JP2762250B2 - Recording and playback device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording / reproducing apparatus for recording / reproducing audio for a fixed time, and more particularly, to a reproducing speed of a sound being reproduced by various players for reproducing video and audio from a position before a predetermined time. The present invention relates to a recording / reproducing apparatus capable of performing reproduction by changing a recording / reproducing method.

[0002]

2. Description of the Related Art When a video cassette recorder (VCR), a video CD player (VCD player), or the like is playing back video and audio, it is difficult to hear a certain part or want to check the pronunciation in detail. There is. In such a case, confirmation has been performed by rewinding for a certain time and then reproducing the same portion again.

[0003] However, in a normal VCR or VCD player, the reproduction speed while outputting sound is constant, so that it is often necessary to repeatedly reproduce a portion that is difficult to hear.

[0004]

When such a general device is used, there is a problem that the reproduction speed cannot be changed. It is also conceivable to record only the audio on another tape recorder etc. and play it at low speed.
A new problem arises in that the pitch decreases as the speed decreases.

[0005] Further, there is a problem that the operation of returning and reproducing is required many times, and the operation itself is complicated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has as its object the purpose of facilitating return and playback operations for a certain period of time, and adjusting the playback speed in order to easily and reliably grasp the playback contents. It is an object of the present invention to realize a recording / reproducing apparatus which can be arbitrarily selected and which can reproduce even when the reproduction speed is changed, without changing the sound pitch.

[0007]

Means for Solving the Problems The inventors of the present application have conducted intensive studies to improve the problem of the complexity of operation and the problem of the reproduction speed of the conventional video and audio reproducing apparatus, and as a result, the inventors have found that certain problems have been solved. The present invention has been completed by finding a new method capable of performing reproduction at a variable speed with respect to time without changing the pitch.

Accordingly, the present invention, which is a means for solving the above-mentioned problems, is configured as described below.

That is, a first aspect of the present invention is a recording / reproducing apparatus used with a player for reproducing video and audio, which records the latest fixed time of the audio reproduced from the player and sets a desired set speed. Recording / reproducing means for performing reproduction in accordance with, pitch control means for receiving information on the speed at which the recording / reproducing means reproduces sound so as to adjust to the same pitch as at the time of recording, and receiving an instruction for variable speed recording / reproduction Giving an instruction to the recording / reproducing means to reproduce the recording sound for the predetermined time at a desired set speed, giving reproduction speed information to the pitch control means, and giving the player And a control means for giving an instruction to reproduce the video at a predetermined speed equivalently to the return instruction.

In the recording / reproducing apparatus according to the first invention, the recording / reproducing means records the latest predetermined time of the voice reproduced from the player. When there is an instruction for variable speed recording / reproduction, the control means gives the recording / reproduction means an instruction to reproduce the recording sound for the predetermined time at a predetermined low speed, and gives the pitch control means a reproduction speed adjustment. The information is given, and the player is given a return instruction for a certain period of time and an instruction to reproduce the video at a predetermined low speed equivalently. As a result, the recording / reproducing means reproduces the recorded voice at the low speed instructed by the control means, and the pitch control means adjusts the pitch of the voice so as to be the same as that at the time of recording.
Further, after the player returns for a certain period of time, the player reproduces the video at the equivalently instructed low speed.

In this case, the reproduction of the equivalent low-speed video of the player is equivalent to a reproduction (stop) at a fixed interval, and a repetition of the reproduction and the stop at a short interval. Means to look lower.

As a result, it is easy to perform the operation of returning or playing back for a certain period of time, and it is possible to arbitrarily select the playback speed in order to easily and surely grasp the playback contents. Thus, it is possible to realize a recording / reproducing apparatus capable of performing reproduction without changing the pitch of the voice even when the reproduction is performed.

According to a second aspect of the present invention, there is provided a recording / reproducing apparatus used with a player for reproducing video and audio.
A recording / reproducing means for recording the latest fixed time of the sound reproduced from the player and reproducing the sound in accordance with a desired set speed; and receiving the information on the speed at which the recording / reproducing means reproduces the sound, and Pitch control means for adjusting to a pitch, extraction means for extracting a predetermined component included in the recorded and reproduced sound whose pitch has been adjusted, and a variable speed recording / reproduction instruction, and An instruction to reproduce the recording sound for the predetermined time at a desired set speed is given thereto, and information on a reproduction speed is given to the pitch control means,
Control means for giving the player a return instruction for the predetermined time and an instruction for reproducing an image at a predetermined speed equivalently.

In the recording / reproducing apparatus according to the second aspect of the present invention, the recording / reproducing means records the latest fixed time of the voice reproduced from the player. When there is an instruction for variable speed recording / reproduction, the control means gives the recording / reproduction means an instruction to reproduce the recording sound for the predetermined time at a predetermined low speed, and gives the pitch control means a reproduction speed adjustment. The information is given, and the player is given a return instruction for a certain period of time and an instruction to reproduce the video at a predetermined low speed equivalently. Thereby, the recording / reproducing means reproduces the recorded voice at the low speed instructed by the control means, and the pitch control means performs adjustment so that the pitch of this voice becomes the same as at the time of recording,
The extracting means extracts and outputs a predetermined component of the voice. Further, after the player returns for a certain period of time, the player reproduces the video at the equivalently instructed low speed.

In this case, the reproduction of an equivalent low-speed video of the player is equivalent to the reproduction speed equivalent to the reproduction (stop) being repeated at short intervals by stopping (pausing) at a constant interval. Means to look lower. Further, the extraction by the extracting means means an extraction according to a frequency characteristic, an extraction by addition / subtraction of a phase, and the like.

As a result, it is easy to perform the operation of returning or playing back for a certain period of time, and it is possible to play back at a reduced playback speed.
In addition, it is possible to realize a recording / reproducing apparatus capable of reproducing a desired component without changing the pitch of the sound even when the reproduction speed is changed.

[0017]

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

FIG. 1 is a configuration diagram showing a configuration of a recording / reproducing apparatus 20 of the present invention together with a player 10.

In FIG. 1, the player 10 corresponds to various playback devices capable of playing back video and audio such as video tapes and video CDs. The player 10 has a reproducing means 10a and a communication means 10b for receiving an external command. The reproducing means 10a is a conventional general one having a fixed reproducing speed, and is temporarily stopped (paused).
Is possible.

The recording / reproducing apparatus 20 is an apparatus which can record the sound from the player 10 for a certain period of time and reproduce it at a variable speed as required and can be composed of the following parts. .

The A / D converter 20a converts an analog audio signal from the player 10 into a digital signal. The recording / reproducing means 20b is capable of recording the latest fixed time of the audio digital signal and reproducing it at a desired set speed. Note that the certain time during which the recording / reproducing means 20b can record data is determined by the use and the cost of the apparatus. In the following specific example, 30 seconds will be described as an example.

The pitch control unit 20c stores information on the speed at which the recording / reproducing means 20b reproduces the sound.
h, adjustment of the pitch at the time of reproduction is performed so that the pitch is the same as that at the time of recording of the voice. D / A conversion means 2
0d is for converting a digital signal of a reproduced and pitch-adjusted sound into an analog signal.

The equalizer 20e adjusts frequency characteristics to pass or attenuate a specific frequency component. The switch 20f is switching means for selectively passing the sound from the player 10 and the sound recorded and reproduced by the apparatus. The amplifier 20g amplifies the sound and outputs the amplified sound to the external speaker 30, and the control unit 20h
Has the function of adding / subtracting the left and right signal components in response to an instruction from The equalizer 20e and the amplifier 2
Since the frequency component and the phase component can be extracted with 0 g, an extraction unit is configured.

The control means 20h is for giving instructions and information to the above-described units and controlling the recording and reproducing operations. The operation unit 20i is an instruction input unit that receives an instruction from a user (operator), and can receive a remote control operation in addition to a direct switch operation. The communication means 20j is for transmitting a part of the instruction from the control means 20h to the player 10.

The operation of the recording / reproducing apparatus thus configured is as follows. Here, description will be made with reference to the flowchart of FIG. 2 and the time chart of FIG.

[Normal Playback] The player 10 plays back normal video and audio (step (2) in FIG. 2). At this time, the switch 20f in the recording / reproducing apparatus 20 is in a state of outputting the input sound as it is, and the input sound is amplified by the amplifier 20g and output from the speaker 30.

[Preparation for recording / reproduction] In parallel with the above-mentioned normal reproduction (step (2) in FIG. 2), the recording / reproduction means 20b in the recording / reproduction device 20 records the latest fixed time (for example, 30 seconds) in the memory. (Step (3) in FIG. 2).

[Low-speed reproduction by recording / reproduction] Player 10
When the user wants to repeat the listening during the reproduction of, the recording / reproducing instruction is issued from the operation means 20i. The operation means 20i having received the instruction notifies the control means 20h that the recording / reproduction instruction has been issued (step (3) in FIG. 2).

The control means 20 receiving the recording / reproducing instruction
h executes the following processes, and each unit receiving an instruction from the control unit 20h operates according to the instruction. It instructs the recording / reproducing means 20b to stop recording (step (4) in FIG. 2). It instructs the reproduction means 10b in the player 10 to return the reproduction position by the above-mentioned fixed time (30 seconds) (step (5) in FIG. 2). This instruction reaches the reproducing unit 10a from the control unit 20h via the communication unit 20j to the communication unit 10b. The reproduction speed data stored in a table or the like in the control means 20h is read (step (6) in FIG. 2). The reproduction speed is a speed at which reproduction is performed when the above-mentioned recording / reproduction (variable speed recording / reproduction) is instructed, and is slightly lower than a normal reproduction speed. The purpose of such low-speed reproduction is to improve the audibility. For example, in the first reproduction, the speed is -30% higher than normal, in the second reproduction, the speed is -20% higher than normal,
In the second reproduction, the speed is -10% faster than usual. Then, the reproduction speed data is given to the recording / reproduction means 20b. An instruction is given to the recording / reproducing means 20b to reproduce the recorded audio for a fixed period of time at the set speed (step (7) in FIG. 2). Further, the switch 20f is switched to the equalizer 20e. The reproduction means 10b in the player 10 is equivalently instructed to reproduce the video at the predetermined speed (step (8) in FIG. 2). Here, the recording / reproducing means 20
As an instruction to make it possible to easily achieve synchronization even with a player that can only reproduce at a fixed speed so that a video that matches the reproduction speed of the sound from b can be reproduced, pause (pause) at regular intervals. Give instructions.

By performing the variable speed reproduction as described above, the reproduction of the video and the low-speed sound is performed for a certain period immediately before the instruction by the operator. Incidentally, the recording / reproducing means 2
0b, the pitch of the sound reproduced from 0b decreases in accordance with the speed.
h, the lowered pitch is raised in response to, for example, a 20% reduction in speed. As a result, the sound is reproduced at the same pitch as that at the time of recording, and only the speed is reduced, so that the audibility is improved as compared with the reproduction in which the speed is simply changed.

When the sound recorded in the recording / reproducing means 20b has been reproduced at a low speed, the low-speed reproduction may be repeated again without returning to the normal speed reproduction of the player 10. In such a case, the reproduction speed and the number of repetitions are controlled by the control means 20.
h is stored in the table.

For example, first, low-speed reproduction is performed at -30% for 30 seconds at the first time, and the corresponding portion of the target reproduction portion is substantially output, and then at the second time, low-speed reproduction is performed at -20% for 20 seconds. And then perform a third low-speed reproduction at a speed of -10% for 20 seconds.

When such repetition is performed, a return instruction of 20 seconds is given to the reproduction means 10b (step (9) in FIG. 2), and the reproduction speed setting and the reproduction of the video and audio are repeated (FIG. 2). 2 steps (6) to (8)).

FIG. 3 shows this repeated low-speed reproduction. In FIG. 3, according to the above-described example, upon receiving an instruction at the time of normal reproduction, the first reproduction is performed at a low speed of -30% for 30 seconds, and the second reproduction is performed at a speed of -20% corresponding to the desired reproduction portion. The low-speed reproduction is performed for the reproduction time, for example, 20 seconds, and the third reproduction is performed at a low speed of -10% for 20 seconds. Then, a state in which the process returns to the normal reproduction after that is shown.

In the above case, the reproduction is shifted to the low-speed reproduction at the time when the instruction is given from the operation means 20i. However, the present invention is not limited to this. That is, it is also possible to detect the audio level, continue normal reproduction until the audio is interrupted, and shift to low-speed reproduction at the timing when the audio is interrupted. In this case, the control means 20h may perform monitoring by adding a means for monitoring the audio level. It is also conceivable that the operation is shifted to the low-speed reproduction after a predetermined number of seconds in response to an instruction from the operation means 20i.

When performing low-speed reproduction, it is also possible to extract a desired audio component by adjusting the frequency characteristics and phase characteristics. For example, as shown in FIG.
When the entire audio signal has a characteristic like a broken line, only a part of the frequency is passed as shown by a solid line. Here, it is possible to extract mainly human voice by passing about 1 kHz to 6 kHz.

It is also possible to prepare a plurality of these frequency bands in advance and select them, or to move them as necessary as shown in FIG. 4B. Such processing is performed by the control unit 2 in accordance with an instruction from the operation unit 20i.
0h causes the equalizer 20e to perform.

It is also conceivable that the amplifier 20g adds the left and right signal components in accordance with an instruction from the control means 20h in order to effectively extract a human voice or the like included near the center of the stereo music. As a result, the left and right signal components having a phase difference are canceled, and a human voice or the like located near the center remains. Conversely, by subtracting the left and right signal components, it is possible to eliminate human voices and extract sounds of surrounding musical instruments. By performing such extraction processing,
The effect of the low-speed reproduction described above is added, so that it becomes easier to hear.

[0039]

As described in detail above, in the present invention,
Record the latest fixed time of the sound reproduced from the player, and when instructed, play the recorded sound for the fixed time at a predetermined low speed, adjust the pitch, and output it. The video is synchronously reproduced at a predetermined low speed equivalently.

As a result, it is easy to perform the operation of returning or playing back for a certain period of time, and it is possible to arbitrarily select the playback speed in order to easily and surely grasp the playback contents. Thus, it is possible to realize a recording / reproducing apparatus capable of performing reproduction without changing the pitch of the voice even when the reproduction is performed.

Also, by performing extraction according to the frequency characteristics and extraction by adding / subtracting the phase at the time of low-speed reproduction, it is possible to extract a desired component of the sound and make the content more audible. Become.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a configuration of a recording / reproducing apparatus of the present invention.

FIG. 2 is a flowchart showing an operation state of the recording / reproducing apparatus of the present invention.

FIG. 3 is a time chart showing an operation state of the recording / reproducing apparatus of the present invention.

FIG. 4 is an explanatory diagram showing a state of extraction by frequency at the time of audio reproduction.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Player 10a Reproduction means 10b Communication means 20 Recording / reproducing apparatus 20a A / D conversion means 20b Recording / reproduction means 20c Pitch control part 20d D / A conversion means 20e Equalizer 20f Switch 20g Amplifier 20h Control means 20i Operation means 20j Communication means 30 Speaker

──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Shinji Tanaka 7-3-5-1 Sagami Ono, Sagamihara City, Kanagawa Prefecture Inside Marantz Japan (72) Inventor Hidetoshi Hamaura 7-35-1 Sagami Ono, Sagamihara City, Kanagawa Prefecture Marantz Japan Inspector in Japan Co., Ltd. Hiromasa Nakano (56) References JP-A-57-189307 (JP, A) JP-A-8-293137 (JP, A) JP-A-1-78361 (JP, U) (58) Field (Int.Cl. ⁶ , DB name) G11B 20/02 G11B 15/02 310

Claims (2)

(57) [Claims] 1. A recording / reproducing apparatus used with a player for reproducing video and audio, the recording / reproducing recording the latest constant time of audio reproduced from the player and reproducing the audio at a desired set speed. Means, pitch control means for receiving information on the speed at which the recording / reproducing means reproduces the sound and adjusting the pitch to the same pitch as at the time of recording, and receiving an instruction for variable speed recording / reproducing, the recording / reproducing means In response to this, an instruction to reproduce the recording sound for the predetermined time at a desired set speed is given, information on a reproduction speed is given to the pitch control means, and a return instruction for the certain time is given to the player and the equivalent. And a control unit for giving an instruction to reproduce a video at a predetermined speed to the recording / reproducing apparatus. 2. A recording / reproducing apparatus used together with a player for reproducing video and audio, the recording / reproduction recording the latest constant time of the audio reproduced from the player and reproducing the audio at a desired set speed. Means, pitch control means for receiving information on the speed at which the recording / reproducing means reproduces the sound, and adjusting the pitch to be the same as that at the time of recording; and a predetermined pitch contained in the recorded and reproduced sound whose pitch has been adjusted. Extracting means for extracting a component, receiving an instruction for variable speed recording / reproduction, giving an instruction to the recording / reproduction means to reproduce the recording sound for the predetermined time at a desired set speed, and to the pitch control means Control means for giving information on the playback speed by means of a predetermined time and giving the player a return instruction for the predetermined time and an instruction for equivalently reproducing the video at a predetermined speed. Raw devices.