Similar to the I2S interface, the PCM interface is four signal cables, which are usually used to transmit voice data (that is, two-way phone call data) between the AP processor and the communication MODEM.
ic is the abbreviation of Integrated Circuit, integrated circuit refers to the use of a certain process, a certain number of commonly used electronic components, such as resistors, capacitors, transistors, etc., and the connection between these components, through the semiconductor process integrated together with a specific function of the circuit. We often say that the IC card refers to the integrated circuit card