Coded data generation or conversion – Analog to or from digital conversion – Analog to digital conversion
Patent
1993-11-09
1995-02-07
Young, Brian K.
Coded data generation or conversion
Analog to or from digital conversion
Analog to digital conversion
455214, H03M 112
Patent
active
053879139
ABSTRACT:
A receiver (20) digitally tunes a radio frequency (RF) signal at the same time that it mixes the RF signal to a frequency suitable for demodulation and channel separation. A clock frequency divider (35) receives a reference clock signal, and divides the reference clock signal to provide a divided signal at a predetermined frequency, such as 20 kHz for AM stereo. A clock frequency multiplier (36) receives the divided signal and a digital tuning input signal, and provides an analog tuning signal at a multiple of the divided signal as determined by the digital tuning input signal. An analog multiplier (31) then mixes the RF signal with the analog tuning signal. An analog-to-digital converter (ADC) (32) receives an output of the analog multiplier (31), and is clocked by the reference clock signal to eliminate any clock phase error. A digital demodulator (38) then demodulates and further processes an output of the ADC (32).
REFERENCES:
patent: 4902979 (1990-02-01), Puckette
patent: 5113189 (1992-05-01), Messer et al.
patent: 5146186 (1992-09-01), Vella
patent: 5249204 (1993-09-01), Funderburk et al.
patent: 5254958 (1993-10-01), Flach et al.
Messer Dion D.
Park Sang-il
Motorola Inc.
Polansky Paul J.
Young Brian K.
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