Patent ID: 7304594
Filing Date: 2007-12-04
Classification: H04B

Abstract:
1. A transmitting and receiving device comprising: a transmitting device having a plurality of sigma-delta analog-to-digital conversion units, provided corresponding in number to channels of input analog signals, which generate binary digital signals by performing sigma-delta analog-to-digital conversion for the analog signals, a pulse width modulation encoder which generates a pulse width signal having a pulse width corresponding to the binary digital signals outputted from the plurality of sigma-delta analog-to-digital conversion units, and a light-emitting element drive unit which generates and transmits an optical signal by causing a light-emitting element to emit light on the basis of the pulse width signal; and a receiving device having an optical reception unit which converts a current signal, obtained by receiving the optical signal by a light-receiving element, into the pulse width signal, a pulse width demodulation decoder which reconstructs the binary digital signals of a plurality of channels on the basis of the pulse width signal, and a plurality of 1-bit digital-to-analog conversion units, provided corresponding in number to the channels of the binary digital signals, which reconstruct the analog signals by performing 1-bit digital-to-analog conversion for the input binary digital signals.