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COPYRIGHT© 2018 Intelligent Steward Co., Ltd.

All rights reserved. No part of this document may be modified, transmitted, transcribed, or

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Intelligent Steward Co., Ltd.

TRADEMARKS

ROOBO is a trademark of Intelligent Steward Co., Ltd. All other trademarks and registered

trademarks are property of their respective companies.

DISCLAIMER

Intelligent Steward Co., Ltd. owns the right to make improvements and/or changes in this

document at any time.

ROOBO provides this product to help accelerate the development of customizable in-home

assistants, in-car assistants, smart speaker, IoT devices, or other voice-enabled devices, but

not for other purposes.

Figures, photos, schematics and other information are included in this document to show the

technical specifications and/or tools instructions. If interested in mass production, please

contact ROOBO to obtain additional documents that require an NDA. ROOBO makes no

representations or warranties with respect to the accuracy or completeness of the contents

presented in this document.

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ROOBO Dev Kits for Microsoft Speech Services

Complete, end-to-end system reference designs

Smart Audio Circular 7-Mic / Star 4-Mic Dev Kit

Introduction

This Circular 7-Mic array Dev Kit is a pre-tuned end-to-end reference design that enables the

commercial device manufacturers to efficiently build high-quality speech enabled devices

using Microsoft Speech Services. Developers can integrate the Microsoft Speech Services into

smart speakers, set-top boxes, and other IoT devices with this kit and leverage premium

Microsoft voice recognition technology. It can also be easily configured into a Star 4-Mic array

by disabling 3 mics, for evaluating it as a lower cost device.

With the Microsoft Speech Devices SDK, it enables a range of advanced features such as

- Multi-mic array, noise suppression, echo cancellation.

- Customizable Key Word Spotting (English only).

- Integration with the world-class Microsoft Speech Services and Bot Framework, and more.

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Specification

•CPU: Qualcomm APQ8009 Quad core A7 1.1GHz CPU •GPU: Adreno304 •OS: Android 5.1 •Memory：LPDDR3+eMMC, 1GB + 8GB •Wireless Network: IEEE 802.11 b/g/n, WI-FI 2.4G, BT 4.0 •Power Supply: 12V 1.5A DC input, automatic power protection •Interface: USB device 2.0.

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In the Box •1x 6+1 digital microphone array board

•2x mainboards held by acrylic stand

•1x Gain antenna（fixed in the kit）

•1x Power adapter

Circular 7-Mic/ Star 4-Mic Array Specs

•Array Type: 7 circular array (6+1)

•Mic Qty: 7 digital MEMS microphone（ I2S）

•Dimension: Mics are placed horizontally

and evenly in a circle and microphone ports

face upward, the array radius is 42.5mm

•Wakeup Distance: <10m

•Listening Range: <5m (Room environment)

•Signal to Noise Ratio: SNR > 65dB

•Work Temperature: 0~40℉

•Sampling Rate：16K

•Sampling Accuracy：16Bit

•Sensitivity:> -26dBV @94dB 1kHz

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Circular 7-Mic Array Board Layout

Mic Array Board Sample and Layout

Description

Digital MEMS Microphone （Pick up the audio from bottom，Sensitivity：-26dB ）

ADC （I2S interface, 24bit ADC）

FPGA （Used to pack data）

Audio output （Pin pitch 0.5mm, 24 pins, Connected to core board）

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Core Board Sample and Layout

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Description

APQ8009 Core （Android core board with memory and wifi ）

Antenna Terminal （2.4GHz wifi antenna terminal）

Speaker （Supply Power is 12V，THD+N = 10%，6Ω，12W）

Audio PA （Audio Power amplifier）

USB Debug Interface （USB 2.0 Device）

Microphone Board Connector （Pin pitch 0.5mm, 24 pins, Connected to mic array board）

Power Connection Board Connector （Pin pitch 0.5mm, 24 pins, Connected to power

connection board）

TF card socket （Insert TF card）

Ref Signal Filter （Anti-Aliasing filter for reference signal）

Power Connection Board Sample and Layout

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Description

Power terminal （DC：12V/1.5A）

DCIN （Test Point for Negative power supply）

DCIN_M （Test Point for positive power supply）

Core Board Zif Connector （Pin pitch 0.5mm, 24 pins, Connected to core board）

Audio Data Path