JP2000115713A - Video recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a video recording and reproducing device that can distinguish commercial message(CM) parts from other TV parts even when both the CM and the TV parts are recorded in the same broadcast mode. SOLUTION: A magnetic head 4 records a TV broadcast signal on a magnetic tape 1 from which the TV broadcast signal is reproduced. A silence part detector 11 detects silence parts from an audio signal in the TV signal when a recording reproducing means records the TV broadcast signal. A CM part detection means 13 detects CM parts in the TV broadcast signal at a time interval among the plural silence parts to be detected and a CM information storage circuit 12 stores the information of recorded positions of the CM parts detected by the CM part detection means to the magnetic tape 1. The CM parts at recording positions to the magnetic tape 1 are skipped and reproduced from the information of the recording positions of the CM parts to the magnetic tape 1 and stored in the storage circuit in the case of reproducing the TV broadcast signal from the tape 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video recording / reproducing apparatus, and more particularly to a video recording / reproducing apparatus which records and reproduces a television broadcast signal and distinguishes a commercial message portion from a program content portion in a broadcast program.

[0002]

2. Description of the Related Art When recording a television broadcast signal,
There is known a video recording / reproducing apparatus that distinguishes a commercial message portion and a program content portion from the television broadcast signal and deletes and records the commercial message portion. Such an apparatus is disclosed in, for example, JP-A-3-15
There are known a bilingual broadcast mode discriminating method described in JP-A-8086 and a stereo broadcast mode discriminating method described in JP-A-3-262287.

In the method described in Japanese Patent Laid-Open Publication No. Hei 3-158086, since a commercial message is broadcast in stereo, a bilingual broadcast mode included in an audio signal of a television broadcast is determined, and a bilingual broadcast mode is determined. And the commercial message portion of the stereo broadcast mode.
Only the part is automatically deleted, and the program content part in the bilingual broadcast mode is recorded.

In the method described in Japanese Patent Application Laid-Open No. 3-262287, a stereo broadcast mode included in an audio signal of a television broadcast is determined, and a program content portion in a stereo broadcast mode and a commercial message portion in a monaural broadcast mode are determined. In this case, only the commercial message part is automatically deleted, and the program content part in the stereo broadcast mode is recorded.

[0005]

However, in the above-described prior art, in the bilingual broadcast mode discrimination method, when the program content portion is a monaural broadcast program or a stereo broadcast program, the automatic transmission of the CM portion is performed. It cannot be deleted. Also, in the case of the stereo broadcast mode discrimination method, since it is assumed that the CM is originally a monaural broadcast, if the CM itself is a stereo broadcast, it cannot be distinguished from a stereo broadcast program.

Therefore, in the conventional method, two types of program contents are to be distinguished by a difference in a broadcast mode between a bilingual broadcast, a monaural broadcast, and a stereo broadcast. When the commercial message part is in the same broadcast mode, there is a problem that the two cannot be distinguished.

In particular, in recent years, the content of a program is not limited to a movie program, but also includes a bilingual broadcast and a stereo broadcast, such as a music program, a sports program, a drama program, and other general programs. In the method, the possibility that only the commercial message part can be deleted decreases,
It cannot be used practically.

An object of the present invention is to provide a video recording / reproducing apparatus capable of distinguishing a commercial message portion even when the broadcast mode is the same.

[0009]

In order to achieve the above object, the present invention has a recording / reproducing means for recording a television broadcast signal on a recording medium and reproducing the television broadcast signal from the recording medium. In the video recording / reproducing apparatus, at the time of recording the television broadcast signal by the recording / reproducing means, a non-voice part detecting means for detecting a non-voice part from an audio signal in the television signal; A commercial message part detecting means for detecting a commercial message part in the television broadcast signal by a time interval between the plurality of detected non-speech parts; and a commercial message part detected by the commercial message part detecting means. Storage means for storing information of a recording position on a recording medium; When the television broadcast signal is reproduced from the recording medium by the step, based on the information on the recording position of the commercial message part stored in the storage means on the recording medium, the commercial message part is transmitted to the recording medium. At the recording position, there is provided a control means for controlling reproduction from the recording medium so as to skip this commercial message portion and reproduce.

In the above-mentioned video recording / reproducing apparatus, preferably, further, when the recording / reproducing means records the television broadcast signal, a video signal detecting unit detects a change point of the video signal from the video signal in the television signal. Means, wherein the commercial message part detecting means comprises:
Based on a time interval between a plurality of no-sound portions detected by the non-sound portion detection means and the video signal detection means and a time interval between a plurality of change points of the video signal, It detects a commercial message part.

In the video recording / reproducing apparatus, preferably, the second commercial message part detecting means detects a point where the video signal level becomes a black level as a change point of the video signal. .

In the video recording / reproducing apparatus, preferably, the second commercial message part detecting means detects a point where the video signal level becomes a white level as a change point of the video signal. .

In the video recording / reproducing apparatus, preferably, the second commercial message portion detecting means detects a point at which the video signal level largely changes as a change point of the video signal.

In the above-described video recording / reproducing apparatus, preferably, the storage means is constituted by a semiconductor memory.

In the video recording / reproducing apparatus, preferably, the storage means is the recording medium on which the television broadcast signal is recorded by the recording / reproducing means.

In the video recording / reproducing apparatus, preferably, the information on the recording position of the commercial message portion, which is stored on the recording medium by the storage means, on the recording medium is stored at a head position of the recording medium. It was made.

In the video recording / reproducing apparatus, preferably, the information on the recording position of the commercial message part stored in the recording medium by the storage means on the recording medium is a plurality of televisions recorded on the recording medium. This is stored at the head position of each John signal.

[0018] In the video recording / reproducing apparatus, preferably, the information on the recording position of the commercial message part stored in the recording medium by the storage means on the recording medium is a plurality of televisions recorded on the recording medium. This is stored at the start position and the end position of the commercial message portion included in the John signal.

In the video recording / reproducing apparatus, preferably, when the recording / reproducing means records the television broadcast signal, a difference in a broadcast mode between a program content portion and a commercial message portion in the television signal is provided. A mode determining means for detecting a commercial message part in the television broadcast signal based on the commercial message part detecting means, wherein the commercial message part detecting means is detected by the soundless part detecting means, the video signal detecting means and the mode determining means. Detecting a commercial message part in the television broadcast signal on the basis of a time interval between a plurality of non-audio parts and a time interval between a plurality of video signal change points and a broadcast mode. It is.

In the video recording / reproducing apparatus, preferably, the first and second commercial message part detecting means determines that the part is a commercial message part when the detected time interval is substantially a multiple of N seconds. It is like that.

In the video recording / reproducing apparatus, preferably, the first and second commercial message part detecting means detects the commercial message part when two or more time intervals substantially equal to a multiple of N seconds are continuously detected. It is determined that there is.

[0022]

According to the present invention, when a television broadcast signal is recorded by the recording / reproducing means, a non-speech part detecting means for detecting a non-speech part from an audio signal in the television signal,
A commercial message part detecting means for detecting a commercial message part in a television broadcast signal by a time interval between the plurality of non-speech parts detected by the silent part detecting means; and a commercial message part detecting means for detecting the commercial message part in the television broadcast signal. Storage means for storing information on the recording position of the commercial message part on the recording medium, and when the television broadcast signal is reproduced from the recording medium by the recording / reproducing means, the commercial message part stored in the storage means is stored on the recording medium. Based on the information on the recording position, the recording position of the commercial message portion on the recording medium is provided with control means for controlling reproduction from the recording medium so as to skip and reproduce the commercial message portion. Of the unvoiced part of the Because that can be played while skipping commercial message portion using between intervals, even broadcast mode is the same, becomes capable of reproducing distinguishes commercial message part.

Further, when a television broadcast signal is recorded by the recording / reproducing means, a video signal detecting means for detecting a change point of the video signal from the video signal in the television signal is provided. A commercial message in a television broadcast signal based on a time interval between a plurality of non-voice portions detected by the non-voice portion detection means and the video signal detection means and a time interval between a plurality of transition points of the video signal. Since the part is detected, the commercial message part can be distinguished more accurately.

Further, the second commercial message part detecting means can easily distinguish the change points by detecting a point where the video signal level becomes a black level as a change point of the video signal. .

Further, the second commercial message part detecting means detects the point at which the video signal level changes to the white level as the changing point of the video signal, so that the changing point can be easily distinguished similarly to the black level. Becomes

Further, the second commercial message part detecting means can distinguish a change point including a fade-out part by detecting a point at which the video signal level largely changes as a change point of the video signal. Becomes

Further, the storage means can be made storable at the time of recording by comprising a semiconductor memory.

Further, the storage means is a recording medium on which the television broadcast signal is recorded by the recording / reproducing means, so that an existing recording medium can be used and a new storage means is not required. Become.

The information on the recording position of the commercial message portion on the recording medium, which is stored on the recording medium by the storage means, is stored at the head position of the recording medium, so that all information can be renewed even when overwriting. It can be rewritten.

Further, the information on the recording position on the recording medium of the commercial message part stored on the recording medium by the storage means is stored at the head position of each of a plurality of television signals recorded on the recording medium. Thereby, the rewind amount of the recording medium after the recording is completed can be reduced.

The information on the recording position on the recording medium of the commercial message part stored on the recording medium by the storage means is the head position of the commercial message part contained in a plurality of television signals recorded on the recording medium. And the end position, skip playback can be performed from the current position during playback.

Further, when the television broadcast signal is recorded by the recording / reproducing means, the commercial content in the television broadcast signal is based on the difference in the broadcast mode between the program content portion and the commercial message portion in the television signal. The provision of the mode discriminating means for detecting the message portion enables the commercial message portion detecting means to detect the time interval between the plurality of non-speech portions detected by the non-speech portion detecting means, the video signal detecting means, and the mode discriminating means. By detecting the commercial message portion in the television broadcast signal based on the time interval between the transition points of the video signal and the difference in the broadcast mode, the commercial message portion can be distinguished with higher accuracy.

The first and second commercial message part detecting means can easily detect the commercial message part by determining that the commercial message part is present when the detected time interval is substantially a multiple of N seconds. It can be distinguished.

Further, the first and second commercial message part detecting means determines that the message is a commercial message part when two or more time intervals substantially equal to a multiple of N seconds are continuously detected. The commercial message portion can be accurately distinguished.

[0035]

An embodiment of the present invention will be described with reference to FIG. FIG. 1 is a block diagram of a video recording and reproducing apparatus according to an embodiment of the present invention.

Two magnetic heads 4 are mounted on the rotary cylinder 5. The magnetic tape 1 is wound around a rotary cylinder 5, and a television broadcast signal is recorded and reproduced by the magnetic head 4. Two magnetic heads 4
Is used by being switched by the magnetic head changeover switch 6, thereby obtaining a temporally continuous reproduced signal. Here, the magnetic head changeover switch 9 selects and switches the reproduction signal on the side in contact with the magnetic tape 1 in accordance with which of the two rotary heads is in contact. At this timing, a magnetic field generated by a magnet (not shown) attached to the rotating cylinder 5 is detected by a sensor (not shown).
In general, it is obtained by detecting the above.

The magnetic tape 1 is usually fed at a constant speed, and this speed is controlled by a capstan 2 arranged opposite the pinch roller 3. The magnetic tape drive motor 8 is used to drive the capstan 2 and the take-up reel that winds up the magnetic tape 1, and the number of rotations is controlled according to a mode such as normal running or fast-forward running of the magnetic tape 1. You.

On the magnetic tape 1, a control pulse for use in various controls is recorded in addition to a normal television broadcast signal.
This is performed using the control pulse head 7. The control pulse is recorded every 1/30 seconds.

Here, a case where a television broadcast signal including a CM is recorded will be described.

The television broadcast signal is transmitted to the antenna 21
And supplied to the tuner 20. Tuner 20
In, a desired program is selected. The program selected by the tuner 20 is converted by the audio signal processing circuit 10 and output as an audio signal of an RF signal, and is alternately sent to the two magnetic heads 4 via the magnetic head switch 9. And recorded on the magnetic tape 1. The video signal is converted by a video signal processing circuit 17 and output as a baseband video signal. The video signal is sent to two magnetic heads 4 alternately via a magnetic head switch 9 and recorded on the magnetic tape 1. Is done.

Simultaneously with the start of recording, the tape position information read / write circuit 1
At 4, the identification number of the tape is recorded on the magnetic tape 1 via the magnetic head 4 together with the time code or the like as the position information of the tape. This information is coded and written, for example, in each V blanking portion of the video signal. The tape identification number is a number for which 99 titles are forcibly assigned to each magnetic tape in accordance with an instruction from the microcomputer 13.

On the other hand, the signal output as the audio signal in the audio signal processing circuit 10 is output to the audio signal level detector 9.
Supplied to The audio signal level detector 9 detects the level of the audio signal level. Audio signal level detector 9
Is composed of, for example, a smoothing circuit, and extracts a DC signal by smoothing a low-frequency audio signal.

The level of the level detected by the audio signal level detector 9 is supplied to the non-audio portion detector 11. The non-voice portion detector 11 detects a point where the voice signal level becomes near zero, and supplies a detection signal to the microcomputer 13. The non-voice portion detector 11 is constituted by, for example, a comparison circuit, sets the reference voltage to 0 V or a level slightly higher than the reference voltage, compares the level of the input voice signal with this reference voltage, and determines the level of the voice signal. Is higher than the reference voltage, a level "1" is output. Here, by incorporating a knot circuit in this circuit, the level "1" may be output when the level of the audio signal is lower than the reference voltage.

The output of the silent part detector 11 is taken into the microcomputer 13. The microcomputer 13 stores the time of the current detection signal supplied from the silent part detector 11 and the position information of the tape supplied from the tape position information read / write circuit 14, and detects the detection signal from the time of the next detection signal. Is measured, and if the interval between the current detection signal and the next detection signal is a fixed time interval, it is determined that the CM is CM. The tape position information is time code information corresponding to an absolute address (absolute time) from the head position of the tape and X minutes, Y seconds, and Z frames. A method of determining that the commercial is a CM will be described later with reference to FIG.

Although the silent part detector 11 has been described as a circuit having a configuration different from that of the microcomputer 13,
Since the recent microcomputer 13 has a built-in A / D converter of a plurality of channels, the signal of the audio signal level detector 9 is directly taken into the microcomputer 13 to perform an A / D change. Thus, the silent section may be detected by comparing with the reference voltage in the microcomputer 13.

On the other hand, the video signal processing circuit 17 supplies a signal output as a baseband video signal to the video signal level detector 16. The video signal level detector 16 changes points such as a point at which the video signal level fades out to a black level or a white level, a point at which the signal level of the screen is averaged, and the signal level largely changes (scene switching point). Is detected. Video signal level detector 1
Reference numeral 6 includes, for example, a frame integration circuit.
The frame integration circuit outputs a vertical synchronizing signal (V
-Sync) and integrates the video signal for one frame. Thus, the average level of the video signal of one frame of the video signal is obtained, and the level of the video signal is detected. Video signal level detector 16
The magnitude of the level of the video signal detected by the above is supplied to the video signal detector 18.

The video signal detector 18 compares the obtained average level with a reference voltage of a comparison circuit. Here, by setting the voltage slightly higher than the black level as the reference voltage, if the frame-integrated signal is higher than the reference voltage, the comparison circuit determines that the signal is at the black level and outputs it. Of course, if the signal obtained by frame integration using the knot circuit is lower than the reference voltage, the comparison circuit may output the signal.

By setting the reference voltage to a voltage slightly lower than the white level, when the frame-integrated signal is higher than the reference voltage, the comparison circuit determines that the signal is at the white level and outputs it.

In order to detect a point at which the signal level changes greatly (a point at which the scene is switched), the video signal detector 1
As 8, a differential circuit and a comparing circuit may be used, the signal level may be differentiated by the differentiating circuit, and whether or not the differential value is larger than a reference value may be detected by the comparing circuit.

In the United States, it is common to fade out before and after a commercial message portion, and in Japan, scene switching is common. However, in Japan,
It may fade out, and in such cases,
The point where the signal level changes greatly (the point where the scene switches)
In the case of fading out, the level of the signal changes before and after the fade-out.
The determination can be made in the same manner as when the scene is switched.

In the above description, the video signal for one frame is integrated. However, it is not always necessary to integrate the video signal for one frame. In short, a change point of a scene may be detected. May be integrated only in the vicinity of the center. For example, from the 100th to 150
In order to integrate video signals for the first horizontal scanning line, a trigger is activated to operate the integration circuit a predetermined time after this signal based on the vertical synchronization signal (V-sync).
Thereafter, the integration operation may be performed for a predetermined time.

Although the comparison circuit has been described as a circuit having a configuration different from that of the microcomputer 13, recent microcomputers 13 have a plurality of channels of A / A.
Since a D converter is built in, the signal of the integration circuit is directly taken into the microcomputer 13 to perform an A / D change, and then compared with a reference voltage in the microcomputer 13 or between the frames. Or the average level of the video signal may be compared to detect a change point of the video signal.

The video signal detector 18 supplies a detection signal to the microcomputer 13. The microcomputer 13 measures the time interval of the detection signal from the time of the current detection signal supplied from the video signal detector 18 and the time of the next detection signal, and calculates the time interval between the current detection signal and the next detection signal. If the interval is a constant interval, it is determined to be a CM. A method of determining that the commercial is a CM will be described later with reference to FIG. The microcomputer 13 also stores the tape position information supplied from the tape position information read / write circuit 22 at the same time that the detection signal based on the audio signal and the video signal is output.

According to the characteristics of the audio signal and the video signal, when the CM is determined by using both the determination based on the signal of the non-voice portion and the determination based on the changing portion or the fade-out portion of the video signal, the start of the CM and the CM Information of the end of the tape and the tape identification number are stored in the CM information storage circuit 1.
Feed to 2. The CM information storage circuit 12 stores a tape identification number and tape position information as CM information. This C
The CM information storage circuit 12 that stores M information includes, for example, E
A semiconductor memory such as an EPROM or a RAM or a magnetic tape may be used. That is, at the time of recording, the CM position information is sequentially stored in the CM information storage circuit 12 while recording the program.

As described above, while the CM is being judged, the audio signal and the video signal are recorded on the magnetic tape 1 via the magnetic head 4 in the same manner as in a normal video signal recording device. Have been. At this time, all the program contents and the commercial message are recorded without deleting and recording the CM as described in the related art. Then, at the time of reproduction, the commercial message portion is skipped and reproduced.

Next, a case where a recorded program is reproduced will be described. During reproduction, the tape position information and the tape identification number written on the magnetic tape 1 are read out by the tape position information read / write circuit 14. The read tape position information and tape identification number are supplied to the microcomputer 13. The microcomputer 13 refers to the CM position information of the tape being reproduced stored in the CM information storage circuit 12 based on the tape identification number.

The microcomputer 13 distinguishes the CM portion and the program portion from the tape position information being reproduced, based on the CM position information referred to from the CM information storage circuit 12, and
At the M portion, the tape drive circuit 15 is instructed to perform fast-forward or quick-view reproduction so as to skip the CM portion.

In the fast forward mode, the video signal and the audio signal cannot be reproduced from the magnetic tape 1, and the original commercial message portion or the program content portion is skipped from the screen of the television receiver. On the other hand, it is unknown whether it is a fast-playing video, but it appears temporarily as a screen, so whether the commercial message part is skipped or the program content part is skipped Since the user can identify whether or not the user is present, it is preferable to perform quick-view reproduction for such needs.

The tape drive circuit 15 drives the motor 8 in accordance with the instruction to cause the magnetic tape 1 to run at high speed. The microcomputer 13 calculates the number of control pulses existing from the CM start position to the CM end position from the CM information, and measures the control pulses supplied from the control pulse read / write circuit 22 from the CM start portion. When the number of measured control pulses reaches the number existing in the CM portion, the microcomputer 13 instructs the tape drive circuit 15 to stop the fast-forward or quick-view reproduction and return to the standard reproduction. The tape drive circuit 15
The motor 8 is driven to cause the magnetic tape 1 to perform standard reproduction traveling. During high-speed running, the position information cannot be read from the magnetic tape 1, so the control pulse is used to measure the moving distance of the tape (the time of the CM portion).

The subsequent CM portion is skipped in the same manner. As described above, the CM part and the program part are distinguished,
Only CM is skipped. CM skip on / off
The switch 23 determines whether or not to skip the CM according to the user's judgment. When the switch is on, an ON signal is supplied to the microcomputer 13, and the microcomputer 13 performs the above-described CM skip. Instruct the tape drive circuit. When this switch is off, the off signal is sent to the microcomputer 13
Is supplied to the microcomputer 13 and the above-described CM
Without skipping, the commercial message portion is reproduced in the same manner as the program content portion.

The broadcast mode discriminator 24 is a CM discriminating means based on the broadcast mode discrimination described in the prior art. Based on the fact that the commercial message portion is a stereo broadcast, another bilingual broadcast program or monaural It is determined from the broadcast program. This broadcast mode discriminator 24
Performs only the discrimination of the commercial message portion, and does not delete the record based on the signal of the broadcast mode discriminator 24. This broadcast mode discriminator 24
Is converted to a non-audio part detector 11 and a video signal detector 1
When used in combination with 8, it is possible to perform more accurate CM discrimination.

Next, a CM discriminating method will be described with reference to FIG.

In FIG. 2, a thick solid line indicated as a recording signal indicates a time axis. At the timing of the downward arrow described above the recording signal, a portion where the audio level becomes zero (a non-voice portion) is detected by the non-voice portion detector 11 and taken into the microcomputer 13.
Here, the times t ₁ , t ₂ , t ₃ , t ₄ , t ₅ , t ₆ , t ₇ ,
_{t 8, t 9, t 10} , voiceless portion t ₁₁ is detected.
The microcomputer 13 sets each time interval as
measure.

CMs are produced at regular intervals (15 seconds or a multiple of 15 seconds, for example, 15 seconds, 30 seconds, 60 seconds).
Second), and utilizing the fact that there is a non-voice portion before and after the CM, a portion where the interval between the non-voice portions is constant is determined as a CM portion. Naturally, there is a non-speech portion in the program portion, but the interval is not constant unless it is intended. If at least the interval of the non-voice portion is equal to or longer than a certain interval or equal to or less than a certain interval, it is determined to be a program. The non-voice portion is measured inside the microcomputer 13 during recording of the program on the magnetic tape 1, and is sequentially stored in the CM information storage circuit 12 from the microcomputer 13 and marked. Is re-edited, the program portion and the CM portion are distinguished and stored in the CM information storage circuit 12.

The time interval between non-voice portions is not exactly 15 seconds. This is because the time itself of the non-speech part is usually about 500 ms or more. This time depends on the commercial, but at least 200
ms. Therefore, the time interval between silent parts is 1
In the case of 4.5 to 15.0 seconds, in the case of 29.5 to 30.0 seconds, and in the case of 59.5 to 60.0 seconds, it is determined to be a CM portion. If this time interval is extended, it can be determined that the CM portion is a CM portion even when the time interval of the CM portion is short, but in that case, the original program content portion may be erroneously determined as the CM portion.

Here, the measurement of the time interval by the microcomputer 13 is performed, for example, by (t ₂ −t ₁ ) = 50 sec.
c, (t ₃ −t ₁ ) = 65 sec, (t ₃ −t ₂ ) = 15 s
ec, (t ₄ −t ₂ ) = 30 sec, (t ₄ −t ₃ ) = 15
sec, (t ₅ over _{t 2) = 45sec, (t} 5 over t ₃₎ = ₃
0 sec, (t ₅ over _{t 4) = 15sec, (t} 6 -t 2) =
115 sec, (t ₆ −t ₃ ) = 100 sec, (t ₆ −
(t ₄ ) = 85 sec, (t ₆ −t ₅ ) = 70 sec, (t ₇
−t ₆ ) = 15 sec, (t ₈ −t ₆ ) = 30 sec,
(T ₈ −t ₇ ) = 15 sec, (t ₉ −t ₆ ) = 38 sec
c, (t ₉ −t ₇ ) = 23 sec, (t ₉ −t ₈ ) = ₈ sec
c, (t ₁₀ −t ₆ ) = 53 sec, (t ₁₀ −t ₇ ) = 38
sec, (t ₁₀ −t ₈ ) = 23 sec, (t ₁₀ −t ₉ ) =
15 sec, (t ₁₁ −t ₆ ) = 64 sec, (t ₁₁ −
(t ₇ ) = 49 sec, (t ₁₁ −t ₈ ) = 34 sec, (t
₁₁ −t ₉ ) = 26 sec, (t ₁₁ −t ₁₀ ) = ₁₁ sec
It is performed as follows.

That is, not only the adjacent non-voice portion but also the time interval between the adjacent non-voice portion and the adjacent non-voice portion are measured. This is because a commercial message part of 15 seconds or a multiple of this time may also include a silent part. Therefore, it is not possible to determine the commercial message part only by the time interval between adjacent silent parts. It is. Therefore, for the non-audio portion of the time t _1, the time t _2, t ₃
And measure the time difference. On the other hand, if the time interval between the non-speech part and the non-speech part exceeds 60 seconds, there is no commercial message part having a length of 60 seconds or more. Is not measured. That is, when the time difference from the time t ₃ is measured for the non-voice portion at the time t ₁ , the subsequent time difference is not measured.

In FIG. 2, a downward arrow above a non-speech portion indicates a video signal change portion. That is,
The signal level on the screen is averaged, and the time interval at the point where the signal level changes greatly (scene switching point) is measured in the same manner as the measurement of the time interval in the non-voice portion described above.
As is clear from FIG. 2, the time interval of the video signal change portion is shorter than the time interval of the non-voice portion. The video signal change portion is measured inside the microcomputer 13 while the program is being recorded on the magnetic tape 1, and the interval portion is re-edited successively or after the recording is completed to distinguish the program portion from the CM portion. The microcomputer 13 can accurately determine the commercial message portion by taking the AND condition of the non-voice portion and the video signal change portion.

As a change point of the video signal, a point where a composite signal, a luminance signal, a color difference signal, or the like fades out to a black level or a white level can be used. The arrow described is
This shows a fade-out portion.

In a broadcast signal in Japan, a silent portion is generally formed before and after a commercial message portion. In a broadcast signal in the United States, a fade-out portion is generally formed before and after a commercial message portion. In a recording apparatus used in the United States, a method using a fade-out portion is effective.

Furthermore, the time interval of the silent portion appearing from time t ₉ to time t ₁₀ is 15 seconds, which cannot be discriminated using the silent portion detector 11 or the video signal detector 18 described above. . However, the commercial message part of 15 seconds is rarely present in one shot, and
One or four commercial message parts appear successively. Therefore, when a 15-second no-sound portion is detected, it is determined whether the portion is a commercial message portion or a program content portion depending on whether or not there is a 15-second no-sound portion that follows before and after. Time t
As for non-audio portion appearing at a time t ₁₀ from _9, silent portions of the previous is 8 seconds, also silent portion subsequent judges that the program content portions from being a 11 sec .

Also, by calculating the logical sum of the fade-out portion signal and the non-voice portion signal, the non-voice portion appearing from time t ₉ to time t ₁₀ can be determined to be the program content portion.

In addition to the above method, the mode discriminator 2
By using 4 together, it is possible to determine the CM portion.

In the method of detecting a video signal change portion, not only the switching of the screen but also the fade-out can be determined, so that a more accurate determination can be performed.

On the other hand, as apparent from FIG. 2, in the method of detecting the changed portion of the video signal, the amount of data is large and the load on the microcomputer 13 is increased. The method of detecting a fade-out portion is more preferable. In particular, this fade-out method is effective in the United States.

According to this embodiment, during recording of a program, the interval between singular points of an audio signal or a video signal is measured, whereby
A distinction can be made between a commercial message portion and a program content portion, and furthermore, during the reproduction of a program, the CM portion can be skipped by the information of the CM portion calculated and calculated at the time of recording.

Also, since the CM information is stored in a storage circuit inside the apparatus main body, skip reproduction can be easily performed by checking the contents of the storage circuit.

Further, by detecting a non-voice portion of the voice signal,
Since the commercial message portion is determined, the CM portion can be determined relatively easily.

Since the commercial message portion is also determined from the video signal, the CM portion can be determined more accurately.

Further, when the commercial message portion is determined from the video signal, the commercial message portion can be determined with higher accuracy by using the changed portion of the video signal.

Further, when a commercial message portion is determined from a video signal, by using a fade-out portion of the video signal, the processing can be simplified as compared with a case where a changing portion of the video signal is used.

Further, the accuracy is further improved by performing the discrimination based on the broadcast mode.

Next, another embodiment of the present invention will be described with reference to FIG. FIG. 3 is a block diagram of a video recording and reproducing apparatus according to another embodiment of the present invention. The same reference numerals as those in the embodiment of FIG. 1 indicate the same parts.

The difference from the first embodiment is that no CM judging means based on a video signal is used.

First, a case where a magnetic tape is inserted to record a television broadcast in which a CM is present will be described. The radio wave of the television broadcast is input to the antenna 21 and supplied to the tuner 20. In the tuner 20, a desired program is selected. The program selected by the tuner 20 is output as an audio signal in the audio signal processing circuit 10. The video signal is output as a video signal in the video signal processing circuit 17. When recording the audio signal and the video signal on the magnetic tape 1, the audio signal and the video signal are supplied to the switch 6 and are recorded on the magnetic tape 1 by the magnetic head 4. Simultaneously with the start of recording, the tape position information read / write circuit 14 records the identification number of the tape on the magnetic tape 1 together with the time code or the like as the position information of the tape. This information is coded and written in, for example, a blanking portion of the video signal.

On the other hand, in the audio signal processing circuit 10, the signal output as the audio signal is output to the audio signal level detector 9.
To supply. The audio signal level detector 9 detects the magnitude of the level of the audio signal and supplies the magnitude of the level to the non-speech part detector 11. The non-voice portion detector 11 detects a point at which the voice signal level becomes close to zero, and supplies a detection signal to the microcomputer 13.

The microcomputer 13 stores the time of the current detection signal supplied from the silent part detector 11 and the position information of the tape supplied from the tape position information read / write circuit 14, and stores the time of the next detection signal. , The time interval of the detection signal is measured, and if the interval is constant, C
It is determined that it is M. The microcomputer 13 stores the tape position information supplied from the tape position information read / write circuit 22 at the same time that the detection signal based on the audio signal is output.

If it is determined from the audio signal that the commercial is a commercial,
The tape position information and the tape identification number of the start of CM and the end of CM are supplied to the CM information storage circuit 12. The CM information storage circuit 12 stores a tape identification number and tape position information as CM information. The CM information storage circuit 12 for storing the CM information may be, for example, a semiconductor memory such as an EEPROM or a RAM, or a magnetic tape. That is, at the time of recording, the CM position information is sequentially stored in the CM information storage circuit 12 while recording the program.

Next, when reproducing the recorded program,
The tape position information and the tape identification number written on the magnetic tape 1 are read by the tape position information read / write circuit 14. The read tape position information and tape identification number are
It is supplied to the microcomputer 13. The microcomputer 13 refers to the CM position information of the tape being reproduced stored in the CM information storage circuit 12 by the tape identification number.

The microcomputer 13 distinguishes the CM portion and the program portion from the tape position information being reproduced based on the CM position information referred to from the CM information storage circuit 12,
At the M portion, the tape drive circuit 15 is instructed to perform fast-forward or quick-view reproduction so as to skip the CM portion. The tape drive circuit 15 drives the motor 8 according to the instruction, and causes the magnetic tape 1 to run at high speed.

The microcomputer 13 calculates the number of control pulses existing from the CM start position to the CM end position based on the CM information, and measures the control pulses supplied from the control pulse read / write circuit 22 from the CM start portion. When the measured number of control pulses reaches the number existing in the CM portion, the microcomputer 13 instructs the tape drive circuit 15 to stop the fast-forward or quick-view reproduction and return to the standard reproduction, and the tape drive circuit 15 To drive the magnetic tape for standard reproduction. The subsequent CM portion is skipped in the same manner. As described above, the CM part and the program part are distinguished
Only skip.

According to the present embodiment, the distinction between the commercial message portion and the program content portion can be distinguished by measuring the interval of the singular point of the audio signal during the recording of the program, and the program can be reproduced. In addition, the CM part can be skipped based on the information of the CM part calculated and obtained at the time of recording.

Although the number of elements for judging the CM is reduced as compared with the first embodiment, the circuit size can be reduced, and the memory for storing the information of the singular point when judging the CM is also reduced. it can.

Further, since the CM information is stored in a storage circuit inside the apparatus main body, skip reproduction can be easily performed by checking the contents of the storage circuit.

Further, by detecting a non-voice portion of the voice signal,
Since the commercial message portion is determined, the CM portion can be determined relatively easily.

[0096] Further, the discrimination based on the broadcast mode is also performed, so that the accuracy can be further improved.

Next, another embodiment of the present invention will be described with reference to FIG. FIG. 4 is a block diagram for explaining another embodiment of the present invention. The same reference numerals as those in the embodiment of FIG. 1 indicate the same parts.

The difference from the first embodiment is that the means for storing CM information is written not on an external storage means such as a semiconductor but on a magnetic tape or the like on which a program is recorded.

As described in the first embodiment, when recording a program, the microcomputer 13 determines the CM based on the audio signal and the video signal. After recording is completed, the microcomputer 13 instructs the tape drive circuit 15 to rewind the tape in order to record the determined position information of the CM on the magnetic tape 1. The tape drive circuit 15 drives the motor 8 to rewind the magnetic tape 1 and records CM information by the CM information read / write circuit 19. At the time of reproduction, first, the CM position information of the magnetic tape 1 is read by the CM information read / write circuit 19, and the information is stored in the microcomputer 13, and the tape position information read / write circuit 14 is read from the magnetic tape 1 during reproduction of the program. CM by comparison with tape position information read by
When it becomes a part, the CM part is skipped by fast forward or the like.

The position where CM information is recorded will be described with reference to FIG.

FIG. 5 is a schematic diagram of a magnetic tape 1 according to another embodiment of the present invention in a longitudinal direction, showing a control track portion and a portion for recording a video signal.

In the example of FIG. 5, a portion for storing CM information is provided at the beginning of the winding of the magnetic tape 1, and CM information of all programs is stored therein. In the case of this example, the information of the program A and the program B is recorded at the head part (hatched part). A CM position information start signal is recorded on the control track at the beginning of the magnetic tape 1, and following the CM position information start signal, a C
M position information is recorded. A head signal is recorded in the first control track of each of the programs A and B.

The recorded contents of the CM position information are information on the CM portions located between the programs A and B as shown in FIG. That is, for the program A, the information on the time length of the program A-1, the information on the time length of the following CM, the information on the time length of the program A-2, the information on the time length of the following CM, the program It is the information on the time length of A-3. Further, the information on the time of the program B-1, the information on the time of the CM following the information on the program B, the information on the time of the program B-2, and the information on the time of the CM following the program B are collectively collected. Recorded.

At the time of reproduction, the magnetic tape 1 is once rewound to the head position, and the CM position information start signal is detected.
Thereafter, the CM position information of the magnetic tape 1 is read out by the CM information read / write circuit 19 by normal reproduction, the information is stored in the microcomputer 13, and the tape position information read / write circuit 14 is read from the magnetic tape 1 during reproduction of the program. C by comparison with the tape position information read by
At the M portion, the CM portion is skipped by fast-forwarding or the like.

According to the present embodiment, once the first CM information is read, the CM information of all programs can be grasped.

Further, since the CM information is recorded at the head of the tape, all the CM information can be rewritten again when overwriting is performed.

FIG. 6 is a schematic view of another example of the magnetic tape 1 in the horizontal longitudinal direction in another embodiment of the present invention, showing a control track portion and a portion for recording a video signal.

In the example of FIG. 6, CM information is recorded at the head of each recorded program. In the case of this example, the information of the program A and the program B is recorded at the head portion (hatched portion) of the program A and the program B, respectively. At the beginning of each program on the control track of the magnetic tape 1, CM
A position information start signal is recorded. Following the CM position information start signal, the CM position information is recorded in the main body recording portion of the magnetic tape 1. A head signal is recorded in the first control track of each of the programs A and B.

The recorded contents of the CM position information are information on the CM portions located between the programs A and B as shown in FIG. That is, for the program A, information on the time length of the program A-1, information on the time length of the following CM, information on the time length of the program A-2, information on the time length of the following CM, It is the information on the time length of A-3. For the program B, information on the time length of the program B-1, information on the time length of the following CM, information on the time length of the program B-2, and information on the time length of the following CM are recorded. Have been.

At the time of reproduction, the magnetic tape 1 is rewound to the start position of each program, a CM position information start signal is detected, and thereafter, the CM position information of the magnetic tape 1 is read and written by the normal reproduction. 19, the information is stored in the microcomputer 13 and
When the CM portion is reached by comparison with the tape position information read from the magnetic tape 1 by the tape position information read / write circuit 14 during reproduction of the program, the CM portion is skipped by fast-forwarding or the like.

According to the present embodiment, since it is only necessary to rewind to the beginning of each program, the amount of rewinding is smaller than in the above-described example, and the operability is good.

In this case, the amount of rewinding of the tape after the recording is completed can be minimized. However, if you overwrite, C
M information may be lost.

On the other hand, in the example shown in FIG. 5, since it is the head of the tape, all the CM information can be rewritten again even when overwriting is performed.

FIG. 7 is a schematic diagram of another example of the magnetic tape 1 in another embodiment of the present invention in the horizontal longitudinal direction, and shows a control track portion and a portion for recording a video signal.

In the example of FIG. 7, the CM for each recorded program is
A CM start signal and a CM end signal are recorded as CM information signals on control tracks before and after the portion.
A head signal is recorded in the first control track of each of the programs A and B. The recorded contents of the CM position information indicate the start position and the end position of the CM, respectively.

During reproduction, the CM position information of the magnetic tape 1 is read by the CM information read / write circuit 19 while the magnetic tape 1 is normally reproduced, and the program is read from the magnetic tape 1 by the tape position information read / write circuit 14 during reproduction. When it becomes a CM part by comparison with the tape position information, the CM
The part is skipped by fast forward or the like.

In this case, since the start signal and the end signal of the CM cannot be input during the recording of the program, the microcomputer 13 instructs the tape drive circuit 15 by the microcomputer 13 based on the CM position information determined during the recording after the recording of the program. Then, the motor 8 is driven to drive the start signal and the end signal to the rewind start position and the end position to the CM position. At the time of reproduction, the CM part is fast-forwarded by reading the CM start signal, and the reproduction is returned to the standard reproduction when the CM end signal is read. There is no need to rewind to read the CM information to the beginning.

According to the present embodiment, normal reproduction can be performed automatically without the need to rewind the magnetic tape, so that operability is good.

In any of the above three methods, when CM information is written on a magnetic tape, the tape must be rewound after recording is completed and re-edited.

According to this embodiment, during recording of a program, the interval between singular points of an audio signal or a video signal is measured, whereby
A distinction can be made between a commercial message portion and a program content portion, and furthermore, during the reproduction of a program, the CM portion can be skipped by the information of the CM portion calculated and calculated at the time of recording.

Further, as described above, the method using the CM information storage circuit can be used only when the magnetic tape recorded by this method is reproduced by the device that records the tape. For example, even if the magnetic tape storing the CM information is reproduced by another device,
By reading the information of the head position, it is possible to skip the CM portion by appropriately reproducing it at a quick glance.

Further, by detecting a non-voice portion of the voice signal,
Since the commercial message portion is determined, the CM portion can be determined relatively easily.

Further, since the commercial message portion is also determined from the video signal, the CM portion can be more accurately determined.

Further, when the commercial message portion is determined from the video signal, the commercial message portion can be determined with higher accuracy by using the changed portion of the video signal.

Further, when the commercial message portion is determined from the video signal, the process can be simplified by using the fade-out portion of the video signal as compared with the case where the changing portion of the video signal is used.

Further, the accuracy can be further improved by performing the discrimination based on the broadcast mode. Next, another embodiment of the present invention will be described with reference to FIG.
FIG. 8 is a block diagram illustrating still another embodiment of the present invention. The same reference numerals as those in the embodiment of FIG. 2 indicate the same parts.

The difference from the second embodiment is that the means for storing CM information is written not on an external storage means such as a semiconductor but on a magnetic tape or the like on which a program is recorded.

As in the second embodiment, when recording a program, the microcomputer 13 discriminates a CM based on an audio signal. After the recording is completed, the microcomputer 13 instructs the tape drive circuit 15 to rewind the magnetic tape 1 in order to record the determined CM position information on the magnetic tape 1, and the tape drive circuit 15 controls the motor 8 to operate. When driven, the magnetic tape 1 is rewound, and the CM information read / write circuit 19 records CM information.

At the time of reproduction, the CM position information of the magnetic tape 1 is read by the CM information read / write circuit 19, and the information is stored in the microcomputer 13, and the tape position information is read from the magnetic tape 1 during reproduction of the program. When a CM portion is obtained by comparison with the tape position information read by the read / write circuit 14, the CM portion is skipped by fast-forwarding or the like. As described above, the position where the CM information is written is the head position of the magnetic tape, the beginning of the program, or the start signal or the end signal of the CM is written in the control track without writing the position information. is there.

According to the present embodiment, the distinction between the commercial message portion and the program content portion can be distinguished by measuring the interval of the singular point of the audio signal while recording the program, and the program can be reproduced. In addition, the CM part can be skipped based on the information of the CM part calculated and obtained at the time of recording.

Further, since the determined CM position information is recorded not on the outside but on the magnetic tape itself, the magnetic recording / reproducing apparatus having this function can also skip the CM.

Further, by detecting a non-voice portion of the voice signal,
Since the commercial message portion is determined, the CM portion can be determined relatively easily.

[0133] Further, by performing the discrimination based on the broadcast mode, the accuracy can be further improved.

[0134]

According to the present invention, the commercial message portion can be distinguished even if the broadcast mode is the same.

[Brief description of the drawings]

FIG. 1 is a block diagram of a video recording and reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating a CM determination method according to an embodiment of the present invention.

FIG. 3 is a block diagram of a video recording and reproducing apparatus according to another embodiment of the present invention.

FIG. 4 is a block diagram of a video recording and reproducing apparatus according to another embodiment of the present invention.

FIG. 5 is a schematic diagram of a magnetic tape according to another embodiment of the present invention in a horizontal longitudinal direction.

FIG. 6 is another schematic diagram of a magnetic tape according to another embodiment of the present invention in the horizontal longitudinal direction.

FIG. 7 is another schematic diagram of a magnetic tape in a horizontal longitudinal direction in another embodiment of the present invention.

FIG. 8 is a block diagram of a video recording / reproducing apparatus according to still another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Magnetic tape 2 ... Capstan 3 ... Pinch roller 4 ... Magnetic head 5 ... Rotating cylinder 6 ... Magnetic head changeover switch 7 ... Control pulse head 8 ... Magnetic tape drive motor 9 ... Audio signal level detector 10 ... Audio processing circuit DESCRIPTION OF SYMBOLS 11 ... Non-voice part detector 12 ... CM information storage circuit 13 ... Microcomputer 14 ... Tape position information read / write circuit 15 ... Tape drive circuit 16 ... Video signal level detector 17 ... Video signal processing circuit 18 ... Video signal detector 19 ... CM information read / write circuit 20 Tuner 21 Antenna 22 Control pulse read / write circuit 23 CM skip on / off switch 24 Broadcast mode discriminator

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) H04N 7/16 H04N 5/782 Z 5/91 Z G11B 27/19 Z (72) Inventor Shuyuki Okamoto Kanagawa 292 Yoshida-cho, Totsuka-ku, Yokohama-shi Inside Hitachi, Ltd.Video Media Research Laboratories (72) Inventor Masayuki Kijima 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside Hitachi Media Media Lab.

Claims (13)

[Claims] 1. A video recording / reproducing apparatus having a recording / reproducing means for recording a television broadcast signal on a recording medium and reproducing the television broadcast signal from the recording medium, comprising: At the time of recording, a non-speech part detecting means for detecting a non-speech part from an audio signal in the television signal, and a time interval between a plurality of non-speech parts detected by the non-speech part detecting means. A commercial message part detecting means for detecting a commercial message part in the John broadcast signal; a storage means for storing information on a recording position of the commercial message part detected by the commercial message part detecting means on the recording medium; The television broadcast from the recording medium by a recording / reproducing unit When reproducing the signal, the commercial message part is skipped at the recording position of the commercial message part on the recording medium, based on the information on the recording position of the commercial message part on the recording medium stored in the storage means. A video recording / reproducing apparatus comprising control means for controlling reproduction from the recording medium so as to reproduce the video. 2. The video recording / reproducing apparatus according to claim 1, further comprising: detecting a change point of the video signal from the video signal in the television signal when the recording / reproducing means records the television broadcast signal. A video signal detection unit, wherein the commercial message part detection unit includes a time interval between a plurality of non-speech portions detected by the non-speech portion detection unit and the plurality of non-speech portions detected by the video signal detection unit, and a change point of a plurality of video signals. A video recording / reproducing apparatus for detecting a commercial message part in the television broadcast signal based on a time interval between the two. 3. The video recording / reproducing apparatus according to claim 2, wherein the second commercial message part detecting means detects a point where the video signal level becomes a black level as a change point of the video signal. Video recording and playback device. 4. The video recording / reproducing apparatus according to claim 2, wherein said second commercial message part detecting means detects a point at which the video signal level becomes a white level as a change point of said video signal. Video recording and playback device. 5. The video recording / reproducing apparatus according to claim 2, wherein said second commercial message part detecting means detects a point at which a video signal level largely changes as said video signal change point. Video recording and playback device. 6. The video recording / reproducing apparatus according to claim 1, wherein said storage means comprises a semiconductor memory. 7. The video recording / reproducing apparatus according to claim 1, wherein the storage means is the recording medium on which the television broadcast signal is recorded by the recording / reproducing means. 8. The video recording / reproducing apparatus according to claim 7, wherein the information on the recording position on the recording medium of the commercial message portion stored on the recording medium by the storage means is a head position of the recording medium. A video recording / reproducing device characterized by being stored. 9. The video recording / reproducing apparatus according to claim 7, wherein information on a recording position on the recording medium of the commercial message portion stored on the recording medium by the storage means is recorded on the recording medium. A video recording / reproducing apparatus, wherein the video recording / reproducing apparatus is stored at a head position of each of a plurality of television signals. 10. The video recording / reproducing apparatus according to claim 7, wherein information on a recording position on the recording medium of the commercial message portion stored on the recording medium by the storage means is recorded on the recording medium. A video recording / reproducing apparatus, which is stored at a start position and an end position of a commercial message part included in a plurality of television signals. 11. The video recording / reproducing apparatus according to claim 2, further comprising: a broadcast mode of a program content portion and a commercial message portion in the television signal when the recording / reproducing means records the television broadcast signal. A mode discriminating means for detecting a commercial message part in the television broadcast signal based on the difference between the commercial message part detecting means, the commercial message part detecting means, the silent part detecting means, the video signal detecting means, and the mode discriminating means. Detecting a commercial message portion in the television broadcast signal based on a time interval between a plurality of non-sound portions and a time interval between change points of a plurality of video signals and a broadcast mode detected by A video recording / reproducing apparatus characterized by the above-mentioned. 12. The video recording / reproducing apparatus according to claim 1, wherein said first and second commercial message part detecting means have a detected time interval substantially a multiple of N seconds. A video recording / reproducing apparatus characterized in that it sometimes determines that the part is a commercial message part. 13. The video recording / reproducing apparatus according to claim 12, wherein said first and second commercial message part detecting means detects a commercial message when two or more time intervals substantially equal to a multiple of N seconds are successively detected. A video recording / reproducing apparatus characterized by determining that the message is a message part.