Transcript
Bluetooth 24bit Audio Jay Yoo and Woo-Suk Lee
Radsone Inc. 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. 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 :
[email protected]
Confidential and Propriety
Overview • 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
Confidential and Propriety
Introduction and Motivation • 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?
3
Confidential and Propriety
Confidential and Propriety. RADSONE Inc.
High quality wireless audio should be difficult?
Wireless audio
DLNA, Cast for audio, AllPlay, Play-Fi … Smartphone OS API level support Convenient but low quality High quality, but too many techs and difficult to use
No options for easy and high quality solution?
4
Confidential and Propriety. RADSONE Inc.
Major changes in Bluetooth audio 2016 Apple iPhone7
Major players joins in Bluetooth 24bit
Removes 3.5mm output
Qualcomm, Sony, Samsung
Reportedly 3.5mm will be removed in iPhone7
Sony LDAC/Samsung UHQ 24bit Bluetooth codec Qualcomm CSR Announces ‘aptX HD’ at CES 2016
Apple already registered Trademark ‘AirPods’
Big opportunity for Bluetooth Headphone/speaker
aptX HD will be free for Smartphones; Enabled by software update
Easy usability + 24bit high quality + Apple’s impact
Bluetooth 24bit will be game changer!! 5
Confidential and Propriety. RADSONE Inc.
World first product using aptX HD Already in production from
March, 2016
LG G5
LG Tone Platinum (headset)
aptX HD encoder
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
6
Confidential and Propriety. RADSONE Inc.
Qualcomm Bluetooth 24bit • 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
7
CSR8675 is a Qualcomm Bluetooth chip with aptX HD decoder
Confidential and Propriety. RADSONE Inc.
aptX HD • 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
8
Confidential and Propriety. RADSONE Inc.
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 9
Confidential and Propriety. RADSONE Inc.
CSR8675 is not enough for Hi-Fi • 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
10
Confidential and Propriety. RADSONE Inc.
Problem and Solution 24bit aptX HD encoder
Qualcomm BT 24bit chip
24bit
Problem
16bit
24bit aptX HD decoder On-chip DAC 16bit
24bit aptX HD encoder
Solution
Qualcomm BT 24bit chip
24bit
External 24bit DAC 24bit
24bit aptX HD decoder
24bit DAC
On-chip DAC 16bit DAC Power off on-chip DAC is possible when using external DAC 11
Confidential and Propriety. RADSONE Inc.
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
aptX HD
Qualcomm CSR BT 24bit chip
24bit
BT 24bit
24bit DAC
aptX HD decoder + Radsone DCT
Clock
12
Power
Confidential and Propriety. RADSONE Inc.
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,
13
Confidential and Propriety. RADSONE Inc.
Examples (2) • • • •
14
For full 24bit Bluetooth speakers Evaluation board available from Radsone Inc. 8675 + External DAC + Power efficient output stage Speaker calibration features
Confidential and Propriety. RADSONE Inc.
Demo Available at Radsone (Hall4, V18)
LG G5 (24bit source via aptX HD)
15
Full 24bit Bluetooth
3.5mm Heaphone
sync demo board
Confidential and Propriety. RADSONE Inc.
Conclusion • • • •
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!
16
Confidential and Propriety. RADSONE Inc.
Thank You! Contact: Jay Yoo (
[email protected] )
Confidential and Propriety
