CN219019009U - Analog audio input amplitude limiting circuit for sound equipment - Google Patents

Analog audio input amplitude limiting circuit for sound equipment Download PDF

Info

Publication number
CN219019009U
CN219019009U CN202222701363.0U CN202222701363U CN219019009U CN 219019009 U CN219019009 U CN 219019009U CN 202222701363 U CN202222701363 U CN 202222701363U CN 219019009 U CN219019009 U CN 219019009U
Authority
CN
China
Prior art keywords
input
resistor
unit
diode
audio
Prior art date
Legal status (The legal status 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 status listed.)
Active
Application number
CN202222701363.0U
Other languages
Chinese (zh)
Inventor
王忠恺
杨红
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shenzhen Fenda Technology Co Ltd
Original Assignee
Shenzhen Fenda Technology Co Ltd
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.)
Filing date
Publication date
Application filed by Shenzhen Fenda Technology Co Ltd filed Critical Shenzhen Fenda Technology Co Ltd
Priority to CN202222701363.0U priority Critical patent/CN219019009U/en
Application granted granted Critical
Publication of CN219019009U publication Critical patent/CN219019009U/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Landscapes

  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)

Abstract

The utility model relates to the field of audio circuit design, in particular to an analog audio input amplitude limiting circuit for sound equipment. Through adding audio input limiting circuit, just can solve and bear the audio signal amplitude lower and the not problem of matching of current some novel audio processing chip, under satisfying the limiting condition, under the regulation of not losing audio signal to noise, the input of tolerating the audio signal of large amplitude, circuit structure is simple, input impedance is high, and output impedance is low, makes the preceding and succeeding stages circuit of stereo set product match easily.

Description

Analog audio input amplitude limiting circuit for sound equipment
Technical Field
The utility model relates to the field of audio circuit design, in particular to an analog audio input amplitude limiting circuit for sound equipment.
Background
In the existing sound equipment, when some new audio processing chips are low in withstand power voltage, the input amplitude requirement of analog audio cannot be higher than a specified value, and the risk of damaging the chips is exceeded. In order to meet the limiting condition without losing the signal to noise ratio, an analog audio input limiting circuit for sound is introduced. There is a need to match the lower amplitude of the audio signal that some modern audio processing chips withstand. To meet clipping conditions, and without compromising audio signal-to-noise conditions, the audio output of large amplitude audio electrical signals, such as DVD, TV, can be tolerated.
Disclosure of Invention
In order to solve the problems, the utility model provides the following scheme:
in one aspect, the present utility model provides an analog audio input clipping circuit for a sound, comprising:
the device comprises an input unit, an operational amplification unit, a gain adjusting unit and a limiting value adjusting unit;
the input unit is respectively connected with the operational amplification unit, the gain adjustment unit and the limiting value adjustment unit, receives the input of the first audio signal, and outputs a second audio signal after passing through the operational amplification unit, the gain adjustment unit and the limiting value adjustment unit.
Specifically, the gain adjusting unit includes a resistor R1 and a resistor R2, the 1 st end of the resistor R1 is connected with the 2 nd end of the input unit, the 2 nd end of the resistor R1 is respectively connected with the 1 st end of the resistor R2, the 1 st end of the limiting value adjusting unit and the 2 nd end of the operational amplification unit, and the 2 nd end of the resistor R2 is respectively connected with the 2 nd end of the limiting value adjusting unit and the 1 st end of the operational amplification unit and then outputs a second audio signal.
Specifically, the operational amplifier unit is an operational amplifier, the inverting input end of the operational amplifier is respectively connected with the 2 nd end of the resistor R1, the 1 st end of the limiting value adjusting unit and the 1 st end of the resistor R2, the forward input end is grounded, and the output end is respectively connected with the 2 nd end of the resistor R2 and the 2 nd end of the limiting value adjusting unit and outputs a second audio signal.
Specifically, the input unit includes a capacitor.
Specifically, the limiting value adjusting unit includes a diode D1 and a diode D2, the diode D1 is connected in reverse series with the diode D2, an anode of the diode D1 is connected with the 1 st end of the resistor R2 and an inverting input end of the operational amplifier, a cathode of the diode D1 is connected in series with a cathode of the diode D2, and an anode of the diode D2 is connected with the 2 nd end of the resistor R2 and an output end of the operational amplifier and outputs a second audio signal.
Specifically, the limiting value adjusting unit includes a diode D1 and a diode D2, the diode D1 is connected in anti-parallel with the diode D2, the 1 st end of the limiting value adjusting unit after parallel connection is connected with the 1 st end of the resistor R2 and the inverting input end of the operational amplifier, and the 2 nd end of the limiting value adjusting unit after parallel connection is connected with the 2 nd end of the resistor R2 and the output end of the operational amplifier, and outputs a second audio signal.
In one aspect, the present utility model provides an audio apparatus, including an audio body, an audio source input end, and an audio receiving device, further including:
the audio frequency input limiting circuit, the input of audio frequency input limiting circuit is connected with the sound source input, and the output is connected with audio frequency receiving arrangement, includes: the device comprises an input unit, an operational amplification unit, a gain adjusting unit and a limiting value adjusting unit;
the input unit is respectively connected with the operational amplification unit, the gain adjustment unit and the limiting value adjustment unit, receives the input of the first audio signal, and outputs a second audio signal after passing through the operational amplification unit, the gain adjustment unit and the limiting value adjustment unit.
Specifically, in the audio input limiting circuit, the gain adjusting unit includes a resistor R1 and a resistor R2, the 1 st end of the resistor R1 is connected with the 2 nd end of the input unit, the 2 nd end of the resistor R1 is respectively connected with the 1 st end of the resistor R2, the 1 st end of the limiting value adjusting unit, and the 2 nd end of the operational amplification unit, and the 2 nd end of the resistor R2 is respectively connected with the 2 nd end of the limiting value adjusting unit and the 1 st end of the operational amplification unit, and then outputs a second audio signal.
Specifically, in the audio input limiting circuit, the operational amplifier unit is an operational amplifier, the inverting input end of the operational amplifier is respectively connected with the 2 nd end of the resistor R1, the 1 st end of the limiting value adjusting unit and the 1 st end of the resistor R2, the forward input end is grounded, and the output end is respectively connected with the 2 nd end of the resistor R2 and the 2 nd end of the limiting value adjusting unit and outputs a second audio signal.
Specifically, in the audio input clipping circuit, the clipping value adjusting unit includes a diode D1 and a diode D2, the diode D1 is connected in reverse series with the diode D2, an anode of the diode D1 is connected with the 1 st end of the resistor R2 and an inverting input end of the operational amplifier, a cathode of the diode D1 is connected in series with a cathode of the diode D2, and an anode of the diode D2 is connected with the 2 nd end of the resistor R2 and an output end of the operational amplifier and outputs a second audio signal.
Through adding audio input limiting circuit, just can solve and bear the audio signal amplitude lower and the not problem of matching of current some novel audio processing chip, under satisfying the limiting condition, under the regulation of not losing audio signal to noise, the input of tolerating the audio signal of large amplitude, circuit structure is simple, input impedance is high, and output impedance is low, makes the preceding and succeeding stages circuit of stereo set product match easily.
Drawings
FIG. 1 is a block diagram of an audio input clipping circuit;
fig. 2 is a circuit diagram of a gain adjustment unit;
FIG. 3 is a circuit diagram of an operational amplification unit;
FIG. 4 is a circuit diagram of an input unit;
fig. 5 is a circuit diagram of an audio input clipping circuit.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
It should be understood that in the present utility model, "plurality" means two or more. "and/or" is merely an association relationship describing an association object, and means that three relationships may exist, for example, and/or B may mean: a exists alone, A and B exist together, and B exists alone. The character "/" generally indicates that the context-dependent object is an "or" relationship. "comprising A, B and C", "comprising A, B, C" means that all three of A, B, C comprise, "comprising A, B or C" means that one of the three comprises A, B, C, and "comprising A, B and/or C" means that any 1 or any 2 or 3 of the three comprises A, B, C.
The technical scheme of the utility model is described in detail below by specific examples. The following embodiments may be combined with each other, and some embodiments may not be repeated for the same or similar concepts or processes.
Example 1
As shown in fig. 1, the present embodiment provides an analog audio input clipping circuit for sound, including:
the device comprises an input unit, an operational amplification unit, a gain adjusting unit and a limiting value adjusting unit;
the input unit is respectively connected with the operational amplification unit, the gain adjustment unit and the limiting value adjustment unit, receives the input of the first audio signal, and outputs a second audio signal after passing through the operational amplification unit, the gain adjustment unit and the limiting value adjustment unit.
Through adding audio input limiting circuit, just can solve and bear the audio signal amplitude lower and the not problem of matching of current some novel audio processing chip, under satisfying the limiting condition, under the regulation of not losing audio signal to noise, the input of tolerating the audio signal of large amplitude, circuit structure is simple, input impedance is high, and output impedance is low, makes the preceding and succeeding stages circuit of stereo set product match easily.
As shown in fig. 2, specifically, the gain adjusting unit includes a resistor R1 and a resistor R2, where the 1 st end of the resistor R1 is connected to the 2 nd end of the input unit, the 2 nd end of the resistor R1 is connected to the 1 st end of the resistor R2, the 1 st end of the limiting value adjusting unit, and the 2 nd end of the operational amplifier unit, and the 2 nd end of the resistor R2 is connected to the 2 nd end of the limiting value adjusting unit and the 1 st end of the operational amplifier unit, respectively, and then outputs the second audio signal.
As shown in fig. 3, specifically, the operational amplifier unit is an operational amplifier, the inverting input terminal of the operational amplifier is respectively connected with the 2 nd end of the resistor R1, the 1 st end of the limiting value adjusting unit and the 1 st end of the resistor R2, the positive input terminal is grounded, and the output terminal is respectively connected with the 2 nd end of the resistor R2 and the 2 nd end of the limiting value adjusting unit and outputs the second audio signal.
As shown in fig. 4, specifically, the input unit includes a capacitor having a capacitance of 1uF.
As shown in fig. 5, specifically, the clipping value adjusting unit includes a diode D1 and a diode D2, the diode D1 is connected in reverse series with the diode D2, the anode of the diode D1 is connected with the 1 st end of the resistor R2, the inverting input terminal of the operational amplifier, the cathode of the diode D1 is connected in series with the cathode of the diode D2, and the anode of the diode D2 is connected with the 2 nd end of the resistor R2, the output terminal of the operational amplifier and outputs the second audio signal.
The audio signal is input to the inverting terminal of the operational amplifier through C1, R1, and when the audio signal is input, the amplitude of the output audio signal is (R2/R1) times the amplitude of the input audio signal. When the output audio electric signal is larger than the clamping voltages of D1 and D2, the feedback resistance of the operational amplifier is approximately equal to 0 ohm due to the conduction and avalanche effect of the diode, and the amplitude of the output audio electric signal is equal to (0/R1) times of the amplitude of the input audio electric signal at the moment, namely the output amplitude is not increased after the output amplitude is equal to the clamping voltages of D1 and D2, so that the amplitude of the output audio electric signal is limited and cannot be increased along with the increase of the amplitude of the input audio electric signal, and the effect of limiting is achieved.
Specifically, the limiting value adjusting unit includes a diode D1 and a diode D2, the diode D1 is connected in anti-parallel with the diode D2, the 1 st end of the limiting value adjusting unit after parallel connection is connected with the 1 st end of the resistor R2 and the inverting input end of the operational amplifier, and the 2 nd end of the limiting value adjusting unit after parallel connection is connected with the 2 nd end of the resistor R2 and the output end of the operational amplifier, and outputs the second audio signal.
It should be noted that, the effect of amplitude limiting can be achieved through the two diodes in reverse series connection and in reverse parallel connection, the amplitude of the output of the input end of the specific audio frequency is adjusted according to the requirements of the specific device, the output end is generally connected with a Digital Signal Processor (DSP) power amplifier, a Digital Signal Processor (DSP) sound equipment, an earphone amplifier and the like, and the output amplitude can be adjusted by adjusting the values of a resistor R1 and a resistor R2 in the gain adjusting unit.
Through adding audio input limiting circuit, just can solve and bear the audio signal amplitude lower and the not problem of matching of current some novel audio processing chip, under satisfying the limiting condition, under the regulation of not losing audio signal to noise, the input of tolerating the audio signal of large amplitude, circuit structure is simple, input impedance is high, and output impedance is low, makes the preceding and succeeding stages circuit of stereo set product match easily.
Example two
The embodiment provides a stereo set, including stereo set body, sound source input and audio receiving arrangement, still include:
the audio frequency input limiting circuit, the input of audio frequency input limiting circuit is connected with the sound source input, and the output is connected with audio frequency receiving arrangement, includes: the device comprises an input unit, an operational amplification unit, a gain adjusting unit and a limiting value adjusting unit;
the input unit is respectively connected with the operational amplification unit, the gain adjustment unit and the limiting value adjustment unit, receives the input of the first audio signal, and outputs a second audio signal after passing through the operational amplification unit, the gain adjustment unit and the limiting value adjustment unit.
Through adding audio input limiting circuit, just can solve and bear the audio signal amplitude lower and the not problem of matching of current some novel audio processing chip, under satisfying the limiting condition, under the regulation of not losing audio signal to noise, the input of tolerating the audio signal of large amplitude, circuit structure is simple, input impedance is high, and output impedance is low, makes the preceding and succeeding stages circuit of stereo set product match easily.
As shown in fig. 2, specifically, the gain adjusting unit includes a resistor R1 and a resistor R2, where the 1 st end of the resistor R1 is connected to the 2 nd end of the input unit, the 2 nd end of the resistor R1 is connected to the 1 st end of the resistor R2, the 1 st end of the limiting value adjusting unit, and the 2 nd end of the operational amplifier unit, and the 2 nd end of the resistor R2 is connected to the 2 nd end of the limiting value adjusting unit and the 1 st end of the operational amplifier unit, respectively, and then outputs the second audio signal.
As shown in fig. 3, specifically, the operational amplifier unit is an operational amplifier, the inverting input terminal of the operational amplifier is respectively connected with the 2 nd end of the resistor R1, the 1 st end of the limiting value adjusting unit and the 1 st end of the resistor R2, the positive input terminal is grounded, and the output terminal is respectively connected with the 2 nd end of the resistor R2 and the 2 nd end of the limiting value adjusting unit and outputs the second audio signal.
As shown in fig. 4, specifically, the input unit includes a capacitor having a capacitance of 1uF.
As shown in fig. 5, specifically, the clipping value adjusting unit includes a diode D1 and a diode D2, the diode D1 is connected in reverse series with the diode D2, the anode of the diode D1 is connected with the 1 st end of the resistor R2, the inverting input terminal of the operational amplifier, the cathode of the diode D1 is connected in series with the cathode of the diode D2, and the anode of the diode D2 is connected with the 2 nd end of the resistor R2, the output terminal of the operational amplifier and outputs the second audio signal.
The audio signal is input to the inverting terminal of the operational amplifier through C1, R1, and when the audio signal is input, the amplitude of the output audio signal is (R2/R1) times the amplitude of the input audio signal. When the output audio electric signal is larger than the clamping voltages of D1 and D2, the feedback resistance of the operational amplifier is approximately equal to 0 ohm due to the conduction and avalanche effect of the diode, and the amplitude of the output audio electric signal is equal to (0/R1) times of the amplitude of the input audio electric signal at the moment, namely the output amplitude is not increased after the output amplitude is equal to the clamping voltages of D1 and D2, so that the amplitude of the output audio electric signal is limited and cannot be increased along with the increase of the amplitude of the input audio electric signal, and the effect of limiting is achieved.
Specifically, the limiting value adjusting unit includes a diode D1 and a diode D2, the diode D1 is connected in anti-parallel with the diode D2, the 1 st end of the limiting value adjusting unit after parallel connection is connected with the 1 st end of the resistor R2 and the inverting input end of the operational amplifier, and the 2 nd end of the limiting value adjusting unit after parallel connection is connected with the 2 nd end of the resistor R2 and the output end of the operational amplifier, and outputs the second audio signal.
It should be noted that, the effect of amplitude limiting can be achieved through the two diodes in reverse series connection and in reverse parallel connection, the amplitude of the output of the input end of the specific audio frequency is adjusted according to the requirements of the specific device, the output end is generally connected with a Digital Signal Processor (DSP) power amplifier, a Digital Signal Processor (DSP) sound equipment, an earphone amplifier and the like, and the output amplitude can be adjusted by adjusting the values of a resistor R1 and a resistor R2 in the gain adjusting unit.
Through adding audio input limiting circuit, just can solve and bear the audio signal amplitude lower and the not problem of matching of current some novel audio processing chip, under satisfying the limiting condition, under the regulation of not losing audio signal to noise, the input of tolerating the audio signal of large amplitude, circuit structure is simple, input impedance is high, and output impedance is low, makes the preceding and succeeding stages circuit of stereo set product match easily.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.

Claims (10)

1. An analog audio input clipping circuit for use with sound, comprising:
the device comprises an input unit, an operational amplification unit, a gain adjusting unit and a limiting value adjusting unit;
the input unit is respectively connected with the operational amplification unit, the gain adjustment unit and the limiting value adjustment unit, receives the input of the first audio signal, and outputs a second audio signal after passing through the operational amplification unit, the gain adjustment unit and the limiting value adjustment unit.
2. An analog audio input limiter circuit for sound, as claimed in claim 1,
the gain adjusting unit comprises a resistor R1 and a resistor R2, wherein the 1 st end of the resistor R1 is connected with the 2 nd end of the input unit, the 2 nd end of the resistor R1 is respectively connected with the 1 st end of the resistor R2, the 1 st end of the limiting value adjusting unit and the 2 nd end of the operational amplification unit, and the 2 nd end of the resistor R2 is respectively connected with the 2 nd end of the limiting value adjusting unit and the 1 st end of the operational amplification unit and then outputs a second audio signal.
3. An analog audio input limiter circuit for sound, as claimed in claim 2,
the operational amplifier unit is an operational amplifier, the reverse input end of the operational amplifier is respectively connected with the 2 nd end of the resistor R1, the 1 st end of the limiting value adjusting unit and the 1 st end of the resistor R2, the positive input end is grounded, and the output end is respectively connected with the 2 nd end of the resistor R2 and the 2 nd end of the limiting value adjusting unit and outputs a second audio signal.
4. An analog audio input limiter circuit for acoustic equipment, as claimed in claim 3,
the input unit includes a capacitor.
5. An analog audio input clipping circuit for acoustic equipment according to claim 4, characterized in that the clipping value adjusting unit comprises a diode D1 and a diode D2, the diode D1 is connected in anti-series with the diode D2, the anode of the diode D1 is connected with the 1 st terminal of the resistor R2, the inverting input terminal of the operational amplifier, the cathode of the diode D1 is connected in series with the cathode of the diode D2, the anode of the diode D2 is connected with the 2 nd terminal of the resistor R2, the output terminal of the operational amplifier and outputs the second audio signal.
6. An analog audio input limiter circuit for sound, as in claim 4,
the limiting value adjusting unit comprises a diode D1 and a diode D2, the diode D1 is connected with the diode D2 in an anti-parallel mode, the 1 st end of the limiting value adjusting unit after being connected in parallel is connected with the 1 st end of the resistor R2 and the inverting input end of the operational amplifier, and the 2 nd end of the limiting value adjusting unit after being connected in parallel is connected with the 2 nd end of the resistor R2 and the output end of the operational amplifier to output a second audio signal.
7. The utility model provides a stereo set, includes sound body, sound source input and audio receiving arrangement, its characterized in that still includes:
the audio frequency input limiting circuit, the input of audio frequency input limiting circuit with the sound source input is connected, the output with the audio frequency receiving arrangement is connected, include: the device comprises an input unit, an operational amplification unit, a gain adjusting unit and a limiting value adjusting unit;
the input unit is respectively connected with the operational amplification unit, the gain adjustment unit and the limiting value adjustment unit, receives the input of the first audio signal, and outputs a second audio signal after passing through the operational amplification unit, the gain adjustment unit and the limiting value adjustment unit.
8. The audio amplifier of claim 7, wherein in the audio input clipping circuit, the gain adjusting unit includes a resistor R1 and a resistor R2, the 1 st end of the resistor R1 is connected to the 2 nd end of the input unit, the 2 nd end of the resistor R1 is connected to the 1 st end of the resistor R2, the 1 st end of the clipping value adjusting unit, and the 2 nd end of the operational amplifier unit, and the 2 nd end of the resistor R2 is connected to the 2 nd end of the clipping value adjusting unit and the 1 st end of the operational amplifier unit, respectively, and then outputs a second audio signal.
9. The audio amplifier of claim 8, wherein the audio input limiting circuit is an operational amplifier, the inverting input terminal of the operational amplifier is connected to the 2 nd terminal of the resistor R1, the 1 st terminal of the limiting value adjusting unit, and the 1 st terminal of the resistor R2, the non-inverting input terminal is grounded, and the output terminal is connected to the 2 nd terminal of the resistor R2 and the 2 nd terminal of the limiting value adjusting unit, respectively, and outputs a second audio signal.
10. The audio device according to claim 9, wherein in the audio input clipping circuit, the clipping value adjusting unit includes a diode D1 and a diode D2, the diode D1 is connected in anti-series with the diode D2, an anode of the diode D1 is connected with a 1 st terminal of the resistor R2 and an inverting input terminal of the operational amplifier, a cathode of the diode D1 is connected in series with a cathode of the diode D2, and an anode of the diode D2 is connected with a 2 nd terminal of the resistor R2 and an output terminal of the operational amplifier and outputs a second audio signal.
CN202222701363.0U 2022-10-13 2022-10-13 Analog audio input amplitude limiting circuit for sound equipment Active CN219019009U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202222701363.0U CN219019009U (en) 2022-10-13 2022-10-13 Analog audio input amplitude limiting circuit for sound equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202222701363.0U CN219019009U (en) 2022-10-13 2022-10-13 Analog audio input amplitude limiting circuit for sound equipment

Publications (1)

Publication Number Publication Date
CN219019009U true CN219019009U (en) 2023-05-12

Family

ID=86251167

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202222701363.0U Active CN219019009U (en) 2022-10-13 2022-10-13 Analog audio input amplitude limiting circuit for sound equipment

Country Status (1)

Country Link
CN (1) CN219019009U (en)

Similar Documents

Publication Publication Date Title
US7994857B2 (en) Dynamic constant power amplifier
US8532313B2 (en) Audio processing system for an audio output device
CN219019009U (en) Analog audio input amplitude limiting circuit for sound equipment
US20120039487A1 (en) First stage amplifier circuit
CN112039447A (en) Audio power amplifier integrated circuit and audio equipment
US20120300959A1 (en) Ribbon microphone with usb output
US20200112317A1 (en) Resistive dac with summing junction switches, current output reference, and output routing methods
US10979834B2 (en) Audio signal control circuit, audio system, and method of controlling audio signal
CN115767371A (en) Analog audio input amplitude limiting circuit for sound equipment
CN111800152B (en) Circuit for extracting received signal strength in receiver
US20050213783A1 (en) Transmission drive line for low level audio analog electrical signals
CN102538952A (en) High-sensitivity thunder test circuit
CN215420721U (en) Sound box mute circuit
CN212518923U (en) Audio power amplifier integrated circuit and audio equipment
CN219978394U (en) Commercial electric signal acquisition circuit
US20020172380A1 (en) Impedance adapter preamplifier device for electronic tube audio frequencies able to be inserted on line on the path of the low frequency signal
US11881821B2 (en) Signal generating circuit and audio processing device
CN219893445U (en) Signal amplitude limiting mute circuit and audio equipment
CN114697844B (en) Microphone circuit, microphone module and microphone sound pressure overload point lifting method
US3531596A (en) Treble and bass control circuit
US11121678B1 (en) Vacuum tube amplification system capable of reducing residual noise and a grounding method thereof
CN209642952U (en) A kind of accessory device of simulation signal generator
CA2846321A1 (en) Voltage controlled amplifier and method of using the same
CN216565081U (en) High-reliability power amplifier
KR20110119173A (en) Digital audio amplifiers with a negative feedback of speaker current

Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant