Coded data generation or conversion – Analog to or from digital conversion – Differential encoder and/or decoder
Patent
1991-06-21
1992-05-12
Williams, Howard L.
Coded data generation or conversion
Analog to or from digital conversion
Differential encoder and/or decoder
341155, H03M 112
Patent
active
051131897
ABSTRACT:
A analog to digital (A/D) conversion system (10 or 20) receives a modulated analog signal, translates the frequency of the signal to a lower frequency, and converts the analog signal to a filtered digital signal. In one form, the conversion system (10) has an analog signal multiplier (16), and A/D converter (18), an oscillator (12) and a frequency divider (14). Frequency multiplier (16) translates the frequency of the analog signal, and A/D converter (18) converts the analog signal to digital form. Frequency divider (14) receives a clock signal from oscillator (12) and divides the frequency of the clock signal. Because the same clock signal is used for frequency translation and analog to digital conversion, a phase error is not introduced in the output digital signal. Additionally, the frequency divider (14) forces the frequencies of the analog and digital signals to be an integer ratio for subsequent demodulation.
REFERENCES:
patent: 3706944 (1970-12-01), Tewksbury
patent: 4761634 (1988-08-01), Yamaguchi et al.
patent: 4978956 (1990-12-01), Berresheim
Messer Dion D.
Park Sang-il
Thompson Charles D.
Meyer Jonathan P.
Motorola Inc.
Williams Howard L.
Young Brian K.
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