Multiplex communications – Wide area network – Packet switching
Patent
1984-11-16
1987-10-27
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370102, 375122, 381 30, H04J 312, G10L 302
Patent
active
047034807
ABSTRACT:
A digital sub-band coder for audio signals provides for adaptive allocation of bits to (e.g.) two sub-bands. Estimation of the relative energy content of the bands is determined by reference only to those bits which are always transmitted, so that decoding can take place without the need for transmission of side information. Accompanying data may be transmitted in a fixed bit position, or may be by insertion of the data into the lower energy band. In the latter case, the data may optionally be duplicated in both bands when their energy contents are random. The invention can be applied to embedded ADPCM coders.
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IEEE International Conference on Communications, Conference Record, vol. 2, Boston, Mass., Jun. 19-22, 1983, New York (US) S. Ono et al, "64 Kb/s High Quality Speech Codec", pp. 1166-1170.
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ICASSP 81 Proceedings of the IEEE International Conference on Acoustic, Speech and Signal Processing, vol. 2, R. S. Cheung et al, "The Design of a 16KB/S . . . ".
1978 IEEE International Conference on Acoustics, Speech & Signal Processing, Estaban et al, "32 KBPS CCITT Compatible Split Band Coding Scheme".
Cameron Ian R.
Lee Dominic S.
McLintock Robert W.
Westall Frederick A.
British Telecommunications PLC
Kuntz Curtis
Olms Douglas W.
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