TW519848B - Method and apparatus for eliminating microphone touching noise - Google Patents

Abstract

A method and an apparatus for eliminating microphone touching noise are disclosed in the present invention. The method includes a picking voice step, an inverse phase step and a cancellation step. In the picking voice step, two voice-picking devices are placed in the same microphone for receiving noise wave generated due to touching the microphone and respectively outputting a corresponding electric signal. In the inverse phase step, an inverse phase processing unit is connected with one of the voice picking devices to output an inverse phase electric signal. In the cancellation step, a stacking unit is connected with the output terminal of the other voice picking device and the inverse phase processing unit, respectively, so as to accumulate and cancel the electric signal outputted from the voice picking device and the inverse phase electric signal outputted by the inverse phase processing unit, such that noise generated by the microphone can be avoided.

Description

519848 V. Description of the invention (1) [Field of the invention] The present invention relates to a method for eliminating noise caused by a microphone, especially a method for electrically removing a noise, g, and a method for installing a microphone amplifier circuit. The noise wave generated by the two-touch device and the first microphone of the device is used to form and cancel the electric signal and the opposite-phase inverse electric microphone, so as to avoid the generation of noise. Noise method [Description of Known Skills] As shown in the first figure, a general wireless microphone 1 includes a base 11 with an < -amplification circuit 111, a sound receiving body 12 connected to the base 11 I, and A switch 1 3 ′, which is arranged on the base body π and is electrically connected to the amplifying circuit 丨 The sound receiving body 12 includes a housing 121 provided with a plurality of openings 122 distributed in a network shape, and The housing 121 defines an accommodating space 1 2 3 communicating with each of the openings 122. A sound pickup element 124 (shown in FIG. 1) is disposed in the accommodating space 1 2 3 and is electrically connected to the amplifier circuit 111. The box indicates it). When the switch 13 is turned on (that is, the state is ON), the pickup element 12 and the amplifying circuit 111 are in an electrically connected state, and the sound emitted by a sound source near the sound receiver 12 is emitted. The sound wave will enter the accommodation space 1 2 4 through the openings 1 2 2, and the electric signal corresponding to the sound wave will be sensed by the sound pickup element 1 2 4 and output to the amplifying circuit 111 and the electric signal After being amplified, it is output to a transmitting circuit not shown in the figure, and the audio modulating wave is transmitted by the antenna 2 and then transmitted by The receiver demodulates sound waves and amplifies them, so when the user wants to amplify and broadcast the volume, he only needs to make a sound to the receiver 12 of the microphone 1 to achieve the effect of amplification through the microphone 1. , Relatively, do not want to make a sound

Page 4 519848 V. Description of the invention (2) When the sound is enlarged, just turn off the switch, or stay away from the microphone 1 so that the sound waves do not enter the accommodation space 123. These are quite easy and autonomously controlled by the user; However, when the user turns on or off the switch, or even touches any part of the microphone 1 during use, a noise wave will be formed, and the pickup element 1 2 4 will generate a noise wave relative to the noise wave. Telegraph signal, and then a very harsh noise was broadcasted by §11 receiver, and this noise is-unneeded and unintentional to the public. However, as long as the above-mentioned noise is in the state of holding the microphone, it is often caused by Touching your hands, there will be touch noise, especially in speech occasions, speakers often use a wireless microphone to give a speech, in the process will inevitably touch the wireless microphone, resulting in the aforementioned touch noise, The way to improve it is to reduce the touch of the microphone as much as possible during use. Therefore, touch noise is a common problem generated by the current general microphones on the market ^ and it is also the solution of various operators. The problem that has been considered so far in the industry is to use a shock-absorbing spring or a rubber washer: installed in the above pickups;: taxis, to reduce the noise of touch, 'exactly, this improvement not only leads to its compensation effect It is also not good, so the dynamic noise generated by the microphone is still a problem that is not a problem. [Summary of the Invention] Therefore, one object of the present invention is a method for noise of wind. A type of device that can effectively eliminate wheat is to mention the noise of the invention. This method can completely eliminate the microphone. Therefore, the present invention eliminates the microphone touch pickup step, an inversion step, and-this method, including ~ ~ # step; the pickup step is a

Pi $ 5 page 519848 and a wheat, a first pick, and lose the first pick, and the superposition unit and the electric reverse phase electric number are opposite, so that the two pickups are noise waves, and the Telecommunication signal, phase processing of the microphone input and the output of the telecommunication is 0 and the output is reversed from the received phase. The inversion can be avoided. 5. Description of the invention (3) The microphone receives a microphone and receives the noise wave corresponding to The electric signal is converted into an inverted electric signal which is opposite to the other electric signal, and is finally added to the electric signal to make the reverse cancellation, so as to eliminate the touch noise. Furthermore, the present invention eliminates the electrical connection of the microphone amplifier circuit, the inverting processing unit 'and a superimposed single tone are connected to the first pickup, and these output signals correspond to the electrical transmission of noise waves, and the output end of the microphone The unit is connected to receive the electric signal for inverse processing. The units are respectively connected to the amplifier circuit of the microphone of the second pickup, and the signal and the output signal of the inverse processing unit are superimposed with the electric signal so as to be outputted to the after cancellation. Amplifying circuit, [Detailed description of the preferred embodiment], as shown in the first figure of Chayue, the elimination sequence is a pickup step 31 and an inverting step 31. The first pickup is used to receive the microphone when it is touched. To produce the two-phase electric signals of the same phase, the noise waves generated by the trigger are touched, and the phase of the electric signal output from one of the pickups is canceled in the inversion step, and the phase of the inverted electric signal is phased out. The electric signal and the electric signal are relatively wind-proof and the device contains noise; the two pickups receive the first pickup of the inverting processing unit output, an inverting electrical terminal, the Reverse the second pick-up signal. The method of removing the touch noise of the microphone by the electric signal and noise-free sound 3 according to step 32, and / cancel step M. The two pickups of the second pickup and the second pickup, co-occurring noise waves, and The output should correspond to the miscellaneous warrior dagger 丄 总 total 3 2 out, will be the first

V. Description of the invention --- ^ --- Pickup 5¾% Soil phase: The electric signal from the rain is transformed into an #inverted electric signal opposite to the electric signal • signal output from the second pickup, and the electric signal before and after the transformation The phase difference between the second phase signal and the reverse phase signal is 180 degrees, that is, the phase difference between the inverted phase signal and the first, second, and third phase signals is 180 degrees. Finally, use Ϊ 2 ί f Step 33, superimpose the reverse-phase electric signal with the electric signal so that the gram J1 Ψ 旎 Ψ and the electric signal are relatively canceled, so as to eliminate the electric signal generated in the wheat > It is possible to prevent t < noise from being formed after the signal is amplified. Fish> As shown in the second figure, the device 5 for eliminating the noise of the microphone is 丨 view ^: the microphone amplifier circuit 4 is electrically connected, including two pickups 51 and an inversion processing unit 53, and a superposition unit 54; The two pickups 51 and 5 2 ^ are not the first pickup 5 丨 and the second pickup 5 2 and the first pickup; 51 is a condenser or dynamic coil pickup, which is provided inside the microphone and communicates with the microphone. The outside is isolated from the outside, and the sound waves from the outside cannot enter the first pickup 5 ′ only: to receive the noise wave formed by the microphone itself, and the second pickup 52 is a moving coil or capacitive pickup, and The external communication is located on the 忒 microphone, and its setting position is the same as that of ordinary pickups. It can receive and receive external sound waves, and it can also receive noise waves caused by the microphone's own touch. Capacitive or dynamic coils described above The type pickups are all existing t-devices, which can convert the received sound waves into an electrical signal, so no further explanation will be given here. An inverting processing unit 53 includes an interconnection capacitor C1 ′ connected to the first pickup 51, an inversion amplifier circuit 531 respectively connected to the interconnection capacitor ci and a voltage source vcc, and the inversion amplifier circuit 531 mainly includes an inversion amplifier circuit 531. anti-

Page 7 519848 V. Description of the invention (5)

The direction of amplification is U1 'a resistor R connected between the parent capacitor (^ and the negative input terminal of the inverting amplifier μ 2, a feedback resistor R3 connected between the negative input terminal and the output of the inverting amplifier μ The two voltage dividing resistors, R5, and a capacitor C2 connected between the voltage source VCC and the positive input terminal of the inverting amplifier U1, so that the inverting amplifier circuit 531 can divide the voltage & R4, R5 and the capacitor. C2 divides the voltage source VCC into a DC reference voltage of the inverting amplifier ^, and inverts the signal input to the inverting amplifier circuit 531 by 180 degrees and amplifies it with a magnification of-and the inverse ballast resistor R3 It is a variable resistance, so the magnification of the inverting amplifier circuit 531 can be adjusted to an appropriate value by adjusting the resistance value of the feedback resistor M. The superimposing unit 54 includes a cross-link connected to the second pickup 52 An electric valley C3 ′ is an adder 5 41 connected to the cross-link capacitor C3 and the inverse amplifier circuit 531, and the output of the adder 5 41 is connected to the amplifier circuit 4 of the microphone.

Referring to the second, third and fourth figures, each time the noise wave generated by the microphone is touched, the pickup step 31 is performed, and the first pickup 5 and the second pickup 5 2 are received and sensed. Corresponding to the electrical signal s1, and in the inversion step 32, the electrical signal output from the first pickup 51 to the cross-link capacitor C1 is cross-connected to the inverting amplifier circuit 5 31, and via the inverting amplifier circuit 5 31 to- After the magnification of R3 / R2, the output is an inverted electrical signal 32, and the phase difference between the inverted electrical signal S 2 and the electrical signals S1 and S 3 output by the first pickup 51 and the second pickup 52 are both 1 8 〇degree, and the size is R3 / R2 times of the electric signal S1 that the first pickup has already output 1. The value of R3 can be adjusted to make the inverting electric signal S2 output by the inverse amplifier circuit 531 at point A and Second pickup

Page 8 519848 5. In the description of the invention (6), the size of the _ electric signal S3 is equal. In addition, in the canceling step 33 • The electric signal S3 output by the adder ^ wide pickup 52 is connected to the capacitor C3 via the capacitor C3. -And the ~ i, superimpose the inverse electric signal S 2 output from the inverse amplifier circuit 5 31, and the electric signal S3 output by the synthesizer 52, and the adder 541 performs a phase rotation of the size The inverting electric signal S2 of the adder 541 and the electric signal S3 of the 541 2 have a phase difference of 180 degrees, so they are relatively canceled. At the output of the adding circuit 4, no noise signal is output to the microphone to eliminate the microphone. Avoiding the noise caused by the touch 'also effectively achieves the effect of touching the noise by the wind. Alas, when a sound wave from a sound source can only enter the second pickup crying bank: Ϊ; enter the first pickup 51, the sound wave via the second pickup 52: ί ""! Signal to the superimposed unit 54 ' The first pickup 51 does not have a helmet at 4 ^ / wave, so there is no output signal. On the contrary, the inversion processing unit 53 2: outputs any signal to the superposition unit 54, so the sound cry =: the output electric signal can be directly superimposed. The unit 54 outputs to this; the 5 wind 2 is amplified and the 4 is amplified and output. = 'The method and device of the present invention described above are not only used on Yixianxikefeng, but can be used for any type of microphone, Such as wired, wireless or other types, will not be listed here one by one. &Quot; ,,,,, " Methods of the invention " The method and device for eliminating noises caused by microphone touch in the present invention use a microphone to simultaneously receive touch microphones-movements at the same time. Among them-the electrical signal induced by the pickup and the reverse phase: force; the reverse phase electrical signals with opposite phases cancel each other out to avoid touching; = 519848 V. Description of the invention (7) The electric signal enters the amplifier circuit of the microphone to amplify Output to achieve noise elimination However, the above are only the preferred embodiments of the present invention, so any equivalent structural changes in the application of the patent specification and patent application scope of the present invention should be included in the patent scope of the present invention.

519848 Brief description of diagrams Figure ^^ is the intention of a general microphone. The second figure is a step block diagram of the preferred embodiment of the present invention. The third figure is a circuit diagram of a preferred embodiment of the present invention. The fourth figure is a schematic diagram of signals in the preferred embodiment. Reference number in the drawing: 3 Method for removing noise from microphone touch 31 Pickup step 32 Inversion step 33 Cancellation step 4 Microphone amplifier circuit 5 Device for removing noise from microphone touch 51 First pickup 52 First-pickup 53 Reverse processing XJV7 Early morning 531 Inverting amplifier circuit U1 Inverting amplifier R2 Resistor R3 Feedback resistor R4, R5 Voltage dividing resistor C1, C3 Interconnecting capacitor VCC Voltage source 54 Superposition unit 541 Actuator S1, S3 Electrical signal S2 Inverting electrical signal

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Claims (1)

、 Applicable patent scope ~ Kind of elimination ☆ cool " " The method of being touched by noise "is used to eliminate the noise generated by the microphone's amplifying noise. The second tone step: Receive the stray wave with two pickups, # output _ signal corresponding to the electric signal; heart wave, and merge with another 3:? 丄 to transform the electric signal output from its pickup; g state wheel The inverted electric signal is in the opposite phase of the electric signal to make the tf step. The inverted electric signal and the electric signal are superimposed, and the inverted electric signal and the electric signal are relatively cancelled. 3) According to the method for eliminating microphone touch noise according to item 1 of the scope of the patent application, in the inversion step, the electrical signal of a pickup is transformed with a phase difference of 180 degrees, so that the converted inverse electrical signal is converted. The phase of the electrical signal output from another pickup is 80 degrees. A device for eliminating noise caused by a microphone's touch is electrically connected to an amplifier circuit of a microphone to eliminate noise generated by the touch of a microphone, and the noise generated by the amplifier's amplifier circuit is amplified. The device includes: 'Two pickups' are the first pickup and the second pickup, and the pickups receive the noise wave and induce the electric signal corresponding to the noise wave'; an inversion processing unit and the first pickup The output end is connected to receive the electric signal 'output by the first pickup, and invert the electric signal' to output an inverted electric signal; Page 12 519848-VI. Application scope A superimposing unit is connected to the output end of the first pickup, the inversion processing unit and the amplifier circuit of the microphone, respectively, so as to receive the motor output from the first pickup and the inverse signal output from the δ Xuan inversion processing unit. And superimpose the inverse electrical signal with the electrical signal so that the inverse electrical signal and the electrical signal are relatively canceled out and then output to the amplifier circuit. • The device for eliminating noise caused by microphone touch according to item 3 of the scope of patent application, wherein the inversion processing performed by the inversion processing unit ^ transforms the electrical signal with a phase difference of 180 degrees, so that the converted inversion The phase of the signal is 180 degrees out of phase with the signal. • A device according to the scope of the patent application, wherein the first touches the wave emitted by the microphone and the second pickup wave. Item 3 eliminates the noise of a microphone. The noise is communicated with the outside world, and the syllable communicates with the outside world. It is isolated by the wind and touches the noise. It can only receive outside sounds. It can receive outside sounds. 7 8 Shenkouli; ΓΠ: Describes the elimination of microphone touch noise < straight-肀 The first pickup state is a thunderbolt k stand. The second pickup is a movable coil pickup. Device, which is eliminated as described in item 3 of the scope; the device, wherein the first pickup = wind-induced noise, and the second pickup is a capacitive pickup coil pickup, according to item 3 of the scope of patent application The device: wherein, the reverse phase, the processing unit spoons two grams of wind and touches the noise of the connection of the cross-connected electricity [a and the cross-linked electricity; :: the reverse-amplified electricity connected to the-pickup valley Page 13 519848 6. Scope of Patent Application Road. 9 · The device for eliminating noise caused by microphone touch according to item 8 of the scope of the patent application, wherein the superimposing unit includes a cross-connect capacitor connected to the second pickup, an adder connected to the cross-connect capacitor and the inverse amplifier circuit . Page 14