Post on 15-Jun-2018
Confidential and Propriety
503 InnoValley E Bldg., 255 Pangyo-ro, Bundang-gu, Seongnam-si, Gyeonggi-do, Korea
Tel: +82-31-8018-7334 Fax: +82-31-8018-7330
email : jay@radsone.com
This document contains confidential information that is proprietary to RADSONE Inc.
No part of its contents may be copied, disclosed, or conveyed to any party in
any manner whatsoever without prior written permission from RADSONE Inc.
Copyright © 2016 by RADSONE Inc. All rights reserved.
Bluetooth 24bit Audio
Jay Yoo and Woo-Suk Lee
Radsone Inc.
Confidential and Propriety
• Motivation
• Comparing Wi-Fi and Bluetooth Audio
• Bluetooth 24bit technology
– Problem and Solution
• Radsone examples
– Analog gain/differential Bluetooth 24bit headphones
– Power efficient Bluetooth 24bit speakers
• Conclusion
Overview
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• More wireless audio products are proliferating
• Especially, Bluetooth audio market grows rapidly
– About 40 % CAGR up to 2020, 20~30 B USD
• Bluetooth headset market is also growing. E.g. LG
Tone+ headset sells millions per year
• In Bluetooth, market demands more quality sound
• 2016 will be the turning point of Bluetooth sound
• Should Hi-Fi makers prepare this wave of Bluetooth?
Introduction and Motivation
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High quality wireless audio should be difficult?
No options for easy and high quality solution?
DLNA, Cast for audio, AllPlay, Play-Fi …
High quality, but too many techs and difficult to use
Smartphone OS API level support
Convenient but low quality
Wireless audio
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Major changes in Bluetooth audio 2016
Apple iPhone7
Removes 3.5mm output
Major players joins in Bluetooth 24bit
Qualcomm, Sony, Samsung
Bluetooth 24bit will be game changer!!
Easy usability + 24bit high quality + Apple’s impact
Reportedly 3.5mm will be
removed in iPhone7
Apple already registered
Trademark ‘AirPods’
Sony LDAC/Samsung UHQ
24bit Bluetooth codec
Qualcomm CSR
Announces ‘aptX HD’
at CES 2016
Big opportunity for Bluetooth
Headphone/speaker
aptX HD will be free
for Smartphones;
Enabled by software update
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LG G5
aptX HD encoder
World first product using aptX HD
LG Tone Platinum (headset)
aptX HD decoder
- Qualcomm did not release aptX HD officially yet.
- Encoder will be included in Snapdragon for Source device (under development).
- Sink device development tool ADK 4.2 will be released this September.
** For LG’s headset, Radsone developed software using pre-released aptX HD decoder
Already in production from
March, 2016
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• aptX HD is software codec for Bluetooth
• aptX HD encoder is for Bluetooth source device
• aptX HD decoder is for Bluetooth sync device
• aptX HD encoder license is free!
• Almost Android smartphones can be upgraded freely – No information about whether Apple will use it or not
• aptX HD decoder license fee will be under $1
• Currently CSR8675 is the only chip supporting aptX
HD decoder for Bluetooth sync device
Qualcomm Bluetooth 24bit
CSR8675 is a
Qualcomm
Bluetooth chip
with aptX HD
decoder
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• Wider dynamic range complementing playback of Hi Res audio
content
• 24bit audio resolution maintained end to end.
• SNR of 129dB (cf. aptX 93dB)
• Lower THD benefits playback of standard resolution music libraries
• Moderately increased bit rate (576kbps) compared with classic
aptX (384kbps)
• aptX HD is aimed at high end stereo headsets & wireless speakers
in a point-point application
• aptX HD licensing currently includes classic aptX for Bluetooth
ensuring backwards compatibility
aptX HD
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CSR8675 chip for Sync device
6.5 x 6.5 x 1.0
mm,112-pin
BGA
Pin compatible
with CSR8670
Increase DSP
performance
up to 120 MIPS
(8670: 80MIPS) On chip DAC
still 16bit Increased MIPS allows for more audio processing algorithms
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• CSR8675 still uses 16bit on-chip DAC
• Actually downgrades at analog converting stage!
• However, it supports 24bit digital output
• So, there should be some engineering to make full 24bit audio path
• CSR8675 digital output + external DAC required for Hi-Fi headphones
and speakers
CSR8675 is not enough for Hi-Fi
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24bit
Qualcomm BT 24bit chip
24bit aptX HD decoder
16bit
On-chip DAC 16bit
24bit aptX HD encoder
Problem
24bit
Qualcomm BT 24bit chip
24bit aptX HD decoder
24bit
On-chip DAC 16bit
24bit aptX HD encoder
Solution
24bit DAC
External 24bit DAC
Problem and Solution
DAC Power off on-chip DAC is possible
when using external DAC
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Qualcomm CSR BT 24bit chip
24bit DAC
Clock Power
aptX HD decoder + Radsone DCT
24bit aptX HD
BT 24bit
How to make a better solution
• Bit clock from CSR chip has a little jitter. So, independent clock generation
is necessary for jitter free design
• Also elaborate power scheme is required for better performances
• Even better if consider high quality audio processing using available MIPS
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Examples (1)
• For full 24bit Bluetooth headphones
• Radsone works with several hi-fi audio makers in Japan, Korea, US
• Productions scheduled during second half this year
• Evaluation board available from Radsone Inc.
• Analog volume control, dual DACs for differential outputs,
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Examples (2)
• For full 24bit Bluetooth speakers
• Evaluation board available from Radsone Inc.
• 8675 + External DAC + Power efficient output stage
• Speaker calibration features
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LG G5
(24bit source via aptX HD)
Full 24bit Bluetooth
sync demo board
Demo
3.5mm Heaphone
Available at Radsone (Hall4, V18)
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• Bluetooth audio is most fast growing sector in audio businesses
• Bluetooth is not any more low quality solution
• Qualcomm Bluetooth 24bit aptX HD codecs will be available this year
• So, 2016 will be a turning point in Bluetooth sound quality
• Radsone is a partner company of Qualcomm and the first company developed Bluetooth 24bit software for LG Tone Platinum.
• More over, Radsone is licensing its sound improvement algorithm DCT to several vendors. DCT is a registered IP in Qualcomm Bluetooth
• Also, Radsone has already prepared Bluetooth full 24bit module for Hi-Fi headphone makers. We’re ready to support Hi-Fi makers.
• Catch this big change!
Conclusion