Pulse or digital communications – Pulse code modulation
Patent
1994-05-18
1995-12-05
Chin, Stephen
Pulse or digital communications
Pulse code modulation
375244, 375346, 371 371, H04B 1404
Patent
active
054736340
ABSTRACT:
A storage medium (15) has capacity capable of storing data for one frame which is formed by 2.sup.M by 2.sup.N bits. A counter circuit (12) repetitively counts bit numbers of input signals in a range of 1 to 2.sup.M by 2.sup.N, while another counter circuit (13) counts frame numbers. A signal selection circuit (14) specifies addresses the storage medium (15) in an order obtained by successively carrying out N-digit leftward rotation every renewal of the frame number with respect to the count value of the counter circuit (12) expressed in a binary number. A control signal R/W specifies reading and writing in the storage medium (15) every addressing. Thus, data signals DIN belonging to one frame written in the storage medium (15) are read when a next frame is written. The order of the read data signals is leftwardly rotated by N bits with respect to that in writing. Thus, the storage capacity of the storage medium (15) can be halved as compared with the prior art.
REFERENCES:
patent: 4568915 (1985-02-01), Gutleber
patent: 4833693 (1989-05-01), Eyuboglu
patent: 5056112 (1991-10-01), Wei
Chin Stephen
Mitsubishi Denki & Kabushiki Kaisha
Webster Bryan E.
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