Quieting receiver during power interruption

Details Quieting receiver during power interruption Quieting receiver during power interruption

H - Electricity

04

B

325/120

H04B 1/10 (2006.01) H03J 5/02 (2006.01)

Patent

CA 2009603

A receiver comprises a synthesizing tuner circuit for detecting a selected input signal and an audio circuit for reproducing the audio content in the detected signal. The tuner circuit includes a local oscillator, a prescaler, a phase locked loop and an integrator, and has a tendency to uncontrollably detune during AC power interruption and generate audible noise during the detuning. The audible noise is introduced into the audio content of the detected signal. An AC power interruption detector monitors a run power supply and generates a control signal when the run supply falls below a predetermined threshold. A control circuit responsive to the control signal first disables normal operation of the tuner circuit and then disables the audio circuit, thereby reducing the audible noise. The tuner circuit may be disabled by decoupling the output of the phase locked loop from the input to the integrator, enabling the input to float. In the absence of a corrective signal from the phase locked loop, the integrator maintains a substantially constant output tuning voltage and prevents sudden detuning.

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