OMG...討論快爛掉了吧
http://www.pcdvd.com.tw/showthread.php?t=728515


Conexant 23418 :
"Single-Chip MPEG-2 Encoder with Integrated Analog Video/Broadcast Audio Decoder"
http://www.conexant.com/products/entry.jsp?id=150

The CX23418 increases upon the level of integration found in the CX23416 MPEG-2 encoder by adding a worldwide compatible broadcast audio/video decoder that supports NTSC/PAL/SECAM video standards and their associated stereo audio broadcast standards. By integrating the analog decoding functions that are typically spread across three chips into one chip, the CX23418 offers consumer electronics and personal computer companies a path to reduce the cost of designing and manufacturing their next-generation digital video products.

Features

* Supports MPEG-2 (MP@ML, SP@ML) and MPEG-1
* MPEG transport capture from digital TV demodulators
* Dolby Digital (AC-3) 2-channel
* Sampling rates of 32 kHz, 44.1 kHz, and 48 kHz with compressed bit rates up to 384 kb/sec
* 3-D adaptive comb filter with time-based correction
* Supports interlaced YPbPr inputs along with composite video and S-video
* Vertical blanking interval (VBI) data slicer
* Worldwide audio standards: BTSC, EIAJ, A2, NICAM, FM/AM Mono
* Two stereo audio processing blocks featuring three-band equalizer (EQ), volume, soft mute, auto volume control, and soft clipping functions
* AES, triple DES, and CPRM encryption

------------------------------------------------------------------------------------

Conexany 23417:
"MPEG-2 Audio/Video Encoder"
http://www.conexant.com/products/entry.jsp?id=455

The CX23417 encoder is one of the industry's lowest power MPEG-2 audio/video encoders. The versatile CX23417 actually incorporates the functionality of up to three different chips, allowing Conexant to deliver this device at a price point that will enable consumer electronics and personal computer companies to reduce dramatically the cost of designing and manufacturing their next-generation digital video products. Pre-filtering improvements in the CX23417 include built-in noise filters that dynamically improve images in the pre-processing stage. As a result, end-users obtain the best possible picture, even as the data rate is reduced and the recording time is lengthened. Other video quality improvements include an increased motion search range, the de-coupling of motion estimation from encoding, and an adaptive quantization scheme. To reduce the overall cost of the CX23417 and achieve the highest video quality, Conexant devoted significant engineering resources to determining the optimal balance between hardware and software implementation of these processing improvements.

Features

* High-quality real-time video encoding
* Supports MPEG-2 and MPEG-1
* Sampling rates of 32 kHz, 44.1 kHz, and 48 kHz
* Compressed bit rates up to 448 kbit/sec