First International Conference on Spoken Language Processing (ICSLP 90)

Kobe, Japan
November 18-22, 1990

4.8 kbps Speech Coding Using Frame Synchronous Time Domain Compression (FS-TDC)

Shinya Takahashi, Kunio Nakajima

Information Systems and Electronics Development Laboratory, Mitsubishi Electric Corporation, Kanagawa, Japan

In this paper, we propose a low bit rate (4.0-4.8kbps) speech coding algorithm for digital mobile communication. The coding algorithm is based on a frame synchronous time domain compression (FS-TDC) of LPC residual signal which is optirnaly combined with stochastic coding algorithm. Like other TDC schemes, FS-TDC basically uses pitch periodicity of speech, but different from others, its compression and expansion process are both completed within a frame, and the compression ratio is large and fixed. In evaluation tests, the sochastic coders with FS-TDC shows better speech quality than an usual system, and shows good robustness for channel error if parameters are protected by optimized error protection scheme.

Full Paper

Bibliographic reference.  Takahashi, Shinya / Nakajima, Kunio (1990): "4.8 kbps speech coding using frame synchronous time domain compression (FS-TDC)", In ICSLP-1990, 105-108.