Stereo composite processor for stereo radio receiver

Details Stereo composite processor for stereo radio receiver Stereo composite processor for stereo radio receiver

H - Electricity

03

G

325/73

H03G 5/18 (2006.01) H04B 1/16 (2006.01) H04H 5/00 (2006.01)

Patent

CA 1129009

C-3050 D-2,402 Abstract of the Disclosure A radio receiver is effective to receive a radio frequency signal and derive therefrom a standard stereo composite signal comprising a sum of channels signal having components within a first band of fre- quencies in the audio range and a difference of chan- nels signal having components within a second band of frequencies above the first band of frequencies. The radio receiver is provided with a low pass filter having a high frequency roll-off characteristic within the first frequency band and a substantially flat attenuated amplitude characteristic across the second frequency band. Linear mixer apparatus mixes filtered and unfil- tered stereo composite signals in controlled relative proportion responsive to a control signal to produce a modified stereo composite signal for application to stereo decoder apparatus in order to simultaneously roll-off the high frequencies in each derived channel and to attenuate the difference of channels signal in degree controlled by the control signal. Control signal generating apparatus provides said control signal in response to a parameter indicative of noise in the stereo composite signal.

333838

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