![]() ![]() * - Act as multiple DSP filters based on hi pass, lo pass, band pass or band stop (filter points can be defined in Hz within the code) * This project is for installing into a Yaesu FT-817 but easily be adapted * Visit for information on how to use this code. ![]() Hello i have a brand new teensy 3.2 and i tried to compile this lines ![]() Hope these notes help you, Gareth 73 and thanks. Years after, I asked to F6CTE to include something like this in his freeware MultiPSK and he implemented a good pseudo-binaural solution in it you may hear it there as a test, it maybe interesting for you. These times ( 1970 or so) it was done by hardware of course. It may be understand as a stereo hearing, but it is not properly a stereo signal, so to say. The result is that the audio frequencies are "seen" by our brain as were coming from different points of the surrounding space, thus bettering the discrimination among them.įor example, you "feel" or "see" the audio "spreaded" high to low tones in front of you. On detected audio for pseudo, you get the audio and process it the same way, one left up-down, one right down-up on phase/frequency. If done to the IF you then detect the signals, one for left channel, one for right channel, and then amplify it for headphones (better than speakers). You take the signal (before detection for pure binaural, after for pseudo-binaural) and introduce a relative phase/frequency shift : one channel from high to low freq, and the other reverse, low to high. I try to explain binaural as a sort of space-diversity by ears, hi. Hi Gareth, no, binaural CW reception is not a stereo reception, but yes, it requires two audio output channels. I suspect using time delays introduced at various frequencies to create a second pseudo channel but it is not something I have ever considered. Note: Comments within the code frequently provide more detail than my write-ups.Ī video of the prototype is available via Īs for pseudo-binaural I am not sure how it is typical accomplished. If you have questions or want to help, contact me here but be aware my DSP knowledge is limited to what I have read in the past couple of weeks! With luck, a few more features will be added shortly. Upped the baud rate to 115200 from 9600įull details and source code are available from Its not much use yet since the setting is not saved between power cycles but I will add that in due course.ħ. To use it comment out "#define FT817" and uncomment "#define SPEAKER"Ħ.Ědded support for a rotary encoder to change the centre points of the filters. This makes it easy to use with external amplified speakers. Just make sure you don’t use these in CAT modeĥ.Ědded support for the Teensy audio board. To use this, make sure you select "Serial + Midi + Audio" for the "USB Type" on the Arduino Tools menu before compiling.ģ.Ědded USB to CAT support but have not had time to test it yet!Ĥ.Ědded options to enable different types of debugging support. There are examples of bandpass, bandstop, hipass and lowpass included in the "filterList" array.Ģ.Ğnabled emulation of a USB sound card allowing direct audio RX on a PC. Removes the need to use external tools to calculate the filters. This project would not have been possible without the great work of Paul Stoffregen and Bob Maling.ġ. That means the code and feature set is continually changing and is not what I would class as production quality. I only discovered the Teensy and its Audio library a few weeks ago so it is still very early days for me. My focus has been installing the Teensy into a portable Yaesu FT817 rig but the same principles can be applied to vendor’s equipment or with an external amplified speaker. into a single simple to install hardware/software package that can be easily updated. ![]() It also opens many possibilities for integrating non-DSP functions such as USB CAT control, audio interfacing, Morse decoding etc. The Teensy 3.2/3.5/3.6 are ideal add-ons for older Radio Amateur equipment which does not include built-in audio DSP functions. I have released an open source DSP audio processing project based on the Teensy audio library that targets Radio Amateur applications. ![]()
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