KR900002472Y1 - Digital volume control circuit - Google Patents

Digital volume control circuit Download PDF

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Publication number
KR900002472Y1
KR900002472Y1 KR2019870006542U KR870006542U KR900002472Y1 KR 900002472 Y1 KR900002472 Y1 KR 900002472Y1 KR 2019870006542 U KR2019870006542 U KR 2019870006542U KR 870006542 U KR870006542 U KR 870006542U KR 900002472 Y1 KR900002472 Y1 KR 900002472Y1
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KR
South Korea
Prior art keywords
volume control
control circuit
output
converter
input terminal
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KR2019870006542U
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Korean (ko)
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KR880020744U (en
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조무희
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삼성전자주식회사
안시환
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Priority to KR2019870006542U priority Critical patent/KR900002472Y1/en
Publication of KR880020744U publication Critical patent/KR880020744U/en
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Publication of KR900002472Y1 publication Critical patent/KR900002472Y1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
    • H04M1/6033—Substation equipment, e.g. for use by subscribers including speech amplifiers for providing handsfree use or a loudspeaker mode in telephone sets
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/02—Manually-operated control

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Control Of Amplification And Gain Control (AREA)

Abstract

내용 없음.No content.

Description

디지탈 볼륨콘트롤 회로Digital volume control circuit

제 1 도는 종래의 볼륨콘트롤회로 구성도.1 is a block diagram of a conventional volume control circuit.

제 2 도는 본 고안의 회로도.2 is a circuit diagram of the present invention.

제 3 도는 제 2 도의 콘트롤 전압의 특성곡선 구성도.3 is a characteristic curve configuration diagram of the control voltage of FIG.

*도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

10 : 아날로그스위치 20 : A/D콘버터10: analog switch 20: A / D converter

30 : D-형 래치 40 : 스피커폰 IC30: D-type latch 40: speakerphone IC

11-17 : 저항 21-24 : 양방향스위치11-17: Resistor 21-24: Bidirectional Switch

본 고안은 볼륨콘트롤(Volume Control)회로에 관한 것으로, 특히 디지탈회로를 태책하여 노이즈가 감소된 볼륨콘트롤회로에 관한 것이다.The present invention relates to a volume control circuit, and more particularly, to a volume control circuit in which noise is reduced by a digital circuit.

키폰 시스템 밑 다기능 전화기에 있어서 스피커폰(Speaker Phone)통화시에 필요한 볼륨콘트롤 회로를 구성함에 있어 제 1 도와 같은 구성으로 되었는바, 스피커폰 IC의 볼륨콘트롤 입력단(VIC)에 가변저항(VR)을 직접 접속하였기 때문에 스피커폰으로 통화할때 볼륨을 가변하면 노이즈(Click음)가 발생하는 결점이 있었다.In the multifunctional telephone under the key phone system, the volume control circuit required for speaker phone call is the same as the first diagram. A variable resistor (VR) is directly connected to the volume control input (VIC) of the speaker phone IC. Because of this problem, if you change the volume when talking on the speakerphone, there was a drawback that noise (Click sound) occurs.

따라서 본 고안의 목적은 스피커플 통화시에 볼륨가변에 의한 노이즈발생을 재거할 수 디지탈 볼륨콘트롤 회로를 제공함에 있다.Therefore, an object of the present invention is to provide a digital volume control circuit that can eliminate the noise caused by the volume change during speakerphone communication.

이하 본 고안을 첨부된 도면을 참조하여 상세히 설명한다. 제 2 도는 본 고안의 일시시예에 따른 회로도로서, 도면중 11-17은 저항, 21-24는 IC로된 양방향 스위치이고 10은 아날로그스위치(또는 멀티플렉서)용 IC이다. 20은 A/D콘버터이며, 30은 D-형 래치이고, 10은 통상의 스피커폰 IC이다.Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. 2 is a circuit diagram according to a temporary embodiment of the present invention, in which 11-17 is a bidirectional switch made of a resistor, 21-24 is an IC, and 10 is an IC for an analog switch (or multiplexer). 20 is an A / D converter, 30 is a D-type latch, and 10 is a conventional speakerphone IC.

키폰시스템에서 공급되는 소정 제어신호(CONT)는 아날로그스위치(10)의 제어(선택)신호 입력단(PC)으로 인가되어 상기 아날로그스위치(10)에서 입출력단(P1)(P2)의 통로가 접속되게하고, 가변저항(12)에 걸린 소정전압은 A/D 콘버터(20)의 기준전압입력단(Vref)으로 인가되게 함과동시에 상기 아날로그스위치(10)의 출력(P2)은 아날로그입력단(Vin)에 인가되게 접속하고, 상기 A/D콘버터(20)의 출력단(A1-A4)이 D형래치(30)를 통해 양방향스위치(21-24)에 접속되어 출력단(01-04)의 디지탈신호로써 저항 (13-16)에 각각 접속된 상기 양방향 스위치(21-24)가 동작되도록 (온/오프되도록)구성하며, 또한 스피커폰IC(10)의 볼륨콘트롤 입력단(VLC)은 상기 양방향스위치(21-24)에 공통으로 접속된다.The predetermined control signal CONT supplied from the key phone system is applied to the control (selection) signal input terminal PC of the analog switch 10 so that the passage of the input / output terminals P1 and P2 is connected to the analog switch 10. The predetermined voltage applied to the variable resistor 12 is applied to the reference voltage input terminal Vref of the A / D converter 20, and at the same time, the output P2 of the analog switch 10 is connected to the analog input terminal Vin. The output terminals A1-A4 of the A / D converter 20 are connected to the bidirectional switch 21-24 through the D-type latch 30, and are connected as a digital signal of the output terminal 01-04. The bidirectional switches 21-24 respectively connected to 13-16 are operated (on / off), and the volume control input terminal VLC of the speakerphone IC 10 is connected to the bidirectional switches 21-24. ) Are commonly connected.

이상과 같은 구성을 갖는 본 고안은 제 2 도의 볼륨콘트롤 전압의 특성도와 관련하여 그 동장관계를 기술하면 다음과 같다.The present invention having the above configuration will be described below with respect to its dynamic relationship with respect to the characteristic of the volume control voltage of FIG.

키폰시스템 또는 다기능 전화기의 도시되지 않은 중앙처리장치로 부터 소정 제어신호(CONT)에 따라서 저항(11)및 가변저항(12)에 의해 분압된 전압이 아날로그스위치(10)의 입력단(P1)에 인가되어 출력단(P1)를 통해 A/D 콘버터(20)의 아날로그 입력단(Vin)에 입력되면 기준전압(Vref)과 비교된후, 상기 A/D콘버터(20)에 의하여 인가된 전압의 크기에 따라 이진수값”0000”-”1111”로 나타나는 16단계의 디지탈데이타가 단자(A1-A4)로 출력되어 래치(30)의 출력단(O1-O4)으로 부터 논리 “하이”값이 인가된 스위치는 “온”되고 논리”로우”값이 인가된 스위치는 “오프”되어, 상기 스피커폰IC(40)의 출력잔업단자(V8)에 접속된 저항(13-16)의 접속상태가 달라지므로 상기IC(40)의 불롬콘트롤 입력단자(VIC)에 인가되는 전압은 제3도의 특성곡선 구성도와 같이 변화하게되어 스피커폰 통화시에 볼륨을 정할 수 있게됨을 알수 있다.The voltage divided by the resistor 11 and the variable resistor 12 is applied to the input terminal P1 of the analog switch 10 according to a predetermined control signal CONT from a central processing unit (not shown) of the key phone system or the multifunction telephone. When input to the analog input terminal (Vin) of the A / D converter 20 through the output terminal (P1) is compared with the reference voltage (Vref), according to the magnitude of the voltage applied by the A / D converter 20 The 16 stages of digital data represented by the binary values “0000” to “1111” are output to the terminals A1 to A4, and the switch to which the logic “high” value is applied from the output terminals O1 to O4 of the latch 30 is “ The switch to which the "ON" and logic "LOW" values are applied is "OFF", so that the connection state of the resistor 13-16 connected to the output residual terminal V8 of the speakerphone IC 40 is changed. The voltage applied to the Boolean control input terminal (VIC) of) changes as shown in the characteristic curve of Fig. 3. You can see that the volume can be set during the picker phone call.

이상 상술한 바와같이 종래방식으로는 가변저항이 음성 신호를 전송하는 집적회로(스피커폰IC)에 집적 접속됨으로 인하여 통화시 볼륨을 조정하면 보이즈가 통화회로부에 그대로 전달외어 클릭음이 발생되는 결점을 해소할 수 있도록 본고안은 디지탈회로를 태책하여 가변저항의 경년변화에 영향을 받지않고 노이즈가 없는 볼륨콘트롤회로를 구현할 수 있게된다.As described above, in the conventional method, since the variable resistor is integratedly connected to an integrated circuit (speaker phone IC) that transmits a voice signal, when the volume is adjusted during a call, the voice is transmitted to the call circuit unit and the click sound is generated. In order to do so, this paper implements a noise-free volume control circuit without affecting the secular variation of the variable resistor by tackling the digital circuit.

Claims (1)

스피커폰 집적회로(40)를 구비한 전화기 시스템에 있어서, 소정제어신호(CONT)에 의해 저항(11)(12)으로 분배된 전압이 아날로그스위치(10)의 입력단(P1)을 통해 출력단(P2)으로 출력되어 A/D콘버커(20)의 아날로그 입력단(Vin)에 인가되도록한후, 상기 A/D콘버터(20)에서 출력된 디지탈 코드값이 래치(30)을 통해 양방향스위치(21-24)의 제어단자에 인가되도록 접속하여 상기 양방향스위치(21-24)의 “온/오프”상태에 따라 상기 스피커폰 집적회로(40)의 출력전압잔자(V8)와 볼륨콘트당자(VPC)간에 접속된 저항(13-16)의 조합이 달라지도록 구성함을 특징으로 하는 디지탈 볼륨 콘트롤 회로.In the telephone system having the speakerphone integrated circuit 40, the voltage divided by the predetermined control signal CONT to the resistors 11 and 12 is output through the input terminal P1 of the analog switch 10 through the output terminal P2. After outputting to the analog input terminal (Vin) of the A / D converter 20, the digital code value output from the A / D converter 20 is a bi-directional switch (21-24) through the latch 30 Is connected between the output voltage residual (V8) and the volume control (VPC) of the speaker phone integrated circuit 40 according to the "on / off" state of the bidirectional switch (21-24) A digital volume control circuit, characterized in that the combination of resistors (13-16) is varied.
KR2019870006542U 1987-04-30 1987-04-30 Digital volume control circuit KR900002472Y1 (en)

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Application Number Priority Date Filing Date Title
KR2019870006542U KR900002472Y1 (en) 1987-04-30 1987-04-30 Digital volume control circuit

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Application Number Priority Date Filing Date Title
KR2019870006542U KR900002472Y1 (en) 1987-04-30 1987-04-30 Digital volume control circuit

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KR880020744U KR880020744U (en) 1988-11-30
KR900002472Y1 true KR900002472Y1 (en) 1990-03-26

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