Digital to analog data demodulation circuit

Details Digital to analog data demodulation circuit Digital to analog data demodulation circuit

1988-08-05

1990-05-15

Shoop. Jr., William M.

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

341126, H03M 166

Patent

active

049261797

ABSTRACT:
A digital to analog data demodulating circuit adapted for selectively demodulating analog data from a plurality of digital data each having a different sampling frequency. The circuit includes an input terminal provided for selectively receiving the plurality of digital data, a digital filter coupled to the input means for shifting higher the sampling frequency of the digital data applied from the input terminal, a D/A converter coupled to the digital filter for generating first and second analog conversion data separated into a lower frequency band and a higher frequency band, the lower frequency band being alsmost conicident with the frequency band of the analog data digitized to the corresponding digital data and the higher frequency band having a center frequency coincident with the shifted sampling frequency and an LPF coupled to the D/A converter for removing the second analog conversion data from the output of the D/A converter.

REFERENCES:
patent: 3949299 (1976-04-01), Song
patent: 4059800 (1977-11-01), Jones, Jr.
patent: 4570153 (1986-02-01), Kobayashi et al.
patent: 4646173 (1987-02-01), Kammeyer et al.
patent: 4812815 (1989-03-01), Miyakoshi et al.
patent: 4862170 (1989-08-01), Hashimoto et al.

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