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Class 704/213 - Zero crossing


Subclass of Class 704 - Data processing: speech signal processing, linguistics, language translation, and audio compression/decompression
Definition: Subject matter wherein the zero crossings of the signal
No. of patents: 60
Last issue date: 11/29/2011


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NumberTitleIssue Date
8069039Sound signal processing apparatus and program
In a sound signal processing apparatus, a frame information generation section generates frame information of each frame of a sound signal. A storage stores the frame information generated by the frame information generation section. A first interval determination s...
11/29/2011
7555429Sound 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 signal is subjected to a waveform slicing process in frame units. The i...
06/30/2009
7363232Method 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 or more individual unit cycles. An audio speed conversion operation i...
04/22/2008
7277537Tone, 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 set of parameters from a plurality of duration periods of the signal, d...
10/02/2007
7253600Constant 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 detector senses the predetermined level crossing of the input signal. A ...
08/07/2007
7219060Speech synthesis using concatenation of speech waveforms
A high quality speech synthesizer in various embodiments concatenates speech waveforms referenced by a large speech database. Speech quality is further improved by speech unit selection and concatenation smoothing. ...
05/15/2007
7206740Efficient excitation quantization in noise feedback coding with general noise shaping
In a Noise Feedback Coding (NFC) system operable in a ZERO-STATE condition and a ZERO-INPUT condition, the NFC system including at least one filter having a filter memory, a method of updating the filter memory. The method comprises: (a) producing a ZERO-STATE contr...
04/17/2007
7184952Method and system for masking speech
A simple and efficient method for producing an obfuscated speech signal which may be used to mask a stream of speech, is disclosed. A speech signal representing the speech stream to be masked is obtained. The speech signal is then temporally partitioned into segment...
02/27/2007
7139380System and method for performing signaling-plan-specific call progress analysis
Call progress analysis is performed in a telephone system employing different in-band signaling plans are used. From address information for a call destination in a call initiation message, it is determined which type of in-band signaling plans is utilized by equipm...
11/21/2006
7120477Personal mobile computing device having antenna microphone and speech detection for improved speech recognition
A mobile computing device, adapted to be held in the palm of a user's hand, includes an antenna for transmission of information from the mobile computing device. A first microphone, adapted to convert audible speech from the user into speech signals, is positioned a...
10/10/2006
7110354Method of controlling 1+1bi-directional switching operation of asynchronous transfer mode switch
A system and method of controlling a bi-directional switching operation for a synchronous transfer mode (STM-1) signal transmission line of an asynchronous transfer mode (ATM) switch is disclosed. The system and method provide a rapid bi-directional switching...
09/19/2006
7065182Voice mail message repositioning device
A voice message repositioning process is provided for a voice message system that stores voice messages for a user of the system and provides feedback to the user of the progress of repositioning the playback of a voice message. A voice message is repositioned upon ...
06/20/2006
7020177Method 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 wireless devices using a waveform that includes a first sinusoidal signa...
03/28/2006
6993477Methods 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 producing a desired transformed output signal, and the transform is upd...
01/31/2006
6961397Symbol synchronizer for impulse noise channels
A symbol synchronizer comprises a distance metric computation module for computing a metric from received samples using a distance metric function within a symbol sampling period and based on a timing signal for each of the possible symbols in a constellation, a con...
11/01/2005
6931292Noise reduction method and apparatus
A method and system for reducing the undesirable noise in a communication signal is provided. Designed specifically to address the problem of telephone communications where the desired speech signal is contaminated by background noise, this invention employs digital...
08/16/2005
6832194Audio 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 such as a microprocessor or microcontroller. In one embodiment, the audi...
12/14/2004
6826525Method 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 consecutive segments of the same length with unfiltered discrete-time a...
11/30/2004
6480822Low 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 modes, an accurate representation of speech through CELP (co...
11/12/2002
6453282Method and device for detecting a transient in a discrete-time audiosignal
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 as to generate consecutive segments of the same length with unfiltered discret...
09/17/2002
6285979Phoneme 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 2.4 KHz and greater than about 3.4 KHz, respectively, to p...
09/04/2001
6272184Non-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 technique provides the capability for capturing and decod...
08/07/2001
6219635Instantaneous 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 in the original source process causes an original pitch pul...
04/17/2001
6205422Morphological 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 pure-speech signals by computing a novel Valley Percentage feature...
03/20/2001
6154721Method 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 calculating for each frame its energy and the zero-crossing rate...
11/28/2000
6108678Method 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 segment. Each segment undergoes all zeros detection, all ones...
08/22/2000
5970447Detection 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 well suited for detecting the termination of a telephone mess...
10/19/1999
5842172Method 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 block data plus a time shifted copy of the block data are sup...
11/24/1998
5809455Method 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 plural sub-blocks and the standard deviation, effective value o...
09/15/1998
5774862Computer 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 and can use electrical circuitry and programs for convertin...
06/30/1998
5774855Method 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. In this way, not only is processing time reduced, but the n...
06/30/1998
5749064Method 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) for generating feature vectors describing the zero crossi...
05/05/1998
5737725Method 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 preexisting voice files associated therewith. A plurality of pho...
04/07/1998
5708759Speech 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 called a frame, and waveform structural features are located ...
01/13/1998
5694517Signal 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 electric power judgement unit, a zero-crossing number judgeme...
12/02/1997
5675709System 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 feature quantity of the sound signal. Index data indicative of ...
10/07/1997
5661759Digital 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, for receiving and translating the FSK signal, a first zero...
08/26/1997
5659660Method 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 is encoded, based at least on an available data rate for t...
08/19/1997
5649055Voice 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, including the average signal level and the absolute value of...
07/15/1997
5426745Apparatus 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 speech, an image recognition unit for recognizing inputted image...
06/20/1995
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