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This lesson continues with the microphone circuit

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Let's see where the microphone is

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The main microphone is usually on the small board of the tail plug

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Android phones have a small circuit board at the end

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The microphone should be designed on the edge of the phone as much as possible

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So we will find that the microphone is on the edge of the phone

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This is the tail plug board

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What are the functions of this main microphone?

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First, when the hands-free call is not turned on,

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it is responsible for transmitting what we say to the other party

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That is to say, when the hands-free call is not turned on, the other party can hear our voice,

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which means that our main microphone is fine.

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Another function is to send voice messages

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When we send a voice message to a friend on the chat software,

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the main microphone will be activated

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The third function is the recording function

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When we turn on the recording software to record sound, the main microphone will start to work,

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which is to complete the recording by the main microphone

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Of course, there is a problem to pay attention to here.

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For the current mobile phone recording, such as the Huawei P40 mobile phone,

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if we disconnect the cable of the small board at the end,

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it will make the line of the microphone lose contact with the mainboard

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At this time, it will enable the top microphone to record

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In other words, in most cases, the recording mainly relies on the main microphone

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But on current smartphones, when recording, when the microphone at the rear cannot be detected,

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it will turn on the microphone at the top, which is the secondary microphone

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Therefore, when recording, the use of microphones cannot be generalized.

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You can also test it yourself

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Let's look at the failure caused by the main microphone

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Faults often correspond to functions

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So the fault it causes is that when the hands-free call is not turned on,

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the other party cannot hear our voice

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This must be considered to be a problem with the main microphone or the circuit of the main microphone

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Of course you can't just consider the problem of a single microphone

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Because this microphone also has its own circuitry

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Also, when sending a voice message, the other party cannot hear our voice,

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or cannot send a voice message

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When recording, it can respond to us normally

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This is the main microphone will cause the failure

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What is the concept of sending a message

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It means that the microphone collects the sound of our speech,

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turns the sound signal into an electrical signal, and transmits it to the circuit,

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which is called voice transmission.

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No voice means that the microphone cannot collect the sound and hand it over to the circuit for processing

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The cause of no voice transmission is that the microphone is damaged,

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or the working condition of the microphone circuit is not normal

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The working conditions include power supply, signal transmission channel,

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and chip circuit that processes this signal

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The microphone is damaged or the condition of the microphone is not normal,

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it can't transmit the sound to the main audio

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The main audio is mainly responsible for processing the signal of the microphone

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Here's where the main mic is and what causes the no-talk

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That's all for this lesson