We do not need to design complex voice processing such as DSP and arm. Here I only need to recognize high-frequency sounds such as applause. To achieve this function, in fact, only a microphone and a triode and some basic circuit components are needed to realize the voice processing circuit. The circuit diagram is as follows: At the power input of the entire circuit, R1, C1 (100ohm and 105 capacitors) are used to form a first-order filter, which can filter out a lot of noise from the power supply, and also isolate the influence of the signal circuit on the power supply. Then, the microphone signal forms the input phase of the signal processing circuit through a resistor and 105 capacitor (microphone can also be regarded as a triode). Next is the amplified phase composed of 4 resistors and triode. The four resistance values ​​have been carefully designed and calculated to ensure that the transistor works in the amplification area. The frequency of the sound is relatively low, and ordinary triodes can handle this signal better, and can ensure that the current amplification factor is about 100 to 120. Finally, there is an output phase formed by a diode and a capacitor c4. The diode is very critical here. It only allows current to flow to c4, but not to flow in the opposite direction. The combination of D2 and C4 achieves a greater frequency of the sound signal. Imagine a sinusoidal current signal flowing through D2. The positive part of the current flows past, while the negative part of the current is isolated. This leads to a theoretically higher and higher voltage in the C4 part. However, the voltage across C4 will not get higher and higher. One aspect is the influence of the power supply voltage, which causes the diode to no longer conduct. On the other hand, the plates at both ends of the capacitor will slowly discharge. The result of this final circuit is that the more high-frequency sound signals, the more frequent, the higher the voltage of capacitor C4. Without this signal, the voltage of the capacitor will decay rapidly. The central processing chip of the circuit only needs to convert the voltage of C4 through AD to obtain the sound signal.
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