[paul]

Thanks for the fast reply. Right now I am only interested in localization. I believe that even before you use the MultiFFT node in a standard localization network there has to be some sort of low-pass filtering. Otherwise the real-time spectrum coming out of the MultiFFT node is corrupted by aliasing.

Paul

EDIT: I just realized my mistake. Of course the relatively small sampling frequency of 16 kHz will always introduce a small amount of aliasing into the signal. It makes absolutely no sense asking for a filter AFTER the audio has been recorded.

• This reply was modified 5 years, 2 months ago by paul.

[paul]

Thank you, I successfully created a TF with wios.

Paul

[paul]

Im glad I could help. However I experienced a new problem with the debug version when using synchronous mode and an external recorder (plughw:1,0):

wios -s -x 0 -z plughw:1,0 -i input.wav -o output.wav (=>Fail)

If I enter the command above it only shows me the wios help page. As if I typed “wios -h”. It feels like it doesnt even know the option “-z”. Synchronous mode only works when leaving out “-z plughw:1,0” and therefore using the default setting. Although if I explicitly type in “-z plughw:0,0” it again shows me the help page ¯\_(ツ)_/¯

“plughw:1,0” works fine in recording mode:
wios -r -x 0 -t 4 -o output.wav -a plughw:1,0 -c 8 (=>Success)

• This reply was modified 5 years, 6 months ago by paul.

[paul]

@Masayuki Takigahira: I understood the wios_check_results and already tried -c 2 and -f 48000 together. What I did not think of was making the tsp a 48kHz stereo sound before playback with wios. Sadly, the results are the same (see attachment).

Attachments:

1. 

   Screenshot-from-2019-06-14-09-16-21.png
   

[paul]

@Masayuki Takigahira: Thank you. The script compiled successfully. Unfortunately, it did not give me any new information on how to overcome my problem with wios (see results of my wios_check in attachments). I hope I can do without wios.

Paul

Attachments:

1. wios_check_result.txt

[paul]

@Masayuki Takigahira: Thank you for your detailed reply and writing an extra tool. I would love to try out the tool because arecord and aplay work just fine and I still dont understand why wios is not working. I dont see any attachments to your post though 🙁

@Rohan: I wrote a very simple bash-script which records an plays almost simultaneously using arecord and aplay (see end of post). Maybe measure the unavoidable latency between both arecord and aplay commands in a practical experiment were you put speaker and microphone right next to each other. With that information you can maybe later edit the tsp responces accordingly. I will put it to a test soon if I cant get wios working.

!/bin/sh
echo “Starting…” 1>&2
arecord -d 2 -D plughw:1,0 -f S32_LE -r 48000 roomname_distance_d$1.wav &
aplay tsp.wav

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