I am new one, how to send the openbci data to speaker(audio card) by matlab software, I want to output the openbci crginal data by the audio card of the PC, then I will get the signal to my other set.
One avenue that has been pursued by some experimenters, is to use the ability of OpenBCI GUI, to output the data stream in the OSC (Open Sound Control) format. This can then be consumed by free apps such as PureData / PD. And Max. Both of these are sound synthesizer programs.
Yet another route is with the various VPL (Visual Programming Language) apps such as BioEra, BrainBay, LabView, etc. These all have MIDI or audio output capabilities as well as signal processing element blocks. PureData is also a VPL.
In fact, I don't want to hear the brain electrical audio signal, I want to make the collected OPENBCI sampled signal output to other signal amplification devices and the electrical signals will be the analog signal ,I want to do other research, such as make the electrical signal input body again, but to ensure that the output signal waveform, frequency should be consistent with the original signal, not distortion, I didn't know what kind of better way, so the thought of using sound card output, my question is, according to my purpose, do you have a better way to output signal? Thank you.
Sorry, I did not speak clear my mean, what I mean is to output the original EEG signal by computer to other device, no software, or may not be what amplification device, just want to output the original signal, with its original frequency waveform. I began to think of the sound card, but worry that convert software will lead to signal distortion, so I want to find a better way.
I need output the original signal to brain or body(EMG), I want to research the inverse problem, when I input the same signal to brain or muscle, what feeling will be felt?
You can write a conversion program, that turns the OpenBCI sample stream into a WAV format audio file. Then you can play that audio file. With the proper audio amplifier and voltage reducing resistor divider network, you can achieve any practical output voltage.
convertToWAV.pde, seems to have the most recent date. Is that the file you used?
You are just going to have to play around with this yourself. I have no experience running this app. You may need to get into the code and see how it works.
Also, I don't know for a fact that audio playback programs (that read WAV files), can playback one of the WAV files output by this conversion program. Because the sample rate is so low (250 hz), and audio playback is usually done at multi-kilohertz sample rates. But if the playback program is playing the samples at the rate recorded in the file, it should work. Some playback programs may balk or issue a warning with low rates like this. You'll just have to find one that works.
Good luck. I can't really answer any more questions on this.
I want to send the eeg_data to USB port, then connect the D/A converter and the signal-amplifier, the coil, then Reverse the input to electrical signal the brain, the problem is similar to TMS, but I don't know how to send the wave eeg date to USB. The MATLAB need National instruments data acquisition card, the cost is too high, can I have good solution to get my experiment design, I had tried to send the eeg date to sound card, then connect Audio amplifier and the coil, but the Audio amplifier can't response low 20HZ frequency , the eeg data will lost low frequency, I need the all original signal, so I want to send the eeg data to serial port (usb port). can you have the available solution? I ma new one, I need your help. Thank you!
But how to use the cyton dongle or Wifi to send signal, they are wireless signal, I want to get cable signal, or mybe bluetooth signal will be ok because I have several bluetooth module, the can receive audio signal from PC or other set, I don't know how it can get other wave signal?
You do not need to put the Cyton data stream on usb. Just receive the data as normal over the radio link and then send to your (modified) audio card. The hardware mod will enable the audio card to transmit down to .1 hz or even lower.
Without the hardware mod, all audio output cards have AC-coupling with a capacitor on each channel. This cuts off the low frequencies below 20 hz.
Comments
In fact, I
don't want to hear the brain electrical audio signal, I want to make the collected
OPENBCI sampled signal output to other signal amplification devices and the electrical signals will be the analog signal ,I
want to do other research, such as make
the electrical signal input body again, but to ensure that the output signal waveform,
frequency should be consistent with the original signal, not distortion, I
didn't know what kind of better way, so the thought of using sound card output,
my question is, according to my purpose, do you have a better way to output
signal? Thank you.
is to output the original EEG signal by computer to other device, no software,
or may not be what amplification device, just want to output the original
signal, with its original frequency waveform. I began to think of the sound
card, but worry that convert software will lead to signal distortion, so I want
to find a better way.