| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To reduce a delay in sound signal due to transmission and reception and also prevent reception quality from being degraded by multipath fading. <P>SOLUTION: A wireless microphone OFDM transmission device 1a comprises: an inner code coding unit 133 which, upon accepting a digital sound signal input thereto in block units, turns the signal into an inner code for every block to generate an inner code; an OFDM modulation unit 14 which modulates the inner code by an OFDM modulation method to generate an OFDM signal; and a transmission parameter setting unit 18 which sets parameters No (a number of data bits in block units input to the inner code coding unit 133), Ri (a coding rate of the inner code), M (a modulation multilevel number of the OFDM signal) and Nd (a data carrier number of the OFDM signal), so that the equation No=Ri×M×Nd will be satisfied, and that the symbol length of the OFDM signal will be an integral multiple of a sound signal sampling interval. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
