CN101394154B - Automatic gain dual channel audio pre-amplifier - Google Patents
Automatic gain dual channel audio pre-amplifier Download PDFInfo
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- CN101394154B CN101394154B CN2008101552437A CN200810155243A CN101394154B CN 101394154 B CN101394154 B CN 101394154B CN 2008101552437 A CN2008101552437 A CN 2008101552437A CN 200810155243 A CN200810155243 A CN 200810155243A CN 101394154 B CN101394154 B CN 101394154B
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Abstract
The invention discloses a head amplifier of audio frequency which can automatically gain and has two similar independent transmission channels. Each transmission channel comprises a differential operational amplifier INA133; an audio frequency signal is input to the differential operational amplifier INA133 for differential amplification and is divided into two paths, one path enters a main amplification stage of an amplifier INA2332 used by a CMOS device, the other path enters a peak holding state and an LED driving circuit to drive a light emitting diode to irradiate a light dependent resistor which is connected in series in a gain controlling network of the main amplifier stage of the INA2332 of the other transmission channel to control the gain of the other channel; the gain controlling network is connected with the main amplifier stage of the amplifier INA2332 used by the CMOS device; the main amplifier stage of the amplifier INA2332 used by the CMOS device is connected with an output stage circuit; the output stage circuit outputs a differential signal so as to provide the follow-up stage recording or sound reinforcement. The invention has the advantages of reasonable structure, high reliability, and convenient operation. Furthermore, the invention can automatically match sound volume of each voice part, thereby simplifying the tuning, and saving much manpower and physical resources.
Description
Technical field:
The present invention relates to a kind of automatic gain dual channel audio pre-amplifier.
Background technology:
Under occasions such as recording, meeting, performance, owing to different performance microphone or sound source cause importing the inconsistent of volume, make us need to come each part of balance in conjunction with the gain of the sense of hearing by the manual adjustment preamplifier, to satisfy the needs of volume coupling, troublesome poeration so not only, make mistakes easily, and the volume control precision is low.
Summary of the invention:
The object of the present invention is to provide a kind of rational in infrastructurely, reliability height, easy to operate can mate each part volume automatically, thereby simplifies tuning, has saved the automatic gain dual channel audio pre-amplifier of lot of manpower and material resources.
Technical solution of the present invention is:
A kind of automatic gain dual channel audio pre-amplifier, it is characterized in that: two identical independent transmission passages are arranged, each transmission channel comprises a differential operational amplifier INA133, audio signal input difference operational amplifier INA133 difference is divided into two-way after amplifying, one the tunnel enters CMOS instrumentation amplifier INA2332 master amplifying stage, another road enters peak value and keeps and led drive circuit, driven for emitting lights diode irradiation photo resistance, this photo resistance is serially connected in the gain controlling network of INA2332 master's amplifying stage of another transmission channel, controls the gain of another passage; The gain controlling network is connected with CMOS instrumentation amplifier INA2332 master amplifying stage, and CMOS instrumentation amplifier INA2332 master amplifying stage is connected with output-stage circuit, is recorded or public address for the back level by output-stage circuit output differential signal.
Voltage follower and inverter that output-stage circuit uses OPA2335 to constitute.
Peak value keeps and led drive circuit comprises TL072 operational amplifier U
1, U
2, U
3, U
4, U
1The output that amplifies INA133 from calculus of differences obtains audio signal, amplifies back input U
2In-phase end, U
2End of oppisite phase be connected on the diode 1N4148 by resistance, a negative tube voltage drop is provided, make the diode 1N4148 lightly conducting of output, U
2The diode 1N4148 and the U of output
3Connect U
3In-phase input end RC network in parallel over the ground and U
4The circuit that constitutes, U
3Driving LED is luminous.
Output-stage circuit comprises the voltage follower of two input parallel connections, one of them voltage follower is directly by capacitive coupling output in-phase signal, another voltage follower output signal enters the inverter that OPA2335 constitutes, and the output inversion signal is exported by capacitive coupling.
The automatic volume terminated line of inside of the present invention, it is unbalance farthest to eliminate volume.It can import weak audio signals such as two-way microphone, electromagnetic pick-up, possesses difference, single-ended input/output interface.Signal after volume coupling and amplification is exported to sound card, recorder or sound console, for the back level public address at recording or meeting, performance scene etc.This function has brought maximum convenience and consistency for stereo pickup, public address.The present invention is rational in infrastructure, and reliability height, easy to operate can mate each part volume automatically, thereby simplifies tuning, has saved lot of manpower and material resources.
Description of drawings:
The invention will be further described below in conjunction with drawings and Examples.
Fig. 1 is the configuration diagram of one embodiment of the invention.
Fig. 2 is input stage circuit figure.
Fig. 3 is that peak value keeps and led drive circuit figure.
Fig. 4 is main amplification grade circuit figure.
Fig. 5 is output-stage circuit figure.
Embodiment:
A kind of automatic gain dual channel audio pre-amplifier, two identical independent transmission passages 1 are arranged, 2, each transmission channel comprises a differential operational amplifier (INA133) 3, audio signal input difference operational amplifier INA133 difference is divided into two-way after amplifying, one the tunnel enters CMOS instrumentation amplifier (INA2332) 4 main amplifying stages, another road enters peak value and keeps and led drive circuit 5, the 6 irradiation photo resistance 7 of driven for emitting lights diode, this photo resistance 7 is serially connected in the gain controlling network 8 of INA2332 master's amplifying stage of another transmission channel, controls the gain of another passage; Gain controlling network 8 is connected with CMOS instrumentation amplifier INA2332 master amplifying stage, and CMOS instrumentation amplifier INA2332 master amplifying stage is connected with output-stage circuit 9, is recorded or public address for the back level by output-stage circuit 9 output differential signals.Voltage follower and inverter that output-stage circuit uses OPA2335 to constitute, output-stage circuit comprises the voltage follower of two input parallel connections, one of them voltage follower is directly by capacitive coupling output in-phase signal, another voltage follower output signal enters the inverter that OPA2335 constitutes, the output inversion signal is exported by capacitive coupling.Because OPA2335 is single 5V power supply power supply, so resting potential is biased to 2.5V, to obtain maximum alternating voltage dynamic range.
Peak value keeps and led drive circuit comprises TL072 operational amplifier U
1, U
2, U
3, U
4, U
1The output that amplifies INA133 from calculus of differences obtains audio signal, amplifies back input U
2In-phase end, U
2End of oppisite phase be connected on the diode 1N4148 by resistance, a negative tube voltage drop is provided, make the diode 1N4148 lightly conducting of output, U
2The diode 1N4148 and the U of output
3Connect U
3In-phase input end RC network in parallel over the ground and U
4The circuit that constitutes, U
3Driving LED is luminous, adopts Current Control.
Input stage of the present invention adopts INA133, and it is one and has high speed, high-precision differential operational amplifier, bandwidth: 1.5MHz; Switching rate: 5V/ μ
SPower supply voltage range: ± 2.25V arrives ± 18V; Inside has the resistor network of coupling, and common-mode rejection ratio is up to 90dB.Adopted the inner negative feedback resistor network of this IC in the design, designed like this circuit has precision height, common-mode rejection ratio advantages of higher, is fit to the differential signal input.
Main amplification grade circuit has adopted INA2332, and it is a single supply, low-power consumption, high-precision CMOS instrumentation amplifier, and it has the bandwidth of 2.0MHz, 5V/ μ
SSwitching rate, be particularly suitable for audio frequency and amplify.In a passage of this amplifier, R1 is a photo resistance of being shone by another channel peak holding circuit driving LED, and the R2 of two passages is subjected to a duplex potentiometer Synchronization Control, with the gain of the common decision-making circuit of photo resistance.
Claims (3)
1. automatic gain dual channel audio pre-amplifier, it is characterized in that: two identical independent transmission passages are arranged, each transmission channel comprises a differential operational amplifier INA133, audio signal input difference operational amplifier INA133 difference is divided into two-way after amplifying, one the tunnel enters CMOS instrumentation amplifier INA2332 master amplifying stage, another road enters peak value and keeps and led drive circuit, driven for emitting lights diode irradiation photo resistance, this photo resistance is serially connected in the gain controlling network of INA2332 master's amplifying stage of another transmission channel, controls the gain of another passage; The gain controlling network is connected with CMOS instrumentation amplifier INA2332 master amplifying stage, and CMOS instrumentation amplifier INA2332 master amplifying stage is connected with output-stage circuit, is recorded or public address for the back level by output-stage circuit output differential signal; Peak value keeps and led drive circuit comprises a TL072 operational amplifier, the 2nd TL072 operational amplifier, the 3rd TL072 operational amplifier, the 4th TL072 operational amplifier, the one TL072 operational amplifier obtains audio signal from the output of differential operational amplifier INA133, amplify back input the 2nd TL072 operational amplifier in-phase end, the end of oppisite phase of the 2nd TL072 operational amplifier is connected on the first diode 1N4148 by resistance, a negative tube voltage drop is provided, make the second diode 1N4148 lightly conducting of output, the second diode 1N4148 of the 2nd TL072 operational amplifier output terminal is connected with the 3rd TL072 operational amplifier, the circuit that the 3rd TL072 operational amplifier in-phase input end RC network in parallel over the ground and the 4th TL072 operational amplifier constitute, the 3rd TL072 operational amplifier driving LED is luminous.
2. automatic gain dual channel audio pre-amplifier according to claim 1 is characterized in that: voltage follower and inverter that output-stage circuit uses OPA2335 to constitute.
3. automatic gain dual channel audio pre-amplifier according to claim 2, it is characterized in that: output-stage circuit comprises the voltage follower of two input parallel connections, one of them voltage follower is directly by capacitive coupling output in-phase signal, another voltage follower output signal enters the inverter that OPA2335 constitutes, the output inversion signal is exported by capacitive coupling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101552437A CN101394154B (en) | 2008-10-10 | 2008-10-10 | Automatic gain dual channel audio pre-amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101552437A CN101394154B (en) | 2008-10-10 | 2008-10-10 | Automatic gain dual channel audio pre-amplifier |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101394154A CN101394154A (en) | 2009-03-25 |
| CN101394154B true CN101394154B (en) | 2010-09-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008101552437A Expired - Fee Related CN101394154B (en) | 2008-10-10 | 2008-10-10 | Automatic gain dual channel audio pre-amplifier |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104166533B (en) * | 2014-08-08 | 2017-05-17 | 深圳市九洲电器有限公司 | Audio output method and system |
| CN108809462B (en) * | 2018-05-08 | 2024-01-26 | 江苏师范大学 | Digital sound console with multi-channel sound intensity self-balancing function for stadium |
| CN110967463A (en) * | 2018-09-28 | 2020-04-07 | 东华理工大学 | Cave body excavation model test device |
| CN111901726B (en) * | 2020-07-29 | 2021-12-31 | 广州市迪士普音响科技有限公司 | Automatic silent sound preamplifier system and control method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1990004155A1 (en) * | 1988-10-11 | 1990-04-19 | Georg Diamantidis | Colour detecting electronic system |
| US5157435A (en) * | 1990-09-29 | 1992-10-20 | Samsung Electronics Co., Ltd. | Automatic focusing apparatus for a video camera and the method thereof |
| CN1115890A (en) * | 1995-04-28 | 1996-01-31 | 清华大学 | Signal digitalizing instrument |
| CN1194533A (en) * | 1997-03-10 | 1998-09-30 | 松下电器产业株式会社 | AV amplifier |
-
2008
- 2008-10-10 CN CN2008101552437A patent/CN101394154B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1990004155A1 (en) * | 1988-10-11 | 1990-04-19 | Georg Diamantidis | Colour detecting electronic system |
| US5157435A (en) * | 1990-09-29 | 1992-10-20 | Samsung Electronics Co., Ltd. | Automatic focusing apparatus for a video camera and the method thereof |
| CN1115890A (en) * | 1995-04-28 | 1996-01-31 | 清华大学 | Signal digitalizing instrument |
| CN1194533A (en) * | 1997-03-10 | 1998-09-30 | 松下电器产业株式会社 | AV amplifier |
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|---|---|
| CN101394154A (en) | 2009-03-25 |
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| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Dongguan Corich Electronic Co., Ltd. Assignor: Nantong University Contract record no.: 2011440000272 Denomination of invention: Automatic gain dual channel audio pre-amplifier Granted publication date: 20100929 License type: Exclusive License Open date: 20090325 Record date: 20110401 |
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| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100929 Termination date: 20121010 |