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  • DD4WH's Avatar
    Yesterday, 06:20 PM
    Yes, you said so. As far as I know, the proposed solution by Frank B also works without an audio shield (but I may be wrong): ...
    7 replies | 157 view(s)
  • DD4WH's Avatar
    Yesterday, 09:27 AM
    Hi Javier, congratulations! Maybe it is better to not use a modification of the original Audio lib files? (but depends on your goals) The thread I meant is this one and it describes a simple way of changing...
    7 replies | 157 view(s)
  • DD4WH's Avatar
    04-23-2018, 06:42 AM
    Hi, there are (at least) two possibilities: * use a lower sample rate --> search for Frank B "changing sample rate" thread for the code to change sample rates. However as far as I remember, lowest sample rate is...
    7 replies | 157 view(s)
  • DD4WH's Avatar
    03-06-2018, 05:24 PM
    Hi Gerry, most transceivers use the LMS algorithm in the time domain for noise reduction, which does a good job when your signal already has high SNR. If your signal has a low SNR and you would like to "pull it...
    26 replies | 9340 view(s)
  • DD4WH's Avatar
    03-06-2018, 09:47 AM
    Hi! looks like a great HAM RADIO project! @LU6PSG: you are talking about TRANSMIT, whereas this thread is about RECEIVE I do not think that RF clipping is the right way to achieve good TX SSB quality. Dave...
    26 replies | 9340 view(s)
  • DD4WH's Avatar
    03-01-2018, 02:31 PM
    Hi Bob, that really looks great and makes a very nice control box! Thanks also for the great documentation on your website! All the best and good progress with the migration of your DSP-10 ! Frank DD4WH
    1 replies | 199 view(s)
  • DD4WH's Avatar
    03-01-2018, 02:20 PM
    Walter, thank you! OK, I understand, the multiplexer remained active and sent audio data to the queue, so the sketch kept on writing to the SD card, even when the process1 refused to deliver more blocks and therefore...
    34 replies | 1660 view(s)
  • DD4WH's Avatar
    03-01-2018, 01:58 PM
    Walter, thank you! OK, I understand, the multiplexer remained active and sent audio data to the queue, so the sketch kept on writing to the SD card, even when the process1 refused to deliver more blocks and therefore...
    34 replies | 1660 view(s)
  • DD4WH's Avatar
    03-01-2018, 06:47 AM
    Yes, totally agreed, and I really acknowledge that you put this in the public domain so others can mess around with that! Thats very helpful! And I would really like to contribute to the code as soon as I get the grasp...
    34 replies | 1660 view(s)
  • DD4WH's Avatar
    03-01-2018, 06:40 AM
    let me try to summarize what I have understood how the threshold works: 1.) highpass filter the incoming audio block: aux(t) = (data(t) - data(t -1)) * (data(t) - data(t -1)) 2.) determine maximum value of all the...
    34 replies | 1660 view(s)
  • DD4WH's Avatar
    02-28-2018, 06:57 PM
    Hi Walter, thanks for the addition! Took me some two hours now trying to understand what the new addition to the sketch does exactly . . . Let me try to summarize how I understood it: - I2S 24bit data from...
    34 replies | 1660 view(s)
  • DD4WH's Avatar
    02-28-2018, 03:33 PM
    Hi Walter, thanks a lot for this update! I gave it a try and I was able to change gain by changing the I2S data bit shift in line 221 in myAPP.cpp For recording near field a 12 bit shift is good, using a shift...
    34 replies | 1660 view(s)
  • DD4WH's Avatar
    02-28-2018, 10:07 AM
    Hi Walter, I hope it is ok that I spam your thread with my observations ;-). If not, drop me note. Here is a comparison of recordings made with ONE mic and TWO mics (MONO / STEREO) I recorded 30 sec of music...
    34 replies | 1660 view(s)
  • DD4WH's Avatar
    02-27-2018, 10:09 PM
    also managed to connect two mics to record in Stereo ! // for ICS4343x microphones T3.6 Mic1 Mic2 GND GND GND 3.3V VCC VCC Pin9 CLK CLK ...
    34 replies | 1660 view(s)
  • DD4WH's Avatar
    02-27-2018, 07:43 PM
    Hi Walter, thanks a lot for your logger! Just tried the "BasicAudioLogger" and it seems to work quite well. Just some first observations from one and a half hour of experimenting: * I changed myAPP.cpp in...
    34 replies | 1660 view(s)
  • DD4WH's Avatar
    02-26-2018, 07:54 PM
    Hi Walter, thanks a lot, that looks excellent! Will try it in the next days! Yes, I am definitely interested in the new logging approach! During the last weeks, I realized that even with the audio library and the...
    34 replies | 1660 view(s)
  • DD4WH's Avatar
    02-26-2018, 10:39 AM
    Hi Walter, I have some problems getting started with your sketch: * I would like to use a ICS43434 breakout board (by onehorse from Tindie) with your logger sketch to record audio on an SD card with a Teensy 3.6....
    34 replies | 1660 view(s)
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About DD4WH

Basic Information

About DD4WH
Location:
Central Europe
Interests:
Software Defined Radio, Digital Signal Processing, Bat detection & bioacoustics

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FFT decreasing BW modifiying sampling frecuency? Yesterday 06:20 PM
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Yesterday 06:21 PM
Join Date
10-25-2015