发明名称 |
VOICE TRANSMISSION AND RECEIVING SYSTEM EMPLOYING PULSE DURATION MODULATIONS WITH A SUPPRESSED CLOCK |
摘要 |
A voice transmission system including coded voice information using pulse duration modulation (PDM) with a suppressed clock and wherein this suppressed clock pulse duration modulated voice signal is used to modulate a phase shift keying modulator (PSK). The receiver includes a phase shift keying demodulator which feeds a limiter having a wide bandwidth so as to achieve the highest possible processing gain. The receiver also includes a voltage controlled oscillator which is fed an error signal derived from an integrator so as to produce an output signal from the voltage controlled oscillator to replace the suppressed clock.
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申请公布号 |
US3667046(A) |
申请公布日期 |
1972.05.30 |
申请号 |
USD3667046 |
申请日期 |
1969.10.09 |
申请人 |
MAGNAVOX CO.:THE |
发明人 |
RALPH W. SCHOOLCRAFT |
分类号 |
G10L19/00;H03K7/08;H04B14/02;(IPC1-7):H04B1/00 |
主分类号 |
G10L19/00 |
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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