CN213661908U - Stereo set PWM signal changes analog level display circuit - Google Patents
Stereo set PWM signal changes analog level display circuit Download PDFInfo
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- CN213661908U CN213661908U CN202022827357.0U CN202022827357U CN213661908U CN 213661908 U CN213661908 U CN 213661908U CN 202022827357 U CN202022827357 U CN 202022827357U CN 213661908 U CN213661908 U CN 213661908U
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- 238000005859 coupling reaction Methods 0.000 claims description 15
- 239000003990 capacitor Substances 0.000 claims description 12
- 238000001914 filtration Methods 0.000 claims description 5
- 230000005236 sound signal Effects 0.000 abstract description 6
- 230000008447 perception Effects 0.000 abstract 1
- 238000004088 simulation Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
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Abstract
The utility model provides a stereo set PWM signal changes simulation level display circuit belongs to the stereo set circuit field. The utility model discloses a two way processing branch roads that the structure is the same, one of them branch road is handled the PWM signal of left sound channel, and another one is handled the branch road and is used for handling the PWM signal of right sound channel, it includes low pass filter module, signal amplification module, rectifier module and voltage division module to handle the branch road, wherein, the input PWM signal of low pass filter module, the output links to each other with the signal amplification module input, the output of signal amplification module links to each other with rectifier module's input, rectifier module's output links to each other with voltage division module's input, voltage division module's output links to each other with the MCU input. The utility model has the advantages that: the strength of the current audio signal can be visually acquired by people, the adjustment can be visually performed, and the user perception is better.
Description
Technical Field
The utility model relates to a stereo set circuit especially relates to a stereo set PWM signal changes analog level display circuit.
Background
In the sound system, if the size of PWM audio output can be indicated by a pointer or a meter in real time, the whole machine is very visual, fashionable and beautiful, the pointer on the level meter swings back and forth along with the size of the PWM music signal, so that people can visually acquire the size of the audio, and the mood is not more comfortable when enjoying the pleasure music. The mode that can direct detection analog signal size is various in the market, but can detect the PWM size than less, and this circuit just in time comes to solve this problem.
SUMMERY OF THE UTILITY MODEL
For solving the problem among the prior art, the utility model provides a stereo set PWM signal changes analog level display circuit.
The utility model discloses a two way processing branch roads that the structure is the same, one of them branch road is handled the PWM signal of left sound channel, and another one is handled the branch road and is used for handling the PWM signal of right sound channel, it includes low pass filter module, signal amplification module, rectifier module and voltage division module to handle the branch road, wherein, the input PWM signal of low pass filter module, the output links to each other with the signal amplification module input, the output of signal amplification module links to each other with rectifier module's input, rectifier module's output links to each other with voltage division module's input, voltage division module's output links to each other with the MCU input.
The utility model discloses make further improvement, still include the coupling module to the PWM signal coupling of input, coupling module sets up the input of low pass filter module.
The utility model discloses make further improvement, coupling circuit is coupling capacitance.
The utility model discloses make further improvement, still include the clamp voltage protection module, the clamp voltage protection module sets up between partial pressure module output and the MCU input.
The utility model discloses make further improvement, the clamp voltage protection module is including diode D1 and diode D4 that concatenate, the output termination diode D1 of partial pressure module is between the positive pole of diode D4 and the negative pole, diode D1's negative pole power connection, diode D4's anodal ground connection.
The utility model discloses make further improvement, low pass filter module is second order low pass filter integrator circuit.
The utility model discloses make further improvement, second order low pass filter integrator circuit includes that fortune is put U1B, resistance R4, R5, R6, electric capacity C5, C9, wherein, fortune is put U1B positive phase input and is connect PWM signal output end behind resistance R4 and the resistance R5 through establishing ties, fortune is put U1B positive phase input and still is linked to each other with parallelly connected electric capacity C5 and resistance R4's one end respectively, the power is set for to parallelly connected electric capacity C5 and resistance R4's another termination, between electric capacity C9's a termination resistance R4 and resistance R5, the other end links to each other with fortune is put U1B's inverting input and output respectively.
The utility model discloses make further improvement, the signal amplification module includes that fortune is put U1A, resistance R3, R8, R11, electric capacity C12, wherein, U1A's normal phase input end is put to fortune connects through resistance R3 and sets up the power, and the inverting input end connects the output that U1B was put in the fortune through resistance R8, U1A's inverting input end is still put through resistance R11 and the electric capacity C12 who meets fortune is put U1A's output.
The utility model discloses make further improvement, rectifier module includes rectifier diode or rectifier more than 1.
The utility model discloses make further improvement, the voltage division module includes first resistance and the parallelly connected second resistance more than 1, first resistance concatenates the rectifier module output, the one end of second resistance connects in parallel the output of second resistance, other end ground connection.
Compared with the prior art, the beneficial effects of the utility model are that: the size of the PWM audio signal can be detected, the PWM audio signal is converted into analog direct-current voltage to be sampled by an ADC (analog-to-digital converter) port of the MCU, and then dynamic signal intensity is displayed in real time through an LCD (liquid crystal display) screen pointer, so that people can visually acquire the intensity of the current audio signal, and the user can perceive better through targeted adjustment.
Drawings
FIG. 1 is a block diagram of the present invention;
fig. 2 is a schematic circuit diagram according to an embodiment of the present invention;
fig. 3 is a diagram of an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
As shown in fig. 1, the utility model is suitable for a sound system circuit has circuit of PWM signal, including two the same processing branch roads of tunnel structure, one of them branch road is handled the PWM signal of left sound channel, and another one is handled the branch road and is used for handling the PWM signal of right sound channel, it includes low pass filter module, signal amplification module, rectifier module and voltage division module to handle the branch road, wherein, the input PWM signal of low pass filter module, the output links to each other with signal amplification module input, the output of signal amplification module links to each other with rectifier module's input, rectifier module's output links to each other with voltage division module's input, voltage division module's output links to each other with the MCU input. The PWM signal coupling circuit further comprises a coupling module for coupling the PWM signal at the input end, wherein the coupling module is arranged at the input end of the low-pass filtering module.
In order to prevent the input direct current voltage from exceeding the voltage threshold of the ADC of the MCU and burning out the MCU, the present embodiment further comprises a clamp voltage protection module, which is disposed between the output terminal of the voltage division module and the input terminal of the MCU.
As shown in fig. 2, the PWML and PWMR left and right binaural signals of this example are coupled by capacitors C6 and C18, and then enter two sets of second-order low-pass filter integrator circuits formed by operational amplifiers U1B and U2B, resistors R4, R5, R6, R15, R16 and R17, capacitors C5, C9, C17 and C21, so as to convert the PWM signals into signals similar to sine waves. Similar other low-pass filter circuits on the market can also be used in the circuit of the utility model.
The operational amplifiers U1A and U2A, resistors R3, R8, R11, R14, R19 and R22 and capacitors C12 and C24 form a left group and a right group of signal amplification modules, and the amplification factor value can be flexibly adjusted according to the requirement so as to detect weak signals as small as several MVs.
The two groups of rectifying circuits are formed by diodes D2, D3, D6 and D7 and capacitors C10 and C22, and analog signals amplified by operational amplifiers U1A and U2A are converted into direct-current voltage. The diode of this example is preferably a ge schottky diode 1N5819 with a small voltage drop (< 0.3V) to better detect very weak signals, which may not turn on the rectifier diode to operate if the signal is small with a silicon diode (about 0.7V tube drop).
The two-component voltage circuit is composed of resistors R7, R9, R10, R18, R20 and R21, and is used for providing appropriate direct current detection voltage for the MCU. The resistor R9/R10 and the resistor R20/R21 are connected in parallel by two resistors, so that the condition that when one of the resistors is abnormal, such as cold solder or damaged, the resistor R7 and the resistor R18 form partial voltage is prevented, the MCU is prevented from being damaged due to overhigh input voltage, and the MCU is used as a first layer of safety protection.
The diodes D1, D4, D5 and D8 of the present example constitute a second layer of clamping voltage protection to prevent the MCU from being burned out when the input DC voltage exceeds the ADC voltage threshold of the MCU.
The working principle of the embodiment is as follows:
the magnitude of the PWM audio signal is detected, the PWM audio signal is processed by each module and converted into analog direct-current voltage, the analog direct-current voltage is output to an interface of an ADC conversion module of the MCU for sampling processing, dynamic signal intensity is displayed in real time through an LCD display screen pointer, and the display effect is shown in figure 3.
The above-mentioned embodiments are the preferred embodiments of the present invention, and the scope of the present invention is not limited to the above-mentioned embodiments, and the scope of the present invention includes and is not limited to the above-mentioned embodiments, and all equivalent changes made according to the present invention are within the protection scope of the present invention.
Claims (10)
1. The utility model provides a stereo set PWM signal changes analog level display circuit which characterized in that: including two the same processing branch roads of road structure, one of them branch road is handled the PWM signal of left sound track, and another one is handled the branch road and is used for handling the PWM signal of right sound track, it includes low pass filter module, signal amplification module, rectifier module and voltage division module to handle the branch road, wherein, PWM signal is input to the input of low pass filter module, and the output links to each other with the signal amplification module input, the output of signal amplification module links to each other with rectifier module's input, rectifier module's output links to each other with voltage division module's input, voltage division module's output links to each other with the MCU input.
2. The audio PWM signal-to-analog level display circuit according to claim 1, wherein: the PWM signal coupling circuit further comprises a coupling module for coupling the PWM signal at the input end, and the coupling module is arranged at the input end of the low-pass filtering module.
3. The audio PWM signal-to-analog level display circuit according to claim 2, wherein: the coupling module is a coupling capacitor.
4. The audio PWM signal-to-analog level display circuit according to claim 1, wherein: the voltage divider further comprises a clamping voltage protection module, and the clamping voltage protection module is arranged between the output end of the voltage dividing module and the input end of the MCU.
5. The audio PWM signal-to-analog level display circuit according to claim 4, wherein: the clamping voltage protection module comprises a diode D1 and a diode D4 which are connected in series, the output end of the voltage division module is connected between the anode of the diode D1 and the cathode of the diode D4, the cathode of the diode D1 is connected with a power supply, and the anode of the diode D4 is grounded.
6. An audio PWM signal to analog level display circuit according to any one of claims 1 to 5, wherein: the low-pass filtering module is a second-order low-pass filtering integral circuit.
7. The audio PWM signal-to-analog level display circuit according to claim 6, wherein: the second-order low-pass filtering integrating circuit comprises an operational amplifier U1B, resistors R4, R5, R6, capacitors C5 and C9, wherein a positive phase input end of the operational amplifier U1B is connected with a PWM signal output end through a resistor R4 and a resistor R5 which are connected in series, the positive phase input end of the operational amplifier U1B is further connected with one ends of a capacitor C5 and a resistor R4 which are connected in parallel, the other ends of the capacitor C5 and the resistor R4 which are connected in parallel are connected with a set power supply, one end of the capacitor C9 is connected between a resistor R4 and a resistor R5, and the other ends of the capacitor C9 are connected with an inverted phase input end and an output end of the operational amplifier U.
8. The audio PWM signal-to-analog level display circuit according to claim 7, wherein: the signal amplification module comprises an operational amplifier U1A, resistors R3, R8, R11 and a capacitor C12, wherein a positive phase input end of the operational amplifier U1A is connected with a set power supply through a resistor R3, an opposite phase input end of the operational amplifier U1B is connected with an output end of the operational amplifier U1B through a resistor R8, and an opposite phase input end of the operational amplifier U1A is connected with an output end of the operational amplifier U1A through a resistor R11 and a capacitor C12 which are connected in parallel.
9. An audio PWM signal to analog level display circuit according to any one of claims 1 to 5, wherein: the rectifying module comprises more than 1 rectifying diode or rectifier.
10. An audio PWM signal to analog level display circuit according to any one of claims 1 to 5, wherein: the voltage division module comprises a first resistor and more than 1 second resistor connected in parallel, the first resistor is connected to the output end of the rectification module in series, one end of the second resistor is connected to the output end of the second resistor in parallel, and the other end of the second resistor is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022827357.0U CN213661908U (en) | 2020-11-27 | 2020-11-27 | Stereo set PWM signal changes analog level display circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022827357.0U CN213661908U (en) | 2020-11-27 | 2020-11-27 | Stereo set PWM signal changes analog level display circuit |
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| Publication Number | Publication Date |
|---|---|
| CN213661908U true CN213661908U (en) | 2021-07-09 |
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| CN202022827357.0U Active CN213661908U (en) | 2020-11-27 | 2020-11-27 | Stereo set PWM signal changes analog level display circuit |
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| CN (1) | CN213661908U (en) |
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- 2020-11-27 CN CN202022827357.0U patent/CN213661908U/en active Active
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Address after: 518000 1st floor, electronic building, Jiuwei Xiange technology and Culture Industrial Park, Jiuwei community, Hangcheng street, Bao'an District, Shenzhen, Guangdong Province Patentee after: IAG Group Ltd. Address before: 518000 Jiuwei Xiange science and Technology Industrial Park, Xi Township, Bao'an District, Shenzhen City, Guangdong Province Patentee before: IAG GROUP Co.,Ltd. |