JPH08180506A - Recording/reproducing apparatus - Google Patents

Abstract

PURPOSE: To obtain a system which selectively records important scenes at the recording time or automatically controls the reproducing speed for the important scenes at the reproducing time. CONSTITUTION: A recording device 11.receiving inputs of an image signal from an input terminal 12 and stereo audio signals from input terminals 13a, 13b processes the signals and records them on a magnetic tape 15. A signal (a) of the stereo audio signals added in reverse phases at an adder 16 is compared with a reference voltage Vref at a comparator 17. If the signal (a) exceeds the reference voltage Vref, an output, signal (b) shows a high level. A recording start, control circuit 18, when receiving the output signal (b), outputs a recording start control signal (d) fitting to the specifications of the recording device 11 when the output signal (b) is in the high level, t,hereby turning the recording device 11 into a recording state. A delay circuit 19 outputs a signal (c) delaying a high level term by a fixed time td when the circuit receives the output signal (b) and the signal (b) is in the high level. Upon receipt of the signal (c), a temporary stop control circuit 20 outputs a temporary stop control signal (e) fit for the specifications of the recording device 11, thereby temporarily stopping the recording device 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for recording information on a recording medium or reproducing information from the recorded medium,
The present invention relates to a recording and reproducing device that selectively records or reproduces important information.

[0002]

2. Description of the Related Art For example, when playing back a recording tape on which a sports program such as sumo or soccer is recorded on a VTR for home use and wanting to know the result, an important scene such as a sumo wrestling scene or a soccer shoot scene. Often only select and watch. In this case, the user repeatedly uses standard speed playback mode and high speed playback mode,
Important scenes had to be played in standard speed playback mode, and other scenes had to be played back in high speed playback mode.

As described above, in order to selectively reproduce only important scenes, a complicated operation of controlling the reproduction speed with a remote controller or the like while constantly monitoring recorded information is required.

[0004]

As described above,
In the conventional recording / reproducing apparatus, a complicated operation is required to selectively reproduce only important scenes.

An object of the present invention is to determine an important scene when recording information and selectively record it, or to judge an important scene when reproducing information and automatically control the reproduction speed.

[0006]

In order to solve the above-mentioned problems, the present invention provides a plurality of signals including at least a stereo audio signal to be recorded on a medium, a means for adding an inverse phase of the stereo audio signal, and the inverse signal adding means. Means for comparing the level of the phase-added signal with a set value, and based on the comparison result,
It is characterized by comprising means for controlling the start of recording of the plurality of signals, and means for stopping the recording after a set time has elapsed since the recording was started by the means.

Further, a plurality of signals including at least a stereo audio signal to be recorded on the medium, a means for adding the opposite phase of the stereo audio signal, a means for comparing the level of the anti-phase added signal with a set value, It is characterized by further comprising means for generating a start code according to the comparison result, means for generating an end code after a set time, and means for recording the start code and the end code together with the plurality of signals on a medium.

Further, a plurality of signals including at least a stereo audio signal to be recorded on the medium, means for adding the opposite phase of the stereo audio signal, means for comparing the level of the opposite phase added signal with a set value, It is characterized in that it has means for generating a start code based on the comparison result, and means for recording the start code on the medium together with the plurality of signals.

Further, means for reproducing a plurality of signals including at least a stereo sound signal, means for adding the opposite phases of the stereo sound signals, and means for comparing the level of the opposite-phase added signals with a set value. It is characterized in that it has means for controlling to a first reproduction speed based on the comparison result, and means for controlling to a second reproduction speed after reproducing at the first reproduction speed for a set time.

Further, a plurality of signals including at least a stereo audio signal to be recorded on the medium and a means for adding the opposite phases of the stereo audio signals, a means for comparing the level of the opposite phase added signals with a set value, A means for generating a start code according to the comparison result, a means for generating an end code after a set time, a means for recording the start code and the end code together with the plurality of signals on a medium, and a means for recording on the medium at the time of reproduction. It is characterized in that the reproducing speed is made different between the means for detecting the start code and the end code, and the period from the detection of the start code to the detection of the end code and the other period.

[0011]

With the above-mentioned means, for example, in recording a video signal and an audio signal of a sports program, the right signal and the left signal of the stereo audio signal are added in anti-phase to attenuate the sound of the announcer localized in the center, thereby reducing the spectator's sound. The cheering sound can be extracted. When the level of the cheering sound exceeds a certain set value, it is determined that the scene is important, and from that point, the video signal and the audio signal are recorded for a certain time, and then the recording is automatically stopped. Also, when the cheering sound newly exceeds the set value during recording, recording is continued for a certain time from the last point. Depending on the type of sport, there may be a cheering sound as a result of an important scene, but in such a case it is possible to record delayed video and audio signals.

As a result, the video signal and the audio signal of the important scene can be selectively recorded.

During recording of a video signal and an audio signal, an important scene is determined by the same method as described above, a start code is recorded at that time, and an end code is recorded after a certain period of time. If a new important scene is judged before the end code is recorded, the end code is recorded after a fixed time after the last judgment. When the medium recorded in this way is reproduced, the medium is reproduced at the normal speed during the period from the detection of the start code to the detection of the end code, and the high speed reproduction is performed during the other period. As a result, it becomes possible to selectively reproduce the video signal and the audio signal of the important scene.

Also, during recording of the video signal and the audio signal, an important scene is judged by the same method as described above, and the start code is recorded at that time. When the medium thus recorded is reproduced, the medium is reproduced at the normal speed for a certain period of time after the start code is detected, and at the high speed for the other periods. When a new start code is detected during reproduction at normal speed, normal speed reproduction is continued for a certain period of time after the last start code is detected. As a result, it becomes possible to selectively reproduce the video signal and the audio signal of the important scene.

Furthermore, during reproduction of the video and audio signals,
By adding the right and left signals of the stereo audio signal in anti-phase, the voice of the announcer localized in the center is attenuated and the cheering sound of the audience can be extracted. When the level of the cheering sound exceeds a certain set value, it is determined that the scene is important, and from that point of time, normal speed reproduction is performed for a certain period of time, and high speed reproduction is performed during other periods. Further, when the cheering sound newly exceeds the set value during the reproduction at the normal speed, the reproduction at the normal speed is continued for a certain time from the last time point. Thereby, the video signal and the audio signal of the important scene can be selectively reproduced.

[0016]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a circuit diagram for explaining an embodiment of the present invention when applied to a VTR. In FIG. 1, a video signal from the input terminal 12 and a stereo audio signal from the input terminals 13a and 13b are input to the recording device 11 which is a VTR. These signals are recorded by the recording device 11
And is recorded on the magnetic tape 15 via the magnetic head 14. Of the plurality of signals input from the input terminals 13a and 13b, the right signal and the left signal of the stereo audio signal are added by the adder 1
In step 6, reverse phase addition is performed, and the addition output is input to one input terminal of the comparator 17 and compared with the reference voltage Vref input to the other input terminal of the comparator 17. The comparison output is input to the recording device 11 via the recording start control circuit 18. The output of the comparator 17 is input to the recording device 11 via the delay circuit 19 and the temporary stop control circuit 20.

Next, the operation of FIG. 1 will be described using the operation waveforms of the respective parts of FIG. 1 shown in FIG. A shown in FIG.
2 to e correspond to the symbols in FIGS. 2A to 2E, respectively. Adder 1 for right and left stereo audio signals
At 6, the opposite phase is added. This anti-phase addition signal a and the reference voltage Vr
The comparator 17 compares the levels of ef. When the anti-phase addition signal a exceeds the reference voltage Vref, the output signal b of the comparator 17 outputs a high level. The recording start control circuit 18 receives the output signal b of the comparator 17, outputs the recording start control signal d corresponding to the specifications of the recording device 11 when it is at a high level, and puts the recording device 11 into the recording state.

On the other hand, the delay circuit 19 receives the output signal b of the comparator 17, and when it is at a high level, outputs a signal c obtained by extending the high level period by a fixed time td. The suspension control circuit 20 receives the signal c in which the high level period is extended, outputs the suspension control signal e corresponding to the specifications of the recording device 11, and puts the recording device 11 in the suspended state.

In this embodiment, the voices of an announcer or the like localized in the center can be attenuated and the cheers of the spectators can be extracted by adding the opposite phases of the stereo voices, and the cheering level becomes higher than the reference level. If you record for a certain period from the time, you can selectively record important parts.

A first alternative embodiment of the present invention having the same configuration as that shown in FIG. 1 except that the delay circuit 19 shown in FIG. 1 is of a re-trigger operation type will be described with reference to FIG.
FIG. 3 shows operation waveforms corresponding to the respective parts a to e in FIG. 1 when the delay circuit is made to have a re-trigger operation. Here, only the points different from the description of the operation waveforms in FIG. 2 will be described. When the output signal b of the comparator 17 receives the high level and delays it for a fixed time td while the output signal b newly becomes high level for the delay circuit 19, the delay circuit 19 delays the fixed time td from this point.

In this embodiment, by re-triggering the time setting from the start of recording to the pause, recording can be continued for a certain period of time even if a new cheer is received during recording. Also, by delaying all signals to be recorded, it is possible to record even when cheers occur as a result of important scenes.

Next, a second other embodiment of the present invention will be described with reference to FIG. 4, in which the same parts as those shown in FIG. 1 are designated by the same reference numerals. In this embodiment, all input signals are input to the recording device 11 via a signal delay circuit 41 that delays for a fixed time. The stereo signal is directly input to the adder 16 from the input terminals 13a and 13b without passing through the signal delay circuit 41.

In this embodiment, the video signal and the audio signal can be recorded from a time point past the judgment time point of the recording start control circuit 18.

The third aspect of the present invention when applied to a VTR
Another embodiment will be described with reference to FIG. 5, and the same components as those in FIG. 1 will be described with the same reference numerals. VT
A video signal is input from the input terminal 12 and a stereo audio signal is input from the input terminals 13a and 13b to the recording device 11 which is R. Each signal is processed by the recording device 11 and recorded on the magnetic tape 15 via the signal magnetic head 14. Of the input signals, the right signal and the left signal of the stereo audio signal are added in anti-phase by the adder 16, and the added output is input to one comparison input of the comparator 17 and the other comparison input of the comparator 17. It is compared with the reference voltage Vref input to. The comparison output is input to the code modulation circuit 52 via the start code generation circuit 51. The comparison output is the delay circuit 1
9 and the end code generation circuit 53, the code recording circuit 5
Enter 2. The output signal of the code modulation circuit 52 is recorded on the magnetic tape 15 via the control magnetic head 54 of the recording device 11.

Next, the operation of FIG. 5 will be described with reference to FIG. 6 which shows the operation waveforms of the respective portions a to f of FIG. The right signal and the left signal of the stereo audio signal are added in anti-phase by the adder 16. The anti-phase addition signal a and the reference voltage Vref are compared in level by the comparator 17, and the anti-phase addition signal a is compared with the reference voltage Vre.
When it exceeds f, the comparison output signal b outputs a high level.
The start code generation circuit 51 receives the comparison output signal b and outputs the start code signal d when it is at a high level. On the other hand, the delay circuit 19 receives the comparison output signal b, and when it is at a high level, a signal c obtained by extending the high level period by a certain time td.
Is output. The end code generation circuit 53 receives the signal c in which the high level period is extended and outputs the end code signal e. The code modulation circuit 52 receives the start code signal d and the end code signal e and outputs a start / end control signal f which is modulated so that it can be recorded on the magnetic tape 15 via the control magnetic head 54 of the recording device 11, and the magnetic These signals are recorded on the control track of the tape 15.

In a normal home VTR, the servo reference signal is recorded on the control track.
The end control signal f is most common in the method of pulse-width modulating the reference signal of this servo.

In this embodiment, the voices of the announcer or the like localized in the center can be attenuated by adding the opposite phase of the stereo voices to extract the cheers of the audience. When the level of the cheers exceeds the reference level. If a start code is recorded in and the end code is recorded after a certain period of time, it becomes a reproduction control signal for selectively reproducing an important part.

A fourth alternative embodiment of the present invention will be described with reference to FIG. 7 having the same configuration except that the configuration of the delay circuit 19 of FIG. FIG. 7 shows operation waveforms of the respective parts of FIG. 5 when a delay circuit having a re-trigger operation is used. The symbols a to f in FIGS. 5 and 7 correspond to each other. Here, only the points different from the operation waveforms in FIG. 6 will be described. When the comparison output signal b newly becomes high level while the delay circuit receives the comparison output signal b at high level and extends it for a certain time td, the comparison output signal b newly becomes high level. The time td is extended from the time point.

In this embodiment, the time from the start code to the end code is set as a re-trigger, so that even if there is a new cheer between the start code and the end code, the end code is set after a certain time from that point. Can be recorded.

FIG. 8 is a circuit configuration diagram for explaining a fifth other embodiment of the present invention. First, the configuration and operation of the embodiment shown in FIG. 8 will be described using the operation waveforms shown in FIG. The symbols from g to j in FIGS. 8 and 9 correspond to each other. The reproducing device (VTR) 81 has a signal magnetic head 82 and a control magnetic head 83. The video signal and the audio signal recorded on the magnetic tape 84 are reproduced by the magnetic head 82, and the control signal is also generated by the magnetic head 83. Play with. The reproduced video signal and audio signal are subjected to predetermined reproduction signal processing to become a final video signal and stereo audio signal, and the video signal is output to the output terminal 85 and the stereo audio signal is output to 86a and 86b, respectively. The control signal g is sent to the reproducing device 81 for normal servo control, and is also sent to the code demodulation circuit 87 to demodulate the start / end control signal h reproduced here.

As mentioned in the embodiment of FIG. 5, pulse width demodulation is normally used. The demodulated start / end control signal is
It is sent to the start code detection circuit 88 and the end code detection circuit 89. The start code detection circuit 88 outputs a control signal i for reproducing the reproducing device at the normal speed when the start code arrives,
The end code detection circuit 89 outputs a control signal j for reproducing the reproducing device at high speed when the end code arrives.

In this embodiment, by utilizing the start code and the end code, the important scene between the start code and the end code can be selectively reproduced at the normal speed, and the other period can be reproduced at the high speed.

A sixth embodiment of the present invention when applied to a VTR will be described with reference to FIG. 10. The same parts as those of the embodiment of FIG. 5 are designated by the same reference numerals. The video signal is input to the input terminal 12 of the recording device 11 by the input terminal 13a,
A stereo audio signal is input to 13b. Each signal is subjected to signal processing by the recording device 11, and the magnetic head 14 for signals is used.
It records on the magnetic tape 15 via. Of the plurality of signals input to the recording device 11, the right signal and the left signal of the stereo audio signal are added in anti-phase by the adder 16, and the addition output is input to one of the comparators 17 and connected to the other input. The reference voltage Vref is compared. The comparison output is input to the code modulation circuit 52 via the start code generation circuit 51. The output signal of the code modulation circuit 52 is recorded on the magnetic tape 15 via the control magnetic head 54 of the recording device 11.

Next, the operation of the embodiment of FIG. 10 will be described using the operation waveforms of the respective parts shown in FIG. 10 and 11 correspond to a to f, respectively. The right signal and the left signal of the stereo audio signal are added in anti-phase by the adder 16. The comparator 17 compares the levels of the anti-phase addition signal a and the reference voltage Vref, and when the anti-phase addition signal a exceeds the reference voltage Vref, the comparison output signal b outputs a high level. The start code generation circuit 51 receives the comparison output signal b and outputs the start code signal d when it is at a high level. Code modulation circuit 52
Receives the start code signal d and outputs a start control signal f which is modulated so that it can be recorded on the magnetic tape 15 via the control magnetic head 54 of the recording device 11, and the magnetic tape 1
Record those signals on 5 control tracks.

In a normal home VTR, the servo reference signal is recorded on the control track, but the above-mentioned start control signal is the most general method of pulse-width modulating the servo reference signal.

In this way, the voices of the announcer or the like localized in the center can be attenuated by adding the opposite-phase stereo voices to extract the cheers of the audience, and when the level of the cheers exceeds the reference level. If the start code is recorded, it becomes a reproduction control signal for selectively reproducing an important part.

FIG. 1 shows the seventh embodiment of the present invention.
The circuit configuration diagram of No. 2 will be described. The same parts as those in the embodiment of FIG. 8 are designated by the same reference numerals in the following description. 12g and 13g
The symbols up to k correspond to each other. Playback device 81
Has a signal magnetic head 82 and a control magnetic head 83, and reproduces the video signal and the audio signal recorded on the magnetic tape 84 by the magnetic head 82, and also reproduces the control signal by the magnetic head 83. The reproduced video signal and audio signal are subjected to predetermined reproduction signal processing, and become a final video signal and audio signal and output from the output terminals 85, 86a, 86b. The control signal g is sent to the reproducing device 81 for normal servo control and is also sent to the code demodulation circuit 82 to demodulate the reproduced start control signal h. As described in the embodiment of FIG. 10, usually pulse width demodulation is used.

The demodulated start control signal h is sent to the start code detection circuit 88 to generate the normal reproduction control signal i. The normal reproduction control signal is delayed by the delay circuit 121 which is delayed by a fixed time td and then sent to the end code generation circuit 89 to generate the high speed reproduction control signal j. The normal reproduction control signal i and the high speed reproduction control signal j are sent to the reproduction device 81 to control the reproduction speed.

In this embodiment, an end code is created from a signal obtained by delaying the start code reproduced on the reproducing apparatus 81 side for a predetermined time by using the start code, and an important scene between the start code and the end code is selectively selected. It can be played back at normal speed, and can be played back at high speed in other periods.

An eighth embodiment of the present invention, which has the same circuit configuration as that of FIG. 12 except that the delay circuit is of a re-trigger operation, will be described with reference to FIG. FIG. 14 is an operation waveform of each part when the delay circuit is retriggered. The symbols g to k in FIGS. 12 and 14 correspond to each other. Only the points different from the description of the operation waveforms in FIG. 13 will be described.

When the output signal i of the start code detecting circuit 88 newly becomes high level while the delay circuit receives the output signal i of the start code detecting circuit 88 at high level and extends it for a predetermined time td, From this point, a delay of a fixed time td is performed. Thus, by setting the time from the start code to the end code at the time of reproduction as a re-trigger, the end code can be recorded after a certain time from that point even if there is a new cheer between the start code and the end code. it can.

FIG. 15 when the present invention is applied to a VTR.
A ninth embodiment of the present invention will be described with reference to the circuit diagram of FIG. The reproducing device 151, which is a VTR, subjects the video signal and the stereo audio signal recorded on the magnetic tape 152 to a reproduction signal input via the magnetic head 153 by a predetermined signal process, and finally outputs the video signal as an output terminal. 15
4, stereo audio signal output terminals 155a, 155b
Respectively. Of the output signals, the right signal and the left signal of the stereo audio signal are added in anti-phase by the adder 156, the added output is input to one input terminal of the comparator 157, and the other input of the comparator 157 is input. It is compared with the reference voltage Vref input to the terminal. The comparison output is input to the reproduction device 151 via the normal speed reproduction control circuit 158. Further, the comparison output is input to the reproduction device 151 via the delay circuit 159 and the high-speed reproduction control circuit 160.

Next, the operation of the embodiment of FIG. 15 will be described using the operation waveforms of the respective parts a to e of FIG. 15 shown in FIGS. An adder 156 performs anti-phase addition on the right signal and the left signal of the stereo audio signal derived at the output terminals 155a and 155b. This anti-phase addition signal a and the reference voltage Vref
Are compared in level by a comparator 157, and when the anti-phase addition signal a exceeds the reference voltage Vref, the comparison output signal b outputs a high level. The normal speed reproduction control circuit 158 receives the comparison output signal b, and when it is at a high level, outputs the normal speed reproduction control signal d corresponding to the specifications of the reproduction device 151 to put the reproduction device 151 into the normal speed reproduction state. On the other hand, the delay circuit 15
Reference numeral 9 inputs the comparison output signal b, and when it is at a high level, outputs a signal c obtained by extending the high level period by a fixed time td. The high-speed reproduction control circuit 160 receives the signal c in which the high level period is extended and outputs the high-speed reproduction control signal e corresponding to the specifications of the reproduction device 151 to put the reproduction device 151 into the high-speed reproduction state.

In this embodiment, the voices of the announcer whose center is localized can be attenuated by adding the opposite phase of stereo voices to extract the cheers of the audience. When the level of the cheers exceeds the reference level, Therefore, if the normal speed reproduction is performed for a certain time and the other portions are reproduced at high speed, important portions can be selectively reproduced.

A tenth embodiment of the present invention will be described with reference to the operation waveforms of FIG. 17 in the case of the same structure as that of FIG. 15 except that the delay circuit has a retrigger operation.

Parts a to e of FIG. 15 shown in FIGS.
The operation of this embodiment will be described with reference to the operation waveform of FIG. 16, but only the points different from the description of the operation waveform of FIG. 16 will be described here. While the delay circuit 159 receives the high level of the comparison output signal b and delays it for a predetermined time td,
When the comparison output signal b newly becomes high level, a certain time t has passed from the time when the comparison output signal b newly becomes high level.
d can be extended.

In this embodiment, the voice of an announcer or the like is attenuated to extract the cheers of the audience, and normal speed reproduction is performed for a certain period from the time when the level of the cheers exceeds a reference level, and the other portions are reproduced at high speed. Not only can you play the important part selectively, but by re-triggering the setting of the constant speed playback for a fixed time, even if there is a new cheer during the normal speed playback, the normal speed playback will continue for a fixed time from that point. I can continue.

The present invention is not limited to the above embodiments. A band limiting circuit 181 is inserted between the output of the anti-phase adder 16 for stereo signals and one input of the comparator 17, as shown in FIG. You may. This band limiting circuit 181
As a result, it is possible to reduce the influence of noise other than the cheers of the audience, for example, the sound of a musical instrument or ambient noise, and improve the detection accuracy of important scenes. The band limiting circuit 181 is particularly effective if it has a low-frequency attenuation characteristic.

As shown in FIG. 19 which shows only a main part as a twelfth embodiment of the present invention, the output of the anti-phase adder 16 for stereo signals is used as one comparison input of the comparator 16 and the other comparison is performed. The output of the adder 16 may be the output via the integration circuit 191 as the reference voltage input to the input. In this case, it is possible to prevent erroneous detection of variations and fluctuations in the input level of the stereo audio signal.

[0051]

As described above, according to the present invention,
By using the reverse-phase addition signal of the stereo audio signal, the important scene is judged when recording the information and selectively recorded, or the important scene is judged when the information is reproduced and the reproduction speed is automatically controlled. can do.

[Brief description of drawings]

FIG. 1 is a circuit configuration diagram for explaining an embodiment of the present invention.

FIG. 2 is a signal waveform diagram of each unit for explaining the operation of FIG.

FIG. 3 is a signal waveform diagram of each part for explaining the operation of the first other embodiment of the present invention.

FIG. 4 is a circuit configuration diagram for explaining a second embodiment of the present invention.

FIG. 5 is a circuit configuration diagram for explaining a third embodiment of the present invention.

FIG. 6 is a signal waveform diagram of each part for explaining the operation of FIG.

FIG. 7 is a signal waveform diagram of each part for explaining the operation of the fourth embodiment of the present invention.

FIG. 8 is a circuit configuration diagram for explaining a fifth embodiment of the present invention.

9 is a signal waveform diagram of each part for explaining the operation of FIG.

FIG. 10 is a circuit configuration diagram for explaining a sixth other embodiment of the present invention.

11 is a signal waveform diagram of each part for explaining the operation of FIG.

FIG. 12 is a circuit configuration diagram for explaining a seventh other embodiment of the present invention.

13 is a signal waveform diagram of each part for explaining the operation of FIG.

FIG. 14 is a circuit configuration diagram of a main part for explaining an eighth embodiment of the present invention.

FIG. 15 is a circuit configuration diagram of a main part for explaining a ninth embodiment of the present invention.

16 is a signal waveform diagram of each part for explaining the operation of FIG.

FIG. 17 is a circuit configuration diagram of a main part for explaining a tenth embodiment of the present invention.

FIG. 18 is a circuit configuration diagram of a main part for explaining an eleventh embodiment of the present invention.

FIG. 19 is a circuit configuration diagram of a main part for explaining a twelfth embodiment of the present invention.

[Explanation of symbols]

 11 ... Recording device, 12, 13a, 13b ... Input terminal, 14, 54, 82, 83, 153 ... Magnetic head, 15, 84, 152 ... Magnetic tape, 16, 156 ... Adder, 17,157 ... Comparator, Vref ... Reference voltage, 18 ... Recording start control circuit, 19, 121, 159 ... Delay circuit, 20 ... Temporary stop control circuit, 41 ... ...... Signal delay circuit, 51 ... Start code generation circuit, 52,87 ... Code modulation circuit, 53 ... End generation circuit, 81, 151 ... Reproduction device, 85, 86a, 86b .... Output terminal, 88 ... Start code detection circuit, 89 ... End code detection circuit, 158 ... Normal speed reproduction control circuit, 160 ... High speed reproduction control circuit, 181, ... Band limiting circuit, 191 ... ...... Integrator circuit,

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shoichi Ishikawa 8 Shinsita-cho, Isogo-ku, Yokohama-shi, Kanagawa Inside the Multimedia Technology Laboratory, Toshiba Corporation (72) Masatoshi Yamada 8 Shinsugita-cho, Isogo-ku, Yokohama, Kanagawa Banchi Co., Ltd. Inside Toshiba Multimedia Technology Laboratory

Claims (15)

[Claims] 1. A plurality of signals including at least a stereo audio signal to be recorded on a medium, a means for adding the opposite phases of the stereo audio signals, a means for comparing the level of the signals subjected to the reverse phase addition with a set value, A recording apparatus comprising: a unit that controls the start of recording of the plurality of signals based on the comparison result; and a unit that stops recording after a set time has elapsed after the recording was started by the unit. 2. When the control for newly starting the recording is performed during the recording for the set time, the recording stop is controlled after the recording for the set time from the control for starting the last recording. Item 2. The recording device according to item 1. 3. The recording apparatus according to claim 1, further comprising means for delaying a plurality of signals recorded on the medium, and recording the delayed signals. 4. A plurality of signals containing at least a stereo audio signal to be recorded on a medium, a means for adding the opposite phases of the stereo audio signals, a means for comparing the level of the signals added with the opposite phase with a set value. A recording apparatus comprising: a unit for generating a start code according to the comparison result; a unit for generating an end code after a set time; and a unit for recording the start code and the end code together with the plurality of signals on a medium. 5. The end code is generated after the set time has elapsed since the last start code was generated when a new start code is generated during the set time.
Recording device described in. 6. A means for detecting a start code and an end code recorded on a medium, and a reproduction speed different between a period from the detection of the start code to the detection of the end code and a period other than the period. The reproducing apparatus according to claim 4, wherein: 7. A plurality of signals containing at least a stereo audio signal to be recorded on a medium, a means for adding the opposite phases of the stereo audio signals, a means for comparing the level of the signals subjected to the opposite phase addition with a set value, A recording apparatus comprising: a unit for generating a start code based on the comparison result; and a unit for recording the start code on a medium together with the plurality of signals. 8. A means for detecting a start code recorded on a medium, and a reproduction speed being made different between a period of a fixed time after the detection of the start code and a period other than that. Playback device described. 9. When a new start code is detected within the fixed time period, reproduction is performed in the fixed time period after the detection of the first start code and after the detection of the last start code and in the other period. 9. The reproducing apparatus according to claim 8, wherein the reproducing speed is different. 10. A means for reproducing a plurality of signals including at least a stereo audio signal, a means for performing an anti-phase addition on the stereo audio signals, and a means for comparing the level of the anti-phase added signals with a set value. A reproducing apparatus comprising means for controlling to a first reproducing speed based on the comparison result, and means for controlling to a second reproducing speed after reproducing at the first reproducing speed for a set time. 11. When the control for newly setting the first reproduction speed is performed during reproduction at the first reproduction speed, the last first reproduction speed is set.
11. The reproducing apparatus according to claim 10, further comprising means for controlling the reproduction speed from the reproduction speed to the second reproduction speed after the reproduction is performed at the first reproduction speed for the set time. 12. A plurality of signals including at least a stereo audio signal to be recorded on a medium, a means for adding the opposite phases of the stereo audio signals, a means for comparing the level of the opposite-phase added signals with a set value, Means for generating a start code according to the comparison result, means for generating an end code after a set time, means for recording the start code and the end code together with the plurality of signals on a medium, and a means for recording on the medium at the time of reproduction A recording / reproducing apparatus, characterized in that a means for detecting a start code and an end code, and a reproduction speed different between a period from the detection of the start code to the detection of the end code and a period other than the period. 13. The band limitation of the signal subjected to the anti-phase addition is performed, and the level of the band limited signal is compared with the set value.
The recording / reproducing apparatus according to any one of 1. 14. The recording / reproducing apparatus according to claim 1, wherein the set value is an average value or an effective value of signal levels to be compared. 15. The recording / reproducing apparatus according to claim 1, wherein the signals recorded on the medium are stereo audio signals and video signals.