| 摘要 |
PROBLEM TO BE SOLVED: To efficiency transmit audio signals by infrared rays while suppressing the complication of data processings at the time of modulation and at the time of demodulation to minimum. SOLUTION: The audio signals reproduced in a digital audio equipment 200 are transmitted through an audio signal transmitter 2a to a digital audio recorder 203 by the infrared rays and recorded. In the digital audio recorder 203, the recorded audio signals are immediately reproduced, transmitted through the audio transmitter 2b to the digital audio equipment 204 also by the infrared rays and outputted. In transmitters 6a and 6b, the transmission channel clocks of the frequency of 5/4 fold of the data clocks are generated from the audio signals and modulated signals for which the audio signals are modulated are outputted by the timing of the transmission channel clocks. Further, in the transmitters 6a and 6b, the modulation is performed by using the frequency for not overlapping the frequency bands of the modulated signals. |
