JP2000324373A - Method and system for voice signal input output changeover and video camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a voice signal input output changeover method by which the operability is enhanced without the need for trouble of input selection and without causing misunderstanding to a user and to obtain a system therefor and a video camera. SOLUTION: The video camera A is provided with a line input output common use terminal 22 receiving a 1st voice signal from a voice signal input output common use terminal, a built-in microphone 34 that receives a 2nd voice signal, an external microphone input terminal 33 that receives a 3rd voice signal, and a line input output common use terminal changeover switch 21 that automatically switches the voice signal input output changeover of the line input output common use terminal 22 depending on a connection state of the voice input output common use terminal and a connection state of the external microphone input terminal 33 and the built-in microphone 34.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for inputting / outputting a sound signal applicable to a video camera apparatus capable of dubbing from three systems of a line input / output terminal, a built-in microphone, and an external microphone input terminal, and a video camera apparatus. About.

[0002]

2. Description of the Related Art Conventionally, in a video camera apparatus capable of dubbing from three systems of a line input / output terminal, a built-in microphone, and an external microphone input terminal, when an input source is switched, an external microphone input terminal and a line input / output terminal are used. The input source is selected based on the detection result of whether or not the plug is inserted into the device.

[0003]

However, the above-mentioned prior art has the following problems.

When input switching of three systems is performed based on the detection result of whether or not plugs are inserted into the external microphone input terminal and the line input / output terminal, when the plug of the external microphone input terminal is inserted, The switching of the line input / output terminal can be uniquely determined as the line output terminal (when the external microphone input terminal plug is inserted, the line input / output terminal is switched to the line output terminal and functions as a monitor output), If only the line input / output terminal is plugged in, the user may want to use the audio dubbed from the built-in microphone as the monitor output using the line input / output terminal as the line output terminal, or simply use the line input / output terminal. You can determine whether you want to use it as a line input terminal. No. Therefore, in the conventional configuration, the dubbing input source is divided into a microphone input system and a line input system, and the user manually performs a switching operation on a menu screen or the like.

However, in such a method, not only does the user have trouble in selecting the after-recording input source, but if the user is not provided with a display that appropriately tells the user what input source is being selected, the user may misunderstand. (For example, when the input to the line input is a microphone input, etc.), there is a possibility that a misunderstanding that recording is not performed although a signal is input may be caused.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and has as its object to eliminate troublesome input selection and to cause misunderstanding to the user. It is an object of the present invention to provide a sound signal input / output switching method and apparatus and a video camera apparatus which have improved operability.

[0007]

According to a first aspect of the present invention, there is provided a sound signal input / output switching method for inputting a first sound signal from a sound signal input / output terminal. An input step, a second sound signal inputting step of inputting a second sound signal, a third sound signal inputting step of inputting a third sound signal, and a sound signal inputting step of the first sound signal inputting step. A sound signal input / output switching method comprising: automatically switching output switching depending on the connection status of the sound input / output terminal and the connection status of the second and third sound signal input processes.

Further, in order to achieve the above object, a second aspect is provided.
The sound signal input / output switching method according to claim 1, wherein the first sound signal inputting step is performed by a line input / output terminal, and the second sound signal inputting step is built-in. The third sound signal inputting step is performed by an external microphone input terminal.

[0009] In order to achieve the above object, a third aspect is provided.
According to the sound signal input / output switching method described in the first aspect, the sound signal input / output switching method is characterized in that the mode is a sound post-recording mode.

[0010] Further, in order to achieve the above object, a fourth aspect is provided.
The described sound signal input / output switching device comprises a first sound signal input means for inputting a first sound signal from a sound signal input / output terminal, and a second sound signal input means for inputting a second sound signal. And third sound signal input means for inputting a third sound signal;
Switching means for automatically switching sound signal input / output switching of the first sound signal input means according to the connection status of the sound input / output terminal and the connection status of the second and third sound signal input steps. It is characterized by.

[0011] In order to achieve the above object, the present invention provides a fifth aspect.
5. The sound signal input / output switching device according to claim 4, wherein the first sound signal input means is a line input / output terminal, and the second sound signal input means is built-in. A microphone, and the third sound signal input means is an external microphone input terminal.

[0012] In order to achieve the above object, the present invention provides a semiconductor device comprising:
A sound signal input / output switching device according to a fourth aspect of the present invention is the sound signal input / output switching device according to the fourth aspect, wherein the mode is a sound post-recording mode.

[0013] In order to achieve the above object, a seventh aspect of the present invention is provided.
The video camera device described above includes a first sound signal input unit that inputs a first sound signal from a sound signal input / output terminal, a second sound signal input unit that inputs a second sound signal, Third sound signal input means for inputting the third sound signal, and switching of the sound signal input / output of the first sound signal input means with the connection status of the sound input / output terminal and the second and third sound signals. Switching means for automatically switching according to the connection status of the input step.

According to another aspect of the present invention, there is provided a computer system comprising:
8. The video camera device according to claim 7, wherein the first sound signal input means is a line input / output terminal, the second sound signal input means is a built-in microphone, The sound signal input means of No. 3 is an external microphone input terminal.

According to another aspect of the present invention, there is provided a computer system comprising:
The video camera device according to claim 7, wherein the mode is an audio post-recording mode.

Further, in order to achieve the above object, a first aspect is provided.
0, the video camera device has a line input / output terminal,
In a video camera device having a built-in microphone and an external microphone input terminal and capable of post-recording from the three input sources, a line input / output terminal plug detecting means for detecting that a plug has been inserted into the line input / output terminal; A line input / output terminal switching means for switching the line input / output terminal to three modes of line input, line output, and load detection signal output, and a load for outputting a signal for detecting a load of another connected device. Detection signal output means, load detection means for detecting a load at the connection destination based on the level of the load detection signal, detection results of the load detection means, detection results of the line input / output terminal plug detection means, and the video camera device Line input / output that controls the line input / output terminal switching means according to the operation mode of A shared terminal switching control means, and having an external line microphone input terminal plug detection means for detecting that the plug to the external microphone input terminal is inserted.

[0017]

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 a configuration of a video camera device according to one embodiment of the present invention. FIG. 2 is a line including a load detection unit in the video camera device according to one embodiment of the present invention. FIG. 3 is a block diagram illustrating a configuration of an input / output terminal and a switching control unit of each unit.

In FIG. 1, reference numeral 1 denotes a lens for capturing an optical image, 2 denotes a CCD for converting the optical image into an electric signal, 3 denotes a camera signal processing circuit for processing an electric signal from the CCD unit 2, and 4 denotes the entire video camera device. 5 is an operation key for inputting a desired operation of the video camera device, 6 is a microphone (microphone) for collecting sound, and 7 is a microphone amplifier (microphone amplifier) for amplifying an audio signal collected by the microphone 6. ), 8
Is an audio signal processing circuit for processing audio signals, 9 is an audio signal processing circuit for processing video signals, 10 is a display panel for displaying video signals or operation modes, operation menus, etc., 11 is a headphone amplifier for driving headphones, 12 Denotes a speaker driver for driving a built-in speaker of the apparatus main body, 13 denotes a line input / output unit for inputting / outputting a video signal / audio signal, 14 denotes a recording current which flows through a head 15 described later, and is recorded on a recording medium such as a magnetic tape. A head amplifier that amplifies the reproduced signal during reproduction, 15 is a head that records on the recording medium or reproduces a recorded signal on the recording medium, 16 is a headphone jack that inserts a headphone plug into the apparatus main body, and 17 is a speaker that emits sound It is.

FIG. 2 is a block diagram showing a configuration of a line input / output terminal provided with a load detection unit and a switching control unit of each unit in the video camera apparatus according to the present embodiment. In the figure, A is a video camera device, and B is another audio device.

The video camera apparatus A includes a line output amplifier 18, a line input amplifier 19, a recording system input changeover switch 20, a line input / output terminal changeover switch 2
1. Line input / output terminal (first sound signal input means) 2
2. Oscillator 23, oscillator output switch 24, oscillator output impedance 25, load detection signal amplifier 26, load detection signal detector (DET) 27, reference voltage unit (REF) 2.
8, plug detector (PIN DET) 29, comparator (C
OMP) 30, microcomputer (microcomputer) 3
1. External microphone detector (EXT-MIC DET) 3
2. External microphone input terminal (third sound signal input means)
3, a built-in microphone (second sound signal input means) 34, a microphone amplifier input switch 35, and a microphone amplifier 36.

The line output amplifier 18 amplifies and outputs an audio signal. The line input amplifier 19 amplifies the audio signal input through the line. The recording system input changeover switch 20 selects an audio signal from a line input system or a microphone input system and inputs it to the recording system. The line input / output terminal switch 21 switches input / output of the line input / output terminal 22 and a load detection signal for detecting the impedance of the connection destination. The line input / output terminal 22 inputs or outputs an audio signal and outputs a load detection signal.
The oscillator 23 generates a load detection signal. The oscillator output switch 24 turns on / off the oscillator output. The oscillator output impedance 25 defines the output impedance of the oscillator 23. The load detection signal amplifier 26 amplifies the load detection signal. Load detection signal detector (DET) 27
Converts the load detection signal amplified by the load detection signal amplifier 26 into a DC voltage. Reference voltage section (REF) 28
Is a reference for comparing the output of the load detection signal detector (DET) 27. The plug detection unit (PIN DET) 29 detects whether or not a plug is connected to the line input / output terminal 22. The comparator (COMP) 30 includes an output of the load detection signal detector (DET) 27 and a reference voltage unit (REF).
28 with the reference voltage. The microcomputer 31 controls each unit according to the detection result. External microphone detector (EX
T-MICCDET) 32 detects whether or not a plug is inserted into the external microphone input terminal 33. The external microphone input terminal 33 inputs an external microphone plug. The built-in microphone 34 is built in the apparatus main body and collects sound. The microphone amplifier input switch 35 switches an audio signal from the built-in microphone 34 or the external microphone input terminal 33 and inputs the signal to the microphone amplifier 36. The microphone amplifier 36 amplifies the audio signal from the built-in microphone 34.

The other audio equipment B has a line input terminal 37, a line input amplifier 38, a line output terminal 39, and a line output amplifier 40.

The line input terminal 37 is a terminal to which an audio signal output from the line input / output terminal 22 of the video camera device A is input. The line input amplifier 38 amplifies the audio signal input from the line input terminal 37. The line output terminal 39 is a terminal that outputs an audio signal input to the line input / output terminal 22 of the video camera device A. The line output amplifier 40 amplifies the audio signal output from the line output terminal 39.

Next, the operation of each block shown in FIG. 2 will be described.

When the power of the video camera apparatus A is turned on, the line input / output terminal switch 21 is controlled by a control signal from the microcomputer 31 regardless of the mode.
Is connected to the fixed contact a, the movable contact of the recording system input changeover switch 20 is connected to the fixed contact e, the oscillator output switch 24 is opened, and the movable contact of the microphone amplifier input changeover switch 35 is connected to the fixed contact g. Have been. The normal calora mode recording or VTR (video tape recorder) mode reproduction operation is performed in this state.

Here, when a plug is connected to the external microphone input terminal 33, the plug is connected to the external microphone detection unit (EX).
T-MIC DET) 32 and the microcomputer 31
Switches the microphone amplifier input changeover switch 35 to a state where its movable contact is connected to the fixed contact f. Thus, the audio signal from the external microphone input terminal 33 is input to the microphone amplifier 36.

Next, when the user performs an operation for selecting the line input mode when performing a normal line input in the VTR mode, the microcomputer 31 causes the line input / output terminal changeover switch 21 to switch its movable contact. Is the fixed contact b
When the recording system input changeover switch 20 is
Is switched to a state in which the movable contact is connected to the fixed contact d. As a result, the line input / output terminal 22
Is input to the recording system.

Next, a post-recording operation in the VTR mode will be described.

When the user sets the post-recording mode,
When a plug is inserted into the external microphone input terminal 33 and the external microphone detection unit (EXT-MIC DET) 32 detects the plug, the microcomputer 31 sets the recording system input switch 20 regardless of other detection results such as plug detection. When the movable contact is connected to the fixed contact e, the microphone amplifier input switch 35 is connected. When the movable contact is connected to the fixed contact f, the line input / output terminal switch 21 is connected. The state is switched to the state of connection to the contact point a, respectively, and the audio signal from the external microphone input terminal 33 is input to the recording system and dubbed.

Next, when plugs are not inserted into both the external microphone input terminal 33 and the line input / output terminal 22, the external microphone detection unit (EXT-MIC DET)
32 and the plug detection unit (PIN DET) 29 show that the microcomputer 31 is not connected at all,
Judging that the source of the post-recording is the built-in microphone 34,
The microphone amplifier input changeover switch 35 is switched to a state in which its movable contact is connected to the fixed contact e, and the audio signal from the built-in microphone 34 is input to the recording system and dubbed.

Next, a description will be given of a post-recording operation in a state where the external microphone input terminal 33 is not connected and a plug is connected to the line input / output terminal 22.

Since the line input / output terminal 22 is a dual-purpose terminal, a plug detection unit (PIN DET) determines whether the line input / output terminal 22 is to be used as a line input in the post-recording state or to monitor an audio signal from the built-in microphone 34 as a line output.
It cannot be determined only from information from 29.

Therefore, when the post-recording state is entered, the plug is not inserted into the external microphone input terminal 33, and when the plug is inserted into the line input / output terminal 22, the plug detection unit (PIN DET) 29 The microcomputer 31 switches the line input / output terminal changeover switch 21 to a state in which the movable contact is connected to the fixed contact c, and switches the oscillator output switch 24 to the ON state.

The oscillation frequency of the load detection signal output from the oscillator 23 is a high frequency outside the audible band, and its level is set to a minute level.

When the connection destination of the line input / output terminal 22 is the line input terminal 37 of another audio equipment B,
Since the input impedance is high, the level drop of the load detection signal is small even through the oscillator output impedance 25.

The load detection signal is transmitted to the load detection signal amplifier 2
6 and converted into a DC voltage by a load detection signal detector 29. This voltage value and the value of the reference voltage section 28 are compared with a comparator 30.
The microcomputer 31 determines from the comparison result that the connection destination of the line input / output terminal 22 is the line input terminal 37 of another audio equipment B, and sets the line input / output terminal switch 21 to the movable contact Is connected to the fixed contact a, and the recording system input changeover switch 20 is
Each of the movable contacts is switched to a state of being connected to the fixed contact e. As a result, the post-record source is from the built-in microphone 34, and the line input / output terminal 22 is a line output, and functions as a monitor terminal for the post-record audio signal from the built-in microphone 34.

Next, when the connection destination of the line input / output terminal 22 is the line output terminal 39 of another audio equipment B, the level of the load detection signal due to the oscillator output impedance 25 is reduced because the receiving impedance is low. growing. Therefore, the result of comparing the voltage value converted by the load detection signal detection unit 29 and the value of the reference voltage unit 28 by the comparator 30 through the above operation indicates to the microcomputer 31 that the line input / output terminal 22 is connected. Is a line output terminal 39 of another audio device B.

Based on the detection result, the microcomputer 31 switches the line input / output terminal switch 22 to the line input, and switches the line input / output terminal switch 21 to a state where the movable contact is connected to the fixed contact b, and the recording system input. The changeover switch 20 is switched to a state where its movable contact is connected to the fixed contact d.

That is, the video camera device A according to the present embodiment is used when the user uses the
During reproduction and stop in the TR mode, the microcomputer 31 switches the line input / output terminal switch 21 to line output.

During normal line input recording in the VTR mode, the microcomputer 31 switches the line input / output terminal changeover switch 21 to line input at the time of standby for recording.

Next, in the after-recording mode in which recording can be selectively performed from three systems of the line input / output terminal 22, the external microphone input terminal 33, and the built-in microphone 34, when the external microphone input terminal 33 is plugged in, This is detected by an external microphone detection unit (EXT-MICDET) 32, and the microcomputer 31 switches the line input / output terminal switching switch 21 based on the information alone, and switches the line input / output terminal 22 to line output.

When the post-recording mode is entered with no plug inserted into the external microphone input terminal 33, when the plug is not inserted into the line input / output terminal 22, the microcomputer 31 switches the line input / output terminal. By switching the switch 21, the line input / output terminal 22 is switched to line output.

When the dubbing mode is entered with the plug inserted into the line input / output terminal 22, the microcomputer 31 switches the line input / output terminal switch 21 to load from the line input / output terminal 22. A detection signal is output, and the load detection means detects whether the connection destination is a line output or a line input. If the connection destination is a line output, the line input / output terminal 22 is used as a line input, and the input signal therefrom is dubbed, If the connection destination is a line input, the input signal from the built-in microphone 34 is dubbed.

As described above, the line input / output terminal 2
2. In the video camera apparatus A having three post-recording sources, an external microphone input terminal 33 and a built-in microphone 34, whether the connection destination of the line input / output terminal 22 is the line input terminal 37 of another audio equipment B, Since the switching is performed while actually confirming whether the input terminal is the line output terminal 39, the input switching is not required by the user's manual operation on the menu screen or the like, and the operability can be improved.

[0046]

As described above in detail, according to the sound signal input / output switching method and apparatus and the video camera apparatus of the present invention, the first sound for inputting the first sound signal from the sound signal input / output terminal. Signal input means, second sound signal input means for inputting a second sound signal, third sound signal input means for inputting a third sound signal, and sound signal of the first sound signal input means There is switching means for automatically switching input / output switching depending on the connection status of the sound input / output terminal and the connection status of the second and third sound signal input steps. This eliminates the need for manually switching the dubbing source of the second and third sound signal input means systems, thereby improving operability.

[Brief description of the drawings]

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

FIG. 2 is a block diagram illustrating a configuration of a line input / output terminal including a load detection unit and a switching control unit of each unit in the video camera device according to one embodiment of the present invention.

[Explanation of symbols]

A video camera device B other audio equipment 1 lens 2 CCD 3 camera signal processing circuit 4 system control circuit 5 operation keys 6 microphone (microphone) 7 microphone amplifier (microphone amplifier) 8 audio signal processing circuit 9 video signal processing circuit 10 display panel DESCRIPTION OF SYMBOLS 11 Headphone amplifier 12 Speaker driver 13 Line input / output part 14 Head amplifier 15 Head 16 Headphone jack 17 Speaker 18 Line output amplifier 19 Line input amplifier 20 Recording system input switch 21 Line input / output terminal switch 22 Line input / output terminal ( First Sound Signal Input Means) 23 Oscillator 24 Oscillator Output Switch 25 Oscillator Output Impedance 26 Load Detection Signal Amplifier 27 Load Detection Signal Detector (DET) 28 Reference voltage section (REF) 29 Plug detection section (PIN DET) 30 Comparator (COMP) 31 Microcomputer (microcomputer) 32 External microphone detection section (EXT-MIC DET) 33 External microphone input terminal (third sound signal input means) ) 34 Built-in microphone (second sound signal input means) 35 Microphone amplifier input changeover switch 36 Microphone amplifier 37 Line input terminal 38 Line input amplifier 39 Line output terminal 40 Line output amplifier

Claims (10)

[Claims] A first sound signal inputting step of inputting a first sounding signal from a sound signal input / output terminal; a second sounding signal inputting step of inputting a second sound signal; A third sound signal inputting step of inputting a sound signal, and a sound signal input / output switching of the first sound signal inputting step, wherein a connection state of the sound input / output terminal and the second and third sound signal inputting steps are performed. And a switching step of automatically switching according to the connection status of the sound signal. 2. The first sound signal input step is performed by a line input / output terminal, the second sound signal input step is performed by a built-in microphone, and the third sound signal input step is performed by an external microphone input terminal. The method according to claim 1, wherein the switching is performed. 3. The sound signal input / output switching method according to claim 1, wherein the mode is a voice recording mode. 4. A first sound signal input means for inputting a first sound signal from a sound signal input / output terminal, a second sound signal input means for inputting a second sound signal, and a third sound signal input means. A third sound signal inputting means for inputting a sound signal, and a sound signal input / output switching of the first sound signal inputting means for connecting the sound input / output terminal and the second and third sound signal inputting steps. Switching means for automatically switching according to the connection status of the sound signal. 5. The first sound signal input means is a line input / output terminal, the second sound signal input means is a built-in microphone, and the third sound signal input means is an external microphone input terminal. 5. The sound signal input / output switching device according to claim 4, wherein: 6. The sound signal input / output switching device according to claim 4, wherein the mode is a voice recording mode. 7. A first sound signal input means for inputting a first sound signal from a sound signal input / output terminal, a second sound signal input means for inputting a second sound signal, and a third sound signal input means. A third sound signal inputting means for inputting a sound signal, and a sound signal input / output switching of the first sound signal inputting means for connecting the sound input / output terminal and the second and third sound signal inputting steps. Switching means for automatically switching according to the connection status of the video camera. 8. The first sound signal input means is a line input / output terminal, the second sound signal input means is a built-in microphone, and the third sound signal input means is an external microphone input terminal. The video camera device according to claim 7, wherein the video camera device is provided. 9. The video camera device according to claim 7, wherein the mode is an audio post-recording mode. 10. The device according to claim 3, further comprising a line input / output terminal, a built-in microphone and an external microphone input terminal.
In a video camera device capable of post-recording from an input source of a system, a line input / output terminal plug detecting means for detecting that a plug has been inserted into the line input / output terminal; Line input / output terminal switching means for switching between three modes of output and load detection signal output, load detection signal output means for outputting a signal for detecting a load of another connected device, and level of the load detection signal And a line input / output terminal switching means according to a detection result of the load detection means, a detection result of the line input / output terminal plug detection means, and an operation mode of the video camera device. Line input / output terminal switching control means for controlling the external microphone input terminal Video camera apparatus characterized by comprising an external line microphone input terminal plug detection means for detecting that the lug is inserted.