|Current Version||Version: 1.0.1|
|Author||Faber Acoustical Services and Technolog|
|Description||Finally, two-channel transfer function and impulse response analysis comes to the iPhone! See http://youtube.com/faberast for video demos.
With IOScope, measure loudspeaker impedance, frequency response, and sensitivity. Measure a room impulse response. Tune a large sound reinforcement system, time-align a set of surround sound speakers, or optimize your home stereo. Determine the actual cutoff frequencies of your latest speaker crossover circuit, or teach your students the fundamentals of Fourier analysis of dynamic systems.
Measure frequency response magnitude and phase, coherence, and group delay. Time domain functions enable you to measure impulse response, ETC, and auto/cross-correlation. IOScope includes a built-in signal generator for producing suitable excitation signals to analyze your system or device under test (DUT). The reference signal can be taken from the internal signal generator or from an external source (when using an external reference, a stereo audio input device, connected to the dock connector, is required).
IOScope also turns your iPhone or iPod touch into a platform for data acquisition, storing acquired data in tab-delimited text files, MAT-files, or images for later retrieval from your device.
Different engineering units, including Volts, Amps, pascals, g's, and ips (inches per second) can be assigned to input channels of the dock connector audio input or the headset input (headset input not available on 1st generation iPod touch devices). Sensitivity calibration can also be performed for any audio input device or input channel.
“Touch” your data with interactive, multi-touch enabled analyzer displays.
IMPORTANT NOTE: iPod touch devices require additional external hardware to get audio signals into IOScope. The 1st gen iPod touch requires a dock connector input device (such as the Belkin TuneTalk Stereo or the MacAlly iVoice Pro) to be used with IOScope. All other devices can perform measurements with the headset connector, but using a stereo dock connector input device is recommended for the highest quality measurements. It is possible to use IOScope with an iPhone’s built-in microphone, but this is not generally recommended.
Visit http://blog.faberacoustical.com for important information about iPhone I/O.
- Analyze signals coming from the iPhone OS device’s current audio input device
- Measure device (DUT) characteristics by analyzing its input (X) and output (Y) signals
- Frequency response magnitude and phase, coherence, and group delay measurements
- Impulse response (IR), energy-time curve (ETC), and correlation measurements
- Frequency resolutions from 0.2 Hz to 10 Hz
- Measurement durations from 0.1 to 5 seconds
- Employ an external or internal reference (X) signal
- Reference (X) signals include: Internal Excitation Signal, Built-in Microphone, Headset Input, Ch1, Ch2, Ch2-Ch1 (depending on which audio input device is currently selected by the OS)
- Measurement (Y) signals include: Built-in Microphone, Headset Input, Ch1, Ch2 (depending on which audio input device is currently selected by the OS)
- Use cursor peak track to easily measure time delay
- Apply sample-accurate delay to the reference (X) signal for the highest quality measurements using an external reference (e.g. to compensate for acoustic delay in a sound reinforcement system).
- Audio input is sampled at 48 kHz (the 1st gen iPhone may limit sampling to 8 kHz, unless the dock input and headphone output are both used)
- Assign engineering units to your input signals and calibrate external transducers for accurate measurements (this allows IOScope to measure impedance in ohms, or device sensitivities such as SPL/V or V/Pa)
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