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Inventor:
Morii; Toshiyuki
Address:
Kawasaki, JP
No. of patents:
34
Patents:












Patent Number Title Of Patent Date Issued
7925501 Speech coder using an orthogonal search and an orthogonal search method April 12, 2011
Speech is coded using an orthogonal search by calculating a search reference value. An adaptive codevector representing a pitch component is generated. A random codevector representing a random component is also generated. The orthogonal search further includes generating a synthetic
7729905 Speech coding apparatus and speech decoding apparatus each having a scalable configuration June 1, 2010
A speech coding apparatus includes a base layer coder that codes an input signal and generates first coded information. A base layer decoder decodes the first coded information and generates a first decoded signal. The base layer decoder also generates long term prediction information
7590527 Speech coder using an orthogonal search and an orthogonal search method September 15, 2009
A code excited linear prediction speech decoder includes an adaptive codebook configured to generate an adaptive code vector. The decoder also includes a random codebook configured to generate a random code vector. The decoder also includes a synthesis filter that receives a signal based
7587316 Noise canceller September 8, 2009
A noise canceller removes a noise component from an input speech signal. The noise canceller includes a noise cancellation coefficient adjuster that adjusts a noise cancellation coefficient to determine an amount of noise cancellation. A noise spectrum storage device stores an estimated
7577566 Method for encoding sound source of probabilistic code book August 18, 2009
A stochastic codebook associates a pulse position of a predetermined channel with a pulse position of another channel, searches for a pulse position by means of a predetermined algorithm, and outputs a code combining a found pulse position with a polarity code to an excitation vector
7546239 Speech coder and speech decoder June 9, 2009
A dispersed vector generator used for a speech encoder or a speech decoder includes a pulse vector provider that provides a pulse vector having a signed unit pulse on one element of a vector axis. A dispersion pattern determiner determines a dispersion pattern of a set of waveforms defin
7533016 Speech coder and speech decoder May 12, 2009
A target vector is coded by multi-stage vector quantization. A first stage of the coding of the target vector is performed using a first code vector stored in a first codebook. A scalar associated with a code of each first code vector is stored in an amplifier storing section. A third co
7499854 Speech coder and speech decoder March 3, 2009
A code excited linear prediction speech decoder is provided. An adaptive codebook generates an adaptive code vector. A random codebook generates a random code vector. A synthesis filter receives a signal based on the adaptive code vector and the random code vector, and performs linear
7392179 LPC vector quantization apparatus June 24, 2008
The present invention carries out pre-selection on many LPC codevectors stored in an LSF codebook 101 using a weighted Euclidean distortion as a measure and carries out a full-code selection on the LPC codevectors left after the pre-selection using an amount of distortion in a spectral s
7383176 Apparatus and method for speech coding June 3, 2008
CELP-based speech encoder that performs encoding by decomposing one frame into a plurality of subframes, includes an LPC synthesizer that obtains synthesized speech by filtering an adaptive excitation vector and a stochastic excitation vector stored in an adaptive codebook and in an
7373295 Speech coder and speech decoder May 13, 2008
An excitation vector generator is provided for generating an excitation vector. The excitation vector includes a pulse vector generator that has at least one channel for generating pulse vectors. A memory stores at least one type of dispersion pattern for each of the channels. A disp
7299174 Speech coding apparatus including enhancement layer performing long term prediction November 20, 2007
To implement scalable coding, a base layer coding section encodes an input signal to obtain base layer coded information, which is decoded by a base layer decoding section to obtain a base layer decoded signal and long term prediction information (pitch lag). An adding section inverts th
7289953 Apparatus and method for speech coding October 30, 2007
A speech encoder includes an LPC synthesizer that obtains synthesized speech by filtering an adaptive excitation vector and a stochastic excitation vector stored in an adaptive codebook and in a stochastic codebook using LPC coefficients obtained from input speech. A gain calculator
7289952 Excitation vector generator, speech coder and speech decoder October 30, 2007
A random code vector reading section and a random codebook of a conventional CELP type speech coder/decoder are respectively replaced with an oscillator for outputting different vector streams in accordance with values of input seeds, and a seed storage section for storing a pluralit
7177802 Pitch cycle search range setting apparatus and pitch cycle search apparatus February 13, 2007
An Adaptive Sound Source Vector Generator (ASSVG) 103 sets preceding and succeeding pitch cycles centered on an integral-accuracy pitch cycle T0 selected in the previous subframe as a range for searching for a fractional-accuracy pitch frequency, and extracts an adaptive sound source
7110943 Speech coding apparatus and speech decoding apparatus September 19, 2006
First codebook 61 and second codebook 62 respectively have two subcodebooks, and in respective codebooks, addition sections 66 and 67 obtain respective excitation vectors by adding sub-excitation vectors fetched from respective two subcodebooks. Addition section 68 obtains an excitat
7024356 Speech coder and speech decoder April 4, 2006
A dispersed vector generator used in an excitation vector generator for a speech coder/decoder is provided. The dispersed vector generator includes a pulse vector generating section that generates a pulse vector having a signed unit pulse on one element of a vector axis. The dispersed ve
6988065 Voice encoder and voice encoding method January 17, 2006
A vector code book (1094) where representative samples of vectors to be quantized are stored is created. Each vector is made up of three elements: an AC gain, a value corresponding the logarithm of an SC gain, and an adjustment coefficient of the prediction coefficient of SC. Coeffic
6947889 Excitation vector generator and a method for generating an excitation vector including a convolu September 20, 2005
A random code vector reading section and a random codebook of a conventional CELP type speech coder/decoder are respectively replaced with an oscillator for outputting different vector streams in accordance with values of input seeds, and a seed storage section for storing a plurality
6928406 Excitation vector generating apparatus and speech coding/decoding apparatus August 9, 2005
The total number of entries of an algebraic codebook is decreased by liming a random code vector generated from the algebraic codebook, and entries of a random codebook with a large number of pulses are assigned to a decreased portion. Further, the number of entries of the decreased port
6910008 Excitation vector generator, speech coder and speech decoder June 21, 2005
A random code vector reading section and a random codebook of a conventional CELP type speech coder/decoder are respectively replaced with an oscillator for outputting different vector streams in accordance with values of input seeds, and a seed storage section for storing a plurality
6799160 Noise canceller September 28, 2004
A random code vector reading section and a random codebook of a conventional CELP type speech coder/decoder are respectively replaced with an oscillator for outputting different vector streams in accordance with values of input seeds, and a seed storage section for storing a plurality
6772115 LSP quantizer August 3, 2004
A random code vector reading section and a random codebook of a conventional CELP type speech coder/decoder are respectively replaced with an oscillator for outputting different vector streams in accordance with values of input seeds, and a seed storage section for storing a plurality
6757650 Excitation vector generator, speech coder and speech decoder June 29, 2004
A random code vector reading section and a random codebook of a conventional CELP type speech coder/decoder are respectively replaced with an oscillator for outputting different vector streams in accordance with values of input seeds, and a seed storage section for storing a plurality
6687666 Voice encoding device, voice decoding device, recording medium for recording program for realizi February 3, 2004
A CELP type voice encoding device and a CELP type encoding device. Both the CELP type encoding device and the CELP type encoding device have a noise code book that can be searched in two modes in accordance with linear predictive analysis results, a pitch gain and a pitch cycle, all of w
6549885 Celp type voice encoding device and celp type voice encoding method April 15, 2003
A CELP type voice encoding device is disclosed. This device comprises quantizing means including a first gain quantizer for quantizing pitch gain and a second gain quantizer for performing quantization using a difference between an output value of said first gain quantizer and a pitc
6453288 Method and apparatus for producing component of excitation vector September 17, 2002
A random code vector reading section and a random codebook of a conventional CELP type speech coder/decoder are respectively replaced with an oscillator for outputting different vector streams in accordance with values of input seeds, and a seed storage section for storing a plurality
6421639 Apparatus and method for providing an excitation vector July 16, 2002
A random code vector reading section and a random codebook of a conventional CELP type speech coder/decoder are respectively replaced with an oscillator for outputting different vector streams in accordance with values of input seeds, and a seed storage section for storing a pluralitty
6421638 Voice encoding device, voice decoding device, recording medium for recording program for realizi July 16, 2002
The present invention intends to enhance a sound quality of a sound source generating portion in a CELP type voice encoding device and a CELP type voice decoding device. A pitch peak position of an adaptive code vector is obtained by a pitch peak position calculator 12, a window for emph
6415254 Sound encoder and sound decoder July 2, 2002
An excitation vector generator comprises a pulse vector generating section having N channels (N.gtoreq.1) for generating pulse vectors, a storing section for storing M (M.gtoreq.1)kinds of dispersion patterns every channel in accordance with N channels, a selecting section for selectivel
6345247 Excitation vector generator, speech coder and speech decoder February 5, 2002
A random code vector reading section and a random codebook of a conventional CELP type speech coder/decoder are respectively replaced with an oscillator for outputting different vector streams in accordance with values of input seeds, and a seed storage section for storing a plurality
6330535 Method for providing excitation vector December 11, 2001
A random code vector reading section and a random codebook of a conventional CELP type speech coder/decoder are respectively replaced with an oscillator for outputting different vector streams in accordance with values of input seeds, and a seed storage section for storing a plurality
6330534 Excitation vector generator, speech coder and speech decoder December 11, 2001
A random code vector reading section and a random codebook of a conventional CELP type speech coder/decoder are respectively replaced with an oscillator for outputting different vector streams in accordance with values of input seeds, and a seed storage section for storing a plurality
6226604 Voice encoder, voice decoder, recording medium on which program for realizing voice encoding/dec May 1, 2001
The present invention intends to enhance a sound quality of a sound source generating portion in a CELP type voice encoding device and a CELP type voice decoding device. A pitch peak position of an adaptive code vector is obtained by a pitch peak position calculator 12, a window for emph










 
 
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