KR19990027024U - Video compact disc player for high speed playback - Google Patents

Abstract

end. TECHNICAL FIELD OF THE INVENTION

The present invention relates to a video compact disc playback apparatus capable of high speed playback.

I. The technical problem that the invention is trying to solve

Minimize the frame-to-frame time during high speed playback on a video compact disc playback device.

All. Summary of solution of design

An EFM demodulation, a deinterleave, and A digital signal processor for descrambling and error correction and outputting a buffer; a buffer for receiving and buffering continuous frames according to a predetermined time interval during high-speed playback; and a plurality of continuous frames stored in the buffer during high-speed playback and reading the frame. An audio-video decoder which decodes only I frames among them and outputs them as video data, and receives and decodes the audio frames during high-speed playback from the digital signal processor at the time of the high-speed reproduction, and outputs them as audio data; Video from A key input unit including a video output unit for receiving and outputting a key, an audio output unit for receiving and outputting audio data from the audio-video decoder, a key for inputting a fast playback command of a user, and the key input And a controller for storing a predetermined number of consecutive frames according to a predetermined time interval among the frames from the digital signal processor in the buffer and controlling the audio-video decoder to read the consecutive frames stored in the buffer. It features.

la. Important uses of the devise

Used for video compact disc player.

Description

Video compact disc player for high speed playback

The present invention relates to a video compact disc (hereinafter referred to as "CD") playback device, and more particularly to a video compact disc playback device capable of high-speed playback.

A video CD reproducing apparatus is a device for reproducing an image using a CD in which video data is compressed and recorded. The format of the video CD is based on the CD-ROM format, and several others have been added. That is, the video CD format includes not only a lead-in area but also information necessary for playing the first track or disc. Therefore, the actual compressed video data is recorded from the second track.

In the case of Video CD version 2.0, users can select and view various contents according to the menu unlike the previous version. In particular, high speed playback is provided for the video CD version 2.0.

The conventional high speed playback method will be described in detail. The video data is compressed and coded into I, P, and B frames according to the amplifier method. The I frame is intraframe coded using only the screen information, the P frame is predictively encoded from an I frame or a P frame, and the B frame is bidirectionally predictive encoded. Compressed and encoded I, P, B frames are usually I, B, B, P, B, B, P, B, B, P, ... Are written to the CD in the order of. In high-speed playback, only the I frames at predetermined time intervals are decoded and output from the frames recorded over time.

When the user instructs high speed playback, the frames are read from the CD by optical pickup in this order and provided to the DSP (Digital Signal Processor) as an EFM signal. The DSP performs EFM demodulation, deinterleave, descrambling, error correction, and the like on the EFM signal to provide the frames to the AV decoder in the order described above. The AV decoder takes an I frame according to a predetermined time interval among frames input in the above order, decodes the I frame and outputs the I frame. Here, the AV decoder selects, decodes and outputs only I frames according to a predetermined time interval during high speed playback. Accordingly, the output from the AV decoder outputs frames according to a predetermined time interval among the recorded frames.

As described above, the AV decoder selects, decodes and outputs only I frames according to a predetermined time interval during high-speed playback. Accordingly, the AV decoder must wait until the frame to be decoded is inputted with the frames not to be decoded. Therefore, the AV decoder should wait until the I frame is input if frames other than the I frame are being input when the I frame is to be decoded and output. As a result, the video data output by the AV decoder during high-speed playback has a long time interval between frames.

As described above, the AV decoder conventionally selects, decodes, and outputs only I frames according to a predetermined time interval during high-speed playback. Accordingly, the AV decoder waits until the I frame is input when frames other than the I frame are input when the I frame is to be decoded and output, so that the time interval between the output frame and the frame is long, so that the user can play at high speed. There were some difficulties that did not fit.

Accordingly, an object of the present invention is to provide a video compact disc playback apparatus capable of high speed playback which minimizes the time interval between output frames during high speed playback.

1 is a block diagram of a video compact disc playback apparatus capable of high speed playback according to an embodiment of the present invention;

FIG. 2 is a flow chart illustrating a buffer control for the microprocessor of FIG.

3 is a control flowchart of an AV decoder for the microprocessor of FIG. 1 during high speed playback;

4 is a diagram illustrating frames output from the DSP of FIG.

The present invention for achieving the above object is a video compact disc, an optical pickup for reading information recorded on the video compact disc, a high frequency processor for amplifying and waveform-shaping the output from the optical pickup, and the high frequency processor A digital signal processor for outputting the output from the EFM demodulation, deinterleaving, descrambling, error correction, and the like; a buffer for receiving and buffering continuous frames according to a predetermined time interval in the high speed playback; Reads a small number of consecutive frames, decodes only I frames among the frames, outputs them as video data, and receives and decodes audio frames for high-speed playback from the digital signal processor at the time of the high-speed playback, and outputs the audio data. With a video decoder, A key having a video output unit for receiving and outputting video data from a video-video decoder, an audio output unit for receiving and outputting audio data from the audio-video decoder, and a key for inputting a fast playback command of a user When an input unit and the key are input, a predetermined number of consecutive frames according to a predetermined time interval among frames from the digital signal processing unit are stored in the buffer, and the audio-video decoder reads the continuous frames stored in the buffer. It is characterized by comprising a control unit for controlling.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail. In the following description and the annexed drawings, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent to those skilled in the art that the present invention may be practiced without these specific details. And a detailed description of known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted.

1 is a block diagram of a video compact disc player capable of high-speed playback according to a preferred embodiment of the present invention. An optical pickup 102 reads a CD 100 that records amplified coded video data. And outputs an RF signal accordingly. The RF signal is input to the RF processor 104, amplified and waveform-formed, and output as an EFM signal. The EFM signal is input to the DSP unit 106. The DSP unit 106 is composed of a DSP 108 and a buffer 110. The DSP 108 performs EFM demodulation, deinterleave, descrambling, error correction, and the like on the EFM signal. The buffer 110 is provided to the buffer 110 or provided to the AV decoder 112 under the control of.

The buffer 110 stores a predetermined number of consecutive frames from the DSP 108 under the control of the microprocessor 120 and provides them to the AV decoder 112. The AV decoder 112 decodes and outputs the frame from the DSP 108 under the control of the microprocessor 120, or decodes and outputs the frame from the buffer 110. The AV decoder 112 decodes the frame when the frame is an audio frame, and provides the decoding to the audio output unit 114. When the frame is a video frame, the AV decoder 112 outputs the frame to the video output unit 116.

The key input unit 118 includes keys for inputting various commands of the user and provides the microprocessor 120 with information corresponding to the key input. Alternatively, a remote controller having keys for inputting various commands of a user and a remote controller receiver for receiving a signal from the remote controller and providing the signal to the microprocessor 120 may be used instead of the key input unit 118.

The microprocessor 120 controls the parts of FIG. 1. The memory unit 122 stores a processing program and various kinds of information of the microprocessor 120. The display device 124 displays various types of information under the control of the microprocessor 120.

The high-speed playback operation of the video compact disc player will be described in detail with reference to FIGS. 2 and 3, which show a buffer control flowchart and an AV decoder control flowchart by the microprocessor 120. FIG.

When the user commands high-speed playback through the key input unit 118, the microprocessor 102 controls the optical pickup 102 to read information recorded on the video CD 100. Accordingly, the RF signal according to the information recorded on the video CD 100 is converted into an EFM signal through the RF processor 104 and input to the DSP 108. The DSP 108 processes and outputs the EFM signal, and the microprocessor 102 stores a predetermined number of consecutive frames among the frames processed and output by the DSP 108 according to FIG. 2 in the buffer 110. do.

In more detail, in step 200 of FIG. 2, the microprocessor 102 proceeds to step 204 according to the fast playback command of the user. In step 204, the microprocessor 120 stores a predetermined number of consecutive frames in a buffer. Here, at least one I frame should belong to the predetermined number of consecutive frames. When the storage of the predetermined number of consecutive frames is finished, it is searched whether a frame corresponding to a predetermined time elapses is output from the DSP 108. At this time, if a frame according to the elapsed time is output from the DSP 108, the process proceeds to step 208 to search whether the user commands the fast playback end. At this time, if the user commands the fast playback end, the microprocessor 120 terminates. Otherwise, the microprocessor 120 proceeds to step 204, and the predetermined number of consecutive frames are stored in the buffer 110 again. Referring to FIG. 4, which shows a memory map of the buffer 110, the buffer 110 includes a first frame. A predetermined number of consecutive frames according to the first time interval that is the Nth frame, and the Mth frame... The predetermined number of continuous frames according to the second time interval, which is the Lth frame, and the Kth frame. A predetermined number of consecutive frames according to the I time interval, which is the J-th frame, are sequentially stored. The time interval between each predetermined number of consecutive frames is a time interval skipped at high speed playback. At least one I frame should exist among a predetermined number of consecutive frames according to each time interval.

The microprocessor 120 provides the frames stored in the buffer 110 to the AV decoder 112 as described above, so that only one I frame is selected from the consecutive frames that the AV decoder 112 has previously estimated according to the time interval as described above. Control to decode.

In more detail, in step 300 of FIG. 3, the microprocessor 120 proceeds to step 304 in response to the fast playback command of the user. In step 304, the microprocessor 120 controls the AV decoder 112 to read the frames stored in the buffer 110. After the read, the microprocessor 120 proceeds to step 306 to control the AV decoder 112 to decode only the I frame of the read frames through the video output unit 116. While outputting the I frame as described above, the microprocessor 120 proceeds to step 308 to search whether the user commands the fast playback end through the key input unit 118. At this time, if the user does not command the fast playback termination, the microprocessor 120 proceeds to step 304 and continues reading and outputting the I frame stored in the buffer 110.

As described above, the present invention decodes and outputs only the I frames according to a certain time interval among frames recorded on the disk during high-speed playback, and after selecting a predetermined number of consecutive frames according to the predetermined time interval, the frames are deduced. Decode and output only I frames. As a result, the time between the output frames is reduced compared to the AV decoder which receives all the frames and waits until the I frame is input at a predetermined time interval. This effect is increased as the speed of the disk is increased.

As described above, the present invention decodes and outputs only the I frames according to a certain time interval among frames recorded on the disk during high-speed playback, and after selecting a predetermined number of consecutive frames according to the predetermined time interval, the frames are deduced. Decode and output only I frames. As a result, the AV decoder receives all the frames and waits until the I frame is input according to a predetermined time interval, and thus the time between the output frames is reduced compared to the decoding.

Claims (1)

In the video compact disc playback device capable of high speed playback, Video compact disc, An optical pickup for reading information recorded on the video compact disc; A high frequency processing unit for amplifying and waveform-shaping and outputting a signal from the optical pickup; A digital signal processor for outputting the output from the high frequency processor by EFM demodulation, deinterleaving, descrambling, error correction, and the like; A buffer for receiving and buffering continuous frames according to a predetermined time interval during the high speed playback; Read a few consecutive frames stored in the buffer during the high speed playback, decode only I frames among the frames, output them as video data, and receive and decode a predetermined high speed audio frame from the digital signal processor during the high speed playback. An audio-video decoder for outputting as audio data; A video output unit for receiving and outputting video data from the audio-video decoder; An audio output unit receiving and outputting audio data from the audio-video decoder; A key input unit having a key for inputting a high speed playback command by a user; A control unit for storing a predetermined number of consecutive frames according to a predetermined time interval among frames from the digital signal processor in the buffer when the key is input, and controlling the audio-video decoder to read the continuous frames stored in the buffer A video compact disc playback apparatus capable of high speed playback, comprising: a.