Method and system for transmitting audio signals

A method for transmitting audio signals, comprising:

• establishing a wireless link utilizing Bluetooth LE Audio between an audio signal transmission unit and an audio signal receiver unit;
• transmitting BIS data PDUs representative of an audio signal via the wireless link from the audio signal transmission unit to the audio signal receiver unit;
• providing, by the audio signal transmission unit, a BIG control PDU with time-critical control data to be transmitted to the audio signal receiver unit as part of its payload, wherein a marked CRC value is provided in a standard CRC field of said BIG control PDU which is different from the standard CRC value of said BIG control PDU and wherein the marked CRC value is calculated as a customized CRC value by a first algorithm from the payload of the BIG Control PDU;
• transmitting, by the audio signal transmission unit, the BIG control PDU via the wireless link to the audio signal receiver unit, and receiving, by the receiver unit, the BIG control PDU;
• analyzing, by the audio signal receiver unit, the received BIG Control PDU as to whether or not the payload comprises time-critical control data, wherein the audio signal receiver unit calculates, using the first algorithm, the customized CRC value of the received BIG control PDU, and wherein the time-critical control data in the received BIG control PDU is verified as valid control data for the audio signal receiver unit when the customized CRC value is found to match with the value in the standard CRC field of the received BIG control PDU;
• and
• when the customized CRC value is found to not match with the value in the standard CRC field of the received BIG control PDU, calculating, by the audio signal receiver unit, the standard CRC value of the received BIG control PDU and comparing the calculated standard CRC value with the value of the standard CRC field of the received BIG control PDU, wherein the audio signal receiver unit considers the BIG control PDU to contain Bluetooth LE Audio control data when the calculated standard CRC value matches with the value of the standard CRC field of the received BIG control PDU.

A system for transmitting audio signals, comprising an audio signal transmission unit and an audio signal receiver unit, both of which include a wireless interface for establishing a wireless link utilizing Bluetooth LE Audio between the audio signal transmission unit and the audio signal receiver unit;

• the audio signal transmission unit being configured to
• transmit BIS data PDUs representative of an audio signal via the wireless link from the audio signal transmission unit to the audio signal receiver unit;
• provide a BIG control PDU with time-critical control data to be transmitted to the audio signal receiver unit as part of its payload, wherein a marked CRC value is provided in a standard CRC field of said BIG control PDU which is different from the standard CRC value of said BIG control PDU;
• transmit the BIG control PDU via the wireless link to the audio signal receiver unit;
• the audio signal receiver unit being configured to
• calculate the standard CRC value of the BIG control PDU received from the audio signal transmission unit;
• compare the standard CRC value with the value of the standard CRC field of the received BIG control PDU;
• and
• analyze the received BIG control PDU as to whether or not the payload comprises time-critical control data, when the value of the standard CRC field of the received BIG control PDU does not match the calculated standard CRC value of the received BIG control PDU.

A system for transmitting audio signals, comprising an audio signal transmission unit and an audio signal receiver unit, both of which include a wireless interface for establishing a wireless link utilizing Bluetooth LE Audio between the audio signal transmission unit and the audio signal receiver unit;

• the audio signal transmission unit being configured to
• transmit BIS data PDUs representative of an audio signal via the wireless link from the audio signal transmission unit to the audio signal receiver unit;
• provide a BIG control PDU with time-critical control data to be transmitted to the audio signal receiver unit as part of its payload, wherein a marked CRC value is provided in the standard CRC field of said BIG control PDU which is different from the standard CRC value of said BIG control PDU, and wherein the marked CRC value is calculated as a customized CRC value by a first algorithm from the payload of the BIG Control PDU;
• and
• transmit the BIG control PDU via the wireless link to the audio signal receiver unit;
• the audio signal receiver unit being configured to
• analyze the received BIG Control PDU as to whether or not the payload comprises time-critical control data by calculating, using the first algorithm, the customized CRC value of the received BIG control PDU, wherein:
• when the customized CRC value is found to match with the value in a standard CRC field of the received BIG control PDU the time-critical control data in the received BIG control PDU is verified as valid control data for the audio signal receiver unit;
• and
• when the customized CRC value is found to not match with the value in the standard CRC field of the received BIG control PDU, the standard CRC value of the received BIG control PDU is calculated and is compared with the value of the standard CRC field of the received BIG control PDU, wherein the BIG control PDU is considered to contain Bluetooth LE Audio control data when the calculated standard CRC value matches with the value of the standard CRC field of the received BIG control PDU.