Two-way code converting system专利检索- .可逆模/数转换器专利检索查询-专利查询网

Two-way code converting system
申请号	JP1547681	申请日	1981-02-04	公开(公告)号	JPS57129525A	公开(公告)日	1982-08-11
申请人	Fujitsu Ltd;			发明人	KARIBE HIROHISA; IKEZAWA MASUSHI; MATSUMURA TOSHIHIKO; FUKUI HIROKAZU;
摘要	PURPOSE:To realize the asynchronous action of two-way code conversion, by providing the 1st PLL circuit plus its subordinate 2nd PLL circuit. CONSTITUTION:The 2nd PLL circuit 25 receives clocks CLK1 and CLK2 of different phases which have a comparatively high frequency compared with the clock that is produced from a voltage control type oscillator within the 1st PLL circuit 24. Then one of these two clocks is selected through a clock selecting circuit 31 to be used as a clock CLK3. This clock CLK3 is divided by a frequency divider circuit 32 to produce a clock corresponding to a receiving synchronous signal 27, and the phase comparison is carried out through a phase comparator 30. The clock is consecutively used if the state of phase is satisfactory and then replaced with another clock if the state of phase becomes unsatisfactory.
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