SignalScope for iPhone OS devices is a real-time analysis toolset, suitable for use in areas such as acoustics, audio, electronics, and vibration. Out of the box, SignalScope includes an FFT-based spectrum analyzer and an oscilloscope. Additional tools, including a level meter, octave and 1/3-octave spectrum analyzer (RTA), and a signal generator are available via in-app purchase. Alternatively, it is possible to upgrade SignalScope to the full functionality of SignalScope Pro via in-app purchase.

Another upgrade via in-app purchase enables SignalScope to turn your iPhone or iPod touch into a platform for data acquisition, storing acquired data in tab-delimited text files or MAT-files for later retrieval from your device. Capturing plots as images to your photo library is included out of the box.

Input signals can be acquired from the built-in accelerometer, or from the current audio input path (the iPhone OS automatically selects the audio input path according to which external audio devices, if any, are connected to your device). Units, including Pa (pascals) and FS can be assigned to input channels of the dock connector audio input or the headset input (not available on 1st generation iPod touch devices). Sensitivity calibration can also be performed for any audio input device or input channel.

The data acquisition upgrade enables additional signal units, including Volts, Amps, g's, and ips (inches per second). (g's are always enabled for the built-in accelerometer.)

“Touch” your data with highly interactive, multi-touch enabled analyzer displays.

NOTE: The frequency response of the iPhone's built-in and headset microphones is quite flat. However, the built-in microphone of the original iPhone seems to be routed through a codec, which limits the sample rate to 8 kHz and significantly affects the frequency response. The iPhone 3G rolls off the built-in and headset mic signals below 100 Hz. Those interested in further discussion regarding iPhone microphones are invited to visit the forums.

NOTE: 3rd generation, or older, iPod touch devices require additional external hardware to get audio signals into SignalScope, due to the lack of a built-in microphone.

OpenGL Logo
RTA
Audio Units Logo
FFT Analyzer
Spectrogram
Oscilloscope
FEATURES
  • Analyze signals coming from the iPhone OS device’s current audio input device or from the built-in accelerometer.
  • Audio input is sampled at 48 kHz, built-in accelerometer data is sampled at 100 Hz.
  • Assign engineering units to your input signals and calibrate external transducers for accurate measurements. *
  • Save acquired time or frequency data to tab-delimited text files or MAT-files. *
  • Retrieve your data files from your device through a web browser on your Mac or PC. *
  • Save high-resolution analyzer display images to the iPhone OS device's built-in photo album.
  • Pinpoint individual sample values or frequencies with a cursor.
  • Zoom in or out on spectrum and waveform displays with two-finger expand/pinch gestures, even while the analyzer is running (FFT analyzer and oscilloscope).
  • Pan vertically or horizontally in zoomed displays with two-finger scrolling (FFT analyzer and oscilloscope).
Tools
  • FFT Analyzer
    • FFT lengths range from 100 to 9600 lines (50 to 4800 visible spectral lines)
    • Input data can be windowed with one of 7 different data window types
    • Lin, log, and dB magnitude scales
    • Lin and log frequency scales
  • Octave-band Analyzer (Available via in-app purchase)
    • Whole and 1/3-octave RTA (based on digital Butterworth bandpass filters)
    • Fast, Slow, and Impulse response times
    • Flat, A, and C frequency weighting
    • Equivalent and time-weighted exponential average levels
    • Max, peak, and elapsed time also captured
  • Level Meter (Available only via in-app purchase)
    • Measure time-weighted and equivalent rms signal levels (including Lp and Leq sound levels).
    • Employ Flat, A, or C frequency weighting.
    • Time-weighted measurement options include Fast, Slow, and Impulse weightings.
    • Keep track of peak and maximum sound levels.
    • Send sound level data in an email, or post it to your Twitter account.
    • Take a photo with your iPhone and overlay sound level information on top of it. The photo can then be saved to your device's photo library.
    • Save high-resolution sound level display images to the iPhone's Camera Roll photo album. Descriptive text may be added to the image before it is saved.
    • With the iPhone’s built-in microphone, the Level Meter can measure peak sound levels of up to approximately 105 dB. With the iPhone’s included headset microphone, the Level Meter can measure peak sound levels of up to approximately 100 dB.
  • Oscilloscope
    • Time scales from 0.1 to 500 ms per division
    • Auto, normal, and single-shot triggering
    • Trigger slope and threshold options
  • Stereo Signal Generator (Available via in-app purchase)
    • Random and periodic pseudorandom noise (period defined by FFT length)
    • White and pink noise weighting
    • Lin and log frequency sweeps
    • Tone generator


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