Patent ID: 8723971

Claim:
A transmission system comprising: a digital transmission path configured to transmit a digital video signal outputted from an imaging apparatus to a processing apparatus that executes one of processing and relaying of a video signal received from said imaging apparatus; an analog transmission path configured to transmit an analog reference signal outputted from said processing apparatus to said imaging apparatus, said analog reference signal including successive horizontal synchronous sections determined by horizontal synchronous signal components, the horizontal synchronous sections including data sections and command sections; a command superposing block in said processing apparatus configured to superpose, at an analog level, bits of command data for commanding said imaging apparatus in command sections of the analog reference signal in which the horizontal synchronous signal component is not included, said command data comprised of a serial command consecutively obtained at a predetermined data rate, said serial command being compressed in data rate in unit of one horizontal period interval, the compressed serial command being arranged in said command section; a digital conversion block configured to digitally convert an analog-level signal of each bit of a command included in a reference signal received via said analog transmission path in said imaging apparatus; and an imaging control block configured to control an imaging operation with a timing synchronized with the horizontal synchronous signal component included in the reference signal received via said analog transmission path and discriminate a command converted by said digital conversion block, thereby executing processing corresponding to the discriminated command in said imaging apparatus.