KR970012586A - CD-DSP device with a built-in CD-ROM decoder - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a CD-DSP device incorporating a DC-ROM decoder. An EFM demodulation unit for performing EFM demodulation of information data when an RF signal from a video disc is signal-processed by a digital PLL circuit 30 by a digital PLL method (32), a data bus (36) for forming the transmission path of data for causing the EFM demodulated information data input through the register (34) to be digitally processed and to be CD-ROM decoded, and synchronized from the information data. A timing generator 38 for detecting a signal and generating a timing signal according thereto, and a CLV processing unit 40 for generating a CLV control clock signal for causing the video disk to rotate at a constant speed at a CLV speed based on the generated timing signal. The error correction part 42 and the synchronization detection part 44 which correct | amend the data error of the information data transmitted by digital signal processing, and transmit information data on a frame basis, A timing generator 46 for generating a timing signal for CD-ROM decoding processing based on the existing signal, and decodes and decodes an arbitrary code sequence of the information data in byte units to generate information data in block units. Command register for storing various control commands through the descrambler unit 48 stored in the memory unit 17 through the memory controller 49 and the microcomputer interface 58 for interfacing the control commands from the microcomputer 18 ( 62), an internal register 57 for storing block-by-block decoding information by the decoder 55, and a FIFO unit 64 for sequentially inputting and outputting information data stored in the data memory 52 in sequence. And a host interface 66 for interfacing the information data through the FIFO unit 64 for MPEG decoding according to a control command from the command register 62. Characterized in that configured.

Description

CD-DSP device with a CD-ROM decoder

Since this is an open matter, no full text was included.

2 is a block diagram showing the configuration of a CD-DSP device incorporating a CD-ROM decoder according to the present invention.

Claims (1)

A video disc player for video / audio reproduction of information data read from a video disc, comprising: a digital PLL circuit (30) for processing an RF signal according to the information data from the video disc in a digital PLL scheme, and the digital PPL scheme The EFM demodulated information data, which is input through the register 34 through the data intermediation by the EFM demodulator 32 and the bus intermediate unit 50, which EFM demodulates the signal data processed by the digital signal processing, A data bus 36 which forms a transmission path for data to be CD-ROM decoded, a timing generator 38 which detects a synchronization signal from the information data and generates a timing signal accordingly, based on the generated timing signal CLV processing unit 40 for generating a CLV control clock signal for causing the video disk to rotate at a constant speed at a CLV speed, wherein the digital signal is processed. An error correction unit 42 for correcting a data error of the information data transmitted through the iterus 36 to transmit the information data in units of frames, and a synchronization detector 44 for detecting a synchronization signal in the digital signal processed information data A timing generator 46 for generating a timing signal for CD-ROM decoding processing based on the detected synchronization signal, and descrambles and decodes an arbitrary code sequence of the information data in units of bytes to block The descrambler unit 48 generates information data, the memory controller 49 performs a memory control operation for storing the decoded information data in the memory unit 17 in units of blocks, and corrects the CIRC error of the information data. The data memory 52 having a storage function for storing the address data for the information data stored in the data memory 52 controlled by the memory encoder 56. An address register 54 for providing the information, an internal register 57 for storing the decoded information decoded by the decoder 55 with respect to the block data, and a microcomputer interface for interfacing control commands from the microcomputer 18 ( 58), an instruction register 62 for storing various control commands through the microcomputer interface 58, and a FIFO unit for inputting and sequentially outputting information data stored through the memory controller 49; (64) and a host interface (66) for interfacing the information data through the FIFO unit (64) for MPEG decoding in accordance with a control command from the command register (62). CD-DSP device with a built-in ROM decoder. ※ Note: The disclosure is based on the initial application.