KR100209891B1 - Video player with cm skip function - Google Patents

Abstract

The present invention relates to a video player that skips and plays back a SI inserted into a recorded broadcast program in a video player for recording and playing back a broadcast program. The video player of the present invention includes a black frame detector for detecting a black frame from a video signal of a broadcast program input for recording, a silent detector for detecting silence in an audio signal of a broadcast program input for recording, and a black frame is detected. Each time a sound is detected or silence is detected, a sync mark of 1 cycle having a duty of 3: 7 is written into the control track of the tape, and the sync mark is grouped into 8 cycles at the group starting point according to the group length. Or rewriting the A mark having a length of 12 cycles, and writing the B mark of 24 cycles 50 seconds before the synchronization mark of the group end point is started, and according to the length of the A mark written in the control track at the time of reproduction. It consists of a microcomputer that controls the servo to skip the SIEM section at different speeds. Therefore, the present invention can reduce the skip time in the siem section according to the A mark length, and provides an effect that can be immediately switched to normal playback without position correction within 50 seconds after the B mark is detected.

Description

Video player with siem skip function

1 is a view for explaining the skip function of the CM (CM) in the conventional VCR (a) is a VASS (VASS) format according to the audio form, (b) is a position of the CM (CM) A diagram recorded in a VASS format in a stereo form, and (c) is a diagram for explaining skipping of a Siem part at a position recorded in a stereo bass format during playback.

2 is a block diagram showing a video player having a CM skip function according to the present invention.

3 (a)-(d) are diagrams for explaining the CM skip function in the player of FIG.

* Explanation of symbols for main parts of the drawings

21: tuner 22: black frame detection unit

23: silent detector 24: micom

25: servo unit 26: control head

27: motor

The present invention relates to a video player capable of recording and playing a broadcast program. More specifically, a commercial (CM) is inserted in the middle of a broadcast program and skips the commercial even if the commercial is recorded in a broadcast program that is desired to be recorded. A video player having a CM skip function that can be played while skipping.

In general broadcasting, a CM is inserted into a stereo in the middle of some programs such as sports and movies. Therefore, many prior arts have been proposed in which a function of recording and recording these signals to detect only the CM in playback (PB) and skipping to a mode such as search is performed. have. The method employed in Japan will be briefly described with reference to FIG.

1 is a view for explaining the skip function of the CM (CM) in the conventional VCR (a) is a VASS (VASS) format according to the audio form, (b) is a position of the CM (CM) A diagram is recorded in a stereo VASS format, and (c) is a diagram for explaining a skip of a siem portion at a position recorded in a stereo bass format during playback.

In the VCR, the bath signal of the corresponding format is recorded on the control track of the video tape whenever the initial recording or the audio format is changed. In particular, the bath signal is recorded in stereo format for the CM part of the broadcast program input for recording. Referring to FIG. 1 (a), when the audio of an input broadcast program is mono, a bath signal in the form of EEEE111111111EEEE is recorded, and in the case of stereo, a bath signal in the form of CCCC111111111CCCC is recorded. In the case of dual, a bath signal of the form DDDD111111111DDDD is recorded. Here, the English letters C, D, and E are hexadecimal numbers and represent binary numbers of 1100, 1101, and 1110, respectively. Binary 1 has a duty ratio of 3: 7 and 0 is recorded with a pulse of 6: 4. Referring to FIG. 1 (b), when audio is stereo when recording a broadcast program, the audio signal is recognized as a CM section, and a bass signal in stereo format is recorded at the start and end positions of the CM section. For the interval of, record a normal of 6: 4 duty. That is, C of 1100 is recorded four times in a row, 1 is recorded nine times in a row, and C of 1100 is recorded four times in a row. Referring to FIG. 1 (c), when the siem skip mode is turned on by the user during playback (PB), the CM signal start position (CM ON) of the stereo format is searched by searching for the format of the bath signal recorded on the control track. ) And end position (CM OFF) are detected. Here, it usually takes about 3 to 4 seconds to detect the start position CM ON and the end position CM OFF. When the start position of the CM is detected, the skip is performed until the end position of the SI is detected through the fast search FPS. At this time, since the detection of the end position of the Siem is performed at a position about 3 to 4 seconds past the end of the Siem, the tape is rewound (RPS) for about 3 to 4 seconds, and then the normal regeneration (PB) is performed.

Meanwhile, an object of the present invention is to recognize a siem by using a black frame that normally occurs before and after a siem section of a broadcast program, and audio is not present between the siem and the siem, unlike the above prior art. In addition, it provides a method of skipping this part during playback by marking the position of the SIEM on the video tape when recording.

In the video player having the CM skip function of the present invention for achieving the above object, in a video player for recording and playing back a broadcast program, a black frame is detected by a video player of a broadcast program input for recording. A black frame detection unit, a silent detection unit for detecting a silence in an audio signal of a broadcast program input for recording, and a siem every time a black frame is detected in the black frame detection unit or a silence is detected in the silent detection unit at the time of recording A microcomputer that recognizes the position of the Siem on the control track of the tape by recognizing it as a commercial, and recognizes the siem part by the mark in the data read from the control track through the servo unit, and controls the skipping of the siem part, when playing. And servo operation according to the control of the microcomputer to perform the servo operation. And writing a mark on the control track of the tape at the time of recording a song program, it includes a portion of skipping Siem the recorded broadcast program at the time of reproduction servo.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram showing a video player having a siem skip function according to the present invention. As shown, the player of the present invention includes a tuner 21 for receiving a broadcast program for recording, a black frame detector 22 for detecting a black frame by receiving a video signal VIDEO among the received broadcast programs, And a silent detector 23 for detecting a silent sound by receiving an audio signal AUDIO among the received broadcast programs. The player of the present invention also controls the overall operation of recording, playback, and the like, and when a black frame is detected or silence is detected during recording, it is recognized as a siem and controlled to mark the position of the siem, and the marked part is skipped during playback. The microcomputer 24 which controls so that it may be provided is provided. The microcomputer 24 is configured such that the servo unit 25 for servo operation under the control of the microcomputer 24 is connected to the control head 26 and the motor 27 which mark the position of the SIEM on the control track of the tape. .

The operation of the video player having the siem skip function of the present invention configured as described above will be described in detail with reference to FIG.

3 (a)-(d) are diagrams for explaining a siem skip function in the second-degree player, and show a process of marking a position of a siem (CM) on a control track.

In FIG. 2, a broadcast program for recording is received through the tuner 21, and a video signal VIDEO of the received broadcast program is input to the black frame detector 22, and the audio signal AUDIO is a silent detector ( 23). Referring to FIG. 3 (a), there is a CM section in which at least one commercial is loaded between the broadcast program and the program. Since a black frame of a black image is usually generated before and after the SIEM, the black frame detector 22 detects the black frame by comparing the luminance level of the input video signal VIDEO with a threshold level. On the other hand, since there is no audio between the SI and the SI, the silent detector 23 compares the level of the input audio signal AUDIO with a threshold level and detects silence. The microcomputer 24 controls the servo unit 25 every time a black frame or silent is detected during recording so that a special mark (hereinafter referred to as a sync mark) is written on the control track of the tape. The servo unit 25 performs servo operation under the control of the microcomputer 24 so that the motor 27 can drive the tape in accordance with a corresponding mode (for example, recording, playback, high-speed search, rewind,…). The mark is written so that the recording current flows through the control track of the tape on which the control head 26 runs. Referring to FIG. 3 (b), in the broadcast program of FIG. 3 (a), 1 having a duty cycle of 3: 7 is written into the control track four times for each position of the siem. At this time, if a black level exists in the broadcast program other than the SI, it is mistaken for the SI and the synchronization mark is written. Thus, the microcomputer 24 rewinds the tape through the servo unit 25 after the recording is completed. Then, the sync marks written on the control track are grouped. That is, the microcomputer 24 writes the marks (hereinafter referred to as A marks) in one group of sync marks written at the expected positions and changes the format according to the length of the group. Referring to FIG. 3 (c), when the group length is less than 3 minutes, the microcomputer 24 overwrites the A mark with 1 cycle of 8 having a duty of 3: 7 on the sync mark at the start of the group. On the other hand, in FIG. 3 (d), if the group length is 3 minutes or more, the microcomputer 24 overwrites the A mark with 1 cycle of 1 having a duty of 3: 7 above the sync mark at the start of the group. . Here, the different lengths of the A marks are for optimizing the skip speed during reproduction. In addition, the microcomputer 24 overwrites the B mark having 1 cycle of 24 with a duty of 3: 7 at the end point of the group. That is, referring to FIGS. 3 (c)-(d), the writing of the B mark, which is the end mark of the siem group, is actually performed in order to secure the time to enter the normal play (PB) mode by braking in the video player after skipping the siem group. 50 seconds before the end sync mark starts. On the other hand, during reproduction when the siem skip function is ON, the microcomputer 24 receives the data read from the control track of the tape through the control head 26 from the servo unit 25. If the input data is an A mark of 8 cycles or 12 cycles, the microcomputer 24 controls the servo unit 25 to skip through the high-speed search until a B cycle of 24 cycles is input. The servo unit 25 is controlled to perform normal reproduction again. At this time, the skip speed is controlled differently according to the length of the A mark.

As described above, the video player having the CM skip function of the present invention detects a black frame or a silent sound that normally occurs before and after the SI is inserted into a broadcast program, and recognizes the SI, and each time the SI is recognized. After sync mark, group it and write A mark length of group start point according to the group length to optimize skip speed during playback, and write B mark of group end point before a certain time to play normally without position correction Let this be done.

Claims (8)

A video player for recording and reproducing a broadcast program, the video player comprising: a black frame detector for detecting a black frame from a video signal of a broadcast program input for recording; a silence for detecting silence in an audio signal of a broadcast program input for recording Detection unit; Whenever a black frame is detected by the black frame detector or a silence is detected by the silent detector, it is recognized as a siem (commercial) and controlled to mark the position of the siem on the control track of the tape. A microcomputer that recognizes the siem portion by the mark in the data read from the control track and controls to skip the siem portion; And a servo unit for servo operation under the control of the microcomputer to write a mark on a control track of the tape when recording the broadcast program, and to skip the SI section during playback of the recorded broadcast program. Having a video player. The CM of claim 1, wherein the black frame detection unit detects a black frame that normally occurs before and after the SI in the broadcast program by comparing the luminance level and the threshold level of the video signal of the broadcast program. Video player with skip function. The system of claim 1, wherein the silent detector detects a portion in which no audio exists between the siem and the siem by comparing the audio signal level and the threshold level of the broadcast program. Having a video player. 4. The method of claim 2 or 3, wherein the microcomputer comprises: a first step of writing a sync mark having 1 to 4 cycles having a duty of 3: 7 on the control track whenever it is recognized as a SI during recording; Rewinding the tape after recording is completed and grouping the sync marks into two or more; A third step of writing an A mark having 1 cycle of 8 cycles or 12 cycles having a duty of 3: 7 at the group start point according to the group length; And a fourth process of writing a B mark having 1 to 24 cycles with a duty of 3: 7 at the group end point. The video player having the CM skip function of claim 4, wherein the second process of the microcomputer is grouped into sync marks written at an expected position. The video player of claim 4, wherein the third process of the microcomputer optimizes a skip speed during playback by varying the length of the A mark according to the group length. The method of claim 4, wherein the fourth process of the microcomputer writes a B mark 50 seconds before the start of the sync mark of the end of the group, and secures a time for switching to normal play after skipping the SIEM group during playback. Video player with skip function. The CM (CM) according to claim 4, wherein the micom skips at different speeds according to the length of the A mark when the A mark is read by the control track during playback, and switches to normal play when the B mark is read. Video player with skip function.