ieee 802.15-08-0789-00-004e submission: home audio application november 11 2008 rolfe,...
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IEEE e Submission: Home Audio Application November Rolfe, SahinogluSlide 3 Characteristics of Multi-channel Audio Requires synchronization as perceived by the user –Audio streams with Video stream –Of each speaker placement –Transmission Compensation Data rate: < 1Mbps per stream –Dolby DVD 5.1 soundtrack = 448Kbps (typical) –Dolby Digital Plus: audio 96Kbps < DD+ < 6Mbps –1.5Mbps < DTS-HD 6 Mbps –Aggregate (5.1) data rates! –MP3 CD “equivalent” = 64Kbps per stream (128Kbps stereo)TRANSCRIPT
November 11 2008
Rolfe, SahinogluSlide 1
IEEE 802.15-08-0789-00-004e
Submission: Home Audio Application
Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)
Submission Title: [Home Audio Application]Date Submitted: [18 March 2008]Source: [Benjamin Rolfe] Company [Blind Creek Associates]
[Zafer Sahinoglu] Company [MERL]Address []Voice:[], E-Mail: [[email protected], [email protected]]Re: []Abstract: Describes characteristics of home audio application
Purpose: Stimulate discussion in the task group 15.4e
Notice: This document has been prepared to assist the IEEE P802.15. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein.Release: The contributor acknowledges and accepts that this contribution becomes the property of IEEE and may be made publicly available by P802.15.
November 11 2008
Rolfe, SahinogluSlide 2
IEEE 802.15-08-0789-00-004e
Submission: Home Audio Application
Set Top(Source)
Center AudioVideo
Right Rear
Right Audio
Left Audio
Left Rear
AV Router
Video via HDMI, 15.3c, WiMedia, 802.11-VHT,Etc.
Audio via 802.15.4a +
802.15.4e
November 11 2008
Rolfe, SahinogluSlide 3
IEEE 802.15-08-0789-00-004e
Submission: Home Audio Application
Characteristics of Multi-channel Audio
• Requires synchronization as perceived by the user– Audio streams with Video stream– Of each speaker placement– Transmission Compensation
• Data rate: < 1Mbps per stream– Dolby DVD 5.1 soundtrack = 448Kbps (typical)– Dolby Digital Plus: audio 96Kbps < DD+ < 6Mbps– 1.5Mbps < DTS-HD 6 Mbps– Aggregate (5.1) data rates!– MP3 CD “equivalent” = 64Kbps per stream (128Kbps stereo)
November 11 2008
Rolfe, SahinogluSlide 4
IEEE 802.15-08-0789-00-004e
Submission: Home Audio Application
Synchronization
• Lip sync error– The timing of rendering the video part may deviate
from that of rendering the audio• ITU-R BT.1359 states that thresholds of
timing for viewer detection are +45ms to -125ms, and the thresholds of acceptability are about +90ms to -185ms.
• According to ATSC Implementation Subcommittee IS-191 the sound program should never lag video program by more than 45ms±15ms.
November 11 2008
Rolfe, SahinogluSlide 5
IEEE 802.15-08-0789-00-004e
Submission: Home Audio Application
Transmission Considerations
• Broadcast– ACK not necessary – no retransmission– Not efficient for audio (duplicates stream)– OK for control channel, not ideal for audio data
• Uni-cast (sequential per channel)– Scheduled transmission– Compensation for schedule timing– ACK not required
November 11 2008
Rolfe, SahinogluSlide 6
IEEE 802.15-08-0789-00-004e
Submission: Home Audio Application
MAC and PHY Features
• Location awareness (4a) useful– Auto-configuration (Channel assignment for
example)• QoS: Scheduled deliver (GTS) for each
speaker– Deterministic delays within latency tolerance– Guaranteed data rate (per channel)
• Modest data rates (but not trivial)
November 11 2008
Rolfe, SahinogluSlide 7
IEEE 802.15-08-0789-00-004e
Submission: Home Audio Application