Patent ID: 8601520
Filing Date: 2013-12-03
Classification: H04N

Abstract:
1. An input and output switching device comprising: a first interface which is connected to an external transmitting and receiving device, and at least transmits video data to, and receives audio data and a control signal from, the connected external transmitting and receiving device; a second interface which is connected to an external transmitting device, and at least receives video and audio data from the external transmitting device; a third interface which is connected to an external audio output device, and transmits audio data; an audio selector which switches a path through which the audio data is to be transmitted to the external audio output device; a controller that instructs said audio selector to switch the path, based on the control signal received by said first interface; and an audio data extractor that extracts audio data from the video and audio data received by said second interface, wherein, when a first instruction signal for selecting said first interface is received as the control signal: (a-i) said first interface receives the audio data from the external transmitting and receiving device, and outputs the received audio data to said audio selector; (a-ii) said controller issues, to said audio selector, a first input selection instruction for selecting said first interface as an input of said audio selector; (a-iii) said audio selector outputs, to said third interface, the audio data outputted from said first interface, when the first input selection instruction is received from said controller; and (a-iv) said third interface outputs, to the external audio output device, the audio data outputted by said audio selector, and when a second instruction signal for selecting said second interface is received as the control signal: (b-i) said second interface receives the video and audio data from the external transmitting device, and outputs the received video and audio data to said audio data extractor; (b-ii) said audio data extractor extracts the audio data from the video and audio data received from said second interface, and outputs the extracted audio data to said audio selector; (b-iii) said controller issues, to said audio selector, a second input selection instruction for selecting said second interface as the input of said audio selector; (b-iv) said audio selector outputs, to said third interface, the extracted audio data outputted from said audio data extractor, when the second input selection instruction is received from said controller; (b-v) said third interface outputs, to the external audio output device, the audio data outputted from said audio selector; and (b-vi) said first interface outputs, to the external transmitting and receiving device, the video and audio data received from the external transmitting device, said first interface receives the audio data from the external transmitting and receiving device only when the video data is not to be transmitted from said first interface to the external transmitting and receiving device, and does not receive the audio data when the video data is to be transmitted from said first interface to the external transmitting and receiving device, and said audio selector causes the external audio output device to output the audio data received from the external transmitting and receiving device only when the video data is not to be transmitted from said first interface to the external transmitting and receiving device, and causes the external audio output device to output the audio data extracted by said audio data extractor when the video data is to be transmitted from said first interface to the external transmitting and receiving device.