PURPOSE: To provide the digital signal transmission system realizing the transmission and reception of a digital signal in plural input/output channels with a simple circuitry.

CONSTITUTION: An AV information signal A outputted from a terminal equipment 12a is sent at the constant intervals for each sampling period. Similarly, an AV information signal B outputted from a terminal equipment 12b is sent for each sampling period in the timing which is not overlapped with the AV information signal A. An AV information signal C outputted from a terminal equipment 12c is sent for each sampling period in the timing which is not overlapped with the AV information signal A and the AV information signal B. Thus, The AV information signals A-C are sent in time division in a music bus 14 and the AV equipment extracts them in the timing for respective terminal equipment 12a-12c. Thus, the AV information signals can be obtained without using buffers.