KR19980027362U - POP noise canceller in microphone - Google Patents

POP noise canceller in microphone Download PDF

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Publication number
KR19980027362U
KR19980027362U KR2019960040295U KR19960040295U KR19980027362U KR 19980027362 U KR19980027362 U KR 19980027362U KR 2019960040295 U KR2019960040295 U KR 2019960040295U KR 19960040295 U KR19960040295 U KR 19960040295U KR 19980027362 U KR19980027362 U KR 19980027362U
Authority
KR
South Korea
Prior art keywords
microphone
pop noise
unit
sound
pop
Prior art date
Application number
KR2019960040295U
Other languages
Korean (ko)
Inventor
이창균
Original Assignee
구자홍
엘지전자 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 구자홍, 엘지전자 주식회사 filed Critical 구자홍
Priority to KR2019960040295U priority Critical patent/KR19980027362U/en
Publication of KR19980027362U publication Critical patent/KR19980027362U/en

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00Circuits for transducers, loudspeakers or microphones

Abstract

The present invention relates to a pop noise removing circuit of a microphone for removing pop noise generated when a microphone is inserted. In an audio device having a microphone jack, a pop for removing pop noise from an audio signal output from the microphone jack is provided. Maximizes the compatibility of microphones using alternating condenser or dynamic microphones by providing a pop-noise removal device for microphones including a noise removal unit and an audio signal processing unit for processing a sound signal from which pop-noise has been removed by the pop-noise removal unit. Let's do it.

Description

POP noise canceller in microphone

The present invention relates to a pop noise canceling circuit of a microphone for removing pop noise generated when the microphone is inserted.

In general, an audio device (audio system) is provided with a jack for mounting a microphone, a sound card for processing an electrical signal of the jack, and amplified signal output from the sound card to output to the speaker.

In this case, the microphone is typically classified into a condenser microphone and a dynamic microphone. Since the condenser microphone has a relatively high internal resistance of 1.2 kΩ, a constant voltage power supply is required and long-range sensitivity is good, whereas the dynamic microphone has an internal resistance. Since it is relatively low as 600Ω, it does not need a power supply voltage and has a poor remote sensitivity.

The conventional technology is to alternately use different microphones by mounting a control circuit capable of supplying and cutting off power so that the two types of microphones can be used in a general sound system or audio system.

In other words, when the condenser microphone is inserted into the microphone terminal (jack), DC signal (approximately 2.5 to 3.0V) is applied to the microphone signal, whereas when the dynamic microphone is inserted into the jack, current flows instantaneously between the microphone signal and ground. This acts as the jack terminal input of the sound card, producing pop noise. In the environment in which such pop (POP) noise exists, a sound recording apparatus is used.

The problem according to the prior art is that when the condenser microphone and the dynamic microphone are alternately used in a general acoustic device, pop noise occurs while inserting the dynamic microphone and inserting the condenser microphone into a jack installed in the acoustic device for use. Therefore, there is a problem that the sound is uneven and does not satisfy the user's sound.

The present invention has been made to solve the above problems, and provides a pop noise removing device of the microphone to remove the pop noise since the sound signal of the condenser microphone and the acoustic signal of the dynamic microphone are transmitted separately from the pop noise removing unit. The purpose is.

1 is a block diagram of an apparatus including a pop noise removing circuit according to the present invention

2 is a detailed view showing a pop noise removing circuit according to the present invention

* Description of the symbols for the main parts of the drawings *

10: microphone jack 20: pop noise removing unit

30: audio signal processor 40: switching unit

50: condenser microphone sound transmission unit 60: dynamic microphone sound transmission unit

The present invention is a sound device provided with a microphone jack, a pop noise removing unit for removing the pop noise from the sound signal output from the microphone jack, the audio signal processing the audio signal from which the pop noise is removed from the pop noise removing unit It provides a pop noise canceling device for a microphone including a signal processor, thereby maximizing compatibility of the microphone using alternating condenser or dynamic microphone.

Hereinafter, the pop noise removing device of the microphone according to the present invention will be described in detail.

1 is a block diagram of a device including a pop noise removing circuit according to the present invention, Figure 2 is a detailed view showing a pop noise removing circuit according to the present invention.

According to the present invention, as shown in Figure 1, a condenser or a dynamic microphone is inserted into the microphone jack 10 receives a sound signal electrically modulated voice, and the sound signal output from the microphone jack 10 A pop noise removing unit 20 for removing the pop noise contained in the, and an audio signal processing unit 30 for properly processing the sound signal removed from the pop noise removing unit 20.

As shown in FIG. 2, the pop noise removing unit 20 detects whether a condenser or a dynamic microphone is switched to the corresponding circuit and switches the condenser microphone by switching the switching unit 40. A condenser microphone sound transmitter 50 for transmitting an acoustic signal, and a dynamic microphone sound transmitter 60 for removing pop noise from the sound signal of the dynamic microphone by switching the switching unit 40 and transmitting the removed sound signal. )

The switching unit 40 is composed of a plurality of resistance elements (R1, R2) and a transistor (Q1), the condenser microphone sound transmission unit 50 is composed of a transistor (Q4), the dynamic microphone sound transmission unit Numeral 60 is composed of a plurality of transistors Q2 and Q3, resistors R3, R4 and R5 and an electrolytic capacitor C1.

Operation according to the present invention configured as described above, first, the voltage of about 2.5V to 3.0V is applied between the microphone signal terminal and the ground in order to use the condenser microphone.

first ; When a dynamic microphone is inserted

When the dynamic microphone is inserted into the microphone jack 10, the transistor Q1 is not operated because a voltage of less than 0.5V is applied to the resistor R2 of the switching unit 40.

The transistor is typically conducted by an operating voltage of 0.6V to 0.7V.

Since the transistor Q1 of the switching unit 40 is not operated, a bias voltage applied through the resistor R5 of the dynamic microphone sound transmitting unit 60 operates the transistors Q2 and Q3.

At this time, the transistor Q4 is not operated by the operation of the transistor Q3.

Subsequently, the acoustic signal of the dynamic microphone is transmitted through the electrolytic capacitor C1 by the operation of the transistor Q2. At this time, the beaked pop noise generated is removed from the electrolytic capacitor C1.

That is, since the DC power applied to the dynamic microphone is cut off by the electrolytic capacitor C1, pop noise generated at the time of dynamic insertion is eliminated.

The sound signal thus removed is processed by the audio signal processor 30 to appear as sound.

second ; When a condenser microphone is inserted

When the condenser microphone is inserted into the microphone jack 10, the transistor Q1 is operated because a voltage of about 0.6 V to 0.7 V or more is applied to the resistor R2 of the switching unit 40.

By the operation of the transistor Q1, the bias voltage through the resistance element R5 of the dynamic microphone sound transmitting unit 60 exits to the ground. At this time, the transistors Q2 and Q3 of the dynamic microphone sound transmitting unit 60 operate. You can see that it is not a dynamic microphone.

At this time, since the power applied to the transistor Q3 is a low signal, the transistor Q4 of the condenser microphone sound transmitting unit 50 is operated.

Therefore, the electric sound signal of the condenser microphone is transmitted to the audio signal processor 30 through the condenser microphone sound transmission unit 50 and reproduced as sound.

As a result, the voltage applied to the resistance element R2 of the switching unit 40 is changed by the resistance change of the microphone inserted into the microphone jack 10, and the type of the microphone is detected and transmitted according to the change. A negative signal is output.

The operation state of the transistors Q1, Q2, Q3, and Q4 in the pop noise removing unit 20 shows that a dynamic microphone is inserted by the operation of the transistors Q2 and Q3 to generate sound. It can be seen that the condenser microphone is inserted by the operation of Q1 and Q4 to generate the sound.

The pop noise canceling device of the microphone according to the present invention alternately uses a condenser or a dynamic microphone, thereby maximizing the compatibility of microphones having different characteristics.

Claims (2)

  1. An acoustic device having a microphone jack;
    A pop noise removing unit for removing pop noise from the sound signal output from the microphone jack;
    And an audio signal processing unit for processing a sound signal from which the pop noise is removed by the pop noise removing unit.
  2. The method of claim 1,
    The pop noise removing unit
    A switching unit for detecting whether a microphone inserted into the microphone jack is a condenser or a dynamic microphone and switching to a corresponding circuit;
    A condenser microphone sound transmission unit for transmitting the sound signal output from the condenser microphone by switching the switching unit;
    And a dynamic microphone sound transmitting unit for removing pop noise from the sound signal output from the dynamic microphone and transmitting the signal by switching the switching unit.
KR2019960040295U 1996-11-15 1996-11-15 POP noise canceller in microphone KR19980027362U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR2019960040295U KR19980027362U (en) 1996-11-15 1996-11-15 POP noise canceller in microphone

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR2019960040295U KR19980027362U (en) 1996-11-15 1996-11-15 POP noise canceller in microphone

Publications (1)

Publication Number Publication Date
KR19980027362U true KR19980027362U (en) 1998-08-05

Family

ID=53983529

Family Applications (1)

Application Number Title Priority Date Filing Date
KR2019960040295U KR19980027362U (en) 1996-11-15 1996-11-15 POP noise canceller in microphone

Country Status (1)

Country Link
KR (1) KR19980027362U (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20140055362A (en) * 2012-10-31 2014-05-09 현대모비스 주식회사 Lighting system for vehicle and control method thereof
KR20140055364A (en) * 2012-10-31 2014-05-09 현대모비스 주식회사 Lighting system for vehicle and control method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20140055362A (en) * 2012-10-31 2014-05-09 현대모비스 주식회사 Lighting system for vehicle and control method thereof
KR20140055364A (en) * 2012-10-31 2014-05-09 현대모비스 주식회사 Lighting system for vehicle and control method thereof

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