Spectrum Eye RTA2.1 - App Store

A Lifetime purchase. No Subscriptions.

Spectrum Eye shows the frequency content of what your mic or interface is hearing - smoothly, at high FFT sizes, without freezing the UI.

Version 2 is a full rebuild: Metal plot, bars / line / spectrogram, calibrated SPL, and mic correction on the live spectrum.

For music professionals, audio engineers, sound technicians, installers, car audio, and audio students. Equally at home as a quick check or a plot you leave running.

WHAT YOU CAN DO
. Monitor sound quality at concerts and rehearsals
. Ring out feedback in stage monitors
. Find resonances in rooms, boxes, instruments and cars
. Check spectral balance of playback in the studio
. Practice frequency-aware hearing
. Measure SPL with A / C / Z weighting and Fast / Slow / Leq

PLOT
. Bars, line, and spectrogram - the configuration button is in the top right corner
. Fractional-octave resolution from 1/1 through 1/96
. Line smoothing follows the same octave map
. Peak hold with a slow release, optional fill under the line
. Find Peak (FP) tracks the loudest band in the visible range
. Classic or Overlay layout treats plot area vs scales differently; Overlay is the default
. Pan, pinch-zoom, and a live cursor in Hz and dB
. Frequency visible range presets (Full 8 Hz-22 kHz, Audio, Lows, Mids, Highs)
. Magnitude-range presets
. Spectrogram duration, Jet / Viridis / Inferno / Grayscale color palette
. Light, Dark, or System appearance, plus a custom plot color
. Spectrum update rate: 60 fps Smooth, 30 fps Efficient, or Auto (drops under heat or Low Power Mode)

SPL
. IEC-style meter: Fast, Slow, and Leq
. A, C, and Z (flat) frequency weighting
. Per-route SPL offset so you can calibrate against a reference
. Yellow / red SPL alarm thresholds per weighting, with UI tinting
. Clip indicator and a 30-140 dB level meter bar
. iPhone: Large panel in portrait device orientation; in landscape orientation, compact readout in the top bar
. iPad: switchable large and compact SPL mode
INPUT AND CALIBRATION
. Built-in mics (including iPad position / directivity where the device offers them)
. External microphones and class-compliant audio interfaces
. iOS measurement mode to bypass built-in HPF, EQ, and AGC (recommended)
. Import mic calibration files (.cal, .txt, .csv); optional phase column is ignored
. Per-route calibration curve and IEC weighting on the live spectrum
. Pink noise generator, including with the screen off (Lock Screen / Now Playing)

ANALYSIS
. FFT sizes 4K / 8K / 16K / 32K (default 16K)
. Fall-rate presets: 50 ms, 100 ms, 250 ms, 500 ms, 1 s, 5 s per 6 dB
. Nominal capture sample rate - 48 kHz, display ranges from 8 Hz to 22 kHz

Audio is processed on the device. Spectrum Eye does not record, store, or upload your audio.

Suggestions welcome - the app is in active development.

Includes In - app purchases: tips to the developer only. All the functionality is available once you download the app.

Version History * 2 - plot layout on iPad, displays spectrum and spectrogram at the same time.
* Replaced the audio engine with a newer, faster one
* Fixed spectrogram stuttering when opening the app
* Improved UI layout, readability and clarity.
* Implemented steps nessesary for iPhone Duo support 2.1 1d ago Spectrum Eye 2.0 is a completely new live RTA release.

• Redesigned user interface
• Fast Metal plot with bars, line, and spectrogram display types
• Overlay and Classic layouts dictate how graph and scales share space; Overlay is the default - looks just like before
• IEC-style SPL meter: Fast / Slow / Leq and A / C / Z, compact or large view
• Import mic calibration (.cal, .txt, .csv) and apply it to the live spectrum and SPL
• Find Peak tracks the loudest band, making ringing out resonances easier
• Peak hold with a slow release; optional fill under the line
• Fractional-octave resolution through 1/96
• Time averaging is now "Fall rate" - clearly labeled in seconds.
• Per-weighting yellow / red SPL alarms with adjustable thresholds
• Light, Dark, and System appearance 2.0 Sep 18 - frequency range popup has all frequency labels
- better display of parameters in Settings -> Input source
- sample rate checks for more stable operation
- ready for new 11" & 12.9" iPads!
- more distinct scale labels 1.3.3 11/08/2018 - maintenance app update, bug fixing & battery usage optimization 1.3.2 10/25/2018 Fixed localization and appearance issues. Better layout on iPad.
Ready for iPhone X, XS, XR, XS Max. 1.3.1 10/19/2018 About this small maintenance update:
- iOS 12 ready!
- As per Your suggestions, added plot color selection in settings.
- Parameter popups don't disappear immediately as You select a value. Tap as many times as You want.
- Fixed rare issues with animation freezing on iOS 11.4/12.0.
- Fixed a bug with sample rate mismatch after using other audio apps with low sample rate.
- Minor but notable CPU usage optimization due to better averaging algorithm.
- This is the last version supporting iOS 9.3. Next release will use iOS 10.0 as minimum.
- Enjoy! 1.3 09/05/2018 - fixed layout issue on iPhone in portrait orientation.
- minor user interface & performance improvements.
- addressed an issue when with open Settings app would continue recording even when not on screen
- fixed rare crash on older devices (iPhone 5) when app is not on screen 1.2 05/22/2018 1.1 05/14/2018