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BS IEC 61937-14:2017 Digital audio. Interface for non-linear PCM encoded audio bitstreams applying IEC 60958 - Non-linear PCM bitstreams according to the AC-4 format, 2017
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- CONTENTS
- FOREWORD
- 1 Scope
- 2 Normative references
- 3 Terms, definitions and abbreviated terms [Go to Page]
- 3.6 Abbreviated terms
- 4 Mapping of the audio bit stream on to IEC 61937-1 [Go to Page]
- 4.1 General
- 4.2 AC-4 burst-info
- Tables [Go to Page]
- Table 1 – Shorthand notation for fractional frame rates
- 5 Format of AC-4 data-bursts [Go to Page]
- 5.1 General
- 5.2 Pause data-burst
- 5.3 Audio data-burst [Go to Page]
- 5.3.1 The AC-4 data
- Table 2 – Fields of burst-info
- Table 3 – Repetition period of the Pause data-bursts
- Figures [Go to Page]
- Figure 1 – AC-4 data-burst
- Table 4 – Data-type-dependent information for AC-4
- Table 5 – AC-4 base sampling frequency, AC-4 audio framerate and corresponding AC-4 data-burst repetition period
- Table 6 – AC-4 data-burst sequence and repetition period variance at 29,97, 59,94 and 119,88 fps
- Table 7 – AC-4 data-burst: meaning of Pc bits 8 to 11 at an IEC 60958 frame rate of 48 kHz
- Table 8 – AC-4 data-burst: meaning of Pc bits 8 to 11 at an IEC 60958 frame rate of 44,1 kHz [Go to Page]
- 5.3.2 Latency of the AC-4 decoder
- Figure 2 – Latency of AC-4 decoding
- Table 9 – Maximum burst-length values per AC-4 data-burst repetition period [Go to Page]
- 5.3.3 The AC-4 HBR4 data
- Figure 3 – AC-4 HBR4 data-burst
- Table 10 – Data-type-dependent information for AC-4 HBR4
- Table 11 – AC-4 base sampling frequency, AC-4 audio frame rate and corresponding AC-4 HBR4 data-burst repetition period
- Table 12 – AC-4 HBR4 data-burst sequence and repetition period variance at 29,97, 59,94 and 119,88 fps
- Table 13 – AC-4 HBR4 data-burst: meaning of Pc bits 8 to 11 at an IEC 60958 frame rate of 192 kHz
- Table 14 – AC-4 HBR4 data-burst: meaning of Pc bits 8 to 11 at an IEC 60958 frame rate of 176,4 kHz [Go to Page]
- 5.3.4 Latency of the AC-4 HBR4 decoder
- Figure 4 – Latency of AC-4 HBR4 decoding
- Table 15 – Maximum burst-length values per AC-4 HBR4 data-burst repetition period [Go to Page]
- 5.3.5 The AC-4 HBR16 data
- Figure 5 – AC-4 HBR16 data-burst
- Table 16 – Data-type-dependent information for AC-4 HBR16
- Table 17 – AC-4 base sampling frequency, AC-4 audio frame rate and corresponding AC-4 HBR16 data-burst repetition period
- Table 18 – AC-4 HBR16 data-burst sequence and repetition period variance at 29,97, 59,94 and 119,88 fps
- Table 19 – AC-4 HBR16 data-burst: meaning of Pc bits 8 – 11 at an IEC 60958 frame rate of 768 kHz
- Table 20 – AC-4 HBR16 data-burst: meaning of Pc bits 8 to 11 at an IEC 60958 frame rate of 705,6 kHz [Go to Page]
- 5.3.6 Latency of the AC-4 HBR16 decoder
- Table 21 – Maximum burst-length values per AC-4 HBR16 data-burst repetition period [Go to Page]
- 5.3.7 The AC-4 LD data
- Figure 6 – Latency of AC-4 HBR16 decoding
- Figure 7 – AC-4 LD data-burst
- Table 22 – Data-type-dependent information for AC-4 LD
- Table 23 – AC-4 base sampling frequency, AC-4 audio frame rate and corresponding AC-4 LD data-burst repetition period [Go to Page]
- 5.3.8 Latency of the AC-4 LD decoder
- Table 24 – AC-4 LD data-burst sequence and repetition period variance at 119,88 fps
- Table 25 – AC-4 LD data-burst: meaning of Pc bits 8 to 11
- Table 26 – Maximum burst-length values per AC-4 data-burst repetition period
- Figure 8 – Latency of AC-4 LD decoding
- Figure A.1 – An AC-4 sync frame
- Annex A (normative) AC-4 sync frame [Go to Page]
- Table A.1 – AC-4 sync frame syntax
- Table A.2 – framesize()
- Table A.3 – AC-4 syncword values [Go to Page]
