Communication system capable of improving transmission efficienc

Details Communication system capable of improving transmission efficienc Communication system capable of improving transmission efficienc

1989-07-24

1991-09-03

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

358135, H04B 1406

Patent

active

050460714

ABSTRACT:
In an encoding device for transforming a sequence of digital image signals into a sequence of transformed signals which is subjected to interframe predictive coding by the use of a subtracter and a local decoding loop, the subtracter supplies a block judgement circuit with a sequence of error signals divided into a sequence of blocks. The block judgement circuit judges whether each block is a significant block or a less significant block to produce significant and less significant block signals, respectively. The local decoding loop is selectively put into normal and specific modes in response to the significant and the less significant block signals, respectively. In the normal mode, an inverse transform circuit and a local transform circuit are normally operated through a frame memory in the local decoding loop by producing a sequence of inverse transformed signals and a sequence of local decoded signal, respectively. In the specific mode, the inverse transform and the local transform circuits are bypassed when the less significant block signal is produced by the block judgement circuit. Alternatively, the frame memory may be controlled by a write-in controller supplied with the significant and the less significant block signals. Similar operation is carried out in a decoding device.

REFERENCES:
patent: 4292651 (1981-09-01), Kretz et al.
patent: 4783792 (1988-11-01), Akagiri et al.
patent: 4805017 (1989-02-01), Kaneko et al.
patent: 4837618 (1989-06-01), Hatori et al.
patent: 4894713 (1990-01-01), Delogne et al.

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