VOICE CODING DEVICE AND VOICE DECODING DEVICE

Japanese Patent JP3183826

B2

PROBLEM TO BE SOLVED: To improve the transmission characteristic by providing an audible sense weighting filter and a reflection coefficient discrimination means so as to use the filter when the reflection coefficient is at the outside of a specified range and not using the filter when the reflection coefficient is within the specified range.
SOLUTION: A reflection coefficient discrimination section 17 receiving a reflection coefficient calculated by an audible sense weighting filter adaptive device 7 provides an output of '1' when the reflection coefficient is within a specified range and provides an output of '0' when the reflection coefficient is at the outside of the range so as to allow usual filter operation. A switch control section A18 monitors a signal on a signal line 101 and sends a control signal with a content of denoting that a switch 19 selects a signal not passing through an audible sense weighting filter 8 to a signal line 102 when the signal is '1' and sends the control signal with a content of denoting that the switch 19 selects a signal passing through the audible sense weighting filter 8 to the signal line 102 when the signal is '0'. The switch 19 selects any signal under this control. Thus, even in the case of reception of a DTMF signal not a voice signal, production of distortion is prevented.

Atsushi Hotta
Noriaki Kohno
Hideaki Ebisawa

JP14445796A

July 09, 2001

June 06, 1996

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Mitsubishi Electric Corporation

H04B14/04; G10L19/038; G10L19/26; G10L25/78; G10L25/84; (IPC1-7): H04B14/04; G10L19/00

JP950298A
JP7135490A

Shoji Mizoi

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