantizing the analog signal at a first sampling frequency into a series of digital samples and a memory for storing the...
4568912 Method and system for translating digital signal sampled at variable frequency  
In a data compression system, a digital signal comprising a series of digital samples and a sampling datum associated with each digital sample is received by a decoder. The sampling datum indicates...
4545065 Extrema coding signal processing method and apparatus  
High-frequency broadband noise (at frequencies above the lower-frequency analog information signal) is actually required for this system which transforms the information-plus-noise signal (FIG. 2a)...
RE31614 Decreasing time duration of recorded speech  
Disclosed is apparatus for and a method of decreasing the time duration of playback of recorded speech without distortion. Speech recorded at a normal rate is played back at a higher rate using two...
4443857 Process for detecting the melody frequency in a speech signal and a device for implementing same  
The process uses a set of data characteristic of the speech signal, supplied by processing circuits: measurements of the time intervals between zero crossovers and measurements of the energy in the...
4382160 Methods and apparatus for encoding and constructing signals  
A speech waveform is encoded to reduce storage capacity or transmission bandwidth requirements. The invention encodes two features of the time waveform, for example (1) duration of half-cycle, and...
Matches 1 - 50 out of 65 1 2 >