JP2554009Y2 - 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 magnetic recording / reproducing apparatus, and more particularly to a camera-integrated video tape recorder having an input / output terminal (hereinafter referred to as "camera-integrated VT").
R ". ).

[0002]

2. Description of the Related Art A technique disclosed in Japanese Utility Model Laid-Open No. 132608/1985 has been proposed as a camera-integrated VTR of this type. The VTR includes input / output terminals for video signals and audio signals, a changeover switch for switching between input and output signal lines of the video and audio signals, and first and second interlocking switches. An interlocking switch is provided, and by switching the changeover switch, the first and second interlocking switches are switched, so that each terminal can also be used as an input and output terminal.

By operating a camera / line switch provided in the camera-integrated VTR, a video signal and an audio signal from the camera-integrated VTR can be output to an external device in the camera mode.
Conversely, in the line mode, a video signal and an audio signal from an external device can be input.

However, such a camera-integrated V
Since the TR does not have a function of mixing an audio signal from an external device, when a user reproduces a recorded video signal and an audio signal, the user hears only monotonous audio information recorded from a microphone. It made the viewing of the user boring.

[0005]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned drawbacks, and provides a switch for mixing an audio signal from a microphone and an audio signal from an external device in conjunction with an input / output switch. Thus, the audio signal from the microphone and the audio signal from the external device can be mixed with a simple configuration.

[0006]

According to the present invention, there is provided a microphone unit for picking up external sound, a recording unit for recording an audio signal picked up by the microphone unit, and an audio signal from an external device. Alternatively, in a recording / reproducing apparatus having an input / output terminal for outputting an audio signal from the microphone unit to an external device and an input / output switch for switching the function of the input / output terminal, the audio signal from the microphone unit is attenuated. Attenuating means, and a sound from the attenuating means which is provided between the microphone unit and the recording unit and which is input in response to switching of the input / output switch which receives the function of the input / output terminal as an input. It is an object of the present invention to propose a recording / reproducing apparatus provided with mixing means for mixing a signal and an audio signal from an external device input from the input / output terminal.

Further, the present invention provides a camera unit for capturing an image of a subject, a microphone unit for collecting external sound, and an audio signal collected by the microphone unit and a video signal captured by the camera unit. A recording unit, an input / output terminal for inputting an audio signal and a video signal from an external device, or outputting an audio signal from a microphone unit and a video signal from a camera unit to the external device, and a function of the input / output terminal A recording / reproducing apparatus having an input / output changeover switch for switching between the microphone unit and the recording unit, wherein the attenuating unit attenuates an audio signal from the microphone unit, and the input / output terminal is provided between the microphone unit and the recording unit. A sound signal from the attenuating means input in response to switching of the input / output switch having a function as an input, and a sound from an external device input from the input / output terminal It proposes a recording and reproducing apparatus provided with a mixing means for mixing the signal.

Another object of the present invention is to provide a recording / reproducing apparatus having a prohibiting means for prohibiting the input of the audio signal from the attenuating means when the power is turned on, in the mixing means.

[0009]

Since the present invention is configured as described above, by setting the output from the input / output switch to a high level during audio mixing, the audio signal from the microphone is attenuated and the audio signal from the external device is input. Receiving
These sounds are mixed and derived to a recording circuit. When audio mixing is not required, the output from the input / output changeover switch is set to low level to inhibit the input of the audio signal from the external device, and the audio signal from the microphone is guided to the recording circuit without attenuating.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

FIG. 1 is a block diagram showing the recording / reproducing apparatus of the present invention, which is roughly divided into an audio block section and a video block section.

The audio block unit includes a microphone 1 for collecting external audio, a first attenuator 2 for attenuating an audio signal collected from the microphone 1, and an external device (FIG. 1) connected to the terminals 3 and 4. An input / output switch 5 for switching input / output lines of video signals and audio signals from an external device or an external device, and a first attenuator for controlling an audio signal from the microphone 1 by a control signal from the input / output switch 5. A first switch 6 for switching whether or not via a terminal 2;
The second switch 8 is controlled by a CPU (not shown) connected to the second switch 8 and is turned on in the camera mode (turned off in the line mode). 3 switch 9 and second attenuator 1 for attenuating an audio signal from an external device
0, an adder 11 for mixing an audio signal from the microphone 1 via the first switch 6 with an audio signal from an external device via the second attenuator 10, and a control signal from the CPU. And a fourth switch 12.

The audio block constructed as described above is connected to an audio recording circuit via a terminal 13.

The video block comprises a camera 14 for capturing an image of a subject, a fifth switch 15 switched by a control signal from the CPU, and a sixth switch 16 controlled by the input / output switch 5. ing.

The video block constructed as described above is connected to a video recording circuit via a terminal 17.

Next, the operation will be described. In the case of mixing during camera recording, the input / output changeover switch 5 is switched to the “a” side so that the + B power supply is switched to the first switch 6, the third switch 9, and the sixth switch 16.
And these switches are switched to the b side. At this time, when the camera-integrated VTR selects the camera mode, a control signal corresponding to the camera mode is output from the CPU, and the control signal turns on the second switch 8 and the fourth switch 12 and the fourth switch 12. 5
The switch 15 is switched to the a side.

Therefore, the external audio signal from the microphone 1 is
The signal is applied to the adder 11 via the first attenuator 2, the first switch 6, and the second switch 8. An audio signal input from the external device via the terminal 3 is transmitted to the third switch 9 and the second switch 9.
The signal is applied to the adder 11 via the attenuator 10. Then, after these audio signals are mixed by the adder 11,
The signal is led to a voice recording circuit (not shown) of the VTR via the fourth switch 12 and the terminal 13. Further, the video signal from the camera 14 passes through the fifth switch 15 and
It is led to a video recording circuit (not shown) of the TR.

On the other hand, when mixing is not required during camera recording, the input / output switch 5 is switched to the b side to supply + B power to the first switch 6, the third switch 9, and the sixth switch 16. Is stopped,
These switches are switched to the a side. Also, as described above, since the camera-integrated VTR is selected in the camera mode, the second switch 8 is turned on by a control signal from the CPU, and the fourth switch 12 and the fifth switch 15 are also a Hold the state of the side.

Therefore, the external audio signal from the microphone 1 is guided to the audio recording circuit of the camera-integrated VTR via the first switch 6, the second switch 8, and the fourth switch 12 without being attenuated. The video signal from the camera 14 is guided to the video recording circuit of the camera-integrated VTR from the terminal 17 via the fifth switch 15 as in the case of mixing.

Further, when recording an audio signal and a video signal from an external device (line mode), the first switch 6, the third switch 9, and the sixth switch 16 are switched by switching the input / output switch 5 to the b side. Is switched to the b side. When the camera-integrated VTR is selected for the line mode, a control signal corresponding to the line mode is output from the CPU, and the control signal turns off the second switch 8 and the fourth switch 12 and the fifth switch 15. Is switched to the b side.

Therefore, the audio signal from the external device is supplied to the terminal 3, the third switch 9, the fourth switch 12, and the terminal 13
To the audio recording circuit of the camera-integrated VTR,
The video signal from the external device is supplied to the terminal 4, the sixth switch 16,
The signal is led to the video recording circuit of the camera-integrated VTR via the fifth switch 15 and the terminal 17.

Next, FIG. 2 shows a specific circuit configuration of the audio block section of FIG. In FIG. 2, when mixing at the time of camera recording, the camera-integrated VTR is selected in the camera mode. Therefore, a high-level signal is applied to the terminal 7, and therefore, the transistor 18 and the transistor 19 are turned on, the power supply voltage is applied to the 13th pin of the microphone amplifier IC 20, and the microphone amplifier IC 20 It is in the operating state. The high-level signal from the terminal 7 is also supplied to the third switch 9,
The seventh switch 21 constituting the third switch 9 is turned on and the eighth switch 22 is turned off.

Here, by switching the input / output switch 5 to the a side, the transistor 23 is turned on and the fourth switch 12 is switched to the a side. Therefore, the external audio signal picked up by the microphone 1 is input to the 18th pin of the microphone amplifier IC 20 and amplified,
It is output from the 15th pin. This microphone audio signal is attenuated by the first attenuator 2 composed of the resistors 24 and 25, and is input via the buffer amplifier 26 to the resistor 27 forming the adder 11. On the other hand, an audio signal from an external device is input from a terminal 3 via a seventh switch 21 to a resistor 28 that performs the functions of attenuation and addition. After these audio signals are mixed at the connection point A, the audio FM I
The signal is input to the 38th pin of C29, and is led out to the audio recording circuit via the fourth switch 12.

If mixing is not required during microphone recording, the input / output switch 5 is switched to the b side to turn off the transistor 23 and switch the fourth switch 12 to the b side. Therefore, the audio signal from the microphone 1 is input to the 38th pin of the audio FM IC 29 without being mixed with the audio signal from the external device, and is guided to the audio recording circuit via the fourth switch 12. Here, by selecting the resistors 30 and 31 to have high impedance, the audio signal from the microphone 1 is not attenuated.

When recording an audio signal from an external device, the camera-integrated VTR is selected in the line mode. Accordingly, since a low-level signal is applied to the terminal 7, the transistors 18 and 19 are turned off, the power supply voltage is not applied to the 13th pin of the microphone amplifier IC 20, and the microphone amplifier IC 20 is in a non-operation state. Become. The low-level signal from the terminal 7 is also supplied to the third switch 9 to turn off the seventh switch and turn on the eighth switch.

Here, by switching the input / output switch 5 to the b side, the transistor 23 is turned off and the fourth switch 12 is switched to the b side. For this reason, the audio signal from the external device is input to the 36th pin of the audio FM IC 29 via the terminal 3 and the eighth switch 22, and is guided to the audio recording circuit via the fourth switch 12.

FIG. 3 shows a second embodiment of the recording / reproducing apparatus of the present invention. The present embodiment is characterized in that input of a video signal from an external device by the input / output switch 5 is prohibited.

The present embodiment is different from FIG. 1 in that the fourth switch 12, the fifth switch 15, and the sixth switch 16 are fixed to the side a, the signal from the input / output switch 5, And an AND circuit 32 to which a recording / reproduction determination signal from the CPU is input.
Is to switch the third switch 9 according to the output.

With this configuration, during recording, a high-level signal is supplied from the CPU from the terminal 33, and the input / output switch 5 is switched to the a side. For this reason, the first switch 6 and the third switch 9 are switched to the b side, and the audio signal from the microphone 1 and the audio signal from the external device can be mixed with a simple configuration.

FIG. 4 shows a third embodiment of the recording / reproducing apparatus of the present invention. This embodiment is also similar to FIG. 1, but differs from FIG. 1 in that a D-flip-flop 36 in which a signal from the input / output switching circuit 5 is used as a clock and a differentiating circuit including a resistor 34 and a capacitor 35 is connected to a reset terminal.
(Hereinafter abbreviated as “D-FF”), and an AND circuit 37 that receives the Q output signal of the D-FF 36 and the signal from the input / output switch 5 as inputs. The point is that the first switch 6 is controlled.

With this configuration, the D-FF 36 is reset by the differentiating circuit when the power is turned on, regardless of the state of the input / output switch 5. Therefore, when the power is turned on, the Q output of the D-FF 36 is at a low level, a low-level signal is output from the AND circuit 37, and the first switch 6 always switches to the a side. Here, by switching the input / output switch 5 to the a side again, a high-level signal is output from the D-FF 36, and the output from the AND circuit 37 is inverted to the high level in synchronization with this signal, and the first switch 6 is turned on. Is switched to the b side.

As described above, in this embodiment, the first switch 6 always switches to the "a" side when the power is turned on, so that there is no problem that the audio signal from the microphone is attenuated by the carelessness of the user.

[0033]

According to the recording / reproducing apparatus of the present invention, the first switch 6 and the third switch 6
Since the switch 9 is switched, the audio signal from the microphone and the audio signal from the external device can be mixed with a simple configuration.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a specific circuit diagram of an audio block unit in FIG.

FIG. 3 is another embodiment of the present invention.

FIG. 4 is another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Microphone 2 1st attenuator 5 I / O changeover switch 6 1st switch 8 2nd switch 9 3rd switch 10 2nd attenuator 11 Adder 12 4th switch 14 Camera 15 5th switch 16 6th switch

Claims (3)

(57) [Scope of request for utility model registration] 1. A microphone unit for picking up an external sound, a recording unit for recording an audio signal picked up by the microphone unit, and an audio signal from an external device, or a signal from the microphone unit to an external device. An input / output terminal for outputting an audio signal, and an input / output switch for switching the function of the input / output terminal, an attenuating means for attenuating an audio signal from the microphone unit; An audio signal from the attenuating means, provided between the input / output switch and the input / output switch, which is provided between the input / output terminal and the input / output terminal. And a mixing means for mixing an audio signal from an external device input from an external device. 2. A camera unit for capturing an image of a subject, a microphone unit for collecting external audio, a recording unit for recording an audio signal collected by the microphone unit and a video signal captured by the camera unit, An input / output terminal for inputting an audio signal and a video signal from an external device, or outputting an audio signal from a microphone unit and a video signal from a camera unit to the external device, and switching a function of the input / output terminal. In a recording / reproducing apparatus having an input / output changeover switch, an attenuating unit for attenuating an audio signal from the microphone unit, provided between the microphone unit and the recording unit, and having the function of the input / output terminal as an input. The audio signal from the attenuating means input in response to the switching of the input / output switch and the audio signal from an external device input from the input / output terminal are mixed. A recording / reproducing apparatus, comprising: 3. The recording / reproducing apparatus according to claim 1, wherein said mixing means has a prohibition means for prohibiting an input of an audio signal from said attenuation means when power is turned on.