TDA1591 - PLL stereo decoder and noise blanker

Adjustment-free voltage controlled PLL oscillator for ceramic resonator (f = 456 kHz)
Pilot signal dependent mono/stereo switching
Analog control of mono/stereo change over [stereo blend, Stereo Noise Controller (SNC)]
Adjacent channel noise suppression (114 kHz)
Pilot canceller
Analog control of de-emphasis; High Cut Control (HCC)
Applicable as source selector for AM/FM/cassette switching
Separate interference noise detector
Integrated input low-pass filter for delayed noise blanking
Noise blanking at MPX-demodulator outputs
Internal voltage stabilization.