WIRELESS SOUND TRANSMISSION AND METHOD

摘要

The invention relates to a A system for providing sound to at least one user (13), comprising: at least one audio signal source (17) for providing an audio signal; a transmission unit (10, 110) comprising a digital transmitter (28) for transmitting the audio signal as audio data packets from the audio signal source via a wireless digital audio link (12); at least one receiver unit (14) for reception of audio signals from the transmission unit via the digital audio link, comprising at least one digital receiver (61); means (16, 64. 82) for stimulating the hearing of the user(s) according to audio signals supplied from the receiver unit; wherein the transmission unit is adapted to encode the audio signal in such a manner that each audio data block is distributed onto at least two audio data packets in such a manner that one of the packets is a low-quality packet including an encoded low-quality version of the audio signal, and one of the packets is a high quality packet including the surplus of an encoded high- quality version of the audio signal with regard to the low quality version, so that by decoding of the low-quality packets only a low-quality version of the audio signal is retrievable, whereas by decoding of both the low-quality packets and the high-quality packets a high- quality version of the audio signal is retrievable, and wherein the transmission unit is adapted to transmit the low-quality packets in dedicated slots of a multiple access protocol frame and to transmit the high-quality packets in other dedicated slots of the multiple access protocol frame, and wherein each receiver unit is either adapted to receive and decode both the low- quality packets and the high-quality packets or is adapted to receive and decode the low- quality packets only, while sleeping during the slots dedicated to the transmission of t he high- quality packets.