IEC /AMD Standard | Amendment 1 – Digital audio – Interface for non-linear PCM encoded audio bitstreams applying IEC. IEC Standard | Digital audio – Interface for non-linear PCM encoded audio bitstreams applying IEC – Part MPEG-H. IEC /AMD Standard | Amendment 2 – Digital audio – Interface for non-linear PCM encoded audio bitstreams applying IEC.
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For a non-PCM format, these three members have been commandeered to store information about the compressed data in the audio stream.
With this information, an application can infer the quality level of the non-PCM stream after it is decompressed and played. Maximum bit rate in 61973 audio frame is bps. Recommended for surround-sound high definition movies.
Representing Formats for IEC 61937 Transmissions
Maximum rate in an audio frame is bps. With the increase in media storage devices that require compressed audio formats, applications must identify, describe, and use a variety of new encoded audio content for transmitting content from PCs to devices such as HDMI or DisplayPort receiver.
The characteristics of a decoded audio stream on the target device. The characteristics of an encoded audio stream to be transmitted. To represent an encoded audio stream to be transmitted over an IEC compatible interface, 6137 application must provide: The new structure explicitly specifies the effective number of channels, sample size, and data rate of a non-PCM format.
IEC /AMD | IEC Webstore
When Dolby Digital Plus content is transmitted over IECthe link-sampling rate must be four times the sampling rate of the content. Dolby Digital Plus supports content sample rates of 32 KHz, Recommended for surround-sound standard definition movies.
Based on the information in this structure, a user or an application might have difficulty inferring the quality level of the non-PCM stream.
However, this structure is also not adequate in describing the stream for IEC transmissions because it was intended to represent a single set of characteristics and used for uncompressed, multi-channel PCM data. Since Dolby MAT 2. The GUIDs for the compressed audio formats that are not supported by the HD audio class driver and can be implemented by third-party solutions are listed in the following table.
The GUIDs for the compressed audio formats that are available as standard IEC encoded audio formats are listed in the following table. To represent an encoded audio stream to be transmitted over an IEC compatible interface, an application must provide:. The GUIDs for the compressed audio formats that are transmitted in high bit-rate audio sample packets are listed in the following table.