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參數(shù)資料
| 型號： | LC74201JE |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP128 |
| 封裝： | QFP-128 |
| 文件頁數(shù)： | 21/21頁 |
| 文件大小： | 301K |
| 代理商： | LC74201JE |
5. Video decoder
This block decodes all layers (from the video sequence layer to the block layer plus the headers) from the MPEG1
video bit stream from the system decoder in accordance with the ISO11172-2 standard.
The decoding requires no external signal processing. The LSI internals handle everything automatically. All that is
required from outside the chip are simple commands and the MPEG bit stream.
A PLL circuit permits synchronization of the system clock with the CD digital signal processor. Commands offer a
choice of the following frequencies.
— 16.9344 MHz
— 2.8224 MHz
— 2.1168 MHz
The decoder supports the following image formats.
— 352 dots
× 240 lines, 29.97 Hz (NTSC, PAL-60 Hz)
— 352 dots
× 240 lines, 23.976 Hz (Film)
— 352 dots
× 288 lines, 25.00 Hz (PAL)
— 704 dots
× 480 lines, high-resolution still image (NTSC)
— 704 dots
× 576 lines, high-resolution still image (PAL)
Built-in filters provide high image quality.
— Built-in sampling rate conversion filter for horizontal direction
— Built-in vertical filter
The decoder supports a variety of video output specifications.
— Support for NTSC (59.94 Hz) and PAL (50 Hz) monitors
— Built-in video timing generator
— Switching between interlaced and non-interlaced operation
— Built-in YUV-to-RGB conversion matrix with choice of 24-bit RGB, 24-bit YUV, and 16-bit YUV output
— Film-to-NTSC conversion
— Simple two-way conversion between NTSC or Film and PAL with built-in aspect ratio conversion
— Choice of pixel clocks: 13.5 MHz, 6.75 MHz, and 4 fsc
The decoder offers special playback functions.
— Special playback functions require no signal processing by the CPU.
— Such functions as double-, triple-, and quadruple-speed playback, still image playback, pause, slow, and single-
stepping (one-cut play) are available with simple commands.
— The built-in multitile function offers the display of 4 or 16 small images on the screen with the display
positions freely selectable and processing of up to two fields supported.
— The built-in wipe function supports wiping within a frame, display outside that frame, and changing the frame
color.
— The built-in fade-in and fade-out functions.
The decoder includes bit buffer management functions.
— These monitor the bit buffer for errors and control the decoder to automatically adjust the amount of data in the
bit buffer to maintain normal operation at all times.
— Depending on the state of the bit buffer, the decoder automatically skips or repeats images. Skipping gives
precedence to B pictures.
The decoder includes frame buffer management functions.
These provide all internal support for frame buffer mapping control (for the display, reconstruction frame, front
frame, and rear frame) and the mapping control and setting accompanying mode changes between high-resolution
still images and motion picture playback.
The decoder includes various fail-safe functions.
The decoder supports version 2 of the video CD standard.
— User data is accessible from outside the decoder.
— The decoder supports superimposition of closed caption data on the output RGB/YUV signal as specified in the
EIA608 standard.
The decoder supports decoding of Photo CDs (using Base/4 and lower).
No. 5761-9/21
LC74201JE
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