I am using a Circular Microphone Board that has 4 I2S outputs with 8 channels in total and getting this audio into a Beaglebone AI. I am able to input 2 channels and record (arecord) the audio right now with mcasp1_axr0 interface.
However I want to record the 8 channels now, so I need 4 interfaces and my question is: must these interfaces be mcasp1_axr0, mcasp1_axr1, mcasp1_axr2 and mcasp1_axr3. Or can they be for exaple, mcasp1_axr0, mcasp1_axr1, mcasp1_axr10 and mcasp1_axr11?
Thanks in advance
Related
How do I take 2 different audio inputs at the same time from a mobile?
I tried taking audio from my phone as primary mic and headphones as secondary mic but failed to take 2 different audio inputs
I have an WAV audio file with 3 channels: 2 for the sound (stereo) and 1 with short pulses to help record and synchronize with an external device (for a scientific experiment, not important).
The thing is: I have a sound card with 4 audio inputs and outputs, but when I try to play the file there is an error about the number of channels:
sounddevice.PortAudioError: Error opening OutputStream: Invalid number of channels [PaErrorCode -9998]
This occurs both with SoundDevice and Pyamge.play, and also when i added a 4th blank channel.
photo of the list of devices connected the computer
Thanks!
I want to send sensor data from MyRIO to XBee3 Mesh. I have been looking at the XBee's documentation to check where the UART port is, but I have not found this simple information, instead, I found DIOs and PWM pins.
We tried to send data using the USB port and we were unable to do so.
Can anybody help us out with it? Any help, even just a direction would be greatly appreciated!
Thank you,
AIMS
Page 11 of the Digi XBee 3 RF Module documentation shows the following pins for the TTL-level UART:
UART pins XBee 3 Device pin number
micro-mount surface-mount through-hole
DOUT/DIO13 3 3 2
DIN/CONFIG/DIO14 4 4 3
CTS/DIO7 24 25 12
RTS/DIO6 27 29 16
I am bit stuck, how can I make my arduino record into .wav files?
The arduino is connected with a microphone, and am using the Arduino ADC.
Any ideas? Will I be able to play them back using my pc?
many question cross my head
1- Is this possible using an arduino Uno
2- Is this possile using just a microphone connected to the Arduino ADC
3- if yes how can i get the wav format.
The idea gonna be like this
Ardiuno microphone-->Uno ADC -->arduino (library making wav sound)--> Storing data to a an SD card connected via SPI or maybe (connecting a Raspberry as a storage device)
also another question:
4- Do I need an amplifier due to the act that analog output from the microphone is very weak so the ADC couldn't detect the variation
In another log i had seen that i should connect the microphone to a level shifter.And that cause of the analog output is AC so i have to make the negative wave as 0 (for 10 it ADC)
the zero point as 512 and the positive as 1024 (10 bit ADC).(really i'm not sure about this part)
doing some research i got this library "https://github.com/TMRh20/TMRpcm/wiki/Advanced-Features#recording-audio" which is supposed to do the job, I mean making some wav file from the analog input.
So any help would be appreciated
Thx in advance,
Salah Laaroussi
Yes, although a bit complex it is very possible to do this via an uno.
The biggest hurdles to overcome is the limited amount of RAM and the clock speed. You will have to setup twin buffers to handle writing to the SD card. Make sure the card has a high enough write speed or the entire program will come to a screeching halt as you will run out of memory.
apc mag has a great article detailing out the circuit and code.
http://apcmag.com/arduino-projects-digital-audio-recorder.htm/
There are many things you haven't prepared yet:
output of microphone (assuming you know about electronics: still requires a biasing circuit e.g. a resistor + capacitor).
the output of the microphone is still very weak (in the magnitude of mV), which Arduino is incapable of capturing so you need a pre-amplifier
the design of the pre-amplifier will also include DC offset which makes the output of the microphone all above 0VDC which is in the range of the Arduino ADC otherwise the arduino will capture only those above 0VDC.
I'm new to USB development, and i'm quite confused about what data rates are realistic.
I'm trying to develop an external sound card connected on an AVR32 processor, which supports USB Full Speed(12 Mb/s). I'll use USB audio class 1 to send the audio data to a PC. I need to send 24 bit, 48kHz, 2 channels as INput to the computer, but also 24 bit, 48kHz, 1 channel OUTput from the computer. Streaming both ways.
That gives me a data rate of: 24 bit * 48kHz * 3 channels = 3,5 Mb/s, which should be possible by using USB Full Speed?
I understand that the Audio Class sends data via an Isochronous transfer, but i'm confused about how many transactions ( e.g. IN = 256 bytes ) it is possible to make in one frame? according to the USB specification (http://www.usb.org/developers/docs/usb20_docs/#usb20spec - > table 5-4) it seems to be possible to send more than one transaction per frame?
Is it possible to send both IN and OUT packets within one frame?
Thanks in advance!