iPhone Quality Index



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Best on iPad.
A couple of good ears still required.

Equally great both for quick reference and for long - term live spectra display. Supports multiple FFT sizes, adjustable averaging time and bandwidth.

With Spectrum-Eye, You can:

- monitor sound quality on concerts,
- ring out feedback in stage monitors,
- find resonances in acoustic environments,
- evaluate spectral properties of audio material in studio,
- develop Your hearing skills (frequency - aware hearing practice),
- detect problematic frequencies in speech/music.

Supports external audio interfaces compatible with Your iPad or iPhone. Currently uses sum of input channels 1 & 2 to show the spectrum.

Allows selecting preferred iPad mic when no external audio interface is connected.

Uses iOS "Audio measurement mode" which bypasses built-in mic processing. This setting too can be switched on/off for comparison.

Spectrum bar plot has selectable bandwidth:

- 1 octave
- 1/3
- 1/6
- 1/12
- 1/24
- 1/48
- 1/96 (iPad only)

Bandwidth corresponds to actual resolution above certain frequency ("Interpolated below ...") which depends on current resolution and FFT size and can be found in settings below "FFT Size".

Resolution on frequencies lower than "Interpolated below" is lower than plot bandwidth and the plot is interpolated to get smooth results.

App also employs pink noise generator for cases where You will use it with external audio interfaces. You can use the app as a pink noice generator even when screen is off.

Re-position plot by sliding on scales (frequency scale for moving horizontally, dB scale for moving vertically). Scale the plot horizontally or vertically using two fingers.

The app is in active development and many new features are to be added soon. You are welcome for any suggestions and notes!
spectrum-eye screenshot #1
spectrum-eye screenshot #2
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spectrum-eye screenshot #4
Quality Index
2 reviews
Publisher: Naumenko Oleg
Formats(s): iPad2Wifi-iPad2Wifi, iPad23G-iPad23G, iPhone4S-iPhone4S, iPadThirdGen-iPadThirdGen, iPadThirdGen4G-iPadThirdGen4G, iPhone5-iPhone5, iPodTouchFifthGen-iPodTouchFifthGen, iPadFourthGen-iPadFourthGen, iPadFourthGen4G-iPadFourthGen4G, iPadMini-iPadMini, iPadMini4G
Genre(s): Music, Education
Filesize: 5MB
Age rating: 4+
App version: 1.2
spectrum-eye image #1
22 May 2018
Version: 1.2
21 May 2018
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