JP2003061025A - Video-integrated television receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a video incorporated television receiver that avoids amplification of high-frequency signals which is not recorded on a video tape by interrupting the high-frequency, when reproducing the normally recorded video tape so that the harsh high frequency noise is not outputted from a loudspeaker and can reproduce a high fidelity recorded sound signal, without losing a broad band frequency characteristics, when high fidelity recorded video tape is reproduced. SOLUTION: In the video-integrated television receiver where a video device is contained in a cabinet of the television receiver, when a normally recorded video tape is reproduced, a low pass filter is activated so as not to amplify high-frequency signals which are not recorded on the video tape and the low- pass filter is deactivated, when a high fidelity recorded video tape is reproduced, so as to amplify an audio signal from low frequency to high frequency recorded on the video tape.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video-integrated type television device in which a high-fidelity video device is housed in a cabinet of the television device, and in particular, noise of high frequency band when reproducing a video tape on which an audio signal is normally recorded. Regarding the reduction of.

[0002]

2. Description of the Related Art A conventional technique is disclosed, for example, in Japanese Patent Laid-Open No. 6-13.
As described in Japanese Laid-Open Patent Publication No. 923, in an audio reproducing device for reproducing audio signals of various sources, the audio signal is detected for each of a plurality of different frequency bands, and the detected signals in the respective bands are compared with each other. There is a device in which the output frequency characteristic of the audio signal corresponding to the determined content of the source is switched to.

[0003]

However, in the above-mentioned conventional technique, the audio signals of various sources are detected for each of a plurality of different frequency bands, and the detected signals of each band are compared to determine the content of the source. Then, it was possible to switch to the output frequency characteristics of the audio signal corresponding to the content of the determined source, but if the signal level of the high frequency noise is high, the high frequency noise is also determined to be the content of the source. However, it is difficult to switch to the output frequency characteristic that does not include the noise in the high frequency range.

Therefore, when an audio signal of a video tape recorded by normal recording having a narrower frequency band than that of high-fidelity recording is amplified by an audio amplifier circuit having a wide band frequency characteristic, it is not recorded as an audio signal on the video tape. There is an inconvenience that the high frequency noise is amplified together with the audio signal and output from the speaker, and the high frequency noise becomes annoying.

As is well known, in the case of high-fidelity recording, the audio signal recorded on the video tape is on the same video track as the video signal, with the azimuth opposite to the video signal, to the deep magnetic layer of the video tape. Recording is performed by the deep layer recording method, and as shown in FIG.
It is recorded with a wide band frequency characteristic up to 0 kHz.
Further, in the case of normal recording, the audio signal recorded on the video tape is recorded on the audio track at the end of the video tape, and as shown in FIG. 3B, the bandwidth of the frequency is higher than that of the audio signal recorded by hi-fi. Is narrow, from 100Hz to 1
It is recorded with a narrow band frequency characteristic up to 0 kHz.

In a video-integrated television device corresponding to a video tape recorded by high-fidelity recording, when an audio signal of the video tape recorded in such normal recording is reproduced, an audio signal amplifier circuit of the video-integrated television device. Has a wide-band frequency characteristic, so high-frequency noise peculiar to the television not recorded on the video tape, especially 15.75 kHz of the horizontal deflection synchronization signal of the television.
The leak signal is amplified by the audio signal amplifier circuit, and is output from the speaker together with the reproduced audio signal, and noise in the high frequency range is heard from the speaker and becomes annoying.

The present invention has been made in view of the above points, and when reproducing a video tape on which an audio signal is normally recorded, the high frequency is cut off and the high frequency not recorded on the video tape is cut off. Signal is not amplified so that noisy high frequency noise can be prevented from being output from the speaker, and the broadband frequency characteristic is impaired when playing a video tape on which an audio signal is high fidelity recorded. Instead, it seeks to be able to reproduce the audio signal recorded in hi-fi.

[0008]

In order to achieve the above object, according to the present invention, in a video-integrated type television device in which a video device is housed in a cabinet of a television device, a high frequency band which cuts off a high frequency band of an audio signal. Blocking means,
And a selector for selecting ON / OFF of the high frequency cutoff means, and when reproducing a video tape on which an audio signal is normally recorded, the high frequency cutoff means is turned on and recorded on the video tape. When reproducing a video tape in which an audio signal is high fidelity recorded so as not to amplify a signal of a high frequency which is not present, the high frequency cut-off means is turned off so that the high frequency from the low frequency recorded on the video tape is increased. Amplify audio signals up to frequency.

By these means, when a video tape on which an audio signal is normally recorded is reproduced, the high frequency is cut off so that the high frequency signal not recorded on the video tape is not amplified, which is unpleasant to the ear. It is possible to prevent the high frequency noise from being output from the speaker and to reproduce the high fidelity recorded audio signal without damaging the wide band frequency characteristic when reproducing the video tape in which the high fidelity audio signal is recorded.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below in detail with reference to the drawings as appropriate. 1 is a block diagram showing a configuration of a video-integrated television apparatus according to an embodiment of the present invention, and FIG. 2 is a flowchart showing an operation of the video-integrated television apparatus according to an embodiment of the present invention.

First, a description will be given based on the block diagram showing the configuration of the video-integrated television apparatus according to the embodiment of the present invention in FIG.

The hi-fi recorded audio signal recorded on the video track 1a of the video tape 1 by the deep recording method is read by the rotary magnetic head 2a and recorded on the audio track 1b as a normally recorded audio signal. Are read by the magnetic head 2b.

Rotating magnetic head 2a or magnetic head 2b
The audio signal read out from the video tape by the high-fidelity head amplifier 3 has a very low signal level.
And is amplified to a signal of a predetermined level.

The hi-fi head amplifier 3 is a microcomputer 8
By the control signal from, the hi-fi recorded audio signal read by the rotary magnetic head 2a and the normally recorded audio signal read by the magnetic head 2b are selected and amplified. When the reproduction of the normally recorded audio signal is not selected, the hi-fi head amplifier 3 amplifies the hi-fi recorded audio signal read by the rotary magnetic head 2a, and the reproduction of the normally recorded audio signal is selected. The magnetic head 2b
Amplify the normally recorded audio signal read by.

The audio signal amplified by the high-fidelity head amplifier 3 is sent to the low-pass filter 4, and the ON / OFF of the low-pass filter 4 controls the cut-off and passage of the high-frequency. The low-pass filter 4 is composed of a resistor and a capacitor, and when the control signal from the microcomputer 8 is at a high level, the transistor 7 becomes conductive and passes an audio signal with a frequency of 10 kHz or less.
Blocks audio signals with frequencies above 0 kHz. Also,
When the control signal from the microcomputer 8 is at a low level, the low pass filter 4 turns off the transistor 7 and passes the audio signal of low to high frequencies.

The audio signal that has passed through the low-pass filter 4 is amplified by the audio signal amplifier circuit 5, and the amplified audio signal is output from the speaker 6.

The remote control device 10 has a reproduction key for instructing reproduction of a video tape and a normal selection key for instructing reproduction of a normally recorded audio signal (neither is shown).
Various operation keys for operating the video-integrated television device as desired are provided, and when the operation key of the remote control device 10 is pressed, the remote control signal of the command signal corresponding to the pressed operation key is transmitted to the remote control device 10. Transmitted as an infrared signal. The remote control signal of the infrared signal transmitted from the remote control device 10 is received by the remote control receiving unit 9, converted into a predetermined electric signal, and sent to the microcomputer 8.

When the microcomputer 8 receives the remote control signal of the normal selection key transmitted from the remote control device 10,
A control signal for amplifying the audio signal read by the magnetic head 2b is sent to the hi-fi head amplifier 3 so as to amplify the normally-recorded audio signal, and the transistor 7 is turned on to be amplified by the hi-fi head amplifier 3. A low-pass filter 4 cuts off an audio signal having a high frequency exceeding 10 kHz. When the low-pass filter 4 is ON, the 15.75 kHz leak signal of the horizontal deflection synchronizing signal of the television is blocked and is not amplified by the audio signal amplifying circuit 5, so that a high-frequency signal not recorded on the video tape is generated. The noise of high frequency that is not amplified and is offensive to the ear is not output from the speaker 6.

Further, the microcomputer 8 controls the hi-fi head amplifier 3 to amplify the audio signal read by the magnetic head 2a when the remote control signal of the normal selection key for selecting the reproduction of the normally recorded audio signal is not received. A signal is sent to amplify the high-fidelity recorded audio signal, the transistor 7 is turned off, and the low-frequency to high-frequency audio signal amplified by the high-fidelity head amplifier 3 is passed. When the low-pass filter 4 is off, the hi-fi recorded audio signal recorded on the video tape is sent to the audio signal amplification circuit 5 and amplified, and the hi-fi recorded audio from low frequency to high frequency is recorded. The signal is output from the speaker 6.

Next, the operation of the video-integrated television apparatus according to the embodiment of the present invention shown in FIG. 2 will be described based on a flowchart.

When the reproduction of the video tape is started, the process proceeds from step S1 to step S2, it is judged whether or not the normal selection key for selecting the reproduction of the audio signal recorded by the normal recording is pressed, and the normal selection key is pressed. If yes, the process proceeds to step S3. If the normal selection key is not pressed, the process proceeds to step S5.

In step S3, the transistor is turned on, the high-pass frequency of the audio signal is cut off by the low-pass filter, the signal not recorded on the video tape is not amplified, and the process proceeds to step S4.

In step S4, the hi-fi head amplifier is controlled so as to amplify the normally recorded audio signal recorded in the audio track of the video tape, the video tape is reproduced, and the process proceeds to step S7 to end the processing. To do.

In step S5, the transistor is turned off to release the cutoff of the high frequency band by the low pass filter so that the audio signal from the low frequency band to the high frequency band recorded on the video tape is amplified. Then, the process proceeds to step S6.

In step S6, the hi-fi head amplifier is controlled so as to amplify the hi-fi recorded audio signal recorded on the video track of the video tape, the video tape is reproduced, and the process proceeds to step S7 to end the process. To do.

[0026]

As described above, according to the video-integrated television device of the present invention, when a video tape in which an audio signal is normally recorded is played back, the high frequency band of the audio signal is cut off, and the video signal is cut off. Do not amplify the high frequency signals that are not recorded on the tape, and release the high frequency cutoff of the audio signals when you play back the video tape where the audio signals are high fidelity recorded and recorded on the video tape. It is possible to amplify an audio signal from low frequency to high frequency. As a result, when playing back a video tape on which an audio signal is normally recorded, the high frequency is cut off so that the high frequency signal not recorded on the video tape is not amplified. It is possible to prevent noise from being output from the speaker, and when playing back a videotape on which an audio signal is recorded in hi-fi, it is possible to reproduce the audio signal recorded in hi-fi without damaging the frequency characteristics of a wide band.

In the video-integrated television set according to the first aspect of the present invention, when the video tape in which the audio signal is normally recorded is reproduced, the high frequency cutoff means is turned on,
When reproducing a video tape in which the audio signal is high fidelity recorded, the high frequency cutoff means is turned off so as not to amplify the high frequency signal not recorded on the video tape.
When it is set to F, the audio signal recorded on the video tape from low frequency to high frequency is amplified.

In the video-integrated television set according to the second aspect of the present invention, when the video tape on which the audio signal is normally recorded is reproduced, the high frequency cutoff means is turned on,
High frequency signals not recorded on the video tape are not amplified.

In the video-integrated television set according to the third aspect of the present invention, when the video tape in which the audio signal is high fidelity recorded is reproduced, the high frequency cutoff means is turned off and the low frequency recorded on the video tape is reduced. It is designed to amplify audio signals in the range frequency to the high range frequency.

In the video-integrated television set according to the fourth aspect of the present invention, the high frequency band is cut off by the low pass filter circuit which blocks the frequency of the horizontal deflection synchronizing signal of the television set.

According to a fifth aspect of the present invention, there is provided a video-integrated television set which constitutes a low-pass filter circuit composed of a resistor and a capacitor.

In the video-integrated television set according to the sixth aspect of the present invention, the high frequency band is cut off by pressing the operation key provided on the remote control device or the operation panel.

According to the seventh aspect of the present invention, the video-integrated television set turns off the high frequency cutoff means when the operation key for selecting the high frequency cutoff means provided on the remote control device or the operation panel is not operated. I am trying to do it.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a video-integrated television device according to an embodiment of the present invention.

FIG. 2 is a flowchart showing an operation of the video-integrated television device according to the embodiment of the present invention.

FIG. 3 is an explanatory diagram showing frequency characteristics of an audio signal recorded on a video tape.

[Explanation of symbols] 1 video tape 1a Video track 1b audio track 2a rotating magnetic head 2b magnetic head 3 Hi-fi head amplifier 4 Low pass filter 5 Audio signal amplification circuit 6 speakers 7 transistors 8 microcomputer 9 Remote control receiver 10 Remote control device

Claims (7)

[Claims] 1. A video-integrated type television device in which a video device is housed in a cabinet of a television device, wherein a high frequency cutoff means for cutting off a high frequency of an audio signal and an ON / OFF switch of the high frequency cutoff means. Selecting means for selecting, when reproducing a video tape in which an audio signal is normally recorded, the high frequency blocking means is turned on so as not to amplify a high frequency signal not recorded on the video tape. When reproducing a video tape in which an audio signal is high-fidelity recorded, the high frequency cutoff means is turned off so that the audio signal from the low frequency to the high frequency recorded on the video tape is amplified. A video-integrated television device characterized in that 2. A video-integrated type television device in which a video device is housed in a cabinet of a television device, wherein a high frequency cutoff means for shutting off a high frequency of an audio signal and an ON / OFF of the high frequency cutoff means. Selecting means for selecting, and when reproducing a video tape in which an audio signal is normally recorded, the high frequency cutoff means is turned on so that a high frequency signal not recorded on the video tape is not amplified. A video-integrated television device characterized by the above. 3. When reproducing a video tape in which an audio signal is high fidelity recorded, the high frequency cutoff means is OF
3. The video-integrated television device according to claim 2, wherein the audio signal from low frequency to high frequency recorded on the video tape is amplified to F. 4. The video according to claim 1, wherein the high-frequency cutoff unit is a low-pass filter circuit that cuts off a frequency of a horizontal deflection synchronizing signal of a television. Integrated TV device. 5. The video-integrated television apparatus according to claim 4, wherein the low-pass filter circuit is a low-pass filter circuit composed of a resistor and a capacitor. 6. The video integrated type according to claim 1, wherein the selection means is an operation key provided on a remote control device or an operation panel of the video integrated television device. TV equipment. 7. The high frequency cutoff unit is set to OFF when the selection unit provided on the remote controller or the operation panel is not operated. The video-integrated television device described.