Radio communication system

Details Radio communication system Radio communication system

1995-03-20

1996-09-10

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

455 371, 455307, 455340, H04B 106, H04B 700

Patent

active

055554539

ABSTRACT:
A CW (Continuous Wave) radio frequency signal converted to an IF (Intermediate Frequency) signal is mixed with a local oscillator signal by an IF mixer, and the obtained signal is converted to a digital signal by an ADC (Analog-to-Digital Converter). A digital bandpass filter passes only the target component in the output of the ADC. The passed IF signal is demodulated by a digital demodulator, and the demodulated signal is converted to an analog signal before being output as a sound. When pitch control to increase the reception pitch by .DELTA.f is instructed, an MPU (Microprocessor Unit) alters the frequency of the local oscillator signal by .DELTA.f as well as the center frequency of the digital bandpass filter by .DELTA.f, so that the center frequency of the input signal to a narrow-band filter coincides with the center frequency of the digital bandpass filter.

REFERENCES:
patent: 4475242 (1984-10-01), Rafal et al.
patent: 5179727 (1993-01-01), Imagawa
patent: 5193223 (1993-03-01), Walczak et al.
patent: 5263187 (1993-11-01), Sugawa et al.
patent: 5303404 (1994-04-01), Kivela

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