After this text introduced and will imitate the audio frequency signal processing as numerical signal after red shoot outside, the numerical signal that will receive again solution adjust after the audio frequency power enlarger enlarge restore in order to imitate the speech signal, shot the electric circuit outside analyzed to design the audio frequency signal before collecting the electric circuit, signal placed the big electric circuit, frequency to make the electric circuit, red, red circumscribed to accept the electric circuit,, frequency the solution adjusted the electric circuit and audio frequencies to enlarge the electric circuit etc. was each to constitute the part.The article elaborated that the adoption LM324 four lucks put the integrated circuit generally to be carry on by the speech signal that the microphone collect enlarge of electric circuit of principle and characteristics, and expatiation adopt the to trigger the electric circuit to carry on to the speech signal 555:00 make of electric circuit of principle and characteristics, adopt the buffer electric circuit of the 74 LS07 buffer, and use the LM2822 audio frequency power enlarger to carry on enlarge towards the solution audio frequency signal adjust behind that receive.
Key words: The frequency make;The frequency solution adjust;Place before greatly;Four operations enlarge