Spectrograms (as opposed to a real-time spectral slice)?

Frequency And Sulphur

Any chance that SignalScope for the iPhone will be getting a spectrogram display in addition to the FFT analyzer that seems to be on there?  Real-time would be nice, but more useful (to me) would be the ability to record a short segment and then draw a zoomable spectrogram?

This would be very useful for me, as it provides a somewhat more conventional way of looking at speech acoustics.

benfaber

Yes.  A real-time spectrogram is in the works.

Ben

overtones

Hi there, I also had the familiar problems downloading this app, but it updated itself onto my iPhone this evening, and it looks fantastic. A really great program!

My background is in music, so although I know a lot about frequencies and stuff I'm certainly not an expert on this type of program. Perhaps a lot of iPhone users will be like me. I'm not sure exactly what a spectogram is, but I suspect that is something I am looking for too. Just so you know what I would be trying to use your program for:

1. Illustrating vowel shapes to singers (shape of strength of overtones)

2. A visual way to encourage singers and instrumentalists to produce a stronger 'tone', by which we usually talk about producing stronger overtones (upper harmonics).

I've fiddled about with the settings, I wonder could you recommend any particular settings for the uses I mention there. For instance I think linear works better than log for the frequency side of things.

And once again thanks for a brilliant app!

benfaber

overtones,

It sounds like a spectrogram would be very valuable to you. You can take a look at our Mac software for sample spectrogram displays.

For now, with SignalScope on iPhone, your best bet may be to work with a linear frequency scale and a dB magnitude scale. Increasing the number of spectral lines will improve the frequency resolution, but it will slow down the responsiveness of the spectrum display. A little trial and error can help you find a setting that you like best.

The harmonic cursors may also be helpful.

Enjoy!

Ben

Frequency And Sulphur

Any updates on this?  I'm very eagerly anticipating a spectrogram option, even more if I could set the window length on the spectrogram (to reveal formants in speech, for instance).

benfaber

There's nothing to announce yet.

What range of window lengths would you be looking for?

Frequency And Sulphur

I'd like to be able to switch to a window length around 0.005 seconds to get a good broadband spectrogram :)