A digital audio interface, often found in high-end audio equipment, can be transmitted over a High-Definition Multimedia Interface (HDMI) connection. This allows for the transport of uncompressed digital audio data directly from a source device to a compatible audio processor or amplifier. Instead of relying on the standard HDMI audio protocol, this approach employs the IS (Inter-IC Sound) protocol over specific pins within the HDMI connector. This method can offer a more direct and potentially higher quality audio signal path compared to traditional HDMI audio extraction.
The advantage of transmitting audio data in this manner lies in its potential to minimize signal degradation and jitter. By bypassing the standard HDMI audio processing, the audio signal remains in its native digital form, reducing the risk of unwanted alterations or conversions. This can be particularly beneficial for audiophiles and professionals who demand the highest possible audio fidelity. Historically, IS was primarily used for internal communication between integrated circuits within audio devices. Extending its use over HDMI provides a means to transport high-resolution audio externally.
