IEC 60958-5 pdf – Digital audio interface – Part 5: Consumer application enhancement
1 Scope
This part of IEC 60958enhances the consumer application of the interface for theinterconnection of digital audio equipment defined in lEC 60958-1 and IEC 60958-3, introducing:
-multichannel;
multi-stream;high-resolution;
– multimedia extension;- related applications.
NOTE IEC 60958-3 specifies a consumer application to carry stereophonic programmes with a resolution of up to24 bits per sample. This part of IEC 60958 enhances the application,allowing programmes with up to 64 channels,64 bits per sample,and two simultaneous streams.
2Normative references
The following documents are referred to in the text in such a way that some or all of their contentconstitutes requirements of this document. For dated references, only the edition cited applies.
For undatedreferences,the latestedition of the referenced document(including anyamendments) applies.
IEC 60958-1:20— 1,Digital audio interface – Part 1: General
IEC 60958-3:20— 2, Digital audio interface – Part 3: Consumer applications
IEC 62574:2020， Audio，video and multimedia systems – General channel assignment ofmultichannel audio
ISO/IEC 23001-8:2016, Information technology – MPEG systems technologies – Part 8: Coding-independent code points3
ITU-R BS.2094-1:2017，Common definitions for the audio definition modelITU-R BS.2051-2:2018,Advanced sound system for programme production
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and lEC maintain terminological databases for use in standardization at the followingaddresses:
. IEC Electropedia: available at http://www.electropedia.orgl
. Iso Online browsing platform: available at http://www.iso.orglobp
3.1
one-bit audio
one-bit length audio data stream
Note 1 to entry: A one-bit audio data stream can be directly played back through the analogue low-pass fiter bit bybit (MSB first).
3.2
high-precision multi-bit linear audio
linear PCM audio data longer than 25 bits length per sample
Note 1 to entry: This document supports 32-and 64-bit lengths.3.3
sampling frequency
frequency of the samples representing an audio signal.
Note 1 to entry. When more than one signal is transmitted through the same interface, the sampling frequenciesare identical.
[SOURCE: IEC 60958-1:20—,3.1]
3.4
audio sample word
value of a digital audio sample
Note 1 to entry: Representation is linear in 2’s complement binary form.
Note 2 to entry. Positive numbers correspond to positive analogue voltages at the input of the analogue-to-digitalconverter (ADC).
[SOURCE: IEC 60958-1: 20—,3.2]
3.5
channel status
data carrying, in a fixed format, information associated with each main data field channel, whichis decodable by any interface user.
Note 1 to entry. IEC 60958-3 specifies the mode 0 channel status format for digital audio equipment for consumeruse,
3.6
preamble
specific patterns used for synchronization.
Note 1 to entry: There are three different preambles: “B”; “M”; and “W”.
[SOURCE: IEC 60958-1:20—, 3.8, modified – Modification of the Note to entry.]
3.7
sub-frame
fixed structure used to carry information
[SOURCE: IEC 60958-1:20—, 3.9]
3.8
frame
sequence of two successive and associated sub-frames
[SOURCE: IEC 60958-1:20—, 3.10]
3.9
block
group of 192 consecutive frames
Note 1 to entry: The start of a block is designated by a special sub-frame preamble.
[SOURCE: IEC 60958-1:20—, 3.11]
3.10
channel number
number that shows channel order in two-channel operation mode
3.11
channel label ID
label of ID
[SOURCE: IEC 62574:2020, 3.73]
3.11.1
multichannel number
number that identifies multichannel addressing
Note 1 to entry: Same as IEC 62574 channel number
3.12
multichannel group
group composed of one or two multichannel subgroups
3.13
multichannel count
count of channels in a multichannel group
3.14
multichannel subgroup
subgroup, in a multichannel group, composed of several multichannel
Note 1 to entry: Multichannel subgroup A is set according to multichannel configuration.
Note 2 to entry: Multichannel subgroup B is set according to multichannel map.
3.15
multichannel configuration
configuration of multichannel addressing
3.16
multichannel order
order of multichannel in a multichannel group
3.17
multichannel map
map of multichannel selections
4 Interface format
The interface format as defined in IEC 60958-1 and IEC 60958-3 shall be used unless otherwise specified in this document.
5 Operation modes General 5.1 IEC 60958-1 specifies single- and two-channel operation modes. This document introduces several new operation modes based on the same interface format of IEC 60958-1 without the pre-emphasis function defined in IEC 60958-3. Channel status information identifies these modes in operation. This document shares the information with IEC 60958-1 and IEC 60958-3 and specifies new usages.