We have developed a bit-error-robust speech-and-audio codec working in low-delay conditions. Inter-device audio transmission, such as in microphones, requires strict real-time processing. It is a challenge to enhance the compression efficiency in such conditions, which enables us to use more microphones at once in a room. Sometimes, this kind of inter-device transmission encounter errors occurring in the encoded data, and codecs have to deal with them to avoid severe decoding errors. Especially in low-delay conditions, it is hard to protect codes with additional information keeping the bitrates. Therefore, we proposed a bit rearrangement technique, which makes lower the impact of the errors compressing data efficiently. Using this technique, the developed codec BRAVE can compress speech and audio data in a very short time and is robust for bit errors. It is thus expected to be useful also for other use cases such as the Internet of things (IoT).
/ Moriya Research Laboratory