Title:
SYSTEM AND METHOD FOR TRANSMITTING DATA
Document Type and Number:
Japanese Patent JP2691138
Kind Code:
B2
Abstract:
PURPOSE: To reduce EMI radiation by converting data to be put on a plurality of data lines in such a mode that the EMI generated from the data lines are reduced as compared with the case where the data are not converted.
CONSTITUTION: When a SYNC signal which is one of interface signals is real, n-bit counters 110 and 120 are reset and, when the SYNC signal is false, the counters 110 and 120 make counting operations. Adders 120 and 220 respectively add the output values of the counters 110 and 120 to data '1',..., 'n' at every bit including carries. Timing adjusting circuits 130 and 230 make the output value of the counter 110 to be properly subtracted by means of a signal demodulation circuit 200 by adjusting the operations of a signal conversion circuit 100 and the operating timing of the circuit 200. When, for example, all bits of the data '1',..., 'n' do not change for more than a fixed period of time, the data conversion by means of the circuit 100 is not required, because EMI radiation is originally less.
Inventors:
Shinichi Igami
Takeshi Asano
Takeshi Asano
Application Number:
JP20509394A
Publication Date:
December 17, 1997
Filing Date:
August 30, 1994
Export Citation:
Assignee:
International Business Machines Corporation
International Classes:
H04L25/02; G06F1/04; G06F3/00; G06F13/40; G09G3/20; G09G5/00; H03M5/06; H04B15/00; H04B15/04; H04L25/49; (IPC1-7): H04L25/02; G06F3/00; H03M5/06; H04B15/00; H04L25/49
Domestic Patent References:
| JP4303234A | ||||
| JP4219082A | ||||
| JP6303502A | ||||
| JP7297691A |
Attorney, Agent or Firm:
Kiyoshi Goda (2 outside)
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