JP3659085B2 - Recording / playback device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
This caseRecordThe present invention relates to a playback device, and in particular, records and plays back a television broadcast signal, and distinguishes between a commercial message part and a program content part in a broadcast program.RecordThe present invention relates to a playback device.
[0002]
[Prior art]
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. As such an apparatus, for example, a bilingual broadcast mode determination method described in Japanese Patent Laid-Open No. 3-15886, a stereo broadcast mode determination method described in Japanese Patent Laid-Open No. 3-262287, and the like are known.
[0003]
In the method described in Japanese Patent Laid-Open No. 3-158066, since the commercial message is broadcast in stereo, the bilingual broadcast mode included in the audio signal of the television broadcast is discriminated and the program content in the bilingual broadcast mode is determined. The broadcast message portion is distinguished from the commercial message portion in the stereo broadcast mode, and only the commercial message (CM) portion is automatically deleted to record the program content portion in the bilingual broadcast mode.
[0004]
In the method described in Japanese Patent Laid-Open No. 3-262287, the stereo broadcast mode included in the audio signal of the television broadcast is discriminated, and the program content portion in the stereo broadcast mode is separated from the commercial message portion in the monaural broadcast mode. Separately, only the commercial message portion is automatically deleted, and the program content portion in the stereo broadcast mode is recorded.
[0005]
[Problems to be solved by the invention]
However, in the conventional technology described above, in the bilingual broadcast mode discrimination method, when the program content portion is a monaural broadcast program or a stereo broadcast program, the CM portion cannot be automatically deleted. Further, in the case of the stereo broadcast mode discrimination method, since the CM is originally premised on monaural broadcast, when the CM itself is a stereo broadcast, it cannot be distinguished from a stereo broadcast program.
[0006]
Therefore, in the conventional system, the program content part and the commercial message part are distinguished because the two kinds of program content parts are to be distinguished by the difference in the broadcast modes of bilingual broadcasting, monaural broadcasting, and stereo broadcasting. Are in the same broadcast mode, there is a problem that the two cannot be distinguished.
[0007]
In particular, in recent years, bilingual broadcasting and stereo broadcasting have been incorporated into the program content part, not only movie programs, but also music programs, sports programs, drama programs and other general programs. As a result, the possibility that only the commercial message portion can be deleted has declined, making it impossible to use it practically.
[0008]
An object of the present invention is to provide a video recording / reproducing apparatus capable of distinguishing commercial message portions even when the broadcast modes are the same.
[0009]
[Means for Solving the Problems]
To achieve the above object, the present inventionThe recording / reproducing apparatus according to the invention has a recording / reproducing means for recording a video signal and an audio signal on a recording medium, and reproducing the video signal and the audio signal from the recording medium, and a time interval between the change portion where the video signal and the audio signal change. A first discriminating means for discriminating that a predetermined time period and a plurality of continuous portions of the predetermined time period are commercial ranges; and discriminating that a range in which the audio signal is in a predetermined broadcast mode is a commercial range. And a second discriminating means.
[0010]
In addition, the recording / reproducing apparatus according to the present invention includes a recording / reproducing means for recording a video signal and an audio signal on a recording medium, and reproducing the video signal and the audio signal from the recording medium, and a changing unit for changing the video signal and the audio signal. A first control means for controlling the recording / reproducing means so as to skip a range in which a plurality of the predetermined time portions are continuous, and the audio signal is in a predetermined broadcast mode. And a second control means for controlling the recording / reproducing means so as to skip the range.
[0011]
The broadcast mode includes a stereo mode, a bilingual mode, or a monaural mode.
[0012]
The predetermined time is substantially a multiple of 15 seconds.
[0013]
Further, the changing unit is a portion where the level of the audio signal is substantially zero.
[0014]
Further, the changing unit is a portion where the level of the video signal is a black level or a white level.
[0015]
Further, the changing unit is a part in which levels of the video signal and the audio signal change.
[0016]
The skip is fast-forwarding or fast-playing.
[0017]
Further, the first control means controls to normally reproduce a portion where the portion of the predetermined time appears alone.
[0022]
[Action]
In the present invention,With the above configuration, the commercial message portion can be determined even if the broadcast mode is the same.
[0035]
【Example】
An embodiment of the present invention will be described with reference to FIG.
FIG. 1 is a block diagram of a video recording / reproducing apparatus according to an embodiment of the present invention.
[0036]
Two magnetic heads 4 are attached to 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. The two magnetic heads 4 are used by being switched by a magnetic head changeover switch 6, whereby a continuous reproduction signal can be obtained. Here, the magnetic head changeover switch 9 selects and switches the reproduction signal on the side in contact with the magnetic tape 1 according to which one of the two rotary heads is in contact. This timing is generally obtained by detecting a magnetic field generated by a magnet (not shown) attached to the rotating cylinder 5 with a sensor (not shown).
[0037]
The magnetic tape 1 is normally fed at a constant speed, and this speed is controlled by a capstan 2 disposed opposite to 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 in accordance with a mode such as normal running or fast-forward running of the magnetic tape 1. The
[0038]
Further, on the magnetic tape 1, in addition to a normal television broadcast signal, a control pulse for use in various controls is also recorded. This recording is performed using a control pulse head 7. Is called. Control pulses are recorded every 1/30 seconds.
[0039]
Here, a case where a television broadcast signal in which a CM exists is recorded will be described.
[0040]
A television broadcast signal is input to the antenna 21 and supplied to the tuner 20. The tuner 20 selects a desired program. 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 changeover switch 9. And recorded on the magnetic tape 1. In addition, the video signal processing circuit 17 performs conversion processing and outputs it as a baseband video signal, and is alternately sent to the two magnetic heads 4 via the magnetic head changeover switch 9 to be recorded on the magnetic tape 1. Is done.
[0041]
Simultaneously with the start of recording, in response to a command from the microcomputer 13, the tape position information read / write circuit 14 records the tape identification number along with the time code as the tape position information on the magnetic tape 1 via the magnetic head 4. This information is coded and written in each V blanking portion of the video signal, for example. The tape identification number is a number that forcibly assigns 99 titles to each magnetic tape in accordance with an instruction from the microcomputer 13.
[0042]
On the other hand, the signal output as the audio signal in the audio signal processing circuit 10 is supplied to the audio signal level detector 9. The audio signal level detector 9 detects the level of the audio signal level. The audio signal level detector 9 is composed of a smoothing circuit, for example, and smoothes a low-frequency audio signal to extract a DC signal.
[0043]
The magnitude of the level detected by the audio signal level detector 9 is supplied to the silent part detector 11. The silent part detector 11 detects a point where the voice signal level is near zero and supplies a detection signal to the microcomputer 13. The silent part detector 11 is constituted by, for example, a comparison circuit, and the level of the voice signal is set by comparing the level of the input voice signal with this reference voltage by setting the reference voltage to 0V or slightly higher than this level. When is greater than the reference voltage, a level “1” is output. Here, by incorporating a knot circuit in this circuit, a level “1” may be output when the level of the audio signal is lower than the reference voltage.
[0044]
The output of the silent partial 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. The time interval is measured, and if the interval between the current detection signal and the next detection signal is a fixed time interval, it is determined to be CM. The tape position information is time code information corresponding to an absolute address (absolute time), X minute, Y second, and Z frame from the head position of the tape. A method for determining the CM will be described later with reference to FIG.
[0045]
The voiceless partial detector 11 has been described as a circuit having a configuration different from that of the microcomputer 13. However, since the recent microcomputer 13 has a built-in A / D converter having a plurality of channels, the voice signal level detection is performed. The signal of the device 9 may be directly taken into the microcomputer 13 to perform A / D change, and then compared with a reference voltage in the microcomputer 13 to detect a silent portion.
[0046]
On the other hand, in the video signal processing circuit 17, the signal output as the baseband video signal is supplied to the video signal level detector 16. This video signal level detector 16 is a change point such as a point where the video signal level fades out to become a black level or a white level, a point where the signal level on the screen is averaged, and the signal level changes greatly (scene switching point). Is detected. The video signal level detector 16 is composed of, for example, a frame integration circuit. The frame integration circuit is triggered based on the vertical synchronization signal (V-sync) in the video signal and integrates the video signal for one frame. As a result, the average level of the video signal of the video signal for one frame is obtained, and the level of the level of the video signal is detected. The magnitude of the level of the video signal detected by the video signal level detector 16 is supplied to the video signal detector 18.
[0047]
The video signal detector 18 compares the obtained average level with the reference voltage of the comparison circuit. Here, by setting the reference voltage to a voltage slightly higher than the black level, if the frame-integrated signal is higher than the reference voltage, the comparison circuit determines that the black level is output. Of course, the comparison circuit may output when the frame integrated signal using the knot circuit is lower than the reference voltage.
[0048]
Further, by setting the reference voltage to a voltage slightly lower than the white level, if the frame-integrated signal is higher than the reference voltage, the comparison circuit determines that it is at the white level and outputs it.
[0049]
In order to detect a point where the signal level changes greatly (scene switching point), the video signal detector 18 is composed of a differentiation circuit and a comparison circuit, and the signal level is differentiated by the differentiation circuit. What is necessary is just to comprise so that a comparison circuit may detect whether a value is larger than a reference value.
[0050]
In the United States, it is common to fade out before and after the commercial message part, and in Japan, scene switching is common. However, in Japan, there may be a fade-out. Even in such a case, by using a method of detecting a point where the signal level changes greatly (scene switching point), before and after the fade-out, Since the signal level changes, it can be discriminated in the same way as scene switching.
[0051]
In the above description, the video signal for one frame is integrated. However, the video signal does not necessarily have to be for one frame. In short, it is only necessary to detect a scene change point, for example, near the center of the screen. Alternatively, only the signal may be integrated. For example, in order to integrate the video signals for the horizontal scanning lines from the 100th line to the 150th line, a trigger is applied to operate the integration circuit after a predetermined time from this signal based on the vertical synchronization signal (V-sync), Thereafter, the integration operation may be performed for a predetermined time.
[0052]
The comparison circuit has been described as a circuit having a configuration different from that of the microcomputer 13. However, since the recent microcomputer 13 has a built-in A / D converter having a plurality of channels, the signal of the integration circuit is directly input to the microcomputer. Capture in the computer 13 and perform A / D change, and then compare the reference voltage in the microcomputer 13 and compare the average level between frames to detect the change point of the video signal You may make it do.
[0053]
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 the time between the current detection signal and the next detection signal. If the interval is a fixed interval, it is determined to be CM. A method for determining the CM will be described later with reference to FIG. At the same time when the detection signal based on the audio signal and the video signal is output, the tape position information supplied from the tape position information read / write circuit 22 is also stored in the microcomputer 13.
[0054]
Depending on the characteristics of the audio signal and the video signal, if both the discrimination based on the non-voice portion signal and the discrimination based on the change portion or the fade-out portion of the video signal are used to determine the CM, the start of the CM and the end of the CM are determined. The tape position information and the tape identification number are supplied to the CM information storage circuit 12. The CM information storage circuit 12 stores a tape recognition 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 EEPROM or RAM, or a magnetic tape. That is, at the time of recording, CM position information is sequentially stored in the CM information storage circuit 12 while recording a program.
[0055]
As described above, while the CM is determined, the audio signal and the video signal are recorded on the magnetic tape 1 via the magnetic head 4 in the same manner as a normal video signal recording apparatus. . At this time, as described in the prior art, all program content parts and commercial message parts are recorded without deleting and recording the CM part. Then, during playback, the commercial message portion is skipped for playback.
[0056]
Next, the case where the 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 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 recognition number.
[0057]
Based on the CM position information referenced from the CM information storage circuit 12, the microcomputer 13 distinguishes the CM portion and the program portion from the tape position information being reproduced, and drives the tape so that the CM portion is skipped when the CM portion is reached. The circuit 15 is instructed to fast-forward or fast-playing.
[0058]
In fast-forwarding, video signals and audio signals cannot be reproduced from the magnetic tape 1, and the original commercial message portion is skipped from the television receiver screen, or the program content portion is skipped. On the other hand, in fast-playing, it is a video with a fast playback speed, but since it appears as a screen, whether the commercial message part is skipped or whether the program content part is skipped Since the user can identify, it is preferable to perform the quick playback for such needs.
[0059]
In response to the instruction, the tape drive circuit 15 drives the motor 8 to cause the magnetic tape 1 to travel at a high speed. The microcomputer 13 calculates the number of control pulses existing from the CM start position to the 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 measured number of control pulses reaches the number existing in the CM portion, the microcomputer 13 issues an instruction to the tape drive circuit 15 to stop fast-forwarding or quick-playback and return to standard playback. The tape drive circuit 15 drives the motor 8 to cause the magnetic tape 1 to perform standard reproduction running. Since the position information cannot be read from the magnetic tape 1 during high speed running, the moving distance of the tape (CM portion time) is measured using a control pulse.
[0060]
The subsequent CM portion is skipped in the same manner. As described above, the CM portion and the program portion are distinguished, and only the CM is skipped. The CM skip on / off switch 23 determines whether or not to skip the CM based on the judgment of the user. When this switch is on, an on signal is supplied to the microcomputer 13, and the microcomputer 13 is described above. The tape drive circuit is instructed to perform CM skip. When this switch is off, an off signal is supplied to the microcomputer 13, and the microcomputer 13 does not perform the above-described CM skip, and the commercial message portion is reproduced in the same manner as the program content portion.
[0061]
The broadcast mode discriminator 24 is CM discriminating means based on the broadcast mode discrimination described in the prior art. Based on the fact that the commercial message part is a stereo broadcast, the broadcast mode discriminator 24 detects other bilingual broadcast programs and monaural broadcast programs. It is to be determined. The broadcast mode discriminator 24 only discriminates the commercial message portion, and does not delete the record based on the signal from the broadcast mode discriminator 24. When the signal of the broadcast mode discriminator 24 is used in combination with the silent part detector 11 and the video signal detector 18, CM discrimination with higher accuracy can be performed.
[0062]
Next, a CM discrimination method will be described with reference to FIG.
[0063]
In FIG. 2, a thick solid line displayed as a recording signal represents a time axis. At the timing of the downward arrow described above the recording signal, a portion where the sound level becomes zero (no sound portion) is detected by the no sound portion detector 11 and taken into the microcomputer 13. Here, time t₁, T₂, T_Three, T_Four, T_Five, T₆, T₇, T₈, T₉, T_Ten, T₁₁A silent part is detected. The microcomputer 13 measures each time interval.
[0064]
CMs are created at regular intervals (15 seconds or multiples of 15 seconds, for example, 15 seconds, 30 seconds, 60 seconds), and the absence of voiceless parts before and after the CM. A portion where the interval of the audio portion is constant is determined as the CM portion. Of course, the program portion also includes a silent portion, but the interval is not a constant value unless intended. It is determined that the program is at least when the interval of the silent part is equal to or greater than a certain interval or less than a certain interval. The silent portion is measured inside the microcomputer 13 while recording the program on the magnetic tape 1, and is sequentially stored and marked in the CM information storage circuit 12 from the microcomputer 13, and the interval portion is recorded after the recording is completed. Is re-edited to distinguish the program portion and the CM portion and store them in the CM information storage circuit 12.
[0065]
Note that the time interval between silent parts is not exactly 15 seconds. This is because the time of the non-voice part itself is usually about 500 ms or more. This time varies depending on the CM, but is at least 200 ms. Therefore, when the time interval between the non-voice portions is 14.5 seconds to 15.0 seconds, 29.5 seconds to 30.0 seconds, and 59.5 seconds to 60.0 seconds, the CM portion Is determined. If this time interval is widened, even if the time interval of the CM portion is short, it can be determined that it is a CM portion, but in that case, the original program content portion may be erroneously determined as the CM portion.
[0066]
Here, the measurement of the time interval by the microcomputer 13 is, for example, (t₂-T₁) = 50 sec, (t_Three-T₁) = 65 sec, (t_Three-T₂) = 15 sec, (t_Four-T₂) = 30 sec, (t_Four-T_Three) = 15 sec, (t_Five-T₂) = 45 sec, (t_Five-T_Three) = 30 sec, (t_Five-T_Four) = 15 sec, (t₆-T₂) = 115 sec, (t₆-T_Three) = 100 sec, (t₆-T_Four) = 85 sec, (t₆-T_Five) = 70 sec, (t₇-T₆) = 15 sec, (t₈-T₆) = 30 sec, (t₈-T₇) = 15 sec, (t₉-T₆) = 38 sec, (t₉-T₇) = 23 sec, (t₉-T₈) = 8 sec, (t_Ten-T₆) = 53 sec, (t_Ten-T₇) = 38 sec, (t_Ten-T₈) = 23 sec, (t_Ten-T₉) = 15 sec, (t₁₁-T₆) = 64 sec, (t₁₁-T₇) = 49 sec, (t₁₁-T₈) = 34 sec, (t₁₁-T₉) = 26 sec, (t₁₁-T_Ten) = 11 sec.
[0067]
That is, not only the adjacent silent part but also the time interval between the adjacent part and the silent part is measured. This is because the silent message part may be included in the commercial message part of 15 seconds or a multiple of this time, so the commercial message part cannot be identified only by the time interval between the adjacent silent parts. It is. Therefore, time t₁For the silent part of₂, T_ThreeMeasure the time difference from. On the other hand, if the time interval between the voiceless part and the voiceless part exceeds 60 seconds, there is no commercial message part with a length of 60 seconds or longer. Is not measured. That is, time t₁For the silent part of_ThreeIf the time difference is measured, the subsequent time difference is not measured.
[0068]
In FIG. 2, the downward arrow above the silent portion indicates the video signal changing portion. That is, the screen signal level 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 time interval measurement in the above-described silent portion. As is clear from FIG. 2, the time interval of the video signal changing portion is shorter than the time interval of the silent portion. The video signal changing portion is measured inside the microcomputer 13 while the program is recorded on the magnetic tape 1, and the interval portion is re-edited sequentially 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 silent portion and the video signal changing portion.
[0069]
As the change point of the video signal, the point where the composite signal, the luminance signal, the color difference signal, etc. fade out to become the black level or the white level can also be used. The arrow indicates the fade-out part.
[0070]
Broadcast signals in Japan generally have a silent part before and after the commercial message part, but in the United States broadcast signals generally have a fade-out part before and after the commercial message part. In a recording apparatus used in the United States, a method using a fade-out portion is effective.
[0071]
Furthermore, time t₉To time t_TenThe silent portion appearing in FIG. 5 has a time interval of 15 seconds, which cannot be determined using the silent portion detector 11 or the video signal detector 18 described above. However, the commercial message part of 15 seconds does not often exist in a single shot, and two or four commercial message parts appear in succession. Therefore, when a 15-second silent portion is detected, it is determined whether it is a commercial message portion or a program content portion, depending on whether there is a 15-second silent portion that precedes and follows that portion. Time t₉To time t_TenWhen the silent part appearing in FIG. 6 is viewed, the silent part before that is 8 seconds, and the subsequent silent part is 11 seconds, so it is determined that it is a program content part.
[0072]
The time t can also be obtained by taking the logical sum of the fade-out partial signal and the silent part signal.₉To time t_TenIt can be determined that the non-speech part appearing in is a program content part.
[0073]
In addition to such a method, the CM portion can be discriminated by using the mode discriminator 24 together.
[0074]
In the method of detecting the video signal change portion, not only switching of the screen but also fading out can be determined, so that more accurate determination can be performed.
[0075]
On the other hand, as apparent from FIG. 2, in the method of detecting the video signal change portion, the amount of data is large, so the burden on the microcomputer 13 is increased. A method of detecting a fade-out portion is preferable. In particular, this fade-out method is effective in the United States.
[0076]
According to this embodiment, while recording a program, by measuring the interval between the singular points of the audio signal and the video signal, it is possible to distinguish between the commercial message part and the program content part, and also during the program playback. In addition, the CM portion can be skipped based on the CM portion information obtained by calculation at the time of recording.
[0077]
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.
[0078]
Further, since the non-voice part of the voice signal is detected and the commercial message part is discriminated, the CM part can be discriminated relatively easily.
[0079]
Further, since the commercial message portion is also determined from the video signal, the CM portion can be determined more accurately.
[0080]
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.
[0081]
Further, when determining the commercial message portion from the video signal, the processing 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.
[0082]
Further, the accuracy can be further improved by performing the discrimination based on the broadcast mode.
[0083]
Next, another embodiment of the present invention will be described with reference to FIG.
FIG. 3 is a block diagram of a video recording / reproducing apparatus according to another embodiment of the present invention. The same reference numerals as those in the embodiment of FIG. 1 denote the same parts.
[0084]
The difference from the first embodiment is that no CM judging means based on a video signal is used.
[0085]
First, a case where a magnetic tape is inserted and a television broadcast with a CM is recorded will be described.
Radio waves for television broadcasting are input to the antenna 21 and supplied to the tuner 20. The tuner 20 selects a desired program. The program selected by the tuner 20 is output as an audio signal by the audio signal processing circuit 10. Further, the video signal processing circuit 17 outputs the video signal. 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 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 tape identification number on the magnetic tape 1 together with the time code that is the position information of the tape. This information can be coded and written in the blanking portion of the video signal, for example.
[0086]
On the other hand, in the audio signal processing circuit 10, a signal output as an audio signal is supplied to the audio signal level detector 9. The audio signal level detector 9 detects the level of the audio signal and supplies the level to the silent part detector 11. The silent part detector 11 detects a point where the voice signal level is near zero and supplies a detection signal to the microcomputer 13.
[0087]
The microcomputer 13 stores the time of the current detection signal supplied from the silent part detector 11 and the tape position information supplied from the tape position information read / write circuit 14, and detects the detection signal from the time of the next detection signal. The time interval is measured, and if the interval is a constant interval, it is determined to be CM. At the same time as the detection signal based on the audio signal is output, the tape position information supplied from the tape position information read / write circuit 22 is also stored in the microcomputer 13.
[0088]
When it is determined that the audio signal is a CM, the tape position information and the tape recognition number at the start and end of the CM are supplied to the CM information storage circuit 12. The CM information storage circuit 12 stores a tape recognition 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 EEPROM or RAM, or a magnetic tape. That is, at the time of recording, CM position information is sequentially stored in the CM information storage circuit 12 while recording a program.
[0089]
Next, when reproducing the recorded program, the tape position information read / write circuit 14 reads out the tape position information and the tape identification number written on the magnetic tape 1. 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 by the tape recognition number.
[0090]
The microcomputer 13 distinguishes the CM portion and the program portion from the tape position information being reproduced based on the CM position information referenced from the CM information storage circuit 12, and when the CM portion is reached, the CM portion is skipped. The drive circuit 15 is instructed to fast-forward or fast-play. In response to the instruction, the tape drive circuit 15 drives the motor 8 to cause the magnetic tape 1 to travel at a high speed.
[0091]
The microcomputer 13 calculates the number of control pulses existing from the CM start position to the 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 fast-forwarding or fast-playing and return to standard playback. To drive the magnetic tape as standard playback. The subsequent CM portion is skipped in the same manner. As described above, the CM portion and the program portion are distinguished and only the CM is skipped.
[0092]
According to the present embodiment, it is possible to distinguish between the commercial message portion and the program content portion by measuring the interval between the singular points of the audio signal during recording of the program, and further, while recording the program, The CM portion can be skipped by the information of the CM portion obtained by calculation at times.
[0093]
Compared to the first embodiment, the number of elements for determining the CM is reduced, but the circuit scale can be reduced, and the memory for storing the information of singular points when determining the CM can be reduced.
[0094]
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.
[0095]
Further, since the non-voice part of the voice signal is detected and the commercial message part is discriminated, the CM part can be discriminated relatively easily.
[0096]
Further, the accuracy can be further improved by performing the discrimination based on the broadcast mode.
[0097]
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 denote the same parts.
[0098]
The difference from the first embodiment is that the means for storing the 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.
[0099]
As described in the first embodiment, CM is determined by the microcomputer 13 based on the audio signal and the video signal when the program is recorded. After recording, the microcomputer 13 instructs the tape drive circuit 15 to rewind the tape in order to record the determined CM position information 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. When reproducing, 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. When the CM portion is obtained by comparison with the tape position information read out by, the CM portion is skipped by fast-forwarding or the like.
[0100]
The position where the CM information is recorded will be described with reference to FIG.
[0101]
FIG. 5 is a schematic diagram in the horizontal longitudinal direction of the magnetic tape 1 in another embodiment of the present invention, showing a control track portion and a portion for recording a video signal.
[0102]
In the example of FIG. 5, a portion for storing CM information is provided at the beginning of winding of the magnetic tape 1, and CM information for all programs is stored therein. In the case of this example, the information of program A and program B is recorded at the head portion (shaded portion). A CM position information start signal is recorded on the control track at the head portion of the magnetic tape 1, and CM position information is recorded in the main body recording portion of the magnetic tape 1 following this CM position information start signal. A heading signal is recorded on the top control track of the programs A and B.
[0103]
The recorded content of the CM position information is information regarding the CM portion positioned between the programs A and B as shown in FIG. That is, for the program A, the time length information of the program A-1, the following CM time length information, the program A-2 time length information, the subsequent CM time length information, the program It is information on the time length of A-3. Further, information on the duration of the program B-1 for the subsequent program B, information on the duration of the subsequent CM, information on the duration of the program B-2, and information on the duration of the subsequent CM are collectively displayed. It is recorded as.
[0104]
At the time of reproduction, the magnetic tape 1 is rewound to the head position, a CM position information start signal is detected, and then the CM position information of the magnetic tape 1 is read by the CM information read / write circuit 19 by normal reproduction. Information is stored in the microcomputer 13, and when the CM portion is compared 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.
[0105]
According to the present embodiment, once the head CM information is read once, CM information of all programs can be grasped.
[0106]
Further, since the CM information is recorded at the head portion of the tape, all the CM information can be rewritten again when overwritten.
[0107]
FIG. 6 is a schematic view of another example of the transverse direction of the magnetic tape 1 in another embodiment of the present invention, showing a control track portion and a portion for recording a video signal.
[0108]
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 program A and program B is recorded in the head part (shaded part) of program A and program B, respectively. A CM position information start signal is recorded at the beginning of each program on the control track of the magnetic tape 1, and CM position information is recorded in the main body recording portion of the magnetic tape 1 following this CM position information start signal. Yes. A heading signal is recorded on the first control track of each of programs A and B.
[0109]
The recorded content of the CM position information is information regarding the CM portion positioned between the programs A and B as shown in FIG. That is, for the program A, the time length information of the program A-1, the following CM time length information, the program A-2 time length information, the subsequent CM time length information, the program It is information on the time length of A-3. For program B, information on the time length of program B-1, subsequent time length information on CM, time length information on program B-2, and subsequent time length information on CM are recorded. Has been.
[0110]
When reproducing, the magnetic tape 1 is rewound to the head position of each program, the CM position information start signal is detected, and then the CM position information of the magnetic tape 1 is read by the CM information read / write circuit 19 by normal reproduction. The information is stored in the microcomputer 13, and when the CM portion is compared with the tape position information read from the magnetic tape 1 by the tape position information read / write circuit 14 during playback of the program, the CM portion is skipped by fast-forwarding or the like. Let
[0111]
According to the present embodiment, it is only necessary to rewind to the beginning of each program, so that the rewinding amount is smaller than in the above-described example, and the operability is good.
[0112]
In this case, the amount of rewinding the tape after completion of recording can be minimized. However, when overwriting or the like, CM information may be lost.
[0113]
On the other hand, in the example shown in FIG. 5, since it is the head portion of the tape, all the CM information can be rewritten even when overwritten.
[0114]
FIG. 7 is a schematic diagram of another example of the magnetic tape 1 in the transverse longitudinal direction according to another embodiment of the present invention, showing a control track portion and a portion for recording a video signal.
[0115]
In the example of FIG. 7, a CM destination start signal and a CM end signal are recorded as CM information signals on control tracks before and after the CM portion for each recorded program. A heading signal is recorded on the first control track of each of programs A and B. The recorded contents of the CM position information each indicate the start position and the end position of the CM.
[0116]
During playback, the CM position information on the magnetic tape 1 is read by the CM information read / write circuit 19 while the magnetic tape 1 is normally played, and the tape position information is read from the magnetic tape 1 by the tape position information read / write circuit 14 during playback of the program. If the CM portion is compared with the above, the CM portion is skipped by fast-forwarding or the like.
[0117]
In this case, since the CM start signal and end signal cannot be input during program recording, the microcomputer 13 instructs the tape drive circuit 15 by the microcomputer 13 based on the CM position information determined during recording after the program recording ends. To start the rewind start position and end position to the CM position. At the time of reproduction, the CM start signal is read to fast-forward the CM portion, and the standard reproduction is restored when the CM end signal is read. There is no need to rewind to read the CM information to the head.
[0118]
According to this embodiment, it is easy to operate because it is possible to skip automatically without having to rewind the magnetic tape by normal reproduction.
[0119]
In any of the three methods described above, when CM information is written on a magnetic tape, the tape must be rewound again after recording and re-edited.
[0120]
According to this embodiment, while recording a program, by measuring the interval between the singular points of the audio signal and the video signal, it is possible to distinguish between the commercial message part and the program content part, and also during the program playback. In addition, the CM portion can be skipped based on the CM portion information obtained by calculation at the time of recording.
[0121]
In addition, 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 recorded the tape. Even when the information-stored magnetic tape is played back by another device, the CM portion can be skipped by appropriate and quick playback by reading the information at the head position.
[0122]
Further, since the non-voice part of the voice signal is detected and the commercial message part is discriminated, the CM part can be discriminated relatively easily.
[0123]
Further, since the commercial message portion is also determined from the video signal, the CM portion can be determined more accurately.
[0124]
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.
[0125]
Further, when determining the commercial message portion from the video signal, the processing 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.
[0126]
Further, the accuracy can be further improved by performing the discrimination based on the broadcast mode. Next, still 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.
[0127]
The difference from the second embodiment is that the means for storing the CM information is written not on the external storage means such as a semiconductor but on the magnetic tape or the like on which the program is recorded.
[0128]
As in the second embodiment described above, the CM is discriminated by the microcomputer 13 based on the audio signal when the program is recorded. After recording, in order to record the determined CM position information on the magnetic tape 1, the microcomputer 13 instructs the tape drive circuit 15 to rewind the magnetic tape 1, and the tape drive circuit 15 turns the motor 8 on. The magnetic tape 1 is driven to rewind, and the CM information read / write circuit 19 records the CM information.
[0129]
At the time of reproduction, the CM position information on the magnetic tape 1 is read out by the CM information read / write circuit 19, 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. When the CM portion is obtained by comparison with the tape position information read out by, the CM portion is skipped by fast forward or the like. As described above, the CM information is written at the beginning of the magnetic tape, at the beginning of the program, or the position information is not written and a CM start signal or end signal is input to the control track. is there.
[0130]
According to the present embodiment, it is possible to distinguish between the commercial message portion and the program content portion by measuring the interval between the singular points of the audio signal during recording of the program, and further, while recording the program, The CM portion can be skipped by the information of the CM portion obtained by calculation at times.
[0131]
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 similarly skip the CM.
[0132]
Further, since the non-voice part of the voice signal is detected and the commercial message part is discriminated, the CM part can be discriminated relatively easily.
[0133]
Further, the accuracy can be further improved by performing the discrimination based on the broadcast mode.
[0134]
【The invention's effect】
According to the present invention, the commercial message portion can be distinguished even when the broadcast mode is the same.
[Brief description of the drawings]
FIG. 1 is a block diagram of a video recording / reproducing apparatus according to an embodiment of the present invention.
FIG. 2 is a diagram illustrating a CM discrimination method according to an embodiment of the present invention.
FIG. 3 is a block diagram of a video recording / reproducing apparatus according to another embodiment of the present invention.
FIG. 4 is a block diagram of a video recording / reproducing apparatus according to another embodiment of the present invention.
FIG. 5 is a schematic diagram in the transverse longitudinal direction of a magnetic tape in another embodiment of the present invention.
FIG. 6 is another schematic diagram of the transverse longitudinal direction of the magnetic tape in another embodiment of the present invention.
FIG. 7 is another schematic view in the transverse longitudinal direction of a magnetic tape 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]
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
11 ... Soundless partial 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

Claims (9)

Recording and reproducing means for recording a video signal and an audio signal on a recording medium, and reproducing the video signal and the audio signal from the recording medium;
First determination means for determining that a time interval of the changing portion in which the video signal and the audio signal change is a predetermined time and that a range in which a portion of the predetermined time is continuous is a commercial range;
Second discriminating means for discriminating that a range in which the audio signal is in a predetermined broadcast mode is a commercial range;
A recording / reproducing apparatus comprising: Recording and reproducing means for recording a video signal and an audio signal on a recording medium, and reproducing the video signal and the audio signal from the recording medium;
A first control means for controlling the recording / reproducing means so that a time interval of the changing portion where the video signal and the audio signal change is a predetermined time, and a range in which a portion of the predetermined time is continuous is skipped. ,
Second control means for controlling the recording / reproducing means so as to skip a range in which the audio signal is in a predetermined broadcast mode;
A recording / reproducing apparatus comprising: The recording / reproducing apparatus according to claim 1, wherein the broadcast mode includes a stereo mode, a bilingual mode, or a monaural mode. 4. The recording / reproducing apparatus according to claim 1, wherein the predetermined time is substantially a multiple of 15 seconds. 4. The recording / reproducing apparatus according to claim 1, wherein the changing unit is a portion where the level of the audio signal is substantially zero. 4. The recording / reproducing apparatus according to claim 1, wherein the changing unit is a portion where the level of the video signal is a black level or a white level. 4. The recording / reproducing apparatus according to claim 1, wherein the changing unit is a part where levels of the video signal and the audio signal change. The recording / reproducing apparatus according to claim 2, wherein the skip is fast-forward or fast-play. 3. The recording / reproducing apparatus according to claim 2, wherein the first control means performs control so as to normally reproduce a portion where the portion corresponding to the predetermined time appears alone.

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