原标题：基于Qualcomm CSR8670及Lofelt haptic震动蓝芽耳机方案

　　还记得聆听演唱会或演奏会那种音场的震撼, 低频音波打在身上的感觉吗? 现在你不需要购票参加演唱会或演奏会了, 只需要一只Qualcomm CSR8670加上Lofelt haptic actuator以及独家的DSP处理技术的耳机即可让你享受这种亲临演唱会演奏会的震撼及感动.

　　CSR8670具备相当优异的96dB stereo codec DAC输出, 而Lofelt haptic actuator则是经由CSR8670 I2S输出到Lofelt main board DSP处理后再透过class D audio amplifier推动.

　　音乐信号经由CSR8670 analog path输出到speaker的同时Lofelt haptic actuator走I2S这个digital path来产生跟着音乐节拍震动的效果. 就是这样的工作模式让你享受高音质音乐的同时又能被如临演唱会或演奏会现场的低频音波所震撼感动.

　　场景应用图

　　产品实体图

　　展示板照片

　　方案方块图

　　Lofelt haptic actuator

　　核心技术优势

　　The headset equip with haptic vibration feature when listen to music

　　-HW:

　　.Dynamic wide-band haptic actuator

　　.Up to 7.1G force and fast reaction time

　　.High mechanical reliability and silent operation

　　-SW:

　　.Patented software processing creates haptic output from any audio signal

　　.Adaptive algorithm with user-adjustable intensity control

　　.Efficient real-time processing with less than 6ms latency(audio to haptic)

　　方案规格

　　.State of the art on haptic technology to enhance user experience on music, gaming and movie

　　.Music stream by bluetooth and wired audio

　　.Advanced DSP algorithms convert audio to optimal wideband haptic signal with ultra-low latency

　　【CSR8670】

　　CSR8670 Bluetooth Audio SoC

       技术文档：csr8670-product-brief.pdf

　　Embedded Flash Solution for Bluetooth Audio Applications

　　The CSR8670 SoC is an audio system-on-chip (SoC) solution with wireless connectivity, embedded flash memory and integrated capacitive touch sensors, enabling the creation of feature rich home entertainment and wearable audio products with a highly compelling user experience and superior audio performance.

　　CSR8670, Qualcomm Kalimba, Qualcomm aptX, Qualcomm cVc and Qualcomm TrueWireless are products of Qualcomm Technologies, Inc., and/or its subsidiaries.

　　Specifications

　　Bluetooth

　　Bluetooth Version: Bluetooth 5.0

　　Bluetooth Radio: +10dBm maximum output power (typical), -90dBm receiver sensitivity (basic rate, typical)

　　USB

　　USB Support: Supports USB charger detection

　　USB Version: USB 2.0 (Full Speed)

　　General Audio

　　Audio Technology: Qualcomm TrueWireless™ Technology, Qualcomm® Broadcast Audio technology, Qualcomm® aptX™ audio technology, Qualcomm® cVc™ audio technology, 16 bit audio data path

　　Qualcomm® aptX™ playback support: aptX Classic, Qualcomm® eXtension program

　　Analog Microphone Input: 2 analog mics/line inputs (up to 96kHz sample rate)

　　Digital Microphone Input: 6 digital mics

　　Analog DAC output: 2 analog DAC channels (up to 192kHz sample rate)

　　Microphone Bias Generator: 2 microphone bias generators

　　DSP

　　DSP Technology: Qualcomm® Kalimba™ DSP

　　DSP Clock Speed: 80 MHz

　　MCU

　　MCU Clock Speed: 80MHz

　　Power Management

　　Maximum Input Voltage: 3.3V

　　Charging

　　Maximum Current: 200 mA on chip, 500 mA with external transistor

　　Memory

　　Flash: 16MB, Up to 64 MB external flash

　　RAM: 56KB RAM

　　Interface

　　Supported Interfaces: Master I²C, 1x PCM/I²S, 1x SPDIF, UART

　　Input/Output

　　ADC: 2 ADCs

　　DAC: 2 DACs

　　Maximum PIOs: 29

　　PWM (LED): 3

　　Input

　　Touch Sensor Inputs: 6 touch sensor inputs

　　Package

　　Package Type: VFBGA, WLCSP, 4.7 x 4.8 x 0.6 mm 0.5 mm pitch WLCSP, 6.5 x 6.5 x 1 mm 0.5 mm pitch VFBGA

　　Pitch: 0.5mm Pitch