====== txt2snd ======

''txt2snd'' is a small tool that allows to convert [[sf>ngspice]] (wikipedia: [[wp>SPICE]]) output into audio files - it's yet rather simple but has a built-in help. it's the predecessor and branch of the code now included in [[start|spicesound]]. As an external tool it's more flexible but much slower.

get the source: {{txt2snd-0.1.1.tar.gz}}

''txt2snd'' reads 4 tabulator separated values per line in the format:
  <idx/int> <time|ms/float> <ignored/float> <value/float>
example:
  11      8.916652e-05    1.846313e-02    -7.477363e-01

this format can easily be generated by SPICE. in the following example 20 seconds of ''net 5'' are printed at 48kSPS:
  .print tran  v(4) v(5)
  .tran 2.08333e-05 20.0 0 2.08333e-05
  .op

Note: Rounding (spice-milliseconds to audio-sample) is buggy and txt2snd includes an //only sometimes working// workaround (use ''--verbose'' to investigate skipped/missing frames).

the following script might come in handy..
  #!/bin/sh
  INFILE=example.netlist
  OUTFILE=/tmp/spice.txt
  WAVFILE=/tmp/spice.wav
  echo "# writing data to $OUTFILE"
  ngspice -b $INFILE | awk 'BEGIN{go=0;} /^-------------------------------------/{go=1;} /^[0-9]/{if (go==1) print $0;}' > $OUTFILE
  echo "# txt to snd"
  cat $OUTFILE | txt2snd $WAVFILE
  echo "# done."