Patent ID: 7821537

Claim:
A signal processing apparatus comprising: an input unit adapted to input an audio signal; a buffer unit adapted to buffer the audio signal input by said input unit; a write controller adapted to write the audio signal into said buffer memory in accordance with a first timing signal; a communication unit adapted to read out the audio signal from said buffer memory in accordance with a second timing signal having a frequency different from that of the first timing signal, and transmit the read-out audio signal to an external device through a transmission path; a detector adapted to detect whether the volume of sound of the audio signal read out from said buffer memory becomes smaller than a predetermined threshold value or not; a read-out controller adapted to change a read-out position of the audio signal in said buffer memory to a determined position in accordance with said detector detecting that the volume of sound of the audio signal read out from said buffer memory becomes smaller than the predetermined threshold value, wherein said read-out controller determines the determined position based on a write position of the audio signal in said buffer memory, controlled by said write controller, and an ideal amount of the audio signal to be buffered in said buffer memory at a time when said communication unit starts reading out the audio signal from said buffer memory.