Stereophonic receiver having a noise reduction control circuit

A stereo tuner apparatus for receiving stereo sound signals and transmitting said received sound signals with noise reduction cosprising:

• a left channel and a right channel each having an input buffer amplitier and an output buffer means for transmitting the received signal and monitor means to monitor the high frequency signal content of the received signal,
• a left channel signal separation control means and a right channel signal separation control means, each of said separation control means comprising,
• a highpass filter set to pass only the stereo sound high frequencies in said received signals,
• a full wave rectifier connected to said highpass filter and operable to establish a D.C. signal proportional to said stereo sound high frequencies,
• attack filter means connected to said rectifier to transmit said D.C. signal,
• decay filter means connected to said rectifier to hold said D.C. signal, and
• a transducter amplifier connected to said separation control means and connected to said decay filter means and to said attack filter means having a voltage sensitive input means for adjusting the bandwidth of the amplifer and thereby separately adjusting the stereo signal separation in the left channel and in the right channel to produce a varying blending of the signal inversely proportional to the high frequency content in the received stereo signal.