Title:
VOICE CODING DEVICE
Document Type and Number:
Japanese Patent JP3387086
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To improve a compression rate when voice signals in a plurality of channels are subjected to predictive coding using the fact that the correlation among the upper bit data of each channel of voice signals of the plurality of channels is strong and no correlation exists among the lower bit data.
SOLUTION: An adding circuit 1a computes the sum signal (L+R) of stereophonic 2ch signals L and R and outputs the signal to a single ch lossless/encoder 2D1 of a sum ch. A subtracting circuit 1b computes the difference signal (L-R) and outputs the signals to a single ch lossless/encoder 2D2 of a difference ch. The encoders 2D1 and 2D2 conduct predictive coding of the signals (L+R) of upper 16 bits, difference Δ(L+R) of the difference signals (L-R) and the Δ(L-R) among 24 bits, and lower 8 bits are transferred as they are through a recording medium or a communication medium.
Inventors:
Yoshiaki Tanaka
Shoji Ueno
Norihiko Fuchigami
Shoji Ueno
Norihiko Fuchigami
Application Number:
JP2000321499A
Publication Date:
March 17, 2003
Filing Date:
October 13, 1998
Export Citation:
Assignee:
Victor Company of Japan Ltd.
International Classes:
G10L19/02; G10L19/00; G10L19/008; G10L19/04; G10L25/78; G11B20/12; H03M7/36; H04B14/04; (IPC1-7): G10L19/00; G10L19/04; G11B20/12; H03M7/36; H04B14/04
Domestic Patent References:
| JP6444499A | ||||
| JP3108824A | ||||
| JP6133252A | ||||
| JP10320928A | ||||
| JP10233058A |