1976 Phare Linear AutoCorrelator Ad

Listen to the music.
Not the noise.

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Noise in the form of hiss, hum and rumble-all the things that effectively cloud the clarity of records, tapes and FM broadcasts.
Ideally, music should be heard against a silent background. The Phase Linear 1000 achieves just that with two unique systems: AutoCorrelator Noise Reduction and Dynamic Range Recovery.
The AutoCorrelator reduces noise by 10 dB without the loss of high frequency music and without pre-encoding.