How many signal lines does the car stereo have?

No matter how many speakers are installed in the car, they are all audio lines. And then connected to each speaker at the branch.

Good DSP has been debugged by technicians after installation, and the effect is very obvious!

Choose brand products, four channels are generally front, left, front, right, back, left and right, and five channels have one channel to control the output to alto or bass. The purpose is that all speakers are controlled by DSP, which is good.

introduce

Audio line signaling is a monitoring signal for establishing telephone circuit exchange, including busy, disconnected, repeatedly disconnected, answering, hanging up, monitoring release, blocking, re-ringing, forced demolition, ringing, forced demolition, please send code, first number confirmation, called user arrival and other 14 signals.

It adopts 2 600Hz in-band single frequency, and is composed of short signal unit, long signal unit, continuous signal unit and long and short signal unit. The short message number unit is a short message number pulse with a nominal value of150 ms; ; The long signal unit is a long signal pulse with a nominal value of 600 ms