| 摘要 |
A property of the hearing system, i.e. masking effect, can be utilized, as is known in the art, so that to any audio signal a second, weaker signal can be added inaudibly. In a system of prior art employing said principle an analysis of the audio signal and calculation of the masking threshold are carried out both in the transmitter and the receiver. This operation results in a complicated decoder and on certain occasions, audible distortion in a repeated audio signal. According to the present invention this can be so avoided that the transmitter transmits all data required in decoding on a separate data channel. Hereby, the decoder operates under the control of the transmitter. <IMAGE> |
