JP3306269B2 - Audio signal playback device and video / audio equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to an audio signal reproducing apparatus used for a video tape recorder (VTR) or the like.

[0002]

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

[0003]

By the way, in a video / audio device such as a VTR, when a television program or the like is viewed in the EE mode, only a sound is recorded for a certain period of time as if a memo was taken. It would be extremely useful to be able to play it back and catch the information from the program without fail.

Accordingly, an object of the present invention is to enable such a function to be realized without incurring an increase in cost.

[0005]

SUMMARY OF THE INVENTION The present invention comprises a memory for storing an input audio signal, and control means for controlling writing and reading of the audio signal to and from the memory, wherein the control means updates the memory. Is set to the first mode in which the input audio signal is always written, and the writing of the audio signal to the memory is stopped by the first operation, and the audio signal stored in the memory is stopped before the writing is stopped. In the audio signal reproducing apparatus which is set to a second mode for repeatedly reading, and which is set from the second mode to the first mode by a second operation, the input audio signal is a video tape recorder, a television receiver It is an EE audio signal obtained from a tuner provided in a video / audio device such as the above.

According to the present invention, the speech speed conversion processing by compression / decompression and / or deletion processing on the input audio signal is performed according to whether the input audio signal is an audio section or a silent section. A video / audio device, such as a video tape recorder, provided with a speech speed conversion processing unit controlled by a control unit, wherein the control unit sets the memory to a first mode in which the latest input audio signal is always written. At the same time, the writing of the audio signal to the memory is stopped by the first operation, and the second mode is set so that the audio signal stored in the memory is repeatedly read out before the writing is stopped. In a video / audio device such as a video tape recorder set from the second mode to the first mode, the input audio signal is Characterized in that it is a EE audio signal obtained from the tuner provided within the video / audio equipment such as a precoder.

[0007]

[0008]

[0009]

An 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 transmitted through an equalizer amplifier 2. EE / reproduction input selection switch circuit (first switch circuit) 3 is applied to one input.

The EE signal is a signal that directly outputs the input baseband signal, and is an unmodulated signal.

A voice EE signal from the fourth switch circuit 15 is supplied to the other input of the first switch circuit 3. The audio EE signal is an audio signal obtained from an external device such as another video tape recorder provided to the terminal 12 or an audio signal obtained from the tuner 15. That is, when the fourth switch circuit 15 selects the terminal a, an audio signal from an external device is output from the switch circuit 15, and when the terminal b is selected, an audio signal from the tuner / IF circuit 16 is output.

The signal selected by the first switch circuit 3 is input to a speech speed conversion circuit unit 5 via a buffer amplifier 4, where the signal is subjected to a speech speed conversion process described later and supplied to a low-pass filter (LPF) 58. Switch circuit (second switch circuit) for normal reproduction voice / speech rate converted voice
7 is supplied to one input.

The output of the equalizer amplifier 2 is supplied to the other input of the second switch circuit 7 via the buffer amplifier 6. Therefore, the second switch circuit 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 selects one of the EE / reproduction output switching switch circuit (third switch circuit) 8. Is given to the input.

An EE audio signal obtained from a fourth switch circuit 15 is supplied to the other input of the third switch circuit 8, and the third switch circuit 8 is connected to the EE audio signal and the second switch circuit 7. And outputs it 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 and fourth switch circuits 3, 7, 8, 15 and the speech speed conversion circuit 5 are controlled. The microcomputer 13 includes a tuning unit 17.
, Whereby the tuner 16 selects a channel.

The speech speed conversion circuit section 5 is composed of LC85400E manufactured by Sanyo Electric Co., Ltd.
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) 11. I do. The speech speed conversion circuit unit 5 performs speech speed conversion by controlling the writing speed of the memory 11 as described later (the reading speed is constant), but the memory 11 is called a ring memory. The ring memory is a memory having a ring structure, and the ring structure is a memory in which the pointer of the last item of the chained list points to the first item.

The speech speed conversion circuit 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, E supplied from the fourth switch 15
An operation in the case of viewing the E audio signal in the slow mode will be described. In the delay mode, the microcomputer 13 switches so that the first switch circuit 3 selects the EE audio signal. Therefore, the first switch circuit 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. E
The -E audio signal is supplied to the second switch circuit 7 via the LPF 58 after the above-mentioned speech speed conversion processing is performed in the speech speed conversion circuit unit 5.

Since the second switch circuit 7 is set by the microcomputer 5 so as to select the output of the LPF 58, the voice signal whose speech speed has been converted is inputted to the third switch circuit 8. At this time, the third switch circuit 8 is used. Since the circuit 8 selects the output of the second switch circuit 7, the third
The switch circuit 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.

When the EE voice is to be viewed as it is without performing the speech speed conversion, the microcomputer 13 switches the third switch circuit 8 so as to select the output of the fourth switch circuit 15, and outputs the signal from the tape. When the reproduced voice is viewed without converting the voice speed, the second switch circuit 7 is switched to select the output of the buffer amplifier 6 and the third switch circuit 8 selects the output of the second switch circuit 7. Is controlled by the microcomputer 13 so as to be switched.

When the 1x speed reproduced audio signal from the tape is viewed in the slow mode, the microcomputer 13 switches so that the first switch circuit 3 selects the output of the equalizer amplifier 2. Therefore, the first switch circuit 3 outputs a reproduced audio signal of the tape, and this 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 circuit 7 through 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 circuit 7 is set by the microcomputer 13 so as to select the output of the LPF 58, the audio signal of the tape whose speech speed has been converted is input to the third switch circuit 8.
At this time, since the third switch circuit 8 selects the output of the second switch circuit 7, the third switch circuit 8 outputs an audio signal whose speech speed has been converted to the slow mode, and this is a mute circuit. The signal is supplied to a line amplifier 10 via an amplifier 9 and output after amplification.

Now, when the user inputs the E
-Consider the case where the user is watching the E sound. That is, in the delay mode described above, the fourth switch 15 selects the terminal b, and the first switch 3 selects the output of the fourth switch 15.

In this state, the writing and reading of the audio signal to and from the memory 11 are controlled by the microcomputer 13, but the microcomputer 13 always writes the latest input audio signal to the memory 11 ( First mode).

That is, in the first mode, the operation of discarding old audio signal information and writing new audio signal information is repeated so that the contents of the memory always become the latest audio signal information.

The user presses the memo button 22 when there is audio information to be temporarily recorded while watching the program while watching the TV monitor screen. The memo button is in a toggle format. When the memo button is pressed once, the microcomputer 13 receives the key input.
1. Control the memory 11 through the memory interface 52 to stop writing the EE audio signal to the memory 11 and to repeatedly read the audio signal stored in the memory before the writing is stopped. Set (second mode). As a result, the audio signal for several seconds recorded in the memory 11 is output from the speech speed conversion circuit unit 5 to the LPF 58 repeatedly at a slow speed. At this time, the second switch 7 has selected the output of the LPF 58, and the third switch 8 has selected the output of the second switch 7. Therefore,
The repetitive sound is output via the third switch 8, the mute circuit 9, and the line amplifier 10.

When the user presses the memo button 22 again in this state, the microcomputer 13 receives the key input and returns from the second mode to the first mode. You can continue to watch the program.

In the above description, a case was described in which the sound was repeatedly reproduced in the slow mode.
When the memo button 22 is pressed in the mode for listening to the −E audio signal, the voice at the normal speed may be reproduced from the memory 11 without the voice speed being converted by the voice speed conversion circuit unit 5.

It goes without saying that the memo button 22 may be provided not on the VTR main body but on the remote control transmitter.

[0031]

As described above, according to the present invention, in a video / audio device such as a VTR, when a television program or the like is viewed in the EE mode, the user can take a memo by pressing the button once. To record only audio for a certain amount of time,
Since it can be reproduced repeatedly, information obtained from the program can be reliably caught and the function of this kind of video / audio equipment can be improved.

At this time, in a video / audio device such as a VTR, a speech speed conversion function is also made to work.
Since the voice can be repeated at a slow speed, the information can be more reliably caught.

Further, since the memory used for repeatedly reproducing the voice is also used as the memory for speech speed conversion, it can be realized without incurring a significant cost increase.

[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 circuit 5 speech speed conversion circuit section 7 second switch circuit 8 third switch circuit 10 line amplifier 11 memory 12 EE audio signal input terminal 13 microcomputer 15 fourth switch 22 memo button

Claims (2)

(57) [Claims] 1. A memory for storing an input audio signal, and control means for controlling writing and reading of the audio signal to and from the memory, wherein the control means always writes the latest input audio signal to the memory. Set the first mode and set the second mode to stop the writing of the audio signal to the memory by the first operation and repeatedly read the audio signal stored in the memory before the stop of the writing. And
In the audio signal reproducing apparatus configured to set the second mode to the first mode by a second operation, the input audio signal is provided to a video / audio device such as a video tape recorder and a television receiver. An audio signal reproducing device, which is an EE audio signal obtained from a tuner. 2. A speech speed conversion process by compression / decompression and / or deletion of the input voice signal according to whether the input voice signal is a voice section or a silent section. A video / audio device such as a video tape recorder provided with a speech speed conversion processing unit that performs control, wherein the control unit sets the memory to a first mode in which the latest input audio signal is always written, Setting the second mode in which the writing of the audio signal to the memory is stopped by the operation of 1 and the audio signal stored in the memory is repeatedly read out before the writing is stopped;
The video / video of a video tape recorder or the like, which is set from the second mode to the first mode by a second operation
In the audio equipment, the input audio signal is obtained from a tuner provided inside a video / audio equipment such as the video tape recorder.
A video / audio device such as a video tape recorder, which is an E audio signal.