发明名称 |
Radio receiver for tone modulated signals |
摘要 |
A radio receiver for frequency modulated (FM) tones. Received signals are split and one split portion of the signal is phase shifted relative to the other and mixed with a local oscillator. The signal as received clocks a flip-flop. The phase shifted signal is fed to the switching input of the flip-flop. The input signal having been modulated with an FM tone which oscillates about the frequency of the local oscillator, the output of the flip-flop is a digital waveform the frequency of which is the same as that of the modulating tone. This digital waveform is applied to a band pass filter accepting the fundamental frequency of the digital wave form from the flip-flop for passage to a detector.
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申请公布号 |
US4254503(A) |
申请公布日期 |
1981.03.03 |
申请号 |
US19790086542 |
申请日期 |
1979.10.19 |
申请人 |
INTERNATIONAL STANDARD ELECTRIC CORPORATION |
发明人 |
VANCE, IAN A. W. |
分类号 |
G08B3/10;H03D3/20;H04B1/26;H04L27/14;H04L27/152;H04W88/02;(IPC1-7):H04B1/16 |
主分类号 |
G08B3/10 |
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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