Each subframe consists of 32 bits: 24 bits of maximum resolution (information) for each audio sample combined with 4 flag bits and 4 synchronization bits. An AES3 frame is divided into two subframes, one for each of the two channels. AES3 is made up of audio blocks, where each one of them contains 192 consecutive frames. An AES3 stream/signal can carry two channels of PCM audio data, up to 24 bits - 192 kHz. The bit depth of the Dolby E data mode is what is shown in MediaInfo.Ī Dolby E stream/signal is carried within an AES3 stream/signal in. The bit depth of the Dolby E data mode is carried as information in the metadata and doesn’t correlate to the bit depth of the Dolby E encoded audio. The 20-bit and 24-bit data modes with a maximum of 8 channels. The 16-bit data mode with a maximum of 6 channels. There are three data modes available for Dolby E, which are measured in bits and determine the number of channels that Dolby E can carry. The sample rate of the Dolby E encoded audio should always be at 48 kHz. It achieves an approximately 4:1 compression ratio and can withstand multiple encode-decode cycles without any audible degradation. Dolby E is a lossy audio codec introduced by Dolby Laboratories in 1999.
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