A 22 K Bd mobile video telephone scheme

[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology Pub Date : 1992-05-10 DOI:10.1109/VETEC.1992.245429

R. Stedman, R. Steele, H. Gharavi, L. Hanzo

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引用次数: 2

Abstract

The complexity, image quality, bandwidth efficiency, and robustness issues of a mobile video telephone scheme for personal communications networks (PCNs) are addressed. The motion-compensated 55 kb/s subband codec using seven nonuniformly spaced active bands with bandspecific scanning and runlength coding achieves image peak signal-to-noise ratios (SNR) of around 38 dB, associated with good communications quality for monochrome common intermediate format images sampled at 10 frames per second. The motion dependent bitrate fluctuations are smoothed out by buffering with adaptive quantizer control feedback. The video bits are then sorted into two sensitivity classes and error protected by a twin-class binary BCH scheme. The separately BCH-encoded more significant bits (MSB) and less significant bits (LSB) are transmitted via separate subchannels of the 16-level quadrature amplitude modulator (16-QAM), having different integrity. The overall signaling rate becomes 22 kBd. No equalizer has to be used yet unimpaired image quality is achieved for channel SNR in excess of 20 dB.<>

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22kbd流动视像电话方案

解决了个人通信网络(pcn)移动视频电话方案的复杂性、图像质量、带宽效率和鲁棒性问题。运动补偿的55 kb/s子带编解码器使用7个非均匀间隔的有源带，具有特定的带扫描和运行长度编码，可实现约38 dB的图像峰值信噪比(SNR)，对于以每秒10帧采样的单色普通中间格式图像具有良好的通信质量。运动相关的比特率波动通过自适应量化器控制反馈的缓冲来平滑。然后将视频比特分为两个灵敏度级别，并通过双级二进制BCH方案保护错误。单独的bch编码的高有效位(MSB)和低有效位(LSB)通过16级正交调幅器(16-QAM)的单独子信道传输，具有不同的完整性。整个信号速率变为22kbd。无需使用均衡器，但对于超过20 dB的信道信噪比，可以实现无损的图像质量。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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[1992 Proceedings] Vehicular Technology Society 42nd VTS Conference - Frontiers of Technology

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