KR970031248A - Audio input signal automatic discrimination circuit - Google Patents

Audio input signal automatic discrimination circuit Download PDF

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Publication number
KR970031248A
KR970031248A KR1019950040112A KR19950040112A KR970031248A KR 970031248 A KR970031248 A KR 970031248A KR 1019950040112 A KR1019950040112 A KR 1019950040112A KR 19950040112 A KR19950040112 A KR 19950040112A KR 970031248 A KR970031248 A KR 970031248A
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KR
South Korea
Prior art keywords
audio
input
circuit
input signal
signal
Prior art date
Application number
KR1019950040112A
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Korean (ko)
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KR0168760B1 (en
Inventor
이남수
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.)
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Publication date
Application filed by 구자홍, 엘지전자 주식회사 filed Critical 구자홍
Priority to KR1019950040112A priority Critical patent/KR0168760B1/en
Publication of KR970031248A publication Critical patent/KR970031248A/en
Application granted granted Critical
Publication of KR0168760B1 publication Critical patent/KR0168760B1/en

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Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3005—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/03—Indexing scheme relating to amplifiers the amplifier being designed for audio applications

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Amplifiers (AREA)
  • Circuit For Audible Band Transducer (AREA)

Abstract

본 발명은 PC사운드 카드의 라인 출력단자 및 스피커 출력단자에서 출력되는 오디오 신호가 모니터에 내장된 오디오 증폭회로에 입력될때 오디오 입력 신호레벨에 의해 상기 입력된 오디오 신호를 오디오 증폭부에서 필요로하는 입력신호 레벨만큼 리미트되게 조절하여 고입력신호에 의한 오디오 증폭부의 손상 및 버언아웃(Burn-Out) 현상에 의한 오디오 회로동작을 조절할 수 있도록 한 오디오 입력신호 자동 판별회로에 관한 것으로 종래에는 일반사용자가 오디오 증폭회로가 내장된 모니터에 스피커 출력단자를 연결하여 사용할 경우 상기 오디오 증폭기의 최대입력 오디오 레벨은 2VP-P이므로 11VP-P∼18VP-P레벨이 입력될 경우 오디오 증폭기가 손상되고, 버언아웃되는 현상에 의해 화재가 발생하여 오디오 회로가 동작되지 않는 문제점이 있다.According to the present invention, when an audio signal outputted from a line output terminal and a speaker output terminal of a PC sound card is input to an audio amplifying circuit built in a monitor, an input for requiring the input audio signal by an audio amplifying unit by an audio input signal level is provided. The present invention relates to an automatic audio input signal discrimination circuit that can control audio circuit operation due to burn-out and damage to the audio amplification unit due to a high level of input signal. When the speaker output terminal is connected to a monitor with a built-in amplifier circuit, the maximum audio level of the audio amplifier is 2V PP. Therefore, if the 11V PP to 18V PP level is input, the audio amplifier is damaged and burned out. Occurs and there is a problem that the audio circuit is not operated.

본 발명은 이와같은 종래 문제점을 해결하기 위하여 오디오 증폭회로가 내장된 모니터에 PC사운드 카드의 라인 출력단자 또는 스피커 출력단자를 연결사용시 입력된 오디오신호를 비교 판단후 고입력 신호일 경우 오디오 증폭기가 필요로 하는 입력신호 레벨만큼 리미트되게 조절하므로서 오디오 증폭기의 손상을 방지하고 버언아웃 현상을 방지하여 오디오 회로를 안전하게 사용할 수 있도록 한 것으로 모니터 오디오 회로에 적용한다.The present invention requires an audio amplifier when a high input signal is determined after comparing the input audio signal when using the line output terminal or the speaker output terminal of a PC sound card to a monitor with an audio amplification circuit in order to solve such a conventional problem. By limiting the input signal level to the limit, it prevents the damage of the audio amplifier and prevents the burr out phenomenon so that the audio circuit can be used safely and is applied to the monitor audio circuit.

Description

오디오 입력신호 자동 판별회로Audio input signal automatic discrimination circuit

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제3도는 본 발명 오디오 입력신호 자동판별 회로도.3 is a circuit diagram for automatically determining audio input signal according to the present invention.

Claims (1)

L단자, R단자에 입력된 오디오 신호를 정류하는 LR정류기(11)(11A)와, L,R정류기(11)(11A)에서 정류된 오디오 신호를 설정된 기준전압과 비교하는 L, R비교기(12)(12A)와, 상기 L비교기(12)의 비교신호에 의해 저항(R11)(R12)에서 분할된 L단자의 오디오신호를 오디오 증폭기(13)의 L단자에 인가되게 스위칭하는 L선택스위치(SW11)와, 상기 L선택스위치(SW11)를 통해 고입력 신호가 스위칭출력될때 오디오증폭기(13)에서 필요로 하는 레벨만큼 조절하여 L단자에 인가하는 L가변저항(VR11)과, 상기 R비교기(12A)의 비교신호에 의해 저항(R17)(R18)에서 분할된 R단자의 오디오신호가 오디오 증폭기(13)의 R단자에 인가되게 스위칭하는 R선택스위치(SW12)와, 상기 R선택스위치(SW12)를 통해 고입력신호가 스위칭출력될때 오디오 증폭기(13)에서 필요로 하는 레벨만큼 조절하여 R단자에 인가하는 R가변저항(VR12)과, 상기 L, R단자에 입력된 오디오신호를 증폭 출력하는 오디오 증폭기(13)로 구성된 오디오 입력신호 자동 판별회로.L and R comparators for comparing the audio signals rectified by the L and R rectifiers 11 and 11A with the LR rectifiers 11 and 11A rectifying the audio signals input to the L and R terminals. 12) 12A and an L select switch for switching the audio signal of the L terminal divided by the resistors R11 and R12 to the L terminal of the audio amplifier 13 by the comparison signal of the L comparator 12. (SW11), the L variable resistance (VR11) is applied to the L terminal by adjusting the level required by the audio amplifier 13 when the high input signal is switched output through the L selection switch (SW11), and the R comparator An R select switch SW12 for switching the audio signal of the R terminal divided by the resistors R17 and R18 to be applied to the R terminal of the audio amplifier 13 by the comparison signal of 12A, and the R select switch ( When the high input signal is switched and output through SW12), it adjusts to the level required by the audio amplifier 13 to the R terminal. An audio input signal automatic discrimination circuit comprising an R variable resistor (VR12) to be applied and an audio amplifier (13) for amplifying and outputting an audio signal input to the L and R terminals. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019950040112A 1995-11-07 1995-11-07 Automatically discriminating circuit of audio input signal KR0168760B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019950040112A KR0168760B1 (en) 1995-11-07 1995-11-07 Automatically discriminating circuit of audio input signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019950040112A KR0168760B1 (en) 1995-11-07 1995-11-07 Automatically discriminating circuit of audio input signal

Publications (2)

Publication Number Publication Date
KR970031248A true KR970031248A (en) 1997-06-26
KR0168760B1 KR0168760B1 (en) 1999-03-20

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Application Number Title Priority Date Filing Date
KR1019950040112A KR0168760B1 (en) 1995-11-07 1995-11-07 Automatically discriminating circuit of audio input signal

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100511440B1 (en) * 2002-12-13 2005-08-31 티제이미디어 주식회사 Control system and its method of karaoke player's amp using analog form
KR100529530B1 (en) * 2002-12-13 2005-11-17 티제이미디어 주식회사 Control system and its method of karaoke player's amp using digital form

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100511440B1 (en) * 2002-12-13 2005-08-31 티제이미디어 주식회사 Control system and its method of karaoke player's amp using analog form
KR100529530B1 (en) * 2002-12-13 2005-11-17 티제이미디어 주식회사 Control system and its method of karaoke player's amp using digital form

Also Published As

Publication number Publication date
KR0168760B1 (en) 1999-03-20

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