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Description
ReSpeaker 4-Mic Circular Array for Raspberry PiReSpeaker 4 Mic Array for Raspberry Pi is a 4 microphone expansion board for Raspberry Pi designed for AI and voice applications. This means that you can build a more powerful and flexible voice product that integrates Amazon Alexa Voice Service, Google Assistant, and so on. This board is developed based on AC108, a highly integrated quad channel ADC with I2S TDM output transition for high definition voice capture. Besides, this 4 Mics version
ReSpeaker 4-Mic Array for Raspberry Pi is a 4 microphone expansion board for Raspberry Pi designed for AI and voice applications. This means that you can build a more powerful and flexible voice product that integrates Amazon Alexa Voice Service, Google Assistant, and so on.
This board is developed based on AC108, a highly integrated quad-channel ADC with I2S/TDM output transition for high definition voice capture. Besides, this 4-Mics version provides a super cool LED ring, which contains 12 APA102 programmable LEDs. With that 4 microphones and the LED ring, Raspberry Pi would have ability to do VAD(Voice Activity Detection), estimate DOA(Direction of Arrival) and show the direction via LED ring, just like Amazon Echo or Google Home.
Note
- Please note that the package does not contain Raspberry Pi.
- Please note that there are no any audio output interfaces on ReSpeaker 4-Mic Array for Raspberry Pi. It is only for voice capture. And you could use the headphone jack on Raspberry Pi for audio output.
Technical Details
| Dimensions | 65mm x 65mm x 9mm |
| Weight | G.W 20g |
| Battery | Not included |
| MIC | 4 analog microphones |
| LED | 12 APA102 programable RGB LEDs, connected to SPI interface |
| Raspberry Pi 40-Pin Headers | support Raspberry Pi Zero, Raspberry Pi 1 B+, Raspberry Pi 2 B and Raspberry Pi 3 B |
| AC108 | highly integrated quad-channel ADC with I2S/TDM output transition |
| Software Algorithm | VAD(Voice Activity Detection), DOA(Direction of Arrival) and KWS(Keyword Search) |
| Grove | 2 Grove Interfaces |
| Voice Capture Distance | 3 meters radius voice capture |
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4.4 ★★★★★
Based on 1668 reviews
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Product Reviews
★★★★★ 5
Compelling!
Format: Paperback
I loved this book. It is a personal, honest, beautiful account of walking the Camino, and I didn’t want it to end. The actual reality of walking the Camino is aptly portrayed in this open-hearted story. Angela’s unique turn of phrase, her outrageous humor, her vulnerability, the unrelenting pain, and the lessons learned are beautifully expressed, and are a testament to her endurance and to her Love. Angela has the true heart of a pilgrim, showing us that seeing with eyes of Love is all that matters. Bronwen Diana
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Reviewed in the United States on March 22, 2019
★★★★★ 4
Enjoyable and Uplifting
Format: Kindle
After reading this book, it came to me that this is different and maybe far more uplifting than the prior books I’ve read. It should have been my first book to read but alas, I’ve been reading about the Camino for over a decade. I enjoyed Angel’s perspective on the Camino but also how it affected her life.
If you’ve ever considered the Camino, read this one before you go, and then GO!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 23, 2024
★★★★★ 5
A Vicarious Adventure
Format: Kindle
I’ve read numerous books about the Camino, and most have been excellent, as was this one. The author captured the emotions during interactions with fellow pilgrims insightfully. Ranging from petty squabbles to jealousy to shared misery to elation—you were part of the experience. Easy to read, hard to put down, entertaining.
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Reviewed in the United States on May 4, 2022
★★★★★ 5
A Very Enjoyable Camino Pilgrimage
Format: Kindle
A detailed 40 day journal format of one pilgrims experience upon the Camino Frances. She revisits the various personalities she encountered along the way and discribes the tough terrain and weather challenges which in turn push her to the limits of her physical abilities. In the end, she perseveres and eventually finds a change in the hardness of her heart ...the Camino is known to do this.
Great book and I enjoyed it thoroughly...I purchased both the text and audio versions to read along. I highly recommend it for any potential pilgrims or for anyone seeking to enjoy a 800km hike in Northern Spain. Thanks for bringing me along!
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Reviewed in the United States on March 9, 2021
★★★★★ 5
Well Presented Concepts and Implementations (5th ed.)
Format: Paperback
Foreword: I have been running my own DNS servers on OpenBSD and FreeBSD for about 4 years. All of my previous DNS knowledge was obtained from the man pages and online tutorials.
The book is great because the example network used throughout the book is built upon, showing you how to "grow" your DNS with your expanding network. The design and implementation presented is priceless and covers some of my favorite topics: placement of slaves, hidden primaries, building root servers, split views, daisy-chaining, forwarders, partial-slaves, address maintenance issues, etc. The pros and cons of each setup are weighed and best practices are suggested. If you like a generous helping of diagrams, examples, and tables as a learning aid, you won't be disappointed.
One specific example of weighing the pros and the cons is presented on page 479 as follows:
"Could we have saved a few bucks on hardware by using our external authoritative nameservers as forwarders, too? Sure, but that would have presented a risk." After that statement, they proceed into all the details of "why."
There is adequate coverage on security. The authors preach defense in depth. An implementation example includes hiding your masters and only exposing bastion slaves. Securing communications between the masters and slaves is also covered in the security chapter using DNSSEC and TSIG. I think IPSec is another way to add a security layer, but that is probably another book.
After reading the book, I started to implement my new DNS infrastructure and found myself referring to the index often. It is fairly consummate, however, I found a few things missing, such as the $GENERATE statement. Also, some of the configuration details were lacking slightly. For example, the order in which ACL elements are processed and how negated elements affect the processing outcome. Another question I had was, what would happen if an ACL name is negated, and what if that ACL contained some negated elements. Well I found my answer by actually trying it and verifying with the canonical reference docs on isc.org.
I gave this book five stars because of its effectiveness in presenting the concepts and implementations of DNS using examples, good writing style, tables, and diagrams. If you're looking for the last 4 percent of the diminutive details of DNS, you will find it on isc.org.
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Reviewed in the United States on August 22, 2006
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