Voice-coded data error processing apparatus and method

Details Voice-coded data error processing apparatus and method Voice-coded data error processing apparatus and method

1997-06-26

1999-07-27

Grant, William

Error detection/correction and fault detection/recovery

Pulse or data error handling

Error/fault detection technique

370 79, 370342, 375 40, G06F 1110

Patent

active

059283793

ABSTRACT:
A voice-coded data error processing system includes a demodulator, an error frame detection section, an error data identification section, a partial conversion section, and a decoder. The demodulator demodulates a received transmission frame containing voice-coded data which is encoded by ADPCM (Adaptive Differential Pulse Code Modulation) and modulated based on QPSK (Quadrature Phase Shift Keying). The error frame detection section detects an error in the transmission frame from CRC (Cyclic Redundancy Check) information contained in the voice-coded data output from the demodulator. The error data identification section identifies voice-coded data corresponding to an error portion when the error frame detection section detects an error frame. The partial conversion section converts only the voice-coded data corresponding to the error portion from the demodulator on the basis of an output from the error data identification section. The decoder decodes the voice-coded data output from the demodulator and the partial conversion section and outputs analog voice data. A voice-coded data error processing technique is also disclosed.

REFERENCES:
patent: 4223405 (1980-09-01), Hattori
patent: 4621368 (1986-11-01), Onoe et al.
patent: 5436899 (1995-07-01), Fujino et al.
patent: 5586113 (1996-12-01), Adachi et al.
patent: 5734648 (1998-03-01), Adachi et al.
patent: 5781570 (1998-07-01), Harotti

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