xCORE ARRAY MICROPHONE details

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bhanuprakashbv
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xCORE ARRAY MICROPHONE details

Postby bhanuprakashbv » Wed Sep 06, 2017 10:15 pm

Hi,

I am planning to buy "xCORE ARRAY MICROPHONE". I am very new to this board. Please help me.
I have couple of doubts related to board. Could you please clarify below doubts.

1. What is the output of the board? Can I receive audio data through USB?
2. what is the sample depth? (number of bits per sample)
3. what is the sample rate of output?
4. Is it possible to select each microphone? what is the control over microphone?
5. Can I use the USB for reading the data?
6. Is USB only for power or for reading output from board as well?
7. What is USB Audio Class 2.0 support?

Thanks,
Bhanu
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andrew
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Postby andrew » Thu Sep 07, 2017 8:33 am

1. What is the output of the board?
It has a DAC that outputs stereo over the headphone jack

Can I receive audio data through USB?
Yes
2. what is the sample depth? (number of bits per sample)
32 bits from lib_mic_array
3. what is the sample rate of output?
48k->3k
4. Is it possible to select each microphone?
yes
what is the control over microphone?
?
5. Can I use the USB for reading the data?
Yes
6. Is USB only for power or for reading output from board as well?
Not just power
7. What is USB Audio Class 2.0 support?
bhanuprakashbv
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Postby bhanuprakashbv » Thu Sep 07, 2017 8:01 pm

Thank you Andrew !!!
I need more details. Could you please clarify.


1. What is the output of the board?
It has a DAC that outputs stereo over the headphone jack
<BHANU> Output can be through headphone or USB. Right?
<BHANU>This has 7mics, Will it output only stereo or 7 channel output? OR Stereo output for headphone jack & Multi channel output for USB?

2. what is the sample depth? (number of bits per sample)
32 bits from lib_mic_array
<BHANU> When I read the audio data through USB, Is it 32-bit data always or any other data depth(like 16-bit or 24-bit) ?

3. what is the sample rate of output?
48k->3k [color=#FF0000](Is it 3k or 384k?)

<BHANU> I read following statement "The system can be configured to generate PCM output at sample rates from 7.35kHz to 48kHz".
What is the difference between this sample rate and the sample rate provided by you?


4. Is it possible to select each microphone?
yes
<BHANU> How can I select microphone? Is there any physical button or some other way? Could you please explain more details.
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Ross
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Postby Ross » Tue Sep 12, 2017 10:36 am

<BHANU> Output can be through headphone or USB. Right?
<BHANU>This has 7mics, Will it output only stereo or 7 channel output? OR Stereo output for headphone jack & Multi channel output for USB?

7 mics transferred over usb, stereo audio output via USB to DAC.

<BHANU> When I read the audio data through USB, Is it 32-bit data always or any other data depth(like 16-bit or 24-bit) ?

This is configurable in the code
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andrew
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Postby andrew » Tue Sep 12, 2017 10:36 am

it looks like all the info you need is here: https://www.xmos.com/support/boards?product=20258

If you want to just connect to USB and use it as a 7 channel microphone then you can.
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Ross
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Postby Ross » Tue Sep 12, 2017 10:37 am

<BHANU> I read following statement "The system can be configured to generate PCM output at sample rates from 7.35kHz to 48kHz".
What is the difference between this sample rate and the sample rate provided by you?

Sorry I don't understand this question.

4. Is it possible to select each microphone?
yes
<BHANU> How can I select microphone? Is there any physical button or some other way? Could you please explain more details.

You could code this up if you desired, by default all mics are send via usb
bhanuprakashbv
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Postby bhanuprakashbv » Fri Sep 22, 2017 5:48 am

Thank you Ross. I ordered board. Once I start working on board, I will ask more questions :-).
Once again Thank you very much.

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