DICOM PS3.5 2021b - Data Structures and Encoding

A.10 : SMPTE ST 2110-30 PCM Audio Transfer Syntax (Current)
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## A.10 : SMPTE ST 2110-30 PCM Audio Transfer Syntax

This Transfer Syntax is used in a DICOM-RTV Metadata Flow in order to describe the accompanying SMPTE ST21110-30 Audio Flow.

DICOM Attributes

- Number of Waveform Channels (003A,0005) is limited to 15

- Number of Waveform Samples (003A,0010) is limited to 96 (1ms at 96 kHz)

- Sampling Frequency (003A,001A) shall either be 44100, 48000 or 96000

- Waveform Bits Stored (003A,021A) shall either be 16 or 24

- Waveform Bits Allocated (5400,1004) shall either be 16 or 24

- Waveform Sample Interpretation (5400,1006) shall either be US, SS or OB

Table A.10-1. ST 2110-30 and DICOM sampling frequency

ST 2110-30 Sampling Frequency | Sampling frequency(0003,001A)
--- | ---
44.1 kHz | 44100
48 kHz* | 48000
96 kHz | 96000

### Note

* 48 kHz is recommended by SMPTE

Table A.10-2. Waveform Sample Interpretation

Bit Depth | Waveform Bits Stored (003A,021A) | Waveform Bits Allocated (5400,1006) | Waveform Sample Interpretation (5400,1006) | Wave Sample Interpretation meaning
--- | --- | --- | --- | ---
16 | 16 | 16 | SS | signed 16-bit linear
16 | 16 | 16 | US | unsigned 16-bit linear
24 | 24 | 24 | OB | 24 bit linear

Table A.10-3. Example of Number of Waveform Samples for 48kHz for basic Audio (Mono or Stereo)

Bit Depth | Waveform Bits Stored (003A,021A) | Numbers of Waveform Channels (003A,0005) | Number of Waveform Sample (003A,0010) | Resulting packet Length (1ms)
--- | --- | --- | --- | ---
16 | 16 | 1 | 48 | 96
24 | 24 | 1 | 48 | 144
16 | 16 | 2 | 48 | 192
24 | 24 | 2 | 48 | 288

[SMPTE ST 2110-30] restricts the audio Flow:

- Sampling frequency is either 44.1 kHz, 48 kHz or 96 kHz, 48 kHz being the recommended value

- Coding scheme is either L16 (16-bit linear) or L24 (24-bit linear)

- Packet time should be 1ms (but could get down to 125 Âµs)

- Number of Waveform Channels is limited to 15

A DICOM Transfer Syntax for SMPTE ST 2110-30 PCM Digital Audio shall be identified by a UID value of:

- 1.2.840.10008.1.2.7.3 corresponding to the SMPTE ST 2110-30 Professional Media over IP Networks: PCM Digital Audio.

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DICOM PS3.5 2021b - Data Structures and Encoding