Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1996-03-05
1999-08-10
Vo, Nguyen
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
4551681, 4551803, 4551832, 455260, 455323, H04B 126
Patent
active
059373385
ABSTRACT:
A scanning radio receiver of triple conversion superheterodyne tuning, having a CPU and a keyboard. The CPU has a programmable memory to store frequencies received by the scanning radio receiver. A first and second frequency mixer for frequency converting a radio wave signal, with a respective local frequency, providing for a first and second IF signal, respectively. A PLL frequency synthesizer for generating the respective local frequencies, depending upon the frequency of the desired radio wave signal to be received, the frequency of which is keyed into the keyboard. A third frequency mixer for frequency converting the second IF signal with a third local frequency. An FM demodulator for reproducing an FM audio signal. An AM detector for reproducing an AM audio signal. An AM/FM switch for receiving the FM and AM audio signals and providing a selective audio signal in response to instruction from the CPU.
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General Research of Electronics Inc.
Kincaid Lester G.
Vo Nguyen
LandOfFree
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