Title :
Speech coding scheme for personal communications under radio interference noises
Author :
Fukasawa, A. ; Takizawa, Yasuhisa ; Oda, K. ; Yamano, C.
Author_Institution :
Commun. Sci. Lab., Oki Electr., Tokyo, Japan
Abstract :
This paper describes a new method of ADPCM which is robust against radio interference and capable of voiceband data transmission. The transmission errors are studied in with reference to bit errors in the data frame and frame erasures (packet loss). A new ADPCM method is proposed in this paper which is robust against bit errors. The adaptive quantizer has been improved to provide good quality under noise. The stability of the predictor is guaranteed. The frame compensation method for frame erasure is also described. The high speech quality and the predictor stability was confirmed by the proposed method
Keywords :
data communication; differential pulse code modulation; land mobile radio; personal communication networks; radiofrequency interference; speech coding; ADPCM; adaptive quantizer; bit errors; data frame; frame compensation method; frame erasures; packet loss; personal communications; predictor stability; radio interference noise; speech coding; speech quality; transmission errors; voiceband data transmission; Adaptive filters; Bit error rate; Data communication; Delay; Electromagnetic interference; Fading; Noise robustness; Personal communication networks; Robust stability; Speech coding;
Conference_Titel :
Vehicular Technology Conference, 1994 IEEE 44th
Conference_Location :
Stockholm
Print_ISBN :
0-7803-1927-3
DOI :
10.1109/VETEC.1994.345391
