Switcher CAD III and wav

[Someone Electro]

I want to inport and export .wav files in switcher cad to simulate a audio filter.But i get some random skipes out of th wave,

How to make WAV files that SW CAD understands?

 

[Papabravo]

Ask the guys on the yahoo group

 

[Roff]

Did you read this section of the SwitcherCAD help file?

Syntax: Vxxx n+ n- wavefile=<filename> [chan=<nnn>]
*
This allows a .wav file to be used as an input to LTspice. <filename> is either a full, absolute path for the .wav file or a relative path computed from the directory containing the simulation schematic or netlist.* Double quotes may be used to specify a path containing spaces.* The .wav file may contain up to 65536 channels, numbered 0 to 65535.* Chan may be set to specify which channel is used.* By default, the first channel, number 0, is used.* The .wav file is interpreted as having a full scale range from -1V to 1V.

*
This source only has meaning in a .tran analysis.

 

[Papabravo]

Sorry Ron, I forgot that you frequent both groups. The OP should still go to the yahoo group to learn more.

 

[Roff]

Sorry Ron, I forgot that you frequent both groups. The OP should still go to the yahoo group to learn more.

Well, I've never tried a WAV file as a source. I just know that the help file is pretty extensive, and a lot of questions can be answered by reading it. The OP may have already done so. If that's the case, the Yahoo group is really good, as you pointed out.

 

[Someone Electro]

I tryed searching in the help for anywhing cotaning wav and dodnt get anything.This seciton that you postes describes the use of chanels.I always used a mono file as set chanel to 0.

 

[Roff]

I tryed searching in the help for anywhing cotaning wav and dodnt get anything.This seciton that you postes describes the use of chanels.I always used a mono file as set chanel to 0.

Can you post you WAV file, or a link to it?

 

[Someone Electro]

I was fooling whith the settings a bit and now it works.

Filter sounds good by the way hehe.

It takes a lot of procesing power my 3Ghz P4 could do at most 100ms in the sim in 1 second mostly got below 50ms per second.

 

[evandude]

Could you by any chance post your project files and the WAV you used? I am interested in playing with this, I didn't realize you could input a WAV file and filter it like that! very cool.

 

[Someone Electro]

I was desigening a active low pass filter.

I have a 20 second chop out of englands eurovision song.I can also post the save file and output if anyone wants.

I wish SW CAD III was more user frendly.

 

[evandude]

well, I mainly wanted to see your project files to see how to actually input, filter, and output a wav file with switchercad.

 

[Someone Electro]

Here they are! The audio input and output,also the save file

I can post it in the projects when its done if you guys are interested(We dont have much audio amps in the projects anyway)

EDIT: Note that thins is not a very good way of doing audio editing.I used it as filter design becuse it better than wathing a freqecy response curve.

 

[evandude]

Well it's useful to me because I have one project where I would like to try and remove background road noise from voice recorded by a microphone in a moving car, and since I don't know specifically what band of frequencies I need to reject in order to get the audio to be accepted by the speech recognition software, it would be nice to be able to do it all in a simulator so I don't have to spend hours swapping parts in and out of a breadboarded circuit... then when finished I can just put it all on a small PCB and be done with it.

 

[Dr.EM]

For doing what you want to do Evandude, you could try direct-x or vst processing. They usually need a host, but there are some standalone ones. Here is a demo of a parametric standalone EQ if you're interested:

**broken link removed**

 

[evandude]

nice, thanks! that should help me figure out what kind of frequency response I need to start with for a filter.