发明名称 |
ELECTRONIC DEVICE HAVING LOW RADIO WAVE DISTURBANCE FROM SYSTEM CLOCK SIGNAL |
摘要 |
<p>A printer having greatly reduced radio frequency interference from the system clock signal therein is provided by angle modulating the system clock signal in accordance with a desired modulation signal. The modulation signal is chosen so as to spread and thereby reduce the energy level of the system clock signal at the carrier and at the harmonics without interfering with proper detection of the system clock signal by the electronic circuits within the printer requiring the clock signal for proper timing. In a first embodiment the angle modulation is provided by an FM modulator responsive to a modulating signal which is either sinusoidal or randomly varying in nature. In a second embodiment the angle modulation is provided by an arrangement which combines a modulated subcarrier with the basic clock frequency in a phase locked loop.</p> |
申请公布号 |
JPS5995742(A) |
申请公布日期 |
1984.06.01 |
申请号 |
JP19830194448 |
申请日期 |
1983.10.19 |
申请人 |
PURINTORONIKUSU INC |
发明人 |
DEBITSUDO MITSUCHIERU SUTANFUOORU |
分类号 |
B41J2/51;G06F1/04;G06K15/10;H03C3/09;H04B15/02;H04B15/04 |
主分类号 |
B41J2/51 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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