A transmission apparatus comprising: a video obtainer configured to obtain a video baseband signal for forming images as an uncompressed signal, said video baseband signal being sampled at a sampling frequency Fs; a signal processor configured to perform a video separating processing for the obtained video baseband signal by (i) separating the obtained video baseband signal into a low-band video signal and a high-band video signal by filtering the video baseband signal through a low-pass filter circuit that only passes frequencies in a band from 0 to Fs/4 inclusive to obtain the low-band video signal, and through a bandpass filter circuit that passes frequencies in a band from Fs/4 to Fs/2 inclusive to obtain the high-band video signal, (ii) sub-sampling the high-band video signal at a sampling frequency Fs/2 to fold back the high-band video signal to the low band from 0 to Fs/4 inclusive; (iii) converting the low-band video signal into an electrical signal complying with a high definition multimedia interface (HDMI (registered trademark)) standard by using a first converter included in the transmission apparatus, (iv) converting the high-band video signal having undergone the sub-sampling into an optical signal by using a second converter included in the transmission apparatus, wherein the transmission apparatus is configured to transmit the electrical signal and the optical signal. a video obtainer configured to obtain a video baseband signal for forming images as an uncompressed signal, said video baseband signal being sampled at a sampling frequency Fs; a signal processor configured to perform a video separating processing for the obtained video baseband signal by (i) separating the obtained video baseband signal into a low-band video signal and a high-band video signal by filtering the video baseband signal through a low-pass filter circuit that only passes frequencies in a band from 0 to Fs/4 inclusive to obtain the low-band video signal, and through a bandpass filter circuit that passes frequencies in a band from Fs/4 to Fs/2 inclusive to obtain the high-band video signal, (ii) sub-sampling the high-band video signal at a sampling frequency Fs/2 to fold back the high-band video signal to the low band from 0 to Fs/4 inclusive; (iii) converting the low-band video signal into an electrical signal complying with a high definition multimedia interface (HDMI (registered trademark)) standard by using a first converter included in the transmission apparatus, (iv) converting the high-band video signal having undergone the sub-sampling into an optical signal by using a second converter included in the transmission apparatus, wherein the transmission apparatus is configured to transmit the electrical signal and the optical signal. (i) separating the obtained video baseband signal into a low-band video signal and a high-band video signal by filtering the video baseband signal through a low-pass filter circuit that only passes frequencies in a band from 0 to Fs/4 inclusive to obtain the low-band video signal, and through a bandpass filter circuit that passes frequencies in a band from Fs/4 to Fs/2 inclusive to obtain the high-band video signal, (ii) sub-sampling the high-band video signal at a sampling frequency Fs/2 to fold back the high-band video signal to the low band from 0 to Fs/4 inclusive; (iii) converting the low-band video signal into an electrical signal complying with a high definition multimedia interface (HDMI (registered trademark)) standard by using a first converter included in the transmission apparatus, (iv) converting the high-band video signal having undergone the sub-sampling into an optical signal by using a second converter included in the transmission apparatus,