Patent
Speech coding apparatus
Keiichi C,Kazunori C +1 more
- 09 Dec 1994
6
TL;DR: In this paper, a short term prediction parameter is extracted from an inputted speech signal and an optimum code vector is searched in a code book minimizing an evaluation function with an auto-correlation function of a speech source and an impulse response of a synthesis filter generated with the short term parameter to transmit an index of a decided code vector and a gain combined with a spectrum parameter and a pitch parameter.
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Abstract: A speech coding apparatus in which a short term prediction parameter is extracted from an inputted speech signal and an optimum code vector is searched in a code book minimizing an evaluation function with an auto-correlation function of a speech source and an impulse response of a synthesis filter generated with the short term parameter to transmit an index of a decided code vector and a gain combined with a spectrum parameter and a pitch parameter is constituted such that the auto-correlations are calculated with an approximation order set to a value of an Ismall being less than the length of the impulse response of the synthesis filter to redcuce the quantity of product and sum operations.
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Citations
Patent
Reducing memory requirements of a codebook vector search
Ananthapadmanabhan A. Kandhadai,Andrew P. Dejaco,Sharath Manjunath +2 more
- 06 Jun 2001
TL;DR: In this article, a subset of codevectors are selected based upon optimal pulse locations, wherein the subset of codeshapes form a subcodebook and instead of searching the entire codebook, only the entries of the sub codebook are searched.
24
Patent
Speech encoder capable of substantially increasing a codebook size without increasing the number of transmitted bits
Shin-Ichi Taumi,Kazunori Ozawa +1 more
- 26 Jul 1996
TL;DR: In this article, a gain codebook switching circuit is supplied with shortterm prediction gains from a short-term prediction gain calculator circuit and with mode information through an input terminal and compares the short-time prediction gains with a predetermined threshold value when the mode information indicates a predetermined mode.
10
Patent
A method for coding human speech and an apparatus for reproducing human speech so coded
Raymond N.J. Veldhuis,Paul Augustinus Peter Kaufholz +1 more
- 13 May 1997
TL;DR: In this paper, a plurality of speech segments are derived from speech received, and systematically stored in a data base for later concatenated readout for subsequent audio reproduction thereof, respectively.
3
Patent
Voice-coding-and-transmission system
Noriaki Mitsubishi Denki K.K. Kawano,Yushi Mitsubishi Denki K.K. Naito,Shigeaki Suzuki,Hisashi Yajima +3 more
- 27 Mar 1997
TL;DR: In this paper, a differential coding-and-transmission system was proposed to prevent the degradation of voice quality caused by a silent period transmission network and an ATM network without improving existing transmission networks such as a STM network.
2
Patent
Method and system for compensating speech signals
Periagaram K. Rajasekaran,Mustafa Kemal Sonmez +1 more
- 07 May 1997
TL;DR: In this article, a speech processing system and method which includes a codebook generator (26) for generating a reference vector quantization codebook which describes a reference environment and for generating at least one secondary vector quantisation codebook, which describes at least a secondary environment.
1
References
Improved CS-CELP speech coding in a noisy environment using a trained sparse conjugate codebook
Akitoshi Kataoka,S. Hosaka,J. Ikedo,Takehiro Moriya,S. Hayashi +4 more
- 09 May 1995
TL;DR: Subjective tests indicated that this codebook improves speech quality compared with the conventional trained codebook for noisy speech and the MOS showed that the quality of improved CS-CELP is equivalent to that of the 32-kbit/s ADPCM for clean speech.
15
Patent
A stochastic coder
Hammett Philip George
- 29 Jun 1988
TL;DR: In this article, a stochastic speech coder is described in which real speech is received and analysed to determine coefficients for a vocal tract filter, and broken down into frames of samples.
3
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