JP2001119774A - Sound signal input device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To easily confirm the presence or absence of connection and power ON / OFF. SOLUTION: An acoustic / electric conversion element 10 converts an acoustic signal in a space into an electric signal, and an output amplifier 12 includes a conversion element 1.
The output signal of “0” is amplified, impedance-converted, and supplied from the output terminal 14 to the recording device 16. Recording device 16
The audio output terminal 14 records the audio output from the audio output terminal 14 and records it on a recording medium, and supplies the audio to the audio input terminal 18 as it is. The amplifier 20 amplifies the audio signal from the external input terminal 18, and the detector 22 detects both outputs of the amplifier 20. The display 24 is provided with a detector 22 that is at least a certain level.
Illuminates with brightness corresponding to the output voltage value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an audio signal input device.

[0002]

2. Description of the Related Art A microphone is required for recording audio except in special cases. A conventional microphone generally has a configuration shown in FIG. 9 except for a power supply portion. The acoustic / electric conversion element 110 converts an acoustic signal propagating in space into an electric signal. The output amplifier 112 amplifies the output signal of the conversion element 110 and supplies it to the output terminal 114. The output amplifier 112 also functions as an impedance conversion element. The output amplifier 112 is accommodated in the outer cylinder 116, the conversion element 110 is arranged so as to be exposed at one end of the outer cylinder 116, and the output terminal 114 is arranged at the other end of the outer cylinder 116.

[0003] Some recording devices have a microphone and only a microphone input terminal.
Some record audio signals from an external microphone. The former device is, for example, a cassette recorder with a microphone, an MD recorder with a microphone, and a video camera. The latter device is provided with a level meter for displaying the input signal level or a headphone terminal for checking the actual sound because it is necessary to check the input level or the presence or absence. Of course, they have a microphone,
Further, some devices have an external microphone terminal.

[0004]

Some devices having an external microphone terminal have both an input level meter and a headphone terminal. However, due to the miniaturization of the device and the simplicity of operation, a headphone terminal is provided. Alternatively, only the input level meter is provided, or both are not provided. In a device that does not have both a headphone terminal and an input level meter, when an external microphone is used, there is no way to specifically check whether the connection is possible and whether the external microphone is defective. As a result, although the user intends to connect an external microphone, no sound is input or noise is mixed because the microphone is not correctly connected. In addition, there has been a problem that the power of the external microphone is forgotten to be turned on, or the microphone itself is broken, so that voice cannot be recorded.

[0005] Even in a device equipped with a headphone terminal, it is impossible to check the output sound from the headphone terminal unless the headphones are carried. As a result, the input voice cannot be confirmed, and the above-described problem similarly occurs.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an audio signal input device capable of easily confirming the presence or absence of a sound input.

Another object of the present invention is to provide an audio signal input device capable of easily confirming the presence or absence of a sound input even without a level meter and headphones.

[0008]

According to the present invention, there is provided an audio signal input device for converting an audio signal into an audio / electric signal, and an audio / electric signal for externally outputting an output of the audio / electric conversion device. An output terminal, an acoustoelectric signal input terminal, a detecting means for detecting an acoustoelectric signal input to the acoustoelectric input terminal, and a display means for displaying a detection result of the detecting means. .

The audio signal input device according to the present invention also includes an audio / electric conversion means for converting an audio signal into an audio / electric signal, an audio / electric signal output terminal for externally outputting an output of the audio / electric conversion means, An electric signal input terminal, a detecting means for detecting an acoustoelectric signal inputted to the acoustoelectric input terminal, and a detection result output terminal for outputting a detection result of the detecting means are provided.

The sound signal input device according to the present invention also includes a sound collecting means for converting a sound signal into an electric signal, an output means for externally outputting an output of the sound collecting means, and an externally inputting sound signal of an external device. An input unit, a display, and a detection unit for detecting a state of the audio signal and supplying a result of the detection to the display are provided.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a schematic block diagram of a first embodiment of the present invention. Reference numeral 10 denotes an acoustic / electric conversion element that generates an electric signal corresponding to an acoustic signal in a space, and 12 denotes a conversion element 1
An output amplifier 14 amplifies the output signal of 0 and performs impedance conversion. An output terminal 14 outputs the output signal of the output amplifier 12 to an external device, for example, a recording device 16.

Reference numeral 18 denotes an audio input terminal to which an audio signal is input from the recording device 16, 20 an amplifier for amplifying the audio signal input to the audio input terminal 18, 22 a detector for detecting the output audio signal of the amplifier 20, Reference numeral 24 denotes a display for displaying the detection result of the detector 22.

The output terminal 14 and the input terminal 18 are preferably mounted on the same connector or receptor.

Referring to FIG. 2, the operation of this embodiment will be described. The sound / electric conversion element 10 converts a sound signal in the space into an electric signal, and the output amplifier 12 amplifies the output signal of the conversion element 10, converts the signal into impedance, and supplies the converted signal from the output terminal 14 to the recording device 16. The recording device 16 processes the sound output from the sound output terminal 14 and records it on a recording medium (not shown).
8 Therefore, as a result, the output signal of the output amplifier 12 is input to the amplifier 20 via the recording device 16.

The amplifier 20 amplifies the audio signal from the external input terminal 18, and the detector 22 detects both outputs of the amplifier 20. For example, if the input signal of the amplifier 20 is
Assuming that a waveform as shown in FIG. 2A is provided, the output of the detector 22 passes through a waveform as shown in FIG.
A DC waveform as shown in FIG. Display 24
Turns on with a brightness corresponding to the output voltage value of the detector 22 which is equal to or more than a certain value.

The conversion element 10 is disposed at one end of the outer cylinder 26 with a part thereof exposed to the outside air. The output amplifier 12, the amplifier 20, and the detector 22 are arranged inside the outer cylinder 26, and the audio output terminal 14 and the audio input terminal 18 are arranged at the other end of the outer cylinder 26. The display 24 is arranged on the side surface of the outer cylinder 26.

FIG. 3 shows a circuit example of the display 24. The output voltage of the detector 22 is applied to the input terminal 30. The voltage input to the input terminal 30 is divided by the resistors 32 and 34 and applied to the gate of the transistor 36. The emitter of the transistor 36 is connected to ground, and a resistor 40 and a light emitting diode (LED) 42 are connected in series between the collector and the bias voltage terminal 38.

When the voltage of the input terminal 30 exceeds a predetermined threshold value Vth, the transistor 36 becomes conductive between the collector and the emitter. When the output voltage of the detector 22 is lower than Vth, the transistor 36 does not conduct between the collector and the emitter.
The ED 42 does not emit light. The output voltage of the detector 22 is Vth
Around or slightly above, the transistor 36 begins to conduct between the collector and the emitter and the LED 4
2, a current flows. Since the amount of flowing current is still small, L
Although the ED 42 emits light, its light amount is small. As the detection voltage becomes higher than Vth, more current flows through the LED 42, and the LED 42 emits light more brightly. When the transistor 36 is saturated, a current determined by the bias voltage of the bias voltage terminal 38 and the resistor 40 flows through the LED 42,
The brightness of the ED 42 also becomes constant.

The output voltage of the detector 22 is a detection output of a signal obtained by amplifying the sound wave originally picked up by the conversion element 10. That is, the LED 42 of the display 24 is
When the sound signal converted by the above becomes a certain size or more, the light is turned on. As the sound pressure of the sound signal is increased, the light is turned on brightly, and when the sound pressure exceeds a certain level, the brightness becomes constant.

As described above, in the present embodiment, the sound signal picked up by the sound / electric conversion element 10 is again input to the sound signal input device of the present embodiment via the recording device 16, and the attached display is displayed. Since the size is displayed on the device as brightness, the presence or absence and level of voice input to the recording device 16 can be easily confirmed.

FIG. 4 is a schematic block diagram of a second embodiment of the present invention. In this embodiment, a low-pass filter (LPF) 28 is used instead of the detector 22. There is an advantage that the configuration can be simplified. This configuration can also include, for example,
When the recording device 16 digitizes and records the input audio signal and returns the digital audio signal to the audio input terminal 18, similarly to the embodiment shown in FIG.
The presence or absence of a voice input to the device 6 can be confirmed by the lighting state of the LED 42 of the display 24.

FIG. 5 is a schematic block diagram of a third embodiment of the present invention. In this embodiment, a DC output terminal 29 for outputting the detection result of the detector 22 to the outside is provided instead of the display 24. Then, a device having the same function as the display 24 is connected to the output terminal 29. FIG. 6 shows a schematic configuration block diagram of a video camera which is an example of such an apparatus.

Reference numeral 50 denotes a lens, 52 denotes an image sensor, 54 denotes a camera signal processing circuit, 56 denotes a video signal processing circuit, 58 denotes a microphone input terminal, 60 denotes a microphone amplifier, 62 denotes an audio signal processing circuit, 64 denotes a recording / reproducing unit, 66 is a viewfinder,
68 is a DC input terminal, 70 is a comparator, 72 is a reference voltage,
74 is an audio output terminal. The audio output terminal 74 is connected to the audio input terminal 18 in FIG. 5, and the DC input terminal 68 is connected to the DC output terminal 29 in FIG.

The image sensor 52 converts an optical image from the lens 50 into an electric image signal. Camera signal processing circuit 54
Performs well-known camera signal processing such as color balance adjustment and gamma correction on the output signal of the image sensor 52. The video signal processing circuit 56 performs a recording process on the output of the camera signal processing circuit 54. The output of the video signal processing circuit 56 is applied to a recording / reproducing unit 64, where it is recorded on a recording medium. The output of the video signal processing circuit 56 is also applied to a view finder 66 and displayed as an image.

The microphone input terminal 58 is connected to the audio output terminal 14 shown in FIG. An output audio signal of the microphone device shown in FIG. 5 is amplified by a microphone amplifier 60, converted into a recording form by an audio signal processing circuit 62, and
4 and recorded on the recording medium.

The output of the audio signal processing circuit 62 is also applied to an audio output terminal 74. By connecting a speaker or an earphone to the audio output terminal 74, the audio currently input to the microphone can be confirmed. In this embodiment, the audio output terminal 74 is connected to the audio input terminal 18 in FIG. Therefore,
The output of the audio signal processing circuit 62 is input to the amplifier 20 via the audio output terminal 74 and the audio input terminal 18, and is detected by the detector 22. The detection result of the detector 22 is DC
The comparator 70 is connected via the output terminal 29 and the DC input terminal 68.
To enter. The comparator 70 compares the output voltage of the detector 22 with the reference voltage 72, and supplies the comparison result to the viewfinder 66.

According to the output of the comparator 70, when the output voltage of the detector 22 exceeds the reference voltage 72, the viewfinder 66 superimposes the image on the photographed image as shown in FIG.
Displays characters indicating microphone input. This allows the user to check the presence or absence of a microphone input on the finder screen.

FIG. 8 shows a modification of the display 24. FIG.
A circuit having a similar configuration was connected in parallel to the configuration shown in FIG. 32a, 34a and 40a are resistors, 36a is a transistor, and 42a is a light emitting diode. Resistance 32, 34
The light-emitting diodes 42 and 42a emit light at different detection output levels of the detector 22 by making the voltage division ratio of the resistors 32a and 34a different from the voltage division ratio of the resistors 32a and 34a. The sound signal level can be displayed in a plurality of stages. It is clear that the level can be more easily identified by changing the emission color of the light emitting diodes 42 and 42a.

[0030]

As can be easily understood from the above description, according to the present invention, it is easy to confirm that the audio signal input device is correctly connected to the connected device and that the audio signal is being input. Can be confirmed. Even if you forget to turn on the power, you can easily check it. This enables a setting without errors.

Further, by returning the detection result of the audio signal input to the connected device, for example, when the connected device has image display means like a video camera, the input of the audio signal is displayed on the screen. By displaying the presence / absence, level, and the like, the user can easily visually confirm the presence / absence of the input of the acoustic signal, and realize recording with less errors.

By displaying the level of the input sound signal stepwise, it is easy to check the microphone input level, and it is possible to provide a more user-friendly object.

[Brief description of the drawings]

FIG. 1 is a schematic block diagram of a first embodiment of the present invention.

FIG. 2 is a waveform diagram for explanation.

FIG. 3 is a schematic circuit diagram of a display 24.

FIG. 4 is a schematic block diagram of a second embodiment of the present invention.

FIG. 5 is a schematic configuration block diagram of a third embodiment of the present invention.

6 is a schematic block diagram of a video camera connected to the embodiment shown in FIG.

FIG. 7 is a screen example of a viewfinder 66;

8 is a schematic circuit diagram of another configuration of the display 24. FIG.

FIG. 9 is a schematic block diagram of a conventional example.

[Explanation of symbols]

 10: Sound / electricity conversion element 12: Output amplifier 14: Output terminal 16: Recording device 18: Audio input terminal 20: Amplifier 22: Detector 24: Display 26: Outer cylinder 28: Low pass filter (LPF) 29: DC output Terminal 30: Input terminal 32, 32a: Resistance 34, 34a: Resistance 36, 36a: Transistor 38: Bias voltage terminal 40, 40a: Resistance 42, 42a: Light emitting diode (LED) 50: Lens 52: Image sensor 54: Camera signal Processing circuit 56: Video signal processing circuit 58: Microphone input terminal 60: Microphone amplifier 62: Audio signal processing circuit 64: Recording / reproducing section 66: Viewfinder 68: DC input terminal 70: Comparator 72: Reference voltage 74: Audio output terminal 110: sound / electric conversion element 112: output amplifier 114: output terminal 116: outer cylinder

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) // H04N 5/225 H04N 5/225 F

Claims (18)

[Claims] 1. An audio / electric conversion unit for converting an audio signal into an audio / electric signal, an audio / electric signal output terminal for externally outputting an output of the audio / electric conversion unit, an audio / electric signal input terminal, and the audio / electric signal An acoustic signal input device comprising: detecting means for detecting an acoustic electric signal input to an input terminal; and display means for displaying a detection result of the detecting means. 2. The audio signal input device according to claim 1, wherein said detection means detects that said level detection means detects a level of an acoustoelectric signal input to said acoustoelectric input terminal. 3. The acoustic signal input device according to claim 1, wherein said detection means is a detection means. 4. The acoustic signal input device according to claim 1, wherein said detection means is a low-pass filter means. 5. The acoustic signal input device according to claim 1, wherein said display means includes a light emitting means which lights up when an output of said detection means is higher than a predetermined level. 6. The display means is turned on when an output of the detection means is equal to or higher than a first predetermined level, and increases in brightness in a range up to a second predetermined level higher than the first predetermined level. The acoustic signal input device according to claim 1, further comprising: a light emitting unit that lights up and lights up at a constant brightness at or above the second predetermined level. 7. The acoustic signal input device according to claim 1, wherein the display unit includes a plurality of light emitting units that are turned on for different outputs of a predetermined level or more of the detection unit. 8. The acoustic signal input device according to claim 7, wherein the plurality of light emitting units emit light of different colors. 9. An audio / electric conversion means for converting an audio signal into an audio / electric signal, an audio / electric signal output terminal for externally outputting an output of the audio / electric conversion means, an audio / electric signal input terminal, and the audio / electric signal An acoustic signal input device comprising: a detection unit that detects an acoustic electric signal input to an input terminal; and a detection result output terminal that outputs a detection result of the detection unit. 10. The audio signal input device according to claim 9, wherein said detection means is a level detection means for detecting a level of an audio electric signal inputted to said audio electric input terminal. 11. The acoustic signal input device according to claim 9, wherein said detection means is a detection means. 12. The acoustic signal input device according to claim 9, wherein said detection means is a low-pass filter means. 13. A sound collecting means for converting an acoustic signal into an electric signal, an output means for externally outputting an output of the sound collecting means, an input means for externally inputting a sound signal of an external device, a display, A sound signal input device comprising: a detection unit that detects a state of an audio signal and supplies the detection result to the display unit. 14. The audio signal input device according to claim 13, wherein the detection unit supplies the detection result to an external display. 15. The acoustic signal input device according to claim 13, wherein the detection unit supplies the detection result to a built-in display. 16. The audio signal input device according to claim 13, wherein the display displays the state of the audio signal in a stepwise manner. 17. The audio signal input device according to claim 13, wherein the audio signal is an analog audio signal. 18. The audio signal input device according to claim 13, wherein the audio signal is a digital audio signal.