CN107182006B - Sound control circuit for microphone of sound box - Google Patents
Sound control circuit for microphone of sound box Download PDFInfo
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- CN107182006B CN107182006B CN201710531996.2A CN201710531996A CN107182006B CN 107182006 B CN107182006 B CN 107182006B CN 201710531996 A CN201710531996 A CN 201710531996A CN 107182006 B CN107182006 B CN 107182006B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2430/00—Signal processing covered by H04R, not provided for in its groups
- H04R2430/01—Aspects of volume control, not necessarily automatic, in sound systems
Abstract
The invention belongs to the technical field of sound control electronics, and provides a sound control circuit for a loudspeaker and a microphone of a sound box, which comprises: the device comprises a wired microphone signal input processing module, a wireless microphone signal input processing module, a sound signal adjusting module, a sound signal amplifying module, a sound signal reverberation module and a reverberation echo control module. The invention has the advantages that the processed sound is more exquisite, the recognition degree is higher, the sound can more clearly enter the ear, the sound effect adjusted by the invention can have multiple auditory effects, the sound effect can be changed according to the requirement, the distortion and the loss of the sound signal in the amplifying process are reduced after the input sound signal is processed, the distortion rate of the sound power is reduced after the sound power is effectively amplified, the design of the circuit ensures that the distortion in the sound reverberation adjusting process is less, and the sound quality is improved.
Description
Technical Field
The invention belongs to the technical field of sound control electronics, and particularly relates to a sound control circuit for a loudspeaker and a microphone of a sound box.
Background
In the sound box equipment which is developed rapidly nowadays, the requirement for the sound box equipment is higher and higher, the functions of the sound box are required to be more and more, and meanwhile, the sound quality played by the sound box is also required to have higher requirements. In the existing sound box device, the sound box often does not have the input function of a microphone and the input function of an external device such as a DVD. In order to eliminate the functional deficiency, the sound quality of many sound boxes is not required nowadays, which is caused by various reasons, such as unstable input voltage, especially after the microphone is added, the reverberation processing circuit of the sound box sound does not process the interference signal in the circuit or does not perform filtering processing, and it is necessary to design a sound box microphone sound control circuit which is stable, has no distortion in output signal and can process various input signals.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a sound control circuit of a loudspeaker box and a microphone, which is stable, does not distort an output signal and can process various input signals, aiming at the current situation of the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a loudspeaker microphone sound control circuit which characterized in that includes following module:
the system comprises a wired microphone signal input processing module, a wired microphone signal output processing module and a wired microphone signal output processing module, wherein the wired microphone signal input processing module is used for receiving and processing sound signals input by a wired microphone and processing the sound signals;
the wireless microphone signal input processing module is used for receiving and processing a sound signal input by a wireless microphone;
the wired microphone signal input processing module and the wireless microphone signal input processing module are electrically connected to the sound signal adjusting module together with the sound signal adjusting module, and the sound signal adjusting module is used for carrying out frequency modulation filtering on sound signals;
the sound signal amplifying module is electrically connected to the sound signal adjusting module and is used for amplifying the sound signal subjected to frequency modulation and filtering;
the sound signal reverberation module is electrically connected with the sound signal amplification module and is used for carrying out reverberation processing on the sound signal;
and the reverberation echo control module is electrically connected between the sound signal amplification module and the sound signal reverberation module and is used for controlling the echo of the sound signal.
The measures taken for optimizing the above scheme specifically include:
in the above sound control circuit for speakers and microphones, the wired microphone signal input processing module includes a wired input interface J2, a resistor R49, a capacitor C48 and a transistor Q5, the wireless microphone signal input processing module includes a wireless input interface CN7, a resistor R50, a capacitor C49, a resistor R49 and a resistor R49, a 4 th pin of the wired input interface J49 is electrically connected to the resistor R49 and the capacitor C49, the resistor R49 is connected in series with the capacitor C49, a first pin of the wireless input interface CN 49 is electrically connected to the resistor R49 and the capacitor C49, the resistor R49 and the capacitor C49 are connected in series with each other, the resistor R49 and the resistor R49 are connected in series with the resistor R49, a 2 nd pin of the wireless input interface CN 49 is electrically connected between the resistor R49, the resistor R49 and the base of the transistor Q49, the emitter terminal of the transistor Q5 is grounded, the resistor R49 is electrically connected to the collector terminal of the transistor Q5 after being connected in series with the capacitor C48, and the resistor R50 and the capacitor C49 are also electrically connected to the collector terminal of the transistor Q5 after being connected in series with each other.
In the above sound control circuit for a speaker microphone, the sound signal adjusting module includes an adjusting resistor VR2, a capacitor C56 and a resistor R75, a common output terminal of the resistor R49, the capacitor C48, the resistor R50 and the capacitor C49 is electrically connected to the adjusting resistor VR2, and the adjusting resistor VR2 is electrically connected to the capacitor C56 and the resistor R75 in sequence.
In the sound control circuit for the speaker microphone, the sound signal amplification module includes an operational amplifier U9B, a resistor R74, a capacitor C55, a capacitor C57, a resistor R76, an operational amplifier U9A, a resistor R79, a capacitor C62, a capacitor C59, a resistor R80 and a capacitor C60, the resistor R74 and the capacitor C55 are connected in parallel and then electrically connected to the 6 th pin and the 7 th pin of the operational amplifier U9B, the capacitor C57 and the resistor R76 are connected in series and then electrically connected to the 7 th pin of the operational amplifier U9B, the resistor R79 and the capacitor C62 are connected in parallel and then electrically connected to the 2 nd pin and the 1 st pin of the operational amplifier U9A, the 3 rd pin of the operational amplifier U9A is electrically connected to the 5 th pin of the operational amplifier U9B, and the capacitor C59, the resistor R80 and the capacitor C60 are connected in series and then electrically connected to the 1 st pin of the operational amplifier U9A.
In the sound control circuit for the speaker microphone, the 5 th pin of the operational amplifier U9B and the 3 rd pin of the operational amplifier U9A are further electrically connected with a rear amplification matching module, the amplification matching module includes a resistor R54, a resistor R51, a resistor R78, a resistor R77 and a capacitor C58, the resistor R54 is sequentially connected in series with the resistor R51, the capacitor C58, the resistor R78 and the resistor R77 and then is input to the 5 th pin of the operational amplifier U9B and the 3 rd pin of the operational amplifier U9A, one end of the capacitor C58 is grounded, and one end of the resistor R54 is connected with a voltage of 5V.
In the above sound control circuit for a speaker microphone, the reverberation echo control module includes a resistor R59, a capacitor C50, a transistor Q6, a resistor R58, a capacitor C61 and a resistor R81, one end of the resistor R59 is connected to a 5V voltage, the other end is connected to a base of the transistor Q6, one end of the capacitor C50 is respectively electrically connected to bases of the resistor R59 and the transistor Q6, the other end of the capacitor C50 is grounded, an emitter of the base of the transistor Q6 is grounded, a collector of the transistor Q6 is sequentially and electrically connected in series to the resistor R58, the capacitor C61 and the resistor R81, and the resistor R81 is electrically connected to the 2 nd pin of the operational amplifier U9A.
In the sound control circuit for the speaker microphone, the sound signal reverberation module includes a resistor R90, a capacitor C64, a resistor R92, a capacitor C78, a resistor R91, a resistor 93, a capacitor C80, a capacitor C792, and an adjustable resistor VR3, the resistor R90, the capacitor C78, and the resistor R91 are sequentially connected in series and then electrically connected to the adjustable resistor VR3, the resistor R92 is connected in parallel with the resistor R90, the capacitor C64 is electrically connected between the resistor R92 and the resistor R90, the resistor R76 is electrically connected to the resistor R92, the resistor R90, and the resistor R91, the resistor 93 is electrically connected to the adjustable resistor VR3 after being connected in series with the capacitor C792, and the capacitor C80 is electrically connected between the resistor 93 and the capacitor C792.
In the above sound control circuit for a speaker microphone, the sound signal reverberation module and the reverberation echo control module are electrically connected to a main control chip U10, the resistor R90 and the resistor R91 are electrically connected to a 16 th pin and a 15 th pin of the main control chip U10, the resistor 93 is electrically connected to a 14 th pin of the main control chip U10, a common output end of the 16 th pin and the 15 th pin of the main control chip U10 is connected in series to a capacitor C63 and a resistor R82, and the resistor R82 is electrically connected to a collector of the resistor R58 and the transistor Q6.
Compared with the prior art, the invention has the advantages that the processed sound is more exquisite, the recognition degree is higher, the sound can enter the ear more clearly, the sound effect adjusted by the invention has a multiple hearing effect, the sound effect can be changed according to the requirement, the distortion and the loss of the sound signal in the amplification process are reduced after the input sound signal is processed, the distortion rate of the sound power is reduced after the sound power is effectively amplified, the design of the circuit ensures that the distortion in the sound reverberation adjustment process is less, and the sound quality is improved.
Drawings
Fig. 1 is a schematic diagram of the sound control circuit of the speaker microphone.
Detailed Description
The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.
In the figure, a wired microphone signal is input into a processing module 1; the wireless microphone signal inputs the processing module 2; a sound signal conditioning module 3; a sound signal amplifying module 4; a sound signal reverberation module 5; a reverberation echo control module 6; and an amplification matching module 7.
As shown in fig. 1, the sound control circuit for a speaker microphone of a sound box comprises a wired microphone signal input processing module 1, a wireless microphone signal input processing module 2, a sound signal adjusting module 3, a sound signal amplifying module 4, a sound signal reverberation module 5, a reverberation echo control module 6 and a main control chip U10, wherein the wired microphone signal input processing module 1 is used for receiving and processing a sound signal input by a wired microphone, the wireless microphone signal input processing module 2 is used for receiving and processing a sound signal input by a wireless microphone, the wired microphone signal input processing module 1 and the wireless microphone signal input processing module 2 are both electrically connected to the sound signal adjusting module 3 with the sound signal adjusting module 3, the sound signal adjusting module 3 is used for performing frequency modulation filtering on the sound signal, the sound signal amplifying module 4 is electrically connected to the sound signal adjusting module 3 and is used for performing frequency modulation filtering on the sound signal after frequency modulation filtering And in the amplification processing, the sound signal reverberation module 5 is electrically connected with the sound signal amplification module 4 and used for performing reverberation processing on the sound signal, the reverberation echo control module 6 is electrically connected between the sound signal amplification module 4 and the sound signal reverberation module 5 and used for controlling the echo of the sound signal, and both the sound signal reverberation module 5 and the reverberation echo control module 6 are electrically connected with the main control chip U10.
Specifically, the wired microphone signal input processing module 1 comprises a wired input interface J, a resistor R, a capacitor C and a triode Q, the wireless microphone signal input processing module 2 comprises a wireless input interface CN, a resistor R, a capacitor C, a resistor R and a resistor R, the 4 th pin of the wired input interface J is electrically connected with the resistor R and the capacitor C, the resistor R is connected with the capacitor C in series, the first pin of the wireless input interface CN is electrically connected with the resistor R and the capacitor C, the resistor R and the capacitor C are mutually connected in series, the resistor R and the resistor R are connected with each other in series and then are connected with the resistor R in series, the 2 nd pin of the wireless input interface CN is electrically connected among the resistor R, the resistor R and the resistor R, the resistor R is respectively and electrically connected with the resistor R and the base electrode of the triode Q, the emitter end of the triode Q is grounded, the resistor R is electrically connected with the collector electrode of the, the resistor R50 and the capacitor C49 are connected in series with each other and also electrically connected to the collector of the triode Q5, wherein the base of the triode Q6 is electrically connected to the 1 st pin of the line input interface J2, wherein the low-frequency and high-frequency impedance matching function can be performed on the wired input voice signal through the resistor R49 and the capacitor C48, and simultaneously the resistor R50 and the capacitor C49 are connected in series with each other and can perform the low-frequency and high-frequency impedance matching function on the wireless input voice signal, and the influence of the bias current of the microphone is isolated through the capacitor C49 and the capacitor C48, and because the collector of the triode Q6 is the 1 st pin of the J2, which is used as the related signal of the reverberation echo control module 6, when the base of the triode Q5 is turned on, the triode Q5 sends a signal to the reverberation echo control module 6 through the collector, and the reverberation echo control module 6 performs the inverse control on the voice, so that the processed voice is, the discernment degree is higher, and more clear income ear, the audio can have multiple hearing effect, can change the audio as required.
The sound signal adjusting module 3 comprises an adjusting resistor VR2, a capacitor C2 and a resistor R2, common output terminals of the resistor R2, the capacitor C2, the resistor R2 and the capacitor C2 are electrically connected to the adjusting resistor VR2, the adjusting resistor VR2 is electrically connected with the capacitor C2 and the resistor R2 in turn, when the resistance value of the adjusting resistor VR2 changes, the loudness of the sound component can be changed by the adjusting resistor VR2, the sound signal amplifying module 4 comprises an operational amplifier U9 2, a resistor R2, a capacitor C2, a resistor R2, an operational amplifier U9 2, a resistor R2, a capacitor C2, a resistor R2 and a capacitor C2, the resistor R2 and the capacitor C2 are connected in parallel, then the capacitor C2 and the operational amplifier U7 are electrically connected in parallel, the capacitor C2 and the operational amplifier U2 are electrically connected in parallel, the pin 3 of the operational amplifier U9A is electrically connected with the pin 5 of the operational amplifier U9B, the capacitor C59, the resistor R80 and the capacitor C60 are connected in series and then electrically connected with the pin 1 of the operational amplifier U9A, wherein the sound signal is converted into an electrical signal, the electrical signal passes through a two-stage amplifying circuit passing through the operational amplifier U9A and the operational amplifier U9B, the pin 5 of the operational amplifier U9B and the pin 3 of the operational amplifier U9A are also electrically connected with the post-amplifying matching module 7, the amplifying matching module 7 comprises a resistor R54, a resistor R51, a resistor R78, a resistor R77 and a capacitor C58, the resistor R54 is sequentially connected with the resistor R51, the capacitor C58, the resistor R78 and the resistor R77 and then is input to the pin 5 of the operational amplifier U9B and the pin 3 of the operational amplifier U9A, one end of the capacitor C58 is grounded, one end of the resistor R54 is connected with a voltage of 5V, and here, whether the electrical signal can, if the overload is detected, an overload indication is sent out, the overload electric signal is compensated, and if the overload is not detected, the intensity of the electric signal is improved or attenuated through the amplification matching module 7.
The reverberation echo control module 6 comprises a resistor R59, a capacitor C50, a triode Q6, a resistor R58, a capacitor C61 and a resistor R81, wherein one end of the resistor R59 is connected with 5V voltage, the other end of the resistor R59 is connected with the base of the triode Q6, one end of the capacitor C50 is respectively and electrically connected with the resistor R59 and the base of the triode Q6, the other end of the capacitor C50 is grounded, the emitter of the base of the triode Q6 is grounded, the collector of the triode Q6 is sequentially and electrically connected with a resistor R58, a capacitor C61 and a resistor R81 in series, the resistor R81 is electrically connected with the 2 nd pin of an operational amplifier U9A, the sound signal reverberation module 5 and the reverberation echo control module 6 are both electrically connected with a main control chip U A, the resistor R A and the resistor R A are respectively and electrically connected with the 16 th pin and the 15 th pin of the main control chip U A, the resistor 93 is electrically connected with the 14 th pin of the chip U A, the, the resistor R82 is electrically connected with the resistor R58 and the collector of the triode Q6, wherein the reverberation echo control module 6 is used as a related signal of a sound signal on one hand and is input into the operational amplifier U9B for secondary amplification on the other hand, and the reverberation echo control module further reduces distortion and loss of power in the amplification process through independent amplification of voltage and current.
The sound signal reverberation module 5 comprises a resistor R90, a capacitor C64, a resistor R92, a capacitor C78, a resistor R91, a resistor 93, a capacitor C80, a capacitor C792 and an adjustable resistor VR3, wherein the resistor R90, the capacitor C78 and the resistor R91 are sequentially connected in series and then electrically connected to the adjustable resistor VR3, the resistor R92 is connected in parallel with the resistor R90, the capacitor C64 is electrically connected between the resistor R92 and the resistor R90, the resistor R76 is respectively electrically connected with the resistor R92, the resistor R90 and the resistor R91, the resistor 93 and the capacitor C792 are electrically connected in series and then electrically connected to the adjustable resistor VR3, the capacitor C80 is electrically connected between the resistor 93 and the capacitor C792, and the echo time is controlled by the resistance value of the adjustable resistor VR3, the larger the echo time is, and the longer the echo time is.
The sound effect after the reverberation and echo processing has multiple auditory effects, the sound effect can be changed as required, the input sound signal is processed, the distortion and the loss of the sound signal in the amplification process are reduced, the distortion rate of the sound power is reduced after the sound power is effectively amplified, the distortion in the sound reverberation adjustment process is reduced due to the design of the circuit, and the sound quality is improved.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the described embodiments may be made by those skilled in the art without departing from the scope and spirit of the invention as defined by the accompanying claims.
Claims (6)
1. The utility model provides a loudspeaker microphone sound control circuit which characterized in that includes following module:
the system comprises a wired microphone signal input processing module, a wired microphone signal output processing module and a wired microphone signal output processing module, wherein the wired microphone signal input processing module is used for receiving and processing sound signals input by a wired microphone and processing the sound signals;
the wireless microphone signal input processing module is used for receiving and processing a sound signal input by a wireless microphone;
the wired microphone signal input processing module comprises a wired input interface J, a resistor R, a capacitor C and a triode Q, the wireless microphone signal input processing module comprises a wireless input interface CN, a resistor R, a capacitor C, a resistor R and a resistor R, the 4 th pin of the wired input interface J is electrically connected with the resistor R and the capacitor C, the resistor R is connected with the capacitor C in series, the first pin of the wireless input interface CN is electrically connected with the resistor R and the capacitor C, the resistor R and the capacitor C are mutually connected in series, the resistor R and the resistor R are connected in series after being connected in parallel, the 2 nd pin of the wireless input interface CN is electrically connected among the resistor R, the resistor R and the resistor R, the resistor R is respectively and electrically connected with the base electrode of the triode Q, the emitter end of the triode Q is grounded, the resistor R and the capacitor C are electrically connected with the collector electrode of the triode Q after being connected in series, the resistor R50 and the capacitor C49 are mutually connected in series and are also electrically connected to the collector of the triode Q5, and the collector of the triode Q5 is electrically connected with the 1 st pin of the wired input interface J2;
the wired microphone signal input processing module and the wireless microphone signal input processing module are both electrically connected with the sound signal adjusting module, and the sound signal adjusting module is used for carrying out frequency modulation filtering on sound signals;
the sound signal amplifying module is electrically connected to the sound signal adjusting module and is used for amplifying the sound signal subjected to frequency modulation and filtering;
the sound signal reverberation module is electrically connected with the sound signal amplification module and is used for carrying out reverberation processing on the sound signal;
the reverberation echo control module is electrically connected between the sound signal amplification module and the sound signal reverberation module and is used for controlling the echo of the sound signal;
the reverberation echo control module comprises a resistor R59, a capacitor C50, a triode Q6, a resistor R58, a capacitor C61 and a resistor R81, wherein one end of the resistor R59 is connected with 5V voltage, the other end of the resistor R59 is connected with the base of the triode Q6, one end of the capacitor C50 is respectively and electrically connected with the bases of a resistor R59 and a triode Q6, the other end of the capacitor C50 is grounded, the emitter of the base of the triode Q6 is grounded, the collector of the triode Q6 is sequentially and electrically connected with the resistor R58, the capacitor C61 and the resistor R81 in series, the resistor R81 is electrically connected with the 2 nd pin of an operational amplifier U9A, and the base of the triode Q6 is electrically connected with the 1 st pin of a wired input interface J.
2. The sound control circuit of a speaker microphone of claim 1, wherein the sound signal adjusting module comprises an adjusting resistor VR2, a capacitor C56 and a resistor R75, a common output terminal of the resistor R49, the capacitor C48, the resistor R50 and the capacitor C49 is electrically connected to the adjusting resistor VR2, and the adjusting resistor VR2 is electrically connected to the capacitor C56 and the resistor R75 in turn.
3. The sound control circuit of a speaker microphone according to claim 2, wherein the sound signal amplifying module comprises an operational amplifier U9B, a resistor R74, a capacitor C55, a capacitor C57, a resistor R76, an operational amplifier U9A, a resistor R79, a capacitor C62, a capacitor C59, a resistor R80 and a capacitor C60, the resistor R74 and the capacitor C55 are connected in parallel and then electrically connected to the 6 th pin and the 7 th pin of the operational amplifier U9B, the capacitor C57 and the resistor R76 are connected in series and then electrically connected to the 7 th pin of the operational amplifier U9B, the resistor R79 and the capacitor C62 are connected in parallel and then electrically connected to the 2 nd pin and the 1 st pin of the operational amplifier U9A, the 3 rd pin of the operational amplifier U9A is electrically connected to the 5 th pin of the operational amplifier U9B, and the capacitor C59, the resistor R80 and the capacitor C60 are connected in series and then electrically connected to the 1 st pin of the operational amplifier U9A.
4. The sound control circuit of a speaker microphone according to claim 3, wherein the 5 th pin of the operational amplifier U9B and the 3 rd pin of the operational amplifier U9A are further electrically connected with a rear amplification matching module, the amplification matching module includes a resistor R54, a resistor R51, a resistor R78, a resistor R77 and a capacitor C58, the resistor R54 is sequentially connected in series with a resistor R51, a capacitor C58, a resistor R78 and a resistor R77 and then is input to the 5 th pin of the operational amplifier U9B and the 3 rd pin of the operational amplifier U9A, one end of the capacitor C58 is grounded, and one end of the resistor R54 is connected to a voltage of 5V.
5. The sound control circuit of a speaker microphone of claim 1, wherein the sound signal reverberation module comprises a resistor R90, a capacitor C64, a resistor R92, a capacitor C78, a resistor R91, a resistor 93, a capacitor C80, a capacitor C792, and an adjustable resistor VR3, the resistor R90, the capacitor C78, and the resistor R91 are sequentially connected in series and then electrically connected to the adjustable resistor VR3, the resistor R92 is connected in parallel with the resistor R90, the capacitor C64 is electrically connected between the resistor R92 and the resistor R90, the resistor R76 is electrically connected to the resistor R92, the resistor R90, and the resistor R91 respectively, the resistor 93 is electrically connected to the adjustable resistor VR3 after being connected in series with the capacitor C792, and the capacitor C80 is electrically connected between the resistor 93 and the capacitor C792.
6. The sound control circuit of a speaker microphone according to claim 5, wherein the sound signal reverberation module and the reverberation echo control module are electrically connected to a main control chip U10, the resistor R90 and the resistor R91 are electrically connected to a 16 th pin and a 15 th pin of the main control chip U10, respectively, the resistor 93 is electrically connected to a 14 th pin of the main control chip U10, a common output terminal of the 16 th pin and the 15 th pin of the main control chip U10 is connected in series to a capacitor C63 and a resistor R82, and the resistor R82 is electrically connected to a resistor R58 and a collector of the transistor Q6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710531996.2A CN107182006B (en) | 2017-07-03 | 2017-07-03 | Sound control circuit for microphone of sound box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710531996.2A CN107182006B (en) | 2017-07-03 | 2017-07-03 | Sound control circuit for microphone of sound box |
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| CN107182006A CN107182006A (en) | 2017-09-19 |
| CN107182006B true CN107182006B (en) | 2019-12-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710531996.2A Active CN107182006B (en) | 2017-07-03 | 2017-07-03 | Sound control circuit for microphone of sound box |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108650586B (en) * | 2018-06-29 | 2023-08-15 | 河南中多科技发展有限公司 | High-sensitivity microphone sound code telephone circuit |
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| JPH03210899A (en) * | 1990-01-16 | 1991-09-13 | Fujitsu Ten Ltd | Sound field controller |
| JPH04174900A (en) * | 1990-11-08 | 1992-06-23 | Nippon Columbia Co Ltd | Reverberation adding device |
| CN204906688U (en) * | 2015-09-23 | 2015-12-23 | 宁波中荣声学科技有限公司 | Simulation effect ware |
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| CN2203810Y (en) * | 1994-04-01 | 1995-07-19 | 王剑秋 | Multi-function pocket karaok machine |
| CN2342518Y (en) * | 1998-07-28 | 1999-10-06 | 李锡放 | Preamplifier for kara OK microphone |
| CN102196337A (en) * | 2011-05-25 | 2011-09-21 | 广州市森谱电子科技有限公司 | Intelligent digital sound system equipment |
| CN203870967U (en) * | 2014-04-30 | 2014-10-08 | 郭建 | Outdoor karaoke system |
| CN204069346U (en) * | 2014-08-31 | 2014-12-31 | 杨湘南 | The ANTENN AUDIO Play System of square dance noise can be solved |
| CN105472506A (en) * | 2015-11-24 | 2016-04-06 | 宁波柏人艾电子有限公司 | Microphone circuit audio control circuit |
| CN105357611A (en) * | 2015-11-26 | 2016-02-24 | 宁波柏人艾电子有限公司 | Audio pre-amplification circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03210899A (en) * | 1990-01-16 | 1991-09-13 | Fujitsu Ten Ltd | Sound field controller |
| JPH04174900A (en) * | 1990-11-08 | 1992-06-23 | Nippon Columbia Co Ltd | Reverberation adding device |
| CN204906688U (en) * | 2015-09-23 | 2015-12-23 | 宁波中荣声学科技有限公司 | Simulation effect ware |
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| CN107182006A (en) | 2017-09-19 |
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