How to Develop a Loudspeaker for iPhone 5 with Digital Audio Interface Dr. John Oh Pulsus Technologies - The Association of Loudspeaker ...
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The Association of Loudspeaker Manufacturers & Acoustics
International presents
How to Develop a Loudspeaker
for iPhone 5 with Digital Audio Interface
Dr. John Oh
Pulsus Technologies
www.almainternational.org
Audio Interface of iPhone 5,
iPad, New iPad, iPod Touch
• Lightning connector 30-pin -> 8 pin
• New connector is an active component
with a chip inside
• Analog audio streaming is not
supported anymore
• New interface iAP2 has announced, and
older interface is now called iAP1
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Implication
• Existing docking speakers are not
compatible with iPhone 5
• Converter should be able to convert
USB audio to analog
• Existing analog docking solutions cannot
be used in the new designs
• iAP1 based digital docking solutions can
coexist with iAP2 for sometime.
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What is iAP2?
• Will replace iAP1
• iTunes control
• USB high-speed audio up to 24bit 192
KHz (iAP1 < 16bit 48KHz)
• Analog audio removed
• Both USB host and device mode (iAP1
only support device mode – iPhone is
USB device)
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Start Developing Speakers
for MFI
• Registered as a MFI developer
• Access MFI portal mfi.apple.com for
resources
• mfi.avnet.com for compo, such as
lightening connector, Apple
authentication processor
• Choose mfi audio development system
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What’s inside the new
speakers?
• MCU with USB audio interface (with iAP
Library)
• Apple authentication chip
• DSP for digital audio processing
• Audio CODEC
• Amplifier
• Alternative audio sources (Bluetooth,
FM Tuner, DAB , etc.)
www.almainternational.org
PS8645, all-in-one SoC
PS8645 = USB controller + MCU + audio DSP + PWM
modulator + peripherals
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System Configuration
General Docking Speaker
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• 8051-based microprocessor with 64kB RAM
• Audio inputs
- USB 2.0 full-speed host and device (selectively)
- 3 x stereo AUX and 1 microphone
- 2 x I2S
- 1 x SPDIF (PCM only)
• Supports 16~24bit, 8-kHz~96kHz audio streaming
• Dual asynchronous sample rate converter with jitter attenuation for low distortion
• Fixed audio DSP with 24bit, 192kHz sound processing
- 5-band/ch equalizer
- Digital crossover
- QXpanderⓇ: virtual surround
- Virtual bass
- TuubilizerⓇ : smoothly plays output over the dynamic range without clipping noise
- Loudness volume
• 4-ch nDDC (Digital-to-Digital Converter) with HD PWM correction
• Peripherals
- SPI, I2C, UART, JTAG, IR remote controller, real time clock controller, and 23 GPIOs
• Value-added functions:
- Source level detector for lower power consumption
- Device firmware update
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Development System
for Rapid Prototyping
USB
Power supply Speaker Optical AUX
(PC)
0
8-pin/30-pin
PS2022 8 connector
180
power amplifier
I2S in
1
Apple
authentication coprocessor
PS8645
www.almainternational.orgMain Features
• iAP2 ready
- Supports iAP1 and iAP2
- Supports USB host mode and USB device mode
• Better sound quality
- Full digital audio streaming and amplification
- Extensive audio DSP algorithms
• Low cost
- PS8645, all-in-one SoC for digital audio docks
• Faster time-to-market with much less engineering
- Development board for rapid prototyping
- 2.1ch Module that can be immediately used to produce 2.1ch iAP2
docking speakers
- Full SW library of iPod/iPhone/iPad dock functions and peripheral
interfaces
- Easy-to-use GUI SW development tool for real-time speaker tuning
and input configuration
www.almainternational.orgiAP2 ready
• iAP2 MFi Device
- USB device mode audio
- HID (Human Interface Device)
- Now Playing
- 16bit 32kHz / 44.1kHz / 48kHz
• iAP2 MFi Host
- HID
- Now Playing
- 24bit adaptive, 44.1kHz / 48kHz
www.almainternational.orgTechnical Specification
• Audio Input
- 8-pin/30-pin connector for iPod/iPhone/iPad
: Supports both iAP1, iAP2 host, and iAP2 device
- 1 stereo analog input (AUX)
- S/PDIF optical input (PCM only)
- I2S (optional)
• Speaker Output
- 2-ch full-range or two-way / 2.1ch
• Audio algorithms: QXpanderⓇ, Virtual bass, TuubilizerⓇ, Digital crossover
filter, 5-band EQ
• Display: 20 digits x 2rows character VFD
• User interfaces:
- Button: Standby, sound mode, volume -, volume +, play/pause, intput
- IR remote control
: Standby, volume -/+, mute, play/pause, previous/next, menu, arrow up/
down, arrow left/right, enter,
source input selection, PC to iPod link control, sound
• Supports Apple iPod authentication processor (2.0B / 2.0C)
• 8V - 17V single power operation
www.almainternational.org2.1ch module for immediate product
launch
• A finished design that can be immediately adopted to mass production
- No additional hardware development or programming is required
• Audio inputs
- 8-pin/30-pin connector for iPod/iPhone/iPad
: Supports both iAP1, iAP2 host, and iAP2 device
- 1 stereo analog input (AUX)
• Speaker Output
- 2.1-ch configuration: 10Wx2ch + 20Wx1ch (THD+N 1%)
• Audio algorithms: QXpanderⓇ, Virtual bass, TuubilizerⓇ, Digital crossover filter, 5-band EQ
• Display: 2 sets of LEDs for power mode and sound mode
• User interfaces
- Button : Standby, sound mode, volume -, volume +
- IR remote control
: Standby, volume -/+, mute, play/pause, previous/next, menu, arrow up/down, enter,
sound
• 15V/2.7A single power operation
• SNR: >90dB
• Small foot print: 120mm x 70mm (Main board)
www.almainternational.org2.1ch Reference Design
0
8 8-pin connector
1
PS2022
power amplifier 0 Apple 2.0c
Speaker 8 PS8645
PS2022
power amplifier 1
AUX Power supply
www.almainternational.org2.1ch Reference Design
www.almainternational.orgFirmware development
environment
• Provides a full library of iAP1 and iAP2 including
digital audio streaming, general purpose peripheral
interfaces, and authentication protocols
• SDK (Software Development Kit) with full library and
sample source code of all the functions
• Users can customize the firmware firmware:
- by adopting reference firmware released
- through Pulsus’ SW development support program
• Industry standard C-compiler
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PDK Development Env. for DSP
• System configuration and
real-time speaker tuning
without DSP programming
- Only through USB
connection to PC/Macs, no
specific equipment is
required
• Quick adjustment of
equalizer, crossover, and
sound processing
algorithms
www.almainternational.orgPDK
www.almainternational.orgPDK
www.almainternational.orgDynamic Loudness
www.almainternational.orgMulti-input multi-function high-end docking speaker
www.almainternational.orgSummary
• New iPhone 5 pure digital Interface
iAP2 has announced.
• Better sound quality through 24bit
digital audio interface enables
implementation of high quality audio
systems.
• New development system and SoC
architecture can significantly reduce
development time and cost.
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