USO0RE36721E
United States Patent
[19]
SPEECH CODING AND DECODING APPARATUS
OTHER PUBLICATIONS ICASSP ’89, GlasgoW, 23—26 May 1989, v1 pp. 148—151,
[75] Inventors: MasamiAkamine, Yokosuka; Kimio
IEEE’ NY Akamine et a1 ARMA model based Speech
M. ki K k. b th f J ‘Se ’ awasa 1’ ° ° apan
Coding at SKB/S . EUROCON ’88, Stockholm, 13—17 Jun., 1988, pp. 24—27,
[73] Assignee: Kabushiki Kaisha Toshiba, Kawasaki, Japan
IEEE’ N.Y Lever et a1; RPCELP: A hlgh quahty and,,1°W
complexity scheme for narrow band coding of speech .
ICASSP ’85, Tampa, Fla, 26—29 Mar. 85, V4, pp. 1429—1432 IEEE NY, Wake et al, “A multple LPC speech Codec using DSP’Q
[21] Appl. No.: 08/561,751 -
May 30, 2000
[45] Reissued Date of Patent:
Akamine et al. [54]
Re. 36,721
Patent Number:
[11] E
_
ICDSC—7 (7th Intl. Conf. on Digital Satellite Comm),
[22] Med‘
Nov‘ 22’ 1995
Munich, 12—16 May 86 pp. 785—790, VDE—Verlag GmbH, Berlin, DE. Araseki et al, “A high quality multi pulse LPC
Reissue of Related US‘ Patent Documents
Coder for Speech trans. beloW 16 KBPS”.
[64]
5,265,167 NOV‘ 23’ 1993
(List continued on next page.) Primary Examiner—Kee M. Tung
08/013,551
Attorney, Agent, or Firm—Oblon, Spivak, McClelland,
NOV- 19’ 1992
Maier & Neustadt, P. C.
Patent No.: Issued:
APPL N05 U S AFllidi _ .
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ABSTRACT -
-
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A speech slgnal 1.5 man to an
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slgnal generanng
section, a prediction ?lter and a prediction parameter cal
culator. The prediction parameter calculator calculates a
predetermined number of prediction parameters (LPC Apr. 25, 1989 Feb. 5,
[51] [52]
[JP]
Japan .................................. .. 1-103398 Japan .................................... ..
parameter or re?ection coef?cient) by an autocorrela?on method or Covariance method, and Supplies the acquired
Int. c1.7 ......................... .. G10L 9/00 US. Cl. ........................ .. 704/220; 704/219; 704/223; _
Prediction parameters to a prediction parameter 999199 The Codes 9f the Prediction Parameters are Sent to a decoder and a multiplexer. The decoder sends decoded values of the
704/262’ 704/264
_
[58] Fleld of seggghz 329312527’ / ' 216' 22’3 '22’6 28_ 58’ 262/ 264; _
’
_
’
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co d es 0 fth e pre d'1c t'ion parame t ers t o
th e pre d'1c t'ion ?lter and
the excitation signal generating section. The prediction ?lter calculates a prediction residual signal, Which is the differ ence betWeen the input speech signal and the decoded
prediction parameter, and sends it to the excitation signal
[56]
References Cited
generating section. The excitation signal generating section
US PATENT DOCUMENTS
calculates the pulse interval and amplitude for each of a predetermined number of subframes based on the input speech signal, the prediction residual signal and the quan
477367428
4/1988 Deprettere et a1‘
4 811 396
3/1989 Yatsuzuka _______ __
n 395/273 395/239
t1Zed value of the prediction parameter, and sends them to
4864621
9/1989 Boyd ___________ __
395/232
the multiplexer. The multiplexer combines these codes and the codes of the prediction parameters, and send the results
4,924,508
5/1990 Crepy et a1, ,,
__ 395/228
4,932,061
6/1990 Kroon et al. .... ..
.. 395/232
as an output signal of a coding apparatus to a transmission
4,944,013
7/1990 Gouvianakis et al.
.. 395/228
path or the like'
4,964,169
10/1990
Ono .................... ..
395/227
5,060,268 10/1991 Asakawa et al. .................... .. 395/228
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Re. 36,721 Page 2
OTHER PUBLICATIONS
IEEE, ICASSP ’85, pp. 937—940, “CELP—high quality speech a very low bid rates”, Atal et a1, 1985.
IEEE Trans. ASSP—34, pp. 1034—1063, “RPE—A novel Approach to effective and Ef?cient Multipulse Coding of Speech.” Kroon et 211. Oct. 1986.
“High Quality Audio Coding Using Multi—pulse LPC ” by Sharad Singhal, ICASSP ’99: Acoustics, Speech & Signal Processing Conference, 1990.
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