Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1986-09-09
1987-04-28
Ng, Jin F.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
455186, 455315, 455317, H04B 126
Patent
active
046619950
ABSTRACT:
A multi-superheterodyne receiver having a first local oscillator for generating a first local frequency signal, a first frequency converter for converting to a first intermediate frequency signal a received signal in response to the first local frequency signal, a second local oscillator for generating a second local frequency signal, a second frequency converter for converting to a second intermediate frequency signal the first intermediate frequency signal in response to the second local frequency signal, includes judging circuitry for judging if a residual spurious component is generated when harmonic waves of at least one of the local frequency signals are at certain frequencies. Control circuitry shifts the first local frequency signal by a first predetermined frequency to cause the first intermediate frequency signal to suppress the residual spurious component, and shifts the second local frequency signal by a second predetermined frequency to maintain the frequency of the second intermediate frequency signal constant, when the judging circuitry determines that a residual spurious component will be generated at a preset receiving frequency. Thus, intermodulation disturbances in the receiver are suppressed.
REFERENCES:
patent: 3988681 (1976-10-01), Schurmann
patent: 4075567 (1978-02-01), Klank et al.
patent: 4355412 (1982-10-01), Kawakami
patent: 4545072 (1985-10-01), Skutta et al.
patent: 4551856 (1985-11-01), Victor et al.
Anritsu Electric Co., Limited
Ng Jin F.
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