SPICE audio tools
This repository has two programs for importing wav file to SPICE and
exporting the output as a wav file.
1. wavtospice.py
- This tool converts a wav file with a list of values, which can be read
using ngspices file source. If wav file has multiple channels only the values
of the first channel are returned.
- Usage: python wavtospice.py <input file> <output file>
- Ngspice must have been compiled with xspice support. File source can be used
like follows:
a1 %v([in]) filesrc
.model filesrc filesource (file="values" amploffset=[0] amplscale=[1]
+ timeoffset=0 timescale=1
+ timerelative=false amplstep=false)
See ngspice manual for possible options.
2. spicetowav.py
- This tool converts ngspice output to wav file. Compatibility with other
simulators is untested.
- Use "wrdata" command in the spice netlist to save data to file.
Run the ngspice in batch mode using the command line flag -b.
- Usage: python spicetowav.py <SPICE output file> <Output wav> [clipping voltage].
Clipping voltage is optional and if it's unspecified wav is written
with maximum amplitude such that clipping doesn't occur.
# Example
Following commands can be used to get output from lowpass filter example file
when run on Linux:
$ ./wavtospice.py file.wav inputvalues
$ ngspice -b examples/lowpass.cir
$ ./spicetowav.py output.data output.wav