Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1987-06-18
1989-04-25
Groody, James J.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358105, H04N 514
Patent
active
048252875
ABSTRACT:
According to the present invention, the number of elements of a signal processing circuit or the like can be drastically reduced by conducting a time-multiplex processing. In a transversal filter having a coefficient of symmetry of 16 taps, for example, the prior art requires about 58,000 transistors. In case four signal processing cores (i.e., SPC) having a function of four taps are used, the number of transistors required can be reduced to about 34,000 by a duplexing process. In case two SPCs having a function of eight taps are used, the number can be reduced to about 19,000 by a quadplexing process. In case, moreover, one SPC having a function of sixteen taps is used, the number can be reduced to about 13,000 by an octaplexing process. Here, the reason why the number of elements is not halved even if the number of the SPCs is halved is that the number of elements to be used in control circuits, memories and so on increases.
REFERENCES:
IEEE International Solid-State Circuits Conference, Digest of Technical Papers; "A Micro-Programmable Realtime Image Processor"; Mori et al.; Feb. 20, 1986; pp. 144-145.
IEEE International Solid-State Circuits Conference, Digest of Technical Papers; "An Image Signal Processor"; Fukushima et al.; Feb. 25, 1983; pp. 258-259.
Baji Toru
Matsuura Tatsuji
Ohba Shinya
Tsukada Toshiro
Groody James J.
Hitachi , Ltd.
Parker Michael D.
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