Sanyo DP46142, Service Manual

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1.2.7. Front-End Demod / Demux
•
Integrated 8VSB/QAM-B demodulator
• ATSC 8-VSB demodulation
- Enhanced 8-VSB multi-path performance with wide equalizer coverage
- Superior VSB indoor reception using enhanced equalization and synchronization algorithms,
enabling Brazil and other 0 dB ghost reception
- Adaptive control loops dependent upon channel conditions for fast channel acquisition and
optimal tracking
- Advanced doppler ghost rejection
• QAM-B demodulation
- ANSI/SCTE 07, ITU-T J.83 Annex B 64-/256-QAM, 5.06/5.36 Msymbol/sec rate, respectively
- Support all DI modes up to I=128, J=8
- 84-tap equalization range: 36 FFE and 48 DFE for superior cable micro-reflections rejection
- Enhanced phase noise rejection
- Excellent burst noise and combined distortion rejection
- Exceptional AM noise rejection
- Fast channel auto search based on auto 64-/256-QAM detection and wide carrier acquisition
range
• Advanced system functions
- Accepts 44 MHz from the tuner, eliminating external base-band demodulation
- IF AGC PWM output
- All digital recovery loops
- FEC statistics, receiver status, and channel data such as S/N ratio, equalizer taps, carrier offset,
and more are available
•

Adaptive selection of receiver
- Adaptive recovery loops based on channel conditions are used to achieve optimum reception for
both high doppler echoes conditions and 0dB conditions
- The synchronization and the equalization algorithms are based on both training signals and blind
data
- It enables better channel tracking – resulting in achieving all A74 requirements
• Fast channel acquisition in 0dB conditions, < 0.5sec.
• Improves immunity to noise for Brazil ensembles over previous Zoran devices
• Improved phase noise rejection in 0dB conditions
•
NTSC demodulator
• Fully programmable digital video frequency and group delay equalization including internal digital
Nyquist filter and excellent sound carrier digital rejection (>60dB)
• Digital carrier recovery (AFT) with accurate report to host
• Digital carrier recovery without quadrature distortions