发明名称 |
Amplitude and frequency modulation system |
摘要 |
{PG,1 Combined amplitude and frequency-shift-keying (AM-FSK) modulation of a carrier wave by a baseband data signal achieves significant suppression of one of the sidebands to ease the design requirements of filters generally used in the transmission of FSK signals. The significant suppression effect is observed when the ratio of minimum to maximum amplitude of the envelope of the amplitude modulated carrier wave is restrained to be approximately between 0.6 and 0.9.
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申请公布号 |
US4170764(A) |
申请公布日期 |
1979.10.09 |
申请号 |
US19780883656 |
申请日期 |
1978.03.06 |
申请人 |
BELL TELEPHONE LABORATORIES INC |
发明人 |
SALZ, JACK;WERNER, JEAN J |
分类号 |
H04L27/10;H03C5/00;H04B1/66;H04L27/12;H04L27/32;(IPC1-7):H03C5/00 |
主分类号 |
H04L27/10 |
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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