KR200485782Y1

KR200485782Y1 - Sound device controlled by proximity of source

Info

Publication number: KR200485782Y1
Application number: KR2020160007601U
Authority: KR
Inventors: 강태천
Original assignee: 강태천
Priority date: 2016-12-28
Filing date: 2016-12-28
Publication date: 2018-02-22

Abstract

The acoustic apparatus of the present invention includes: a microphone element for causing a voltage fluctuation in response to acoustic vibration output from a sound source; A signal output circuit for converting a voltage variation of the microphone element into a microphone signal and outputting the microphone signal; A signal control circuit which blocks or permits the output of the microphone signal in the signal output circuit under the control of a control stage; And an access sensor for controlling the control end of the signal control circuit in accordance with the physical distance between the microphone element and the sound source.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a sound device,

The present invention relates to an acoustic apparatus in which the operation of the microphone is controlled depending on whether a sound source is accessed or not.

Generally, the sound receiver microphone requires a certain operating voltage for its operation. When the sound pressure is applied to the microphone, the capacitance of the microphone changes and the corresponding voltage change is generated at the output terminal.

When the switch is turned on, a sudden DC voltage is applied to the output terminal of the microphone so that pop noise may occur. Also, even when the switch is turned off, the DC voltage suddenly drops to 0 V, and pop noise may occur. Such pop noise generally occurs when a microphone switch is turned on or off in a sound apparatus, and various improvements have been studied.

For example, in the Utility Model Publication No. 1985-0001037 (titled: Impulse noise canceling circuit when the power switch on and off of a sound device is turned on), for a predetermined time from the moment the power switch of the sound device is turned on or off, And the output is grounded to remove the impact sound.

On the other hand, the conventional impact sound removing circuit uses a plurality of circuit components and a plurality of sound receiving devices. However, there is a problem that the size of the circuit can be increased according to the number of used parts and the capacity of sound receiving. There is also a problem that signal deterioration may occur due to a large number of sound waves and other components.

In addition, a general sound-receiving microphone has only a purpose of receiving sound, and has not been considered with respect to consumption of electric power or proper operation on / off control according to sound reception.

Accordingly, when the microphone is not in use, the microphone may be unintentionally moved close to the speaker without putting the power on, or unpleasant howling may occur.

The present invention aims to recognize that the microphone is not in use and to automatically turn off or mute the microphone.

In addition, we want to eliminate the pop noise that occurs when the microphone power is turned on or off.

Also, a structure for connecting a microphone and a sound device is improved.

According to another aspect of the present invention, there is provided an acoustic apparatus in which an operation is controlled according to whether a sound source is accessed or not according to the present invention includes a microphone element for causing a voltage variation corresponding to acoustic vibration output from a sound source; A signal output circuit for converting a voltage variation caused by the microphone element into a microphone signal and outputting the converted microphone signal; A signal control circuit which blocks or permits the output of the microphone signal in the signal output circuit under the control of a control stage; And an access sensor for sensing the physical distance between the microphone element and the sound source and controlling the control terminal of the signal control circuit.

Also, the microphone element may cause a voltage fluctuation between the (+) and (-) terminals corresponding to the acoustic vibration output from the sound source, and the (-) terminal is connected to the ground (GND) Circuit is configured to be connected to the (+) terminal of the microphone element to output a voltage variation appearing between the GND and the (+) terminal as a microphone signal, and the signal control circuit is connected to the Wherein the signal control circuit comprises: (1) when the microphone element and the sound source are detected as being close to each other by the approach sensor, the signal control circuit The microphone signal is output through the signal output circuit, (2) the microphone element and the sound source are connected to each other by the proximity sensor, The first stage and the second stage of the signal control circuit are coupled to each other so that the microphone signal is connected to the GND and not outputted from the signal output circuit.

A first end connected to the negative end of the microphone element, a second end connected to the control end of the signal control circuit, and a control end controlling on or off states of the first end and the second end And an automatic switch, wherein the control end of the automatic switch can be controlled by the proximity sensor.

The proximity sensor may further include an output element for outputting a predetermined electromagnetic wave and an input element for receiving an electromagnetic wave reflected from the sound source and output from the output element.

A power supply circuit for providing a (+) voltage and the GND; And a bias circuit for converting the (+) voltage into a bias voltage and applying the bias voltage to the control terminal of the signal control circuit, wherein the proximity sensor controls whether the bias voltage is applied to the control terminal of the control circuit can do.

The apparatus may further include a manual switch for manually controlling the operation of the control end of the signal control circuit, and the manual switch may be connected in series with the automatic switch.

According to the acoustic device in which the operation is controlled according to the present invention having the above-described structure, when the microphone is far away from the sound source, the microphone is turned off or muted to cause unintentional howling, It is possible to prevent an unaccepted sound from being received and output.

In addition, by switching the path of the microphone signal in conjunction with the on / off switch of the microphone, pop noise can be effectively blocked.

In addition, since a microphone and a sound device can be connected to each other by using a cable provided at both ends of a widely used rod-shaped plug, it is possible to remove a used microphone and use another acoustic source in combination. Further, the connection portion according to one embodiment of the present invention may provide compatibility with various types of bar-shaped cables.

FIG. 1 is a block diagram schematically illustrating the configuration of an acoustic device in which operations are controlled according to whether a sound source is accessed according to an embodiment of the present invention.
2 is a view conceptually showing a microphone portion of an acoustic device in which operation is controlled according to whether a sound source is accessed according to an embodiment of the present invention.
3 is a diagram specifically showing a configuration and a circuit of the acoustic apparatus shown in Fig.
Fig. 4 is a diagram showing a configuration and a circuit for another embodiment of the sound device shown in Fig. 1. Fig.

Hereinafter, a preferred embodiment of an acoustic device in which operations are controlled according to whether a sound source is accessed according to the present invention will be described with reference to the accompanying drawings. For reference, the terms referring to the respective elements of the present invention are exemplarily named in consideration of their functions, and therefore, the technical contents of the present invention should not be predicted and limited in terms of the term itself.

First, with reference to a block diagram of FIG. 1, a configuration of an acoustic device in which an operation is controlled according to whether a sound source is accessed according to an embodiment of the present invention will be schematically described. First, the acoustic apparatus according to the present invention includes a microphone element 10, a manual switch 52, a signal output circuit 20, a signal control circuit 30, an approach sensor 40, a manual / (50), and a power module (60).

The microphone element 10 is a component configured to change capacitance between the (+) terminal and the (-) terminal in response to the acoustic vibration generated in the surroundings or the sound source S. A predetermined DC voltage may be applied between the (+) and (-) terminals of the microphone element 10, and the DC voltage is varied by the varying capacitance, and a microphone signal is generated by this voltage variation. The microphone signal can be sent to another acoustic device, such as an amplifier and / or a speaker, and processed.

The sound source S may be, for example, the mouth of the user or another vocal organ. In addition, the sound source S may include means for generating acoustic or physical vibrations, such as other speakers or musical instruments.

The positive terminal of the microphone element 10 may be connected to the positive terminal of the DC voltage VCC supplied from the power supply module and the negative terminal of the microphone element 10 may be connected to the negative terminal of the DC voltage or (Or a common voltage common) (in the following description, they are collectively referred to as GND).

The manual / automatic switch 50 has a microphone on / off function for controlling the microphone signal generated by the microphone element 10 to be outputted or not outputted through the signal output circuit 20 or a microphone on / A switching part or a switching circuit that selects a function to perform the function.

The manual switch 52 may be a mechanical switch operated to turn the circuit on or off as the contacts of one end and the contacts of the other end are turned on or off, and may be manually operated by the user.

The automatic switch 54 includes a switching element whose operation is controlled by the approach sensor 40 so that when the sound source S approaches the microphone element 10, When the sound source S is far away, the circuit is turned off.

The first end of the manual / automatic switch 50 may be connected to the negative terminal of the microphone element 10 and the second terminal may be connected to the control terminal (or third terminal) of the signal control circuit 30 . In the case of the automatic switch 54, the control end (or the third end) may be connected to the approach sensor 40 side.

Meanwhile, the manual switch 52 and the automatic switch 54 may be provided together in the circuit. In this case, by connecting the manual switch 52 and the automatic switch 54 in series, it is preferable to turn on or off the circuit by an AND combination of the respective switch operations.

The signal output circuit 20 couples a microphone signal to an external device such as a speaker or an amplifying device, or to an input side of another signal processing circuit incorporated in the acoustic device.

The signal control circuit 30 has a control end connected to the other end of the manual / automatic switch 50, a first end connected to the signal output circuit 20, and a second end connected to GND. The control end of the signal control circuit 30 controls connection or disconnection of the first end and the second end. Thereby, the signal control circuit 30 can select to allow the microphone signal to be outputted through the signal output circuit 20 or to go out to the GND, and this selection operation is controlled by the manual / automatic switch 50 .

That is, when the user turns on the manual switch 52 to output a microphone signal by the microphone 20 via the signal output circuit 20 or when the sound source S is close to the microphone element 10 in the approach sensor 40 The signal control circuit 30 controls the control end so that the microphone signal can be outputted as it is through the signal output circuit 20 by disconnecting (or disconnecting) the first end and the second end .

On the other hand, when the user turns off the manual switch 52 to turn off the microphone signal from the signal output circuit 20 or the user moves the microphone away from the sound source S (for example, The control end of the signal control circuit 30 is controlled so that the first and second ends are coupled so that a microphone signal is applied to the first end of the signal control circuit 30 and the second end of the signal control circuit 30, And goes through the second stage to the GND.

The approach sensor 40 can determine what object exists in front of the approach sensor 40, particularly within a predetermined distance, based on the electromagnetic wave sensed.

The proximity sensor 40 includes an output device 42 for outputting a specific wave such as an infrared ray, an ultrasonic wave, an invisible laser, an RF wave, or an electromagnetic wave; And an input element 44 that receives the incident light reflected by the light emitting device. Particularly, the output element 42 outputs pulses in a predetermined period or in the form of a pulse of a predetermined frequency, and the input element 44 analyzes the waves received in synchronization with the output element 42 to determine the distance . The access sensor 40 may be any technology capable of sensing the presence of an object within a predetermined distance and outputting an arbitrary signal. However, in this embodiment, referring to FIGS. 3 and 4, when the presence of an object is detected by the input device 44, the approach sensor driving circuit is configured to operate so that TR4 is turned on.

The power module includes a signal control circuit and a signal control circuit so that the output element 42 and the input element 44 of the proximity sensor 40 can operate so that the microphone element 10 can receive the acoustic vibration and generate a voltage fluctuation. DC voltage (i.e., VCC) is supplied to the circuit so that the output circuit can be operated.

As described above, in the acoustic device according to the present invention, the manual / automatic switch 50 of the microphone is connected to the control terminal of the signal control circuit 30, branched from the connection node between the microphone element 10 and the GND, Respectively. That is, the manual / automatic switch 50 does not directly cut off the connection line between the microphone element 10 and the GND so that the microphone element 10 can be turned on even when the manual / automatic switch 50 is in the on state or the off state The microphone signal can still be output. In this structure, the control terminal of the signal control circuit 30 is controlled by the operation of the manual / automatic switch 50, so that the microphone signal is normally outputted through the signal output circuit 20 or is outputted to the GND Can be selected.

In this way, the manual / automatic switch 50, particularly the manual switch 52, is not configured to directly turn on or off the connection path of the DC voltage applied to the microphone element as in a general microphone, The pop noise is not generated even if the user operates the manual switch 52 of the microphone from on to off or from off to on. As a result, the cause of the pop noise is essentially eliminated.

In the present invention, the microphone device 10, the proximity sensor 40 and the manual / automatic switch 50 are connected to a microphone module 150 which allows the user to carry the microphone S, Lt; / RTI > The signal output circuit 20, the signal control circuit 30 and the power supply module 60 can constitute a device body 160 for receiving and outputting a microphone signal received and output by the microphone module 150 . This distinction can be clearly understood by referring to FIGS. 2 and 4. FIG. Particularly, in the exemplary embodiment according to the present invention, in the acoustic device, the microphone module 150 and the device body 160 can be arbitrarily detachably configured. Particularly, since the wired cable 70 connecting the microphone module 150 and the device body 160 is provided with the plugs 71 and 72 on both sides thereof, the acoustic device of the present invention can be used by using the cable Make it easy to use various sound sources. This will be described later with reference to FIG.

Next, with reference to FIG. 2, a microphone module portion of the acoustic device according to an embodiment of the present invention will be described. 2 (a) shows a mode in which the microphone module 150 is viewed from the outside toward the microphone element 10. [ It can be seen that the microphone element 10 is arranged at the center of the casing and the output element 42 and the input element are arranged around the vicinity of the casing.

2 (b) shows the outer shape and cross-section of the microphone module 150 in one piece. On the upper side of the microphone module 150, there are provided a substrate (PCB) arranged so as to be positioned close to the sound source, a microphone element 10 mounted on the substrate PCB, an output element 42 of the approach sensor 40, Element 44 is shown. On one side of the microphone module 150, a manual switch 52 that can be manually operated by the user is disposed.

The wired cable 70 is connected to the other side of the microphone module 150. The wired cable 70 is not fixedly connected to the elements of the PCB by soldering or connector coupling, By inserting the plugs 71 and 72, the elements of the board PCB and the circuit of the apparatus main body 150 can be combined. The microphone module 150 and the device body 150 can be coupled to the wired cable 70 through the plugs 71 and 72 respectively so that the microphone module 150 can be connected to the plug 71 And the other sound source may be directly coupled to the plug 71 to directly input the sound source signal (that corresponds to the microphone signal) to the apparatus main body 150. [ This improves the sound source scalability of the acoustic device, particularly the device module 160 according to the present invention.

Next, referring to FIG. 3, a circuit configuration of an embodiment of an acoustic device in which operation is controlled according to whether a sound source is accessed according to the present invention will be described.

The (+) terminal of the microphone element 10 is connected to the VCC voltage side via a predetermined resistor R1 and is also connected to the resistor R3 of the signal output circuit 20 through a capacitor. One end of the manual switch 52 and the GND are simultaneously connected to the (-) end of the microphone element 10. The other end of the manual switch 52 is connected to one end of the automatic switch 54.

The other end of the automatic switch 54 is coupled to the control end (or the third end) of the signal control circuit 30. The automatic switch 54 may be constituted by a switching element TR3 and the control end of the switching element TR3 may be connected to the input element of the proximity sensor 40 via the switching element TR4 44) and GND.

The signal control circuit 30 may include a switching element TR1 and the control end of the switching element TR is coupled to the approach sensor side (i.e., the second end side of the automatic switch). The first stage of the switching device TR1 may be coupled to the output side of the signal output circuit 20 and the second stage may be coupled to the GND side.

On the other hand, a bias circuit 64 may be added to the control terminal of the signal control circuit 30. The bias circuit 64 turns off the signal control circuit 30 when the manual / automatic switch 50 is turned on And the signal control circuit 30 is turned on when the manual / automatic switch 50 is turned off.

The output element 42 and the input element 44 of the proximity sensor 40 are operated by the VCC voltage.

The acoustic apparatus according to the present invention having such a configuration operates as follows.

(1) First, the operation when the user switches the manual switch 52 on and the sound source S is sensed by the approach sensor 40 (when the sound source and the approach sensor are close enough) will be described.

The output element 42 of the proximity sensor 40 is always operated by the VCC voltage and outputs the wave of a predetermined frequency every predetermined cycle or continuously. When the input element 44 senses the wave, the switching element TR4 is turned on, thereby turning on the switching element TR3. In addition, since the manual switch 52 is already turned on, the electric charge drawn by the resistor R2 of the bias circuit 64 goes out to the GND through the switching element TR3 and the switching element TR4 (that is, No bias voltage is applied to the control terminal of the element TR1). Therefore, the switching element TR1 of the signal control circuit 30 is turned off, and the microphone signal from the (+) terminal of the microphone element 10 can be outputted to the outside through the capacitor and the resistor R3.

(2) Next, the operation when the user switches the manual switch 52 off or the sound source S is not detected by the approach sensor 40 will be described.

If the manual switch 52 is off or does not sense the reflected wave from the input element 44 of the approach sensor 40, the circuit of the manual / automatic switch 50 is opened so that the bias voltage is applied to the switching element TR1 So that the microphone signal is not output through the signal output circuit 20 and flows to the GNC through the switching element TR1. This state is called a mute state.

(3) On the other hand, when the manual switch 52 is switched from OFF to ON in a state in which the proximity sensor 40 is ON, the signal control circuit 30 will be switched from ON to OFF. The signal control circuit 30 is switched from the on state to the off state by an operation in which the switching element TR1 is switched from the on state to the off state. That is, even if the manual switch 52 is momentarily turned on by the signal characteristic of the switching element TR1, a phenomenon such as a surge does not occur in the microphone signal, thereby turning on the manual switch 52 Can be prevented.

When the user moves the microphone module 150 away from the sound source S, even if the manual switch 52 is kept in the on state, the automatic switch 54 is turned off by the operation of the approach sensor 40 It is possible to prevent undesired sound from being output even where the microphone module 150 is positioned. Even if the microphone module 150 is brought to the front of the speaker (if it is located farther from the operable distance of the proximity sensor), the microphone signal is muted and no howling occurs.

Finally, referring to FIG. 4, another embodiment of an acoustic device in which operation is controlled according to whether or not a sound source is accessed according to the present invention will be described in more detail. In particular, in the embodiment shown in FIG. 4, a sound device is composed of a microphone module 150 and an apparatus body 160, which are independently implemented, and each device can be connected to each other by a wired cable 70 Respectively.

At this time, the wired cable 70 for connecting the apparatus main body 160 and the microphone module 150 can be formed in a configuration in which plugs 71 and 72 having a plurality of terminals are formed at both ends. The wired cable 70 may be, for example, a bidirectional stereo cable having a 3.5 mm diameter plug which is readily available in the market.

The positive terminal of the microphone element 10 is connected to the first MIC terminal 71a of the first plug 71 and the positive terminal of the microphone circuit 10 is connected to the second MIC terminal 72a of the second plug 72 on the output side of the signal output circuit 20 Lt; / RTI >

The first VCC terminal 71b of the first plug 71 is connected to the voltage input of each element of the proximity sensor 40 and the second VCC terminal 72b of the second plug 72 is connected to the VCC terminal of the power module 60. [ Voltage is connected.

The negative terminal of the microphone element 10 or the second terminal of the manual switch 52 or the second terminal of the automatic switch can be connected to the first MUTE terminal 71c of the first plug 71, The control terminal of the signal control circuit 30 may be connected to the second MUTE terminal 72c.

The GND terminal of the circuit constituting the microphone module 150 is connected to the first GND terminal 71d of the first plug 71 and the GND terminal of the power module 60 is connected to the second GND terminal 71d of the second plug 72 -) voltage side or the GND side of the apparatus main body 160 can be connected.

By using the wired cable 70 having the first plug 71 and the second plug 72 as described above, it is possible to freely select and use various sound sources compatible with the plug. Even if the user keeps the cable 70 as required, the user can also use the sound device by replacing with a desired microphone module.

The embodiments of the present invention described above are merely illustrative of the technical idea of the present invention, and the scope of protection of the present invention should be interpreted by the claims. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims. It is to be understood that the invention is not limited thereto.

Claims

A microphone element for causing a voltage fluctuation in response to the acoustic vibration output from the sound source;
A signal output circuit for converting a voltage variation caused by the microphone element into a microphone signal and outputting the converted microphone signal;
A signal control circuit which blocks or permits the output of the microphone signal in the signal output circuit under the control of a control stage;
And an access sensor for sensing a physical distance between the microphone element and the sound source to control the control terminal of the signal control circuit,
(-) stage is connected to the ground (GND), and the (-) stage is connected to the ground (GND)
The signal output circuit is connected to the (+) terminal of the microphone element and is configured to output a voltage variation appearing between the GND and the (+) terminal as a microphone signal,
Wherein the signal control circuit has a first stage and a second stage that can be coupled to or separated from each other by the control stage, and the first stage is connected to the signal output circuit, GND, and the signal control circuit further comprises:
(1) when the microphone element and the sound source are detected as being close to each other by the approach sensor, the first stage and the second stage of the signal control circuit are separated from each other, whereby the microphone signal is separated from the signal output Circuit,
(2) When the microphone element and the sound source are detected as being not close to each other by the approach sensor, the first stage and the second stage of the signal control circuit are coupled to each other, whereby the microphone signal is transmitted to the GND And the operation is controlled so as not to be output from the signal output circuit.

delete

The method according to claim 1,
A first end connected to the negative end of the microphone element, a second end connected to the control end of the signal control circuit, and a control end controlling the on or off state of the first end and the second end, Further comprising a switch,
Wherein the control means controls the control end of the automatic switch by the proximity sensor.

The method according to claim 1,
Wherein the proximity sensor comprises:
An output element for outputting a predetermined electromagnetic wave;
And an input device which receives the electromagnetic waves outputted from the output device and reflected from the sound source.

The method according to claim 1,
A power supply circuit for providing a positive voltage and the GND; And
Further comprising a bias circuit for converting the positive voltage into a bias voltage and applying the bias voltage to the control terminal of the signal control circuit,
Wherein the proximity sensor controls the application of the bias voltage to the control terminal of the control circuit.

The method of claim 3,
Further comprising a manual switch for manually controlling the operation of the control end of the signal control circuit,
Wherein the manual switch is connected in series with the automatic switch.