DPCM system with adaptive quantizer having unchanging bin number

Details DPCM system with adaptive quantizer having unchanging bin number DPCM system with adaptive quantizer having unchanging bin number

1987-12-01

1990-01-30

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

358135, 358136, H04B 110, H04B 1404

Patent

active

048978558

ABSTRACT:
Difference signals are coarsely quantized in a plurality of modes in a DPCM TV system. The fill and rate of fill of the transmitting rate buffer is monitored to prevent errors due to underflow and overflow of the transmitting rate buffer. The data rate is adaptively reduced in response to the rate of fill and fill by an adaptive coarse quantizer which is switched to a more coarse quantizing mode to reduce the transmit data rate. The coarse quantizing values are selected from among the members of the ensemble of values used for the least coarse quantizing mode. This avoids quantizer mode information having to be transmitted to the receiver and giving rise to additional transmitting overhead.

REFERENCES:
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"On Quantizers for DPCM Coding of Picture Signals" by Netravali, published at pp. 360-370 of IEEE Transactions in Information Theory, May 1977.
"Picture Coding: A Review" by Netravali, published in Proceedings of the IEEE, vol. 68, No. 3, Mar. 1980, p. 389.

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