Front-End

• Front-end chipset
  • 調諧器(tuner)/TV Decoder
    • 負責將接收到的高頻訊號轉為中頻
  • 解調器(demodulator)
    • 轉為基頻供後端數位IC處理

Tuner

• 數位電視調諧器架構技術分析
• Silicon TV Tuners Will Replace Can Tuners as Transistors Replaced the Vacuum Tube

SAW(Surface Acoustic Wave) Filter

• Characteristics
  • Vestigial-sideband filter
    • for NTSC signals
  • Root-cosine/Roofing filter
    • for ATSC signals

• 封裝寄生效應對表面聲波元件效能的影響研究

Demodulator

• modulation method
  • 地面廣播
    • 8VSB(8-level vestigial sideband modulation)
      • ATSC A/53 requested
    • COFDM
      • 歐規與日規
  • 有線電視
    • QAM(Quadrature amplitude modulation)
      • QAM 64
      • QAM 256
        • ITU-T J.83 Annex B requested
  • 衛星廣播
    • QPSK

AFT(Automatic Fine Tuning)

• An automatic fine tuning (AFT) circuit used for processing an image intermediate frequency signal for a video display device. The AFT circuit, which produces an automatic fine tuning signal, by which an image intermediate frequency signal maintains a constant carrier center frequency, includes:
  • a phase shift device for performing a phase shift of 90° in the state of the constant carrier center frequency
    • includes a resonance circuit for performing the phase shift in relation to the image intermediate frequency signal.
  • a control current generating device for generating a control current in response to a variation of a variable resistor value
  • a resonant frequency variable device for varying a resonant frequency of the resonance circuit, by varying a capacitance to be resonated by the control current
  • a phase detecting device for multiplying the image intermediate frequency signal by a phase-shifted image intermediate frequency signal, and for generating the automatic fine tuning signal.

• THE PROBLEM OF AUTOMATIC FINE TUNING IN TV AND VIDEO RECORDERS
• Automatic fine tuning circuit for processing an image intermediate frequency signal
• NTE1174 - Integrated Circuit TV Automatic Fine Tuning (AFT) Circuit

Comb Filter

• Comb Filter
• 3D comb filter
  • Dot crawl

• Vendor
  • Toshiba
    • TC90A92AFG 3D Comb Filter Front-End Processor

• Service Multiplex and Transport Subsystem

Multiplexing Process

• PES(Program Elementary Stream)

Program Stream

TS(Transport Stream)

• MPEG Transport Stream
  • MPEG-2 Transport System
  • Introduction to MPEG-2 Compression and Transport Streams - DVB Overview
• DVB-T Transport Stream
  • DVB SI BASICS
• ATSC transmission
• ISO/IEC 13818-1 Second edition 2000-12-01
• ISO/IEC 13818-2
• Transport Stream Processor(TSP)

• Vendor

NXP

• NXP

• Tuner
  • Silicon Tuner
    • TDA8275
    • TDA18211
    • TDA18271

• IF demodulator
  • PAL-NTSC
    • TDA8290
  • DVB-T
    • TDA10046AHT

• Frond-end Module
  • FQD1236
    • (Tuner part)
    • TDA9885(IF demodulator)

TI

• TVP9900
  • 以更經濟方式實現高畫質DTV接收器
  • GC1012B 3.3V DIGITAL TUNER CHIP

Blonder Tonque

• ATSC/QAM Demodulator

Siano Mobile Silicon

• Siano Mobile Silicon
  • Front-End Module
    • SMS1000

Intel

• Tuner
  • CE5038
• Front-End Module
  • CE9517

MAXIM

• MAX3580