US 5,331,681 AGranted

Function adjustable signal processing device

AssigneeHitachi, Ltd.

InventorsNobukazu Doi, Tohru Setoyama

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Abstract

A signal processing device is provided with a plurality of signal processing circuits which are integrated on a monolithic semiconductor chip and which execute a plurality of predetermined signal processing stages. Signal input terminals are connected with predetermined one of the signal processing circuits for receiving input signals necessary for the plurality of signal processing stages. A first signal output circuit outputs the final signal processing result while a second signal output circuit outputs the intermediate processing results obtained from the signal processing circuits other than a signal processing circuit which performs the final stage signal processing. A plurality of selection circuits are respectively located on each of signal transfer paths for transferring the intermediate signal processing result to a succeeding signal processing circuit. Each selection circuit is provided with supplemental signal input terminals for externally receiving signals, respectively, and each of said selection can serve to select either of the intermediate signal processing result or the signal received at a supplemental signal input terminal on the basis of a predetermined control signal, with the selected signal being supplied to the succeeding signal processing circuit.

Claims8

Dependent claims

A function adjustable signal processing device integrated on monolithic semiconductor chip comprising:

a first signal processing device comprising:
a plurality of signal processing circuits for executing a plurality of predetermined signal processing stages in series, each of said signal processing circuits having an external input terminal and an external output terminal which are independent of one another;
a plurality of selection means located between said plurality of signal processing circuits each having an additional external signal input terminal and a control input terminal, and each coupled to receive a processed signal applied to one of said external output terminals from a signal processing circuit of a preceding stage and to output one of either said received processed signal applied to said external output terminal by said signal processing circuit of said preceding stage or a signal inputted from said additional external signal input terminal, wherein said output is provided selectively, according to a predetermined state control signal applied to said control input terminal, to one of said plurality of signal processing circuits provided at a succeeding stage;
and
a second external signal processing device,
independent from said first signal processing device, integrated on the monolithic semiconductor chip and connected to at least one of said additional external input terminals and at least one of said external output terminals.

3 more elements

Dependencies are inferred from the claim text.