Communication receiver system having a decoder operating at variable frequencies
AssigneeMotorola, Inc.
InventorsMichael J. DeLuca, Jeffrey B. Reed
Life of this patent
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Abstract
A paging receiver and a method for minimizing spurious interference signals in the radio frequency (RF) stages and the intermediate frequency (IF) stages. The paging receiver includes a receiving means, a timing means, a voltage converting means, and a decoding means. A frequency for the timing signals generated by the timing means is selected to minimize spurious signal response. The timing signals are simultaneously applied to the decoding means and the voltage converting means. The frequency of the timing signal can be varied to minimize spurious signal response. The decoding means is notified of the timing signal frequency to effect the detecting and decoding of received coded information in real time.
Claims27
A method for minimizing spurious interference signals generated in a receiver receiving an information signal modulated upon one of a plurality of carrier frequencies, the receiver including
- a frequency receiving means for receiving and demodulation information modulated upon at least one carrier frequency,
- information processing means for processing the demodulated information signal, and
- an oscillator for providing a clock signal for said information processing means, the clock signal having a selectable clock frequency, wherein the spurious interfering signals are generated by said information processing means and are a function of the frequency of the clock signal, said method comprising the steps of:
- (a) determining a clock frequency corresponding to a carrier frequency wherein the spurious interfering signals are reduced;
- (b) determining the carrier frequency of the frequency receiving means;
- and
- (c) selecting the clock frequency corresponding to the determined carrier frequency.
A method for minimizing spurious interference signals generated in a communication receiver for receiving coded information having a predetermined information rate, the communication receiver including
- a receiving means for receiving the coded information,
- an adjustable timing means for generating timing signals derived from a selectable reference frequency, and
- a decoding means clocked by the selectable reference frequency and responsive to the timing signals, for decoding the coded information, said method comprising the steps of:
- (a) selecting a reference frequency to reduce spurious interference signals generated by the decoding means and received by the receiving means;
- (b) adjusting the frequency of the timing signals to correspond to the predetermined information rate;
- (c) receiving the coded information;
- and
- (d) decoding the received coded information at a rate provided by the timing signals.
A communication receiver for receiving coded information having an information rate, said communication receiver comprising:
- receiving means for receiving and demodulating the coded information;
- decoding means having an operating frequency for decoding the received coded information;
- voltage generating means, coupled to said decoding means and receiving means, for providing power;
- and
- timing means for controlling the operating frequency of said decoding means wherein spurious interference signals include signals originating from the decoding means and interfering with the receiving means are minimized, and wherein the decoding means effectively decodes the coded information at the information rate.
Dependencies are inferred from the claim text.