The invention belongs to the technical field of communication, and particularly relates to a
signal transmission method, a sending end in-vehicle infotainment
system and a receiving end in-vehicle infotainment
system. According to the
signal transmission method applied to the sending end vehicle-mounted
terminal system, the sending end vehicle-mounted
terminal system is connected with sending end communication equipment, the sending end communication equipment is used for transmitting analog audio signals, and the
signal transmission method comprises the steps that when a user inputs voice through the sending end communication equipment, the analog audio signals are transmitted to the sending end communication equipment; acquiring a voice signal input by user voice; performing
voice analysis processing on the voice signal to obtain
digital content information corresponding to the voice signal; performing audio coding
processing on the
digital content information according to the corresponding relationship between the frequency and the
data value to obtain an analog
audio signal corresponding to the
digital content information; and sending the analog
audio signal to the sending end communication equipment, so that the sending end communication equipment sends the analog
audio signal to receiving end communication equipment.