Apparatus and method for automatically controlling a reference f

Details Apparatus and method for automatically controlling a reference f Apparatus and method for automatically controlling a reference f

1995-06-29

1996-02-20

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

455 75, 455142, 4551922, 455316, 375216, H04B 116

Patent

active

054937140

ABSTRACT:
An apparatus and method for automatically controlling a reference frequency (120) in a receiver (104) that receives either analog (116) or digital (136) information signals. The receiver (18) includes a frequency translator (109) for translating a carrier frequency (137) to an intermediate frequency (118) and maintaining the intermediate frequency (118) at a desired value responsive to the reference frequency (120). A first measure of frequency error (211, 212) is detected between the reference frequency (120) and the intermediate frequency (118). A second measure of frequency error (125, 126) is detected between the reference frequency (120) and the intermediate frequency (118). A current signal (213) is produced responsive to the first measure of frequency error (211, 212) when the receiver receives the analog information signal (116) and responsive to the second measure of frequency error (125, 126) when receiver receives the digital information signal (136). A frequency control signal (130) is produced responsive to the current signal (213) to automatically control thereby the reference frequency (120) when the receiver (18) receives either analog (116) or digital (136) information signals.

REFERENCES:
patent: 4817192 (1989-03-01), Phillips et al.
patent: 4955074 (1990-09-01), Omoto
patent: 5163159 (1992-11-01), Rich et al.

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