LC7851E Overview
EN5691 CMOS LSI LC7851E QPSK Demodulation and Audio Signal-Processing IC for Satellite Broadcast Reception Overview The LC7851E demodulates the QPSK (quadrature phase shift keying) modulated audio data broadcast by the Japanese BS and CS broadcast satellites and converts that data to an analog audio signal. This IC integrates on a single chip the audio system signal processing required for BS and CS receivers from...
LC7851E Key Features
- QPSK demodulator, PCM decoder, digital filters, D/A converters, and operational amplifiers integrated on a single chip
- The number of required external ponents has been reduced and adjustment-free operation achieved in the QPSK demodulator
- CPU interface using an I2C bus
- Interface circuits for CORTEC and SkyPort descramblers
- Ten to 14 bit expansion of audio data during A mode broadcasts
- Data protection using majority control for the upper bits of the audio data during B mode broadcasts
- Full plement of muting functions
- Audio suppression provided (bit 16 of the postmajority decision control bits)
- Non-audio signal suppression (bits 2 to 5 of the postmajority decision control bits)
- Forced muting