JP3332667B2 - Video tape recorder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video tape recorder (VTR).

[0002]

2. Description of the Related Art In recent years, video tape recorders capable of reproducing normal speed sound even at the time of double speed reproduction have been marketed.

[0003]

The above-mentioned VTR
However, there is no device in which normal-speed sound can be obtained at the time of high-speed reproduction at twice or higher speed, and there is no device that converts normal speed sound of 1-times speed into a slower sound speed.

[0004] Accordingly, the present invention is to propose a new VTR in which such a point is improved.

[0005]

SUMMARY OF THE INVENTION The present invention provides an EE audio signal input means, an audio signal reproduction means, an EE audio signal obtained from the EE audio signal input means, and an audio signal reproduction apparatus. First switch means for selecting and outputting any of the reproduced audio signals obtained from the means, and removing a silent section of the audio from the output audio signal of the first switch means;
Voice conversion means for expanding the voice of the voiced section on the time axis;
A second switch for selecting and outputting one of a reproduced sound signal obtained from the sound signal reproducing means, an output sound signal of the sound converting means, and an EE obtained from the EE sound signal input means. A video tape recorder comprising an audio signal and third switch means for selecting and outputting one of the output audio signals from the second switch means.

[0006]

[0007]

According to the above configuration, the audio signal obtained from the video can be heard with a slow voice, and the configuration is simple.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an audio reproducing system of a VTR according to the present invention. An audio signal reproduced from an audio track (horizontal track) of a video tape T by an audio head 1 is passed through an equalizer amplifier 2. EE / reproduction input selection switch circuit (first switch) 3 is applied to one input. The EE signal is a through signal that is not modulated for recording.

A voice EE signal from a voice EE input terminal 12 is supplied to the other input of the input switching circuit 3. The audio EE signal is an audio signal obtained from a tuner, an audio signal obtained from a microphone, or an audio signal obtained from an external device such as a video disk player or another video tape recorder.

The signal selected by the first switch 3 is input to a speech speed conversion circuit unit 5 via a buffer amplifier 4.
Here, after a speech speed conversion process described later is performed and supplied to a low-pass filter (LPF) 58, it is supplied to one input of a normal reproduction speech / speech speed conversion speech switch (second switch) 7.

The output of the equalizer amplifier 2 is supplied to the other input of the second switch 7 via the buffer amplifier 6. Therefore, the second switch 7 selects one of the reproduced audio signal obtained from the equalizer 2 and the audio signal subjected to the speech speed conversion processing, and supplies the selected signal to one input of an EE / reproduction output switch (third switch) 8. Given.

An EE audio signal supplied to a terminal 12 is supplied to the other input of the third switch 8, and the third switch 8 selects the EE audio and the output of the second switch 7, Output to the mute circuit 9. The signal output from the mute circuit 9 is output via a line amplifier 10 to an external device, for example, a television receiver.

13 is a microcomputer (microcomputer)
The microcomputer 13 allows the first, second,
The third switches 3, 7, 8 and the speech speed conversion circuit 5 are controlled.

The speech speed conversion circuit 5 is composed of LC85400E manufactured by Sanyo Electric Co., Ltd., and basically comprises a bus line 50 and a microcomputer interface 5.
1, memory interface 52, clock generator 5
3. An ALC amplifier 54, an A / D converter 55, a DSP (digital signal processor) 56, and a D / A converter 57. The memory interface 52 exchanges data with an external memory (dynamic RAM). Do.

The speech speed conversion circuit section 5 causes the microcomputer 13 to change the voice reproduction speed. That is, the level of the audio signal input to the speech speed conversion circuit unit 5 is adjusted by an ALC (automatic level control) amplifier 54 to a level suitable for A / D conversion, and the A / D converter 55 converts the audio signal into a digital signal. After the conversion, the DSP 56 writes the data to the memory 11 via the interface 52 and reads the data from the memory 11. The digital signal read from the memory is converted into a digital signal by the D / A converter 57.
After the conversion, the signal is converted into an analog signal and output to the LPF 58. At this time, the DSP 56 adjusts the writing speed of the audio data to the memory 11 so that when the data is read with a constant clock at the time of reading, a voice whose speech speed has been converted can be obtained.

Next, the operation when the speech speed conversion circuit unit 5 enters the slow mode will be described with reference to FIG. 2. When the EE sound or the reproduced sound at the normal speed is output as shown in FIG. At time T, a voice "speech rate conversion applied to VTR" is reproduced, and when the speech rate conversion in the slow mode is performed on this voice, as shown in FIG. 2), the silent sections Tx, Ty and Tz in FIG.
As shown in (b), each of "speech rate conversion", "applied to VTR", and "technique" is expanded, and as a result, "speech rate conversion is a technique applied to VTR" is slow as a whole. That is, the user can hear the sound at the set speed.

Next, the operation when the EE audio signal supplied to the terminal 12 is viewed in the slow mode will be described. In the slow mode, the microcomputer 13 sets the first switch 3 to the E-
Switching is performed so as to select the E audio signal. Therefore, the first
The switch 3 outputs an EE audio signal, which is supplied to the speech speed conversion circuit unit 5 via the buffer amplifier 4. At this time, the speech speed conversion circuit 5 is set by the microcomputer 13 so as to be in the slow mode. After the EE voice signal is subjected to the above-described speech speed conversion processing in the speech speed conversion circuit section 5, the LP
It is supplied to the second switch 7 via F58.

The second switch 7 is controlled by the microcomputer 5
Since the setting is made so as to select the output of F58, the voice signal whose speech speed has been converted is input to the third switch 8. At this time, the third switch 8 selects the output of the second switch 7. Therefore, the third switch 8 outputs an audio signal whose speech speed has been converted to the slow mode, which is supplied to the line amplifier 10 through the mute circuit 9 and amplified and output.

When the EE voice is to be viewed as it is without converting the speech speed, the microcomputer 13 controls the third switch 8
Is switched so as to select the terminal 12, and when the reproduced sound from the tape is viewed without converting the speech speed, the second switch 7 is switched so as to select the output of the buffer amplifier 6 and the third switch is switched. The microcomputer 8 is controlled so that the switch 8 is switched so as to select the output of the second switch 7.

When the reproduced audio signal from the tape is viewed in the slow mode, the microcomputer 13 switches so that the first switch 3 selects the output of the equalizer amplifier 2. Accordingly, the first switch 3 outputs a reproduced audio signal of the tape, which is supplied to the speech speed conversion circuit unit 5 via the buffer amplifier 4. At this time, the speech speed conversion circuit 5 is set by the microcomputer 13 so as to be in the slow mode.
The audio signal reproduced from the tape is supplied to the second switch 7 via the LPF 58 after the above-mentioned audio speed conversion processing is performed by the audio speed conversion circuit unit 5. Since the second switch 7 is set by the microcomputer 13 so as to select the output of the LPF 58, the reproduced voice signal of the tape whose speech speed has been converted is input to the third switch 8. At this time, the third switch 8 Since the output of the second switch 7 is selected,
The third switch 8 outputs an audio signal whose speech speed has been converted to the slow mode, which is supplied to the line amplifier 10 via the mute circuit 9 and amplified and output.

With the above-described configuration, the normal EE audio, the EE audio whose speech speed has been converted, the normal tape playback audio, and the tape playback audio whose speech speed has been converted can be converted into one audio amplifier. Since the signal can be amplified by 10, the number of parts can be reduced and the circuit configuration is simple.

[0023]

As described above, according to the present invention, there is an advantage that the EE sound can be viewed at a slow speed by the video tape recorder, and the circuit configuration thereof can be easily realized.

[Brief description of the drawings]

FIG. 1 is a main block diagram of a video tape recorder embodying the present invention.

FIG. 2 is a diagram showing an example of an operation description of a video tape recorder embodying the present invention.

[Explanation of symbols]

 T video tape 1 magnetic head 3 first switch 5 speech speed conversion circuit section 7 second switch 8 third switch 10 line amplifier 11 memory 12 EE audio signal input terminal

Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) G11B 20/02 G10L 21/04 H04N 5/928-5/93

Claims (6)

(57) [Claims] 1. An EE audio signal input unit, an audio signal reproducing unit, an EE audio signal obtained from the EE audio signal input unit, and a reproduced audio signal obtained from the audio signal reproducing unit. First switch means for selecting and outputting one of them; and sound conversion means for removing a silent section of the sound from the output sound signal of the first switch means and extending the sound in the sound section on the time axis. A second switch unit for selecting and outputting one of a reproduced audio signal obtained from the audio signal reproducing unit and an output audio signal of the audio converting unit; and an E-E obtained from the EE audio signal input unit. A video tape recorder comprising: an E audio signal; and third switch means for selecting and outputting one of the output audio signals of the second switch means. 2. The video tape recorder according to claim 1, wherein the audio signal is a reproduction audio of a video tape recorder. 3. The video tape recorder according to claim 1, wherein the audio signal is an EE audio signal obtained by a video tape recorder. 4. The video tape recorder according to claim 1, wherein the EE audio signal is an audio signal obtained from a tuner. 5. The video tape recorder according to claim 1, wherein the EE audio signal is an audio signal obtained from a microphone. 6. The video tape recorder according to claim 1, wherein the EE audio signal is an audio signal obtained from an external device.