KR900008896Y1 - Noise reduction circuit for the tape of part without signal - Google Patents
Noise reduction circuit for the tape of part without signal Download PDFInfo
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- KR900008896Y1 KR900008896Y1 KR2019870004289U KR870004289U KR900008896Y1 KR 900008896 Y1 KR900008896 Y1 KR 900008896Y1 KR 2019870004289 U KR2019870004289 U KR 2019870004289U KR 870004289 U KR870004289 U KR 870004289U KR 900008896 Y1 KR900008896 Y1 KR 900008896Y1
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- signal
- output
- amplifier
- high frequency
- noise
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- 238000001514 detection method Methods 0.000 claims description 7
- 239000003990 capacitor Substances 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000005236 sound signal Effects 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/24—Signal processing not specific to the method of recording or reproducing; Circuits therefor for reducing noise
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- 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
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B2220/00—Record carriers by type
- G11B2220/90—Tape-like record carriers
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
- Signal Processing Not Specific To The Method Of Recording And Reproducing (AREA)
Abstract
내용 없음.No content.
Description
제 1 도는 본 고안에 따른 회로도.1 is a circuit diagram according to the present invention.
제 2 도는 본 고안에 따른 제 1 도의 동작 파형도.2 is an operational waveform diagram of FIG. 1 according to the present invention.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
HEAD : 헤드 EQ : 이퀄라이즈 앰프HEAD: Head EQ: Equalized Amplifier
LPF : 저역통과필터 AMP : 증폭회로LPF: Low Pass Filter AMP: Amplification Circuit
D₁ : 파이오드 C₁ : 캐패시터D₁: Fiode C₁: Capacitor
R₁-R₄ : 저항 VR₁ : 가변저항R₁-R₄: Resistance VR₁: Variable resistor
OP : 연산증폭기 TA : 톤앰프OP: Operational Amplifier TA: Tone Amplifier
TR₁TR₂ : 트랜지스터 6 : 검파회로TR₁TR₂: Transistor 6: Detection Circuit
7 : 비교기 8 : 고주파 노이즈 제거회로7: Comparator 8: High Frequency Noise Reduction Circuit
본 고안은 테이프 공란 무신호부 노이즈(Noise) 제거(Cut) 회로에 관한 것이다.The present invention relates to a tape blank signal-free noise cancellation circuit.
일반적으로 오디오(Audio)테이프는 오디오 부분과 무신호 부분이 존재되어 있는 것으로 테이프 회로에서는 헤드에 테이프가 통과하여 헤드가 감지하면 이를 이퀄라이즈 앰프를 통해 톤(Tone)단을 거쳐 파우어(Power)앰프로 출력하게 하였다. 이에 따라 종래는 테이프의 처음 녹음되지 않은 고주파 신호부 노이즈와 곡간의 공란에 녹음되지 않은 부분의 노이즈가 톤을 거쳐 파우어 앰프로 출력된다. 이때 스피커를 동작시키면 시청자의 볼륨 업(up)으로 계속해서 고주파 노이즈가 크게 피익-하는 소리로 시청자 귀를 거슬려 불쾌감을 주며, 음악 감상을 잘 즐길수 없는 결점이 있었다.In general, an audio tape has an audio portion and a non-signal portion. In a tape circuit, when a tape passes through the head and the head senses it, it is passed through a tone stage through an equalization amplifier and a power amplifier. To output. Accordingly, conventionally, the high frequency signal portion of the tape that is not recorded first and the noise of the portion that is not recorded in the space between the pieces of music are output to the power amplifier through the tone. In this case, when the speaker is operated, the high frequency noise continues to be greatly picked up by the volume up of the viewer, causing an unpleasant discomfort to the viewer's ear, and there was a defect in not being able to enjoy music well.
따라서 본 고안은 종래의 문제점을 해결하기 위해 테이프의 공란의 고주파 성분을 완전히 제거할 수 있는 회로를 제공하는데 그 목적이 있다.Accordingly, an object of the present invention is to provide a circuit capable of completely removing high frequency components of a blank of a tape to solve a conventional problem.
이하 본 고안을 첨부된 도면을 참조하여 상세히 설명한다.Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
제 1 도는 본 고안에 따른 회로도로서, 헤드(HEAD)로부터 감지한 신호를 이퀄라이즈 앰프(EQ)를 통과하여 낮은 노이즈 성분을 제거하는 저역통과 필터(LPF)와 상기 저역 통과 필터(LPF)로부터 출력된 신호를 고주파 노이즈 신호를 충분히 증폭하는 증폭회로(AMP)와 상기 증폭회로(AMP)의 출력으로부터 다이오드(D₁)에서 검파하여 캐패시터(C₁)와 방전저항(R₁)으로부터 소정신호를 출력하는 검파회로(6)와, 상기 검파회로(6)의 출력 노이즈 신호를 입력저항(R₂)을 통해 연산증폭기(OP)에 입력하여 가변저항(VR₁)의 조정에 따라 음악 신호와 고주파 노이즈 신호를 비교하는 비교기(7)와, 상기 이퀄라이즈 앰프(EQ)의 출력에서 톤을 증폭하는 톤 앰프(TA)와 상기 비교기(7)의 출력에 따라 트랜지스터(TR₁,TR₂)를 제어하여 상기 톤 앰프(TA)의 출력 고주파 노이즈, 신호를 제거하는 고주파 노이즈 제거회로(8)로 구성된다.1 is a circuit diagram according to the present invention, and outputs from a low pass filter (LPF) and the low pass filter (LPF) for removing a low noise component by passing the signal sensed from the head (HEAD) through the equalizing amplifier (EQ) An amplifying circuit AMP for sufficiently amplifying the high frequency noise signal and a detection circuit for detecting a signal from the output of the amplifying circuit AMP with a diode D 'and outputting a predetermined signal from the capacitor C' and the discharge resistor R '. (6) and a comparator for inputting the output noise signal of the detection circuit 6 to the operational amplifier OP through the input resistor R2 and comparing the music signal with the high frequency noise signal according to the adjustment of the variable resistor VR '. 7 and the transistors TR 'and TR2 in accordance with the output of the tone amplifier TA and the comparator 7 which amplify the tone at the output of the equalizing amplifier EQ, thereby controlling the tone amplifier TA. Output high frequency noise, the signal It consists of going to the high-frequency noise reduction circuit (8) for.
제 2 도는 본 고안에 따른 제 1 도의 동작 파형도로서 (A)파형은 이퀄라이즈 앰프(EQ)의 출력이고, (B)파형은 상기 (A)파형 출력에 따른 저역통과필터(LPF)의 출력이며, (C)파형은 상기 (B)파형의 출력에 따른 검파회로(6)의 출력의 예이다.2 is an operating waveform diagram of FIG. 1 according to the present invention, in which (A) waveform is an output of an equalizing amplifier (EQ), and (B) waveform is an output of a low pass filter (LPF) according to (A) waveform output. (C) waveform is an example of the output of the detection circuit 6 according to the output of the (B) waveform.
따라서 본 고안의 구체적 일실시예를 상술한 제 1,2 도를 참조하여 상세히 기술하면, 헤드(HEAD)를 통해 감지한 신호가 이퀄라이즈 앰프(EQ)를 통하여 일부 톤 앰프(TA)와 저역통과필터(LPF)로 입력된다.Therefore, when a specific embodiment of the present invention is described in detail with reference to FIGS. 1 and 2, the signal sensed through the head HEAD is low-passed through the tone amplifier TA through the equalizing amplifier EQ. Input to the filter LPF.
상기 신호가 고주파 노이즈 잡음시 제 2 도의 잡음부분의 (A)신호가 되며 이 신호를 저역통과필터(LPF)를 통과하면 제 2 도의 (B)신호와 같이 저역성분이 제거된 채로 출력된다.When the signal is a high frequency noise noise, the signal becomes the (A) signal of the noise part of FIG. 2 and passes through the low pass filter (LPF), and the low pass component is removed with the low-pass component like the signal (B) of FIG.
상기 저역통과필터(LPF) 출력을 증폭기(AMP)에서 충분히 구동하도록 증폭하여 검파다이오드(D₁)에서 검파한다. 이 검파된 신호가 캐패시터(C₁)와 방전저항(R₁)을 지나 제 2 도 (c)와 같이 출력되어 입력저항(R₂)를 통해 연산증폭기(OP)의 비반전단(+)으로 입력되면 연산증폭기(OP)의 반전단(-)의 가변저항(VR₁)의 조정에 따라 연산증폭기(OP)에서 입력 고주파 노이즈 신호를 설정값과 비교하게 된다.The low pass filter LPF output is amplified to be sufficiently driven by the amplifier AMP and detected by the detection diode D '. When the detected signal is output as shown in FIG. 2 (c) through the capacitor C₁ and the discharge resistor R₁ and is input to the non-inverting terminal (+) of the operational amplifier OP through the input resistor R₂, the operational amplifier The input high frequency noise signal is compared with the set value by the operational amplifier OP according to the adjustment of the variable resistor VR 'of the inverting terminal (-) of (OP).
여기서 노이즈이면 기준 가변저항(VR₁)의 값보다 적어 "로우"가 출력되어 트랜지스터(TR₁)를 오프한다. 이때 전원(B+)이 트랜지스터(TR₂)의 베이스로 저항(R₄)을 통해 입력되어 트랜지스터(TR₂)를 온하므로 현재 고주파 노이즈임이 되어 톤앰프(TA)의 노이즈가 트랜지스터(TR₂)의 에미터로 빠진다.If the noise is less than the value of the reference variable resistor VR ', " low " is output to turn off the transistor TR'. At this time, the power source B + is inputted through the resistor R₄ to the base of the transistor TR₂ and turns on the transistor TR₂. Falls out.
따라서 파우워 앰프단으로 고주파 노이즈 신호가 들어갈시 제로의 신호가 입력되기 때문에 스피커에 아무런 잡음이 발생되지 않는다.Therefore, when a high frequency noise signal enters the power amplifier stage, a zero signal is input so that no noise is generated in the speaker.
그러나 헤드(HEAD)에 음악신호가 들어오면 이퀄라이즈 앰프(EQ)를 통하여 제 2 도(A)와 같이 음성부분이 톤앰프(TA)와 저역통과필터(LPF)로 입력된다.However, when a music signal is input to the head HEAD, the voice portion is input to the tone amplifier TA and the low pass filter LPF through the equalizing amplifier EQ as shown in FIG.
상기 저역통과필터(LPF)를 통과한 음성신호가 (B)와 같이 출력되어 증폭회로(AMP)에서 증폭하여 다이오드(D₁), 캐패시터(C₁), 저항(R₁)의 구성 검파회로의 출력으로 (C)와 같이 출력된다. 이 신호가 입력저항(R₂)을 거쳐 연산증폭기(OP)의 비반전단(+)으로 입력되어 가변저항(VR₁)의 조정에 따라 설정된 기준값과 음성신호를 비교하게 된다. 이때 연산증폭기(OP)의 출력이 "하이"가 되어 트랜지스터(TR₁)의 베이스에 입력될때 트랜지스터(TR₁)를 온하므로 트랜지스터(TR₂)의 베이스는 "로우"가 되어 트랜지스터(TR₂)는 오프된다.The voice signal passing through the low pass filter (LPF) is output as shown in (B) and amplified by the amplifier circuit (AMP) to the output of the component detection circuit of the diode (D₁), capacitor (C₁), and resistor (R₁) ( Is output as in C). This signal is input to the non-inverting terminal (+) of the operational amplifier OP via the input resistance R2 and compares the audio signal with the reference value set according to the adjustment of the variable resistor VR '. At this time, when the output of the operational amplifier OP becomes "high" and is input to the base of the transistor TR ', the transistor TR' is turned on, so the base of the transistor TR2 is "low" and the transistor TR2 is turned off.
그러므로 톤앰프(TA)를 통과한 음성신호가 파우워 앰프를 통하여 스피커를 구동하므로 음신호만 출력시킬 수 있다.Therefore, since the voice signal passing through the tone amplifier TA drives the speaker through the power amplifier, only the sound signal can be output.
상술한 바와같이 테이프의 공란 고주파 성분의 노이즈를 톤 단뒤에서 완전히 제거하여 깨끗한 음질을 얻을 수 있는 이점이 있다.As described above, the noise of the blank high frequency component of the tape is completely removed after the tone stage, thereby providing a clear sound quality.
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Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019870004289U KR900008896Y1 (en) | 1987-03-31 | 1987-03-31 | Noise reduction circuit for the tape of part without signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019870004289U KR900008896Y1 (en) | 1987-03-31 | 1987-03-31 | Noise reduction circuit for the tape of part without signal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR880018563U KR880018563U (en) | 1988-10-29 |
| KR900008896Y1 true KR900008896Y1 (en) | 1990-09-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR2019870004289U KR900008896Y1 (en) | 1987-03-31 | 1987-03-31 | Noise reduction circuit for the tape of part without signal |
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| Country | Link |
|---|---|
| KR (1) | KR900008896Y1 (en) |
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1987
- 1987-03-31 KR KR2019870004289U patent/KR900008896Y1/en not_active IP Right Cessation
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| Publication number | Publication date |
|---|---|
| KR880018563U (en) | 1988-10-29 |
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