| 发明名称 |
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| 摘要 |
PROBLEM TO BE SOLVED: To allow the digital portable telephone system to provide the output of quality deterioration warning information in response to the degree of deterioration in a reproduced voice signal by taking correlation between deterioration in channel and voice quality. SOLUTION: A decoding section 22 of a digital signal processor(DSP) conducts decoding error correction processing of coded voice data and when a CRC cyclic redundancy check error detector 22-6 detects it that voice data has an error, a bad frame masking processing section 22-10 conducts processing of preventing deterioration in voice quality. A warning tone decision processing section 61 of a main CPU accumulates consecutive frames of voice data by a prescribed number of frames while shifting a status number of bad frame masking one by one frame each, decides the propriety of the output of warning information depending on the accumulated sum and controls a warning tone output device 31 to outputs a warning tone when the section 61 decides its propriety of output. |
| 申请公布号 |
JP2891922(B2) |
申请公布日期 |
1999.05.17 |
| 申请号 |
JP19960041127 |
申请日期 |
1996.02.28 |
| 申请人 |
SAITAMA NIPPON DENKI KK;NIPPON DENKI KK |
发明人 |
SHIONO KATSUMI;ONO SHIGERU |
| 分类号 |
H04L1/00;H04B7/26;H04B14/04;H04B14/06 |
主分类号 |
H04L1/00 |
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