SpecStream Audio Spectrum Plot

HARDCODED JOY S.R.L.

In-app purchases

About this app

App gets audio data from microphone and plots the real time spectrum in the form of a scrolling image.

App settings:
• Sample Rate = the sample rate (in Hz) at which the microphone will be read. Most devices support up to 48 kHz. High-end devices support up to 192 kHz.
• FFT Buffer Size = the size (in samples) of the audio buffer used to compute the FFT. Must be a power of 2, min = 128, max = 16384. Bigger value gives better frequency resolution. Smaller value gives better time resolution.
• Min. Dispalyed Frequency
• Max. Displayed Frequency
• Gain (dB)
• Displayed Time Window (in milliseconds)
• Frequency Grid Step (in Hz) = will draw horizontal division lines
• Time Grid Step (in milliseconds) = will draw vertical division lines moving together with the plot.

Free version limitations:
• sample rate = 8000 Hz (fixed)
• FFT buffer size = 512 (fixed)

Users can upgrade to Premium Version via in-app purchase (one time payment).

Premium version advantages:
• configurable sample rate.
• configurable FFT buffer size: 128, 256, 512, 1024, 2048, 4096, 8192, 16384.

Planned features for future app updates:
• show spectrum of audio file
• export spectrum to file

Ratings and reviews

When they say it's under development they really mean it. I'm not sure what purpose this serves, as it is now it makes no sense, display is tiny and even if it was larger it wouldn't be of any use. 1 touch stops the scrolling but that's it. Results are meaningless tiny peaks without reference. No way to enlarge. Limited to 2kHz on top of it all, makes it kind of useless for any Audio testing. Not sure who the target user is for this?

I'll give four stars for the effort, but would be great if there's a way to interact with it other than just pause the graph. Loading a file instead of real time would be a killer feature for me.

It needs more..............more!!!!! No way to enlarge, change colors, or set the frequency axes on this app. Just scans whatever it's listening to with no grid or graph 📉 behind it. (Wrong answer buzzer) Ehhhhhhh, no good.......

What’s new

- targetSdkVersion 34
- improved performance
- option to upgrade to premium