WO2018186526A1

WO2018186526A1 - Audio signal muting apparatus, and digital signal conversion apparatus equipped with same

Info

Publication number: WO2018186526A1
Application number: PCT/KR2017/005783
Authority: WO
Inventors: 이정호; 유승호; 안지헌; 김우석
Original assignee: 주식회사 아이리버
Priority date: 2017-04-07
Filing date: 2017-06-02
Publication date: 2018-10-11

Abstract

The present invention provides an audio signal muting apparatus which configures and adjusts timing for discarding pop noise, and on the basis of the configured and adjusted timing, mutes an audio signal. Additionally, the present invention provides a digital signal conversion apparatus connected to an audio signal playback apparatus so that when a digital audio signal is converted to an analog audio signal, the analog audio signal is muted on the basis of the timing for discarding pop noise.

Description

Audio signal muting device and digital signal conversion device having same

The present invention relates to an apparatus for muting an audio signal. The invention also relates to an apparatus connected to an audio signal reproducing apparatus for converting a digital audio signal into an analog audio signal.

When using a digital to analog converter (DAC) in an audio signal reproducing apparatus for reproducing an audio signal, it is possible to provide a user with a more clear and rich sound source. In order to further improve the sound quality of the audio signal, a digital signal conversion device, which is installed in an electronic device having an audio signal reproducing function such as an MP3 player or a car audio, allows a user to select a signal having a quality suitable for their taste and purpose. Is getting.

However, when the digital signal converter is electrically connected to the audio signal reproducing apparatus and then power is applied to the digital signal converter or the power is turned off, pop noise occurs. In addition, there is a problem that the sound quality of the audio signal is degraded due to such pop noise.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and proposes an audio signal muting apparatus that sets and adjusts timing for removing pop noise and mutes an audio signal based on the set and adjusted timings. It aims to do it.

It is also an object of the present invention to propose a digital signal conversion device which is connected to an audio signal reproducing apparatus and mutes the analog audio signal based on timing for removing pop noise when converting the digital audio signal into an analog audio signal.

However, the object of the present invention is not limited to the above-mentioned matters, and other objects not mentioned will be clearly understood by those skilled in the art from the following description.

The present invention has been made in order to achieve the above object, the timing setting unit for setting the timing for removing pop noise from the audio signal; A timing adjusting unit for adjusting the timing; And a mute control unit for muting the audio signal based on the timing.

Preferably, the mute control unit includes: a first mute processing unit configured to mute the audio signal at a point in time where negative pop noise is present based on the timing; And a second mute processing unit configured to mute the audio signal at a time when there is positive pop noise based on the timing.

Advantageously, said first mute processing section and / or said second muting processing section comprises two voltage control elements.

Preferably, the pins of the first voltage control element provided in the first mute processing unit are arranged to face the pins of the second voltage control element provided in the first mute processing unit, and the second mute processing unit The pins of the third voltage control element provided are disposed to face the pins of the fourth voltage control element provided in the second mute processing unit.

Preferably, the timing setting unit, the first voltage adjusting element for adjusting the output voltage associated with the audio signal; And a first charging element connected in parallel to the first voltage regulating element.

Preferably, one side of the first voltage regulation element is connected to a first current control element that receives a mute control signal for muting the audio signal, and the other side of the first voltage regulation element is connected to ground (GND). .

Preferably, at least two timing adjusting units are provided.

Preferably, the timing adjusting unit further comprises: a third voltage adjusting element configured to additionally adjust an output voltage with respect to the audio signal whose output voltage is adjusted by the timing setting unit; A second charging element connected in series with the third voltage regulating element through a first path; A fifth voltage adjusting element for further adjusting an output voltage with respect to the audio signal whose output voltage is adjusted by the third voltage adjusting element; And a fourth charging element connected in series with the fifth voltage regulating element.

Preferably, one side of the third voltage regulating element is connected to a second current control element connected to a first current control element receiving a mute control signal for muting the audio signal, and the other of the third voltage regulating element. A side is connected in series with the fifth voltage regulating element through a second path, one side of the fifth voltage regulating element is connected in series with the third voltage regulating element through the second path, and The other side is connected to the mute control unit.

Preferably, the first current control element is a device connected to ground to perform a switching function, and the second current control device is a device connected to a power source to perform a switching function.

Preferably, the timing setting unit sets the timing based on at least one pop noise having a magnitude greater than or equal to a first reference value, and the timing adjusting unit selects at least one pop noise having a magnitude greater than or equal to a second reference value smaller than the first reference value. Adjust the timing as a basis.

In another aspect, the present invention provides a conversion unit for converting the digital audio signal into an analog audio signal; A clock generator which determines an operation timing when converting the digital audio signal into the analog audio signal based on the digital audio signal; An amplifier for amplifying the analog audio signal; And an audio signal muting device for muting the analog audio signal based on timing for removing pop noise.

Preferably, the audio signal muting apparatus, the timing setting unit for setting a timing for removing pop noise from the analog audio signal; A timing adjusting unit for adjusting the timing; And a mute controller for muting the analog audio signal based on the timing.

The present invention can achieve the following effects through the configuration for achieving the above object.

First, it becomes possible to remove pop noise. In particular, it becomes possible to remove not only positive pop noise but also negative pop noise.

Secondly, it becomes possible to improve the quality of the audio signal.

1 is a block diagram schematically showing an internal configuration of a mute device according to an embodiment of the present invention.

2 is a circuit diagram showing in detail the internal configuration of the mute device according to an embodiment of the present invention.

3 is a reference diagram for explaining a function performed by a mute device according to an embodiment of the present invention.

4 is a block diagram schematically illustrating an internal configuration of a digital signal conversion apparatus according to an embodiment of the present invention.

5 is a conceptual diagram schematically showing an internal configuration of an audio signal muting apparatus according to a preferred embodiment of the present invention.

6 is a conceptual diagram schematically illustrating an internal configuration of a digital signal conversion apparatus according to an exemplary embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are assigned to the same components as much as possible even if displayed on different drawings. In addition, in describing the present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted. In addition, the following will describe a preferred embodiment of the present invention, but the technical idea of the present invention is not limited thereto and may be variously modified and modified by those skilled in the art.

The present invention, which can be applied to a digital signal conversion apparatus, proposes a mute apparatus for removing pop noise. Hereinafter, a mute device proposed in the present invention will be described in detail with reference to the drawings.

According to FIG. 1, the mute apparatus 100 includes a timing setting unit 110, a timing adjusting unit 120, a first muting processing unit 130, and a second muting processing unit 140.

An audio signal reproducing apparatus reproduces an audio signal. Examples of the audio signal reproducing apparatus include a computer, an image device, an MP3 player, and an audio device inside a vehicle battlefield.

The audio signal reproducing apparatus may be implemented as, for example, a hifi audio module. In this case, since the voltage level of the audio signal output from the hi-fi audio module is very high, the digital signal converter preferably includes a mute device 100 to control the high output. The mute device 100 proposed in the present invention may be included in the digital signal conversion device in consideration of the above points.

The mute device 100 has a configuration optimized for high output and may include a timing setting unit 110 and a timing adjusting unit 120 to adjust timing.

The timing setting unit 110 performs a function of first setting mute timing with respect to the audio signal when a high output audio signal is input. In detail, the timing setting unit 110 performs a function of catching the overall mute timing. The timing setting unit 110 may set a mute timing over the entire input audio signal to perform a function of catching the entire mute timing.

The timing adjusting unit 120 performs a function of adjusting the muting timing secondarily with respect to the audio signal in which the muting timing is primarily set by the timing setting unit 110. In detail, the timing adjusting unit 120 performs a function of capturing the fine timing of the mute. The timing adjusting unit 120 may perform a function of capturing the fine timing of the mute by adjusting the muting timing for each part of the audio signal in which the muting timing is set.

At least one timing adjusting unit 120 may be provided in this embodiment. Since the fine timing of the mutes is preferably performed at least twice to increase the timing accuracy, at least two timing adjusting units 120 are preferably provided in this embodiment.

When the mute device 100 includes only the timing setting unit 110, a problem may occur in that the mute device 100 generates pop noise when the mute device 100 mutes the audio signal. In the present invention, in consideration of this point, it is preferable that the mute device 100 includes at least one timing adjusting unit 120 together with the timing setting unit 110.

The first mute processing unit 130 may mute the audio signal based on the muting timing set and adjusted by the timing setting unit 110 and the timing adjusting unit 120 when a high output audio signal is input. Perform.

The digital signal conversion apparatus may be electrically connected to the audio signal reproducing apparatus to perform a function of improving the sound quality of the audio signal. In this case, the first mute processing unit 130 included in the digital signal converter may mute the audio signal at a predetermined mute timing to remove pop noise generated when the digital signal converter is turned on / off. Perform.

The first mute processor 130 may remove pop noise, particularly negative pop noise, associated with the audio signal by first muting the audio signal.

The second mute processing unit 140 mutes timing set and adjusted by the timing setting unit 110 and the timing adjusting unit 120 when the input audio signal is primarily muted at the timing determined by the first muting processing unit 130. Performs a function of secondly muting this audio signal on the basis of.

The second mute processor 140 may remove the pop noise by muting the audio signal at a predetermined timing together with the first mute processor 130. In this case, the second mute processor 140 may remove positive pop noise associated with the audio signal.

Meanwhile, in the present embodiment, the mute apparatus 100 may include only the first mute processor 130. In this case, the first mute processor 130 may perform a function of removing positive pop noise as well as negative pop noise.

The concept of the mute device 100 proposed in the present invention has been described above with reference to FIG. 1. Hereinafter, the mute device 100 will be described as an embodiment by implementing a predetermined circuit.

2 is a circuit diagram showing in detail the internal configuration of the mute device according to an embodiment of the present invention. The following description refers to FIGS. 1 and 2.

The timing setting unit 110 includes a first resistor 111 and a first capacitor 112. In the present embodiment, the first resistor 111 and the first capacitor 112 have a structure connected in parallel.

The first resistor 111 is connected to a collector of the first transistor 201 to adjust an output voltage. The first resistor 111 may be implemented as, for example, R64.

In the case of the first capacitor 112, one side thereof is connected to the collector of the first transistor 201, and the other side thereof is connected to the ground GND. The first capacitor 112 may be implemented as, for example, C222.

Meanwhile, the emitter of the first transistor 201 is connected to the ground GND, and the base of the first transistor 201 is a mute signal input unit 211 for muting the audio signal in the audio signal reproducing apparatus. Is connected to.

The mute device 100 may further include a second resistor 221 connected in parallel with the first transistor 201. In the case of the second resistor 221, one side thereof is connected to the mute signal input unit 211, and the other side thereof is connected to the ground GND. The second resistor 221 may be implemented as R106 as a protection resistor.

As described above, in the present invention, at least two timing adjusting units 120 may be provided in the muting apparatus 100. 2 illustrates an example in which two timing adjusting units 120 are provided in the mute apparatus 100. In the following description, the first timing adjusting unit 120a and the second timing adjusting unit 120b will be described in detail.

The first timing adjusting unit 120a includes a third resistor 121 and a second capacitor 122. In the present embodiment, the third resistor 121 and the second capacitor 122 have a structure connected in series.

The third resistor 121 is connected to the collector of the second transistor 202 to adjust the output voltage. The third resistor 121 may be implemented as, for example, R61.

In the case of the second capacitor 122, one side thereof is connected to the collector of the second transistor 202, and the other side thereof is connected to the ground GND. The second capacitor 122 may be implemented as, for example, C213.

Meanwhile, the emitter of the second transistor 202 is connected to Vcc, and the base of the second transistor 202 is connected to the timing setting unit 110.

Meanwhile, the mute device 100 may further include a fourth resistor 222 connected in parallel to the third resistor 121. The fourth resistor 222 performs a function of adjusting the output voltage, and may be implemented as, for example, R62. In the case of the fourth resistor 222, one side thereof is connected to the collector of the second transistor 202, and the other side thereof is connected to the ground GND.

Meanwhile, the mute device 100 may further include a third capacitor 231 connected to the timing setting unit 110. In the case of the third capacitor 231, one side thereof is connected to the first resistor 111 of the timing setting unit 110, and the other side thereof is connected to the ground GND. The third capacitor 231 may be implemented as, for example, C218.

The second timing adjuster 120b includes a fifth resistor 123 and a fourth capacitor 124. In the present embodiment, the fifth resistor 123 and the fourth capacitor 124 have a structure connected in series.

The fifth resistor 123 is connected to the first timing adjuster 120a to adjust the output voltage. The fifth resistor 123 may be implemented as, for example, R63.

In the case of the fourth capacitor 124, one side thereof is connected to the fifth resistor 123, and the other side thereof is connected to the ground GND. The fourth capacitor 124 may be implemented as, for example, C219.

Meanwhile, the mute device 100 may further include a fifth capacitor 232 and a sixth capacitor 233 connected to the second timing adjusting unit 120b. In the present exemplary embodiment, the fifth capacitor 232 and the sixth capacitor 233 have a structure connected in parallel.

In the case of the fifth capacitor 232, one side thereof is connected to the fifth resistor 123 of the second timing adjusting unit 120b, and the other side thereof is connected to the second muting processor 140. The fifth capacitor 232 may be implemented as, for example, C216.

In the case of the sixth capacitor 233, similarly to the fifth capacitor 232, one side thereof is connected to the fifth resistor 123 of the second timing adjusting unit 120b, and the other side thereof is connected to the second muting processor 140. do. The sixth capacitor 233 may be implemented as, for example, C217.

As will be described later, in the present embodiment, the second mute processing unit 140 may be implemented as a dual FET. In this case, the fifth capacitor 232 and the sixth capacitor 233 may be connected to the FETs of the second mute processor 140, respectively. The fifth capacitor 232 and the sixth capacitor 233 may be provided in the mute device 100 in an open form.

The first mute processing unit 130 includes a first field effect transistor (FET) 131 and a second FET 132. When the first mute processor 130 is implemented as a single FET, it is difficult to completely remove the pop noise, and in particular, it is difficult to solve the pop noise leaking toward the negative side. Pop noise is noise generated when power is supplied or interrupted, and refers to noise generated by a voltage of a charged capacitor when a circuit having a capacitor having a charged voltage is connected to another electric circuit.

In this embodiment, to solve this problem, the first mute processor 130 is implemented as a dual FET. In addition, in the present exemplary embodiment, the first FET 131 and the second FET (the drain and the source of the first FET 131 and the drain and the source of the second FET 132 face each other. 132 is disposed to solve the above problem.

When the audio signal received through the right input terminal AUDIO_R_IN 212 is input to the gate of the first FET 131, the first FET 131 is the timing setting unit 110 and the first timing adjusting unit 120a. ) And the audio signal is muted according to the timing determined by the second timing adjusting unit 120b to the second muting processing unit 140.

Similarly, when the audio signal received through the left input terminal AUDIO_L_IN 213 is input to the gate of the second FET 132, the second FET 132 may include the timing setting unit 110, the first timing adjusting unit 120a, and the like. The audio signal is muted according to the timing determined by the second timing adjusting unit 120b and transmitted to the second muting processing unit 140.

The second mute processing unit 140 includes a third FET 141 and a fourth FET 142. Like the first mute processor 130, the second mute processor 140 may be implemented as a dual FET. In addition, the third FET 141 and the fourth FET 142 are disposed such that the drain and the source of the third FET 141 and the drain and the source of the fourth FET 142 face each other.

When the muted audio signal is input from the first FET 131, the third FET 141 is disposed at a timing determined by the timing setting unit 110, the first timing adjusting unit 120a, and the second timing adjusting unit 120b. Accordingly, the audio signal is muted and output through the right output terminal AUDIO_R_OUT 214.

Similarly, when the muted audio signal is input from the second FET 132, the fourth FET 142 is timing determined by the timing setting unit 110, the first timing adjusting unit 120a, and the second timing adjusting unit 120b. The audio signal is muted and output through the left output terminal AUDIO_L_OUT 215.

3 is a reference diagram for explaining a function performed by a mute device according to an embodiment of the present invention. The following description refers to FIGS. 1 and 3.

The mute device 100 proposed in the present invention is to remove pop noise generated when the power supply is turned on / off after the digital signal converter is mounted on the audio signal reproducing apparatus.

Pop noise includes negative pop noise 310 and positive pop noise 320. The first mute processing unit 130 included in the mute apparatus 100 may remove the negative pop noise 310 by first muting the input audio signal according to a predetermined muting timing.

On the other hand, the second mute processor 140 provided in the mute device 100 mutes the audio signal subjected to the first mute by the first mute processor 130 secondly according to a predetermined muting timing, thereby positive pop noise 320. Can be removed.

The mute apparatus 100 proposed in the present invention has been described above with reference to FIGS. 1 to 3. Hereinafter, a digital signal converter having such a mute device 100 will be described.

According to FIG. 4, the digital signal conversion apparatus 400 includes a power supply unit 410, a clock generator 420, a converting unit 430, an amplifier 440, a mute unit 450, and a connection unit 460. .

The digital signal converter 400 is electrically connected to an audio signal reproducing apparatus (not shown) to perform a function of converting an audio signal from a digital signal to an analog signal. In detail, when an audio signal in a digital signal form is input from the audio signal reproducing apparatus, the digital signal converting apparatus 400 converts the audio signal into an analog signal form and transmits the audio signal to the audio signal reproducing apparatus. Through this process, the digital signal conversion apparatus 400 may contribute to outputting a high quality sound source by reproducing the digital content by the audio signal reproducing apparatus.

The digital signal conversion device 400 may be implemented modular in the present invention. In this case, the digital signal converter 400 may easily change, replace, or upgrade the modules, so that the user can easily change the system according to the user's request.

The digital signal converter 400 may have a high current consumption in order to contribute to the audio signal reproducing apparatus outputting a high quality sound source. In consideration of this point, the digital signal conversion device 400 may control the converting unit 430 and the amplifying unit 440 individually, thereby minimizing current consumption according to use.

The arrangement structure of the power supply unit 410, the converting unit 430, the amplifying unit 440, and the like within the digital signal converter 400 may be arbitrarily changed according to the purpose of noise reduction. In addition, the position and connection relationship of the power supply unit 410, the converting unit 430, the amplifier 440, and the like within the digital signal conversion device 400 may have a design structure optimized for the flow of data or signals.

The arrangement and design of the digital signal converter 400 may be set using hardware or software. In changing the modules constituting the digital signal conversion device 400, initialization of the flow of data or signals may be required. Such initialization may be performed by a module embedded in the hardware itself, or may be received by a separate internet or mobile app. Can be set automatically.

The power supply unit 410 functions to supply electrical energy through a physical or chemical action to the clock generator 420, the converting unit 430, the amplifier 440, the mute unit 450, and the like. The power supply unit 410 is not provided inside the digital signal converter 400, but may be located outside the digital signal converter 400 to supply power.

The power supply unit 410 may have a circuit structure for reducing noise when considering a noise sensitive characteristic of the hi-fi audio module. For example, the power supply unit 410 may include a plurality of power supply units (not shown) and noise removing units (not shown). In this case, the power supplies may be separated from each other and have an optimized voltage value to reduce noise.

The power supply may use a potential difference resulting from the ionization difference of the metal, and may include a primary battery that is not rechargeable and a rechargeable battery that is rechargeable. The type of the power supply may be changed according to the characteristics of the audio signal reproducing apparatus.

The noise removing unit removes noise induced by the power supply unit 410.

The noise removing unit may have a circuit structure in which electrical elements are sequentially connected. At this time, the circuit structure primarily uses beads to remove high frequency noise, uses a low drop out (LDO) regulator as a second, uses a capacitor having a low series equivalent resistance in the third order, and uses a large capacity capacitor in a fourth order. Can be used.

The LDO regulator regulates the voltage linearly even when the supply voltage is very close to the output voltage. LDO regulators offer low voltage drops, low ripple to reduce noise, and simple circuitry for low cost.

The clock generator 420 generates a clock signal for determining an operation timing of the digital signal converter 400. The clock generator 420 may generate a master clock (MCLK), a left-right clock (LRCK), a bit clock (BITCLK), and the like.

MCLK stands for master clock. The clock generator 420 may determine a final operation timing of the digital signal converter 400 using MCLK.

LRCK refers to the clock for the L (Left) and R (Right) channels of the digital audio signal. It may be set to 1 when the L channel information is transmitted, and may be set to 0 when the R channel information is transmitted.

BITCLK refers to a clock transmitted by engaging a bit that is the basis of a digital signal. The clock generator 420 may determine whether the digital signal is 0 or 1 by synchronizing with the bit clock using the BITCLK.

The clock signals generated by the clock generator 420 are input to the audio signal reproducing apparatus. Since the clock generator 420 uses a clock generated by a phase locked loop (PLL), the clock generator 420 can accurately generate an analog signal. The digital signal converter 400 may generate an analog signal of low jitter by directly making and using a clock through the clock generator 420.

The converting unit 430 converts the digital signal received from the audio signal reproducing apparatus into an analog signal using the synchronized control signal and the clock signals.

The converting unit 430 may be implemented as a plurality of modules. In this case, the converting unit 430 may convert a high quality analog signal through averaging of output noise. However, when the converting unit 430 is implemented as a plurality of modules, the consumption current may be increased, which may solve the above problem by individually controlling the current of the converting unit 430.

The converting unit 430 may have a spaced structure to prevent overlapping of portions in which digital noise may be induced on the internal circuit pattern. The spacing structure may be spaced apart on a two-dimensional plane or spatially spaced in layers of other layers in three-dimensional space. In this case, the separation distance may have a predetermined value or more in consideration of the size and reproduction sound quality of the digital signal conversion apparatus 400.

Synchronization is to match the operation timing of the digital signal conversion device 400 and the audio signal reproducing device, which can be implemented by unifying the reference time of the clock signals. In the present embodiment, synchronization may mean not only timing operation between modules but also data matching.

The amplifier 440 amplifies an analog signal which is an output of the converting unit 430.

The amplifier 440 may include a pre-amp for controlling an analog signal and a power-amp for amplifying a power, and an integrated amplifier in which the pre-amp and the power amplifier are combined. It is also possible to implement However, in this embodiment, the shape of the amplifier 440 is not limited thereto and may be arbitrarily changed according to the purpose and function of the digital signal converter 400.

The amplifier 440 may have a design optimized for the converting unit 430 to reduce noise. In addition, the wiring of the internal circuit of the amplifier 440 may have a maximum spaced-out structure in order to prevent duplication of portions where digital noise may be induced. Arrangement of the separation structure is the same as the case of the converting unit 430. The separation distance may have a predetermined value or more in consideration of the size of the digital signal converter 400 and the reproduction sound quality.

The mute unit 450 performs a function of muting the audio signal based on a predetermined timing. The mute unit 450 has the same concept as the mute apparatus 100 described above with reference to FIGS. 1 to 3. Therefore, a detailed description of the mute unit 450 is omitted here.

The connection unit 460 electrically or mechanically connects the digital signal converter 400 to the audio signal reproducing apparatus, and serves as a path for the electrical signal between the digital signal converter 400 and the audio signal reproducing apparatus.

The connection unit 460 receives an audio signal from the audio signal reproducing apparatus and transmits the audio signal to the converting unit 430, and may include an insulating material to prevent electrical signals from flowing into the air or the user's body.

As mentioned above, one Embodiment of this invention was described with reference to FIGS. Hereinafter, the preferable form of this invention which can be inferred from such one Embodiment is demonstrated.

According to FIG. 5, the audio signal muting apparatus 500 includes a timing setting unit 510, a timing adjusting unit 520, a muting control unit 530, a first power supply unit 540, and a first main control unit 550.

The first power supply unit 540 supplies power to each component of the audio signal muting apparatus 500. The first main controller 550 performs a function of controlling the overall operation of each component of the audio signal muting apparatus 500. Considering that the audio signal muting device 500 is provided in the digital signal conversion device 600 to be described later with reference to FIG. 6, the first power supply unit 540 and the first main control unit 550 are not provided in this embodiment. You don't have to.

The timing setting unit 510 sets a timing for removing pop noise from the audio signal. The timing setting unit 510 has the same concept as the timing setting unit 110 of FIG.

The timing setting unit 510 may include a first voltage adjusting element and a first charging element.

The first voltage regulating element is to adjust the output voltage associated with the audio signal. The first voltage regulating element is connected to a first current control element whose one side receives a mute control signal for muting the audio signal, and the other side thereof is connected to ground GND. The first voltage regulating element is a concept corresponding to the first resistor of FIG. 2, and the first current control element is a concept corresponding to the first transistor of FIG. 2.

The first charging element is connected in parallel to the first voltage regulation element. The first charging element is a concept corresponding to the first capacitor of FIG. 2.

The timing adjusting unit 520 adjusts the timing when the timing for removing pop noise is set by the timing setting unit 510. The timing adjusting unit 520 has the same concept as the timing adjusting unit 120 of FIG.

At least two timing adjusting units 520 may be provided in the audio signal muting apparatus 500. When two timing adjusting units 520 are provided in the audio signal muting device 500, the timing adjusting unit 520 may include a third voltage adjusting element, a second charging element, a fifth voltage adjusting element, and a fourth charging element. have.

The third voltage adjusting element performs a function of additionally adjusting the output voltage with respect to the audio signal whose output voltage is adjusted by the timing setting unit 510. The third voltage regulating element is connected to a second current control element connected at one side thereof to a first current control element receiving a mute control signal for muting the audio signal, and the other side of the third voltage regulating element is controlled at the fifth voltage through the second path. It is connected in series with the device. In the above description, the first current control element is a device connected to a ground to perform a switching function, and the second current control device is a device connected to a power supply to perform a switching function. The third voltage regulating element is a concept corresponding to the third resistor of FIG. 2, and the second current control element is a concept corresponding to the second transistor of FIG. 2. In addition, the fifth voltage regulating element has a concept corresponding to the fifth resistor of FIG. 2.

The fifth voltage regulating element performs a function of additionally adjusting the output voltage with respect to the audio signal whose output voltage is adjusted by the third voltage regulating element. One side of the fifth voltage regulating element is connected in series to the third voltage regulating element through the second path, and the other side thereof is connected to the mute controller.

Meanwhile, the second charging element is connected in series to the third voltage regulating element through the first path, and the fourth charging element is connected in series to the fifth voltage regulating element. The second charging element is a concept corresponding to the second capacitor of FIG. 2, and the fourth charging element is a concept corresponding to the fourth capacitor of FIG. 2.

The timing setting unit 510 performs a function of catching the entire mute timing in this embodiment, and the timing adjusting unit 520 performs a function of catching fine timing of the mute in this embodiment. In consideration of this, the timing setting unit 510 may set the timing based on at least one pop noise whose magnitude is greater than or equal to the first reference value, and the timing adjustment unit 520 is greater than or equal to the second reference value whose magnitude is smaller than the first reference value. Timing may be adjusted based on at least one pop noise.

The mute control unit 530 mutes the audio signal based on the timing when the timing for removing pop noise is set and adjusted by the timing setting unit 510 and the timing adjusting unit 520.

The mute controller 530 may include a first mute processor 531 and a second mute processor 532.

The first mute processing unit 531 performs a function of muting the audio signal at the time when negative pop noise is present based on the timing. The first mute processing unit 531 is the same concept as the first mute processing unit 130 of FIG.

The second mute processing unit 532 performs a function of muting the audio signal at the time when there is positive pop noise based on the timing. The second mute processing unit 532 has the same concept as the second mute processing unit 140 of FIG.

At least one of the first mute processor 531 and the second mute processor 532 may include two voltage control elements. When the first mute processing unit 531 includes two voltage control elements, the pins of the first voltage control element provided in the first mute processing unit 531 are second voltage controlled provided in the first mute processing unit 531. It may be arranged to face the pins of the device. In addition, the pins of the third voltage control element provided in the second mute processing unit 532 and the pins of the fourth voltage control element provided in the second mute processing unit 532 may be disposed to face each other. The first voltage control element is a concept corresponding to the first FET of FIG. 2, and the second voltage control element is a concept corresponding to the second FET of FIG. 2. Also, the pins of each voltage control element correspond to the drain and source of the FET.

Next, the digital signal conversion device 600 including the audio signal muting device 500 will be described.

According to FIG. 6, the digital signal converter 600 includes a converting unit 610, a clock generator 620, an amplifier 630, a second power supply unit 640, a second main control unit 650, and an audio signal mute. Device 500.

The second power supply 640 performs a function of supplying power to each component of the digital signal converter 600. The second main controller 650 performs a function of controlling the overall operation of each component of the digital signal conversion apparatus 600. In view of the fact that the digital signal converter 600 may be electrically connected to and operate with the audio signal reproducing apparatus, the second power supply unit 640 and the second main control unit 650 may not be provided in this embodiment. .

The converting unit 610 converts the digital audio signal into an analog audio signal. The converting unit 610 is the same concept as the converting unit 430 of FIG.

The clock generator 620 determines the operation timing when converting the digital audio signal into an analog audio signal based on the digital audio signal. The clock generator 620 has the same concept as the clock generator 420 of FIG.

The amplifier 630 amplifies the analog audio signal. The amplifier 630 is the same concept as the amplifier 440 of FIG.

The audio signal muting apparatus 500 performs a function of muting the analog audio signal based on timing for removing pop noise. The audio signal muting apparatus 500 has been described above with reference to FIG. 5, and a detailed description thereof will be omitted.

Although all components constituting the embodiments of the present invention described above are described as being combined or operating in combination, the present invention is not necessarily limited to these embodiments. In other words, within the scope of the present invention, all of the components may be selectively operated in combination with one or more. In addition, although all of the components may be implemented in one independent hardware, each or some of the components of the components are selectively combined to perform some or all of the functions combined in one or a plurality of hardware It may be implemented as a computer program having a. In addition, such a computer program is stored in a computer readable medium such as a USB memory, a CD disk, a flash memory, and the like, and is read and executed by a computer, thereby implementing embodiments of the present invention. The recording medium of the computer program may include a magnetic recording medium, an optical recording medium and the like.

In addition, all terms including technical or scientific terms have the same meaning as commonly understood by a person of ordinary skill in the art unless otherwise defined in the detailed description. Terms used generally, such as terms defined in a dictionary, should be interpreted to coincide with the contextual meaning of the related art, and shall not be interpreted in an ideal or excessively formal sense unless explicitly defined in the present invention.

The above description is merely illustrative of the technical idea of the present invention, and various modifications, changes, and substitutions may be made by those skilled in the art without departing from the essential characteristics of the present invention. will be. Accordingly, the embodiments disclosed in the present invention and the accompanying drawings are not intended to limit the technical spirit of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by the embodiments and the accompanying drawings. . The scope of protection of the present invention should be interpreted by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

The present invention can be applied to a digital signal conversion apparatus connected to an audio signal reproducing apparatus and converting a digital audio signal into an analog audio signal. In addition, the present invention can be applied to an audio signal reproducing apparatus such as a computer, an image device, an MP3 player, and an audio device inside a vehicle battlefield.

Claims

A timing setting unit that sets a timing for removing pop noise from the audio signal;

A timing adjusting unit for adjusting the timing; And

Mute control unit for muting the audio signal based on the timing

Audio signal mute device comprising a.
The method of claim 1,

The mute control unit,

A first mute processing unit to mute the audio signal at a time when negative pop noise exists based on the timing; And

A second muting processor configured to mute the audio signal at a point in time when there is positive pop noise based on the timing

Audio signal mute device comprising a.
The method of claim 2,

And the first mute processor and / or the second mute processor comprise two voltage control elements.
The method of claim 3, wherein

The pins of the first voltage control element provided in the first mute processing unit may be disposed to face the pins of the second voltage control element provided in the first mute processing unit.

And the pins of the third voltage control element provided in the second mute processing unit are arranged to face the pins of the fourth voltage control element provided in the second mute processing unit.
The method of claim 1,

The timing setting unit,

A first voltage adjusting element for adjusting an output voltage associated with said audio signal; And

A first charging element connected in parallel to the first resistor

Audio signal mute device comprising a.
The method of claim 5, wherein

One side of the first voltage regulating element is connected to a first current control element that receives a mute control signal for muting the audio signal, the other side of the first voltage regulating element is connected to ground (GND) Audio signal mute device.
The method of claim 1,

At least two timing adjusting units are provided.
The method of claim 1,

The timing adjustment unit,

A third voltage adjusting element for additionally adjusting an output voltage with respect to the audio signal whose output voltage is adjusted by the timing setting unit;

A second charging element connected in series with the third voltage regulating element through a first path;

A fifth voltage adjusting element for further adjusting an output voltage with respect to the audio signal whose output voltage is adjusted by the third voltage adjusting element; And

A fourth charging element connected in series with the fifth voltage regulating element

Audio signal mute device comprising a.
The method of claim 8,

One side of the third voltage regulation element is connected to a second current control element connected to a first current control element that receives a mute control signal for muting the audio signal, and the other side of the third voltage regulation element is a second path. Is connected in series with the fifth voltage regulating element through

One side of the fifth voltage regulating element is connected in series to the third voltage regulating element through the second path, the other side of the fifth voltage regulating element is connected to the mute control unit.
The method of claim 9,

And the first current control element is a device connected to a ground to perform a switching function, and the second current control device is a device connected to a power supply to perform a switching function.
The method of claim 1,

The timing setting unit sets the timing based on at least one pop noise having a magnitude greater than or equal to a first reference value.

And the timing adjusting unit adjusts the timing based on at least one pop noise having a magnitude greater than or equal to a second reference value smaller than the first reference value.
A converting unit converting the digital audio signal into an analog audio signal when it is input;

A clock generator which determines an operation timing when converting the digital audio signal into the analog audio signal based on the digital audio signal;

An amplifier for amplifying the analog audio signal; And

Audio signal muting device that mutes the analog audio signal based on timing for removing pop noise

Digital signal conversion apparatus comprising a.
The method of claim 12,

The audio signal mute device,

A timing setting unit which sets a timing for removing pop noise from the analog audio signal;

A timing adjusting unit for adjusting the timing; And

Mute control unit for muting the analog audio signal based on the timing

Digital signal conversion apparatus comprising a.
The method of claim 13,

The mute control unit,

A first mute processing unit to mute the audio signal at a time when negative pop noise exists based on the timing; And

A second muting processor configured to mute the audio signal at a point in time when there is positive pop noise based on the timing

Digital signal conversion apparatus comprising a.