Information processing device and mobile terminal

An information processing device comprising:

• a first terminal capable of coupling with a baseband processing portion;
• a second terminal capable of coupling with an audio processing portion;
• a first serial interface capable of exchanging compressed data with the baseband processing portion coupled through the first terminal;
• a speech processing portion capable of processing a speech signal incorporated by the first serial interface;
• a clock generator that generates a clock signal for PCM communication;
• and
• a second serial interface that uses a clock signal generated from the clock generator to enable PCM communication between the audio processing portion coupled through the second terminal and the speech processing portion,
• wherein the first serial interface includes a notification signal generation circuit that generates a notification signal each time compressed data incorporated from the baseband processing portion reaches a predetermined data quantity, and notifies the speech processing portion of this state using the notification signal,
• wherein the speech processing portion includes a synchronizing signal generation circuit that generates a network synchronizing signal based on the notification signal, and
• wherein the clock generator generates the clock signal for PCM communication based on the network synchronizing signal generated from the synchronizing signal generation circuit.