Multi-rate wideband speech/channel codec based on MPEG-4/CELP for ETSI/GSM full-rate channel

A. Murashima, M. Serizawa, K. Ozawa
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引用次数: 3

Abstract

This paper proposes a wideband multi-rate speech and channel codec based on the MPEG-4/CELP for the ETSI/GSM full-rate channel. In order to improve coding performance under mobile environments, such as channel error and background noise, the proposed codec operates at three bit allocations between speech and channel coding with a constant gross bit-rate of 22.8 kbit/s. The speech coding bit-rates are 10.9, 12.1 and 15.9 kbit/s. It achieves high speech quality under any channel condition by switching the bit allocations and also for noisy speech by using the highest bit-rate. The preliminary subjective evaluation tests show the speech quality is improved by switching the bit allocation under error conditions. It is also comparable of superior to ITU-T Recommendation G.722 48 kbit/s for carrier-to-interference ratios (C/I) higher than 10 dB. The codec at 15.9 kbit/s also gives comparable speech quality to G.722 at 48 kbit/s under background noise conditions.
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基于MPEG-4/CELP的多速率宽带语音/信道编解码器,用于ETSI/GSM全速率信道
针对ETSI/GSM全速率信道,提出了一种基于MPEG-4/CELP的宽带多速率语音信道编解码器。为了提高在移动环境下的编码性能,如信道错误和背景噪声,提出的编解码器在语音和信道编码之间进行3位分配,总比特率为22.8 kbit/s。语音编码码率分别为10.9、12.1和15.9 kbit/s。它通过切换比特分配在任何信道条件下都能获得高的语音质量,并且通过使用最高比特率来处理有噪声的语音。初步的主观评价测试表明,在错误条件下切换比特分配可以提高语音质量。对于高于10db的载波干扰比(C/I),它也可与ITU-T建议G.722 48 kbit/s相比。在背景噪声条件下,15.9 kbit/s的编解码器也可以提供与48 kbit/s的G.722相当的语音质量。
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