a device divides a sampled sound signal into a high frequency signal and a low frequency signal , individually encodes the high frequency signal and the low frequency signal , and generates error detection code pertinent to the high frequency adpcm data and the low frequency adpcm data . the device replaces data pertinent to some of a plurality of bits which configure the low frequency adpcm data with the error detection code and transmits them . a receiver side receives the high frequency adpcm data and the low frequency adpcm data , and individually processes the high frequency adpcm data and the low frequency adpcm data in accordance with a value of the error detection code .