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
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Number of Waveform Channels (003A,0005) is limited to 15
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Number of Waveform Samples (003A,0010) is limited to 96 (1ms at 96 kHz)
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Sampling Frequency (003A,001A) shall either be 44100, 48000 or 96000
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Waveform Bits Stored (003A,021A) shall either be 16 or 24
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Waveform Bits Allocated (5400,1004) shall either be 16 or 24
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Waveform Sample Interpretation (5400,1006) shall either be US, SS or OB
Table A.10-1. ST 2110-30 and DICOM sampling frequency
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ST 2110-30 Sampling Frequency
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Sampling frequency(0003,001A)
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44.1 kHz
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44100
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48 kHz*
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48000
|
|
96 kHz
|
96000
|
Note
* 48 kHz is recommended by SMPTE
Table A.10-2. Waveform Sample Interpretation
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Bit Depth
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Waveform Bits Stored (003A,021A)
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Waveform Bits Allocated (5400,1006)
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Waveform Sample Interpretation (5400,1006)
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Wave Sample Interpretation meaning
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|
16
|
16
|
16
|
SS
|
signed 16-bit linear
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|
16
|
16
|
16
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US
|
unsigned 16-bit linear
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|
24
|
24
|
24
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OB
|
24 bit linear
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Table A.10-3. Example of Number of Waveform Samples for 48kHz for basic Audio (Mono or Stereo)
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Bit Depth
|
Waveform Bits Stored (003A,021A)
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Numbers of Waveform Channels (003A,0005)
|
Number of Waveform Sample (003A,0010)
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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:
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Sampling frequency is either 44.1 kHz, 48 kHz or 96 kHz, 48 kHz being the recommended value
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Coding scheme is either L16 (16-bit linear) or L24 (24-bit linear)
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Packet time should be 1ms (but could get down to 125 µs)
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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 of: