RT60 vs PocketRTA Ultra

Now you can have an RT60 measurement tool for the iPhone. Another in the series of acoustic analysis and test applications from Studio Six Digital, RT60 measures reverb decay time for each octave band, 63Hz - 4kHz, by pulsing pink noise on and off, filtering the incoming signal by octave band, and measuring the timing of the decay of each octave band. RT60 conforms to international acoustics standard ISO 3382 for measuring room decay time (RT) using either the T20 or T30 method. RT60 will measure down to 50ms, and up to 4 seconds. Results are displayed for each band above the band, and the overall RT60 is calculated and displayed on the top of the screen. RT60 requires at least 25dB of headroom between the noise floor of the environment, and the level of the pink noise for T20 analysis. Turn up the amplifier to get more headroom. To use RT60, connect the iPhone output to the input of an amp and speaker, and carefully turn up the level after you tap the Generator icon. RT60 smoothes the results of several readings to get a more stable result. *** Screen Graphics The red bars are the current SPL level for each octave band. The thin black bars show the most recently measured maximum and minimum dB levels for the octave band that the RT60 calculation is using. The vertical yellow bars show the decay range that is available. Note that in some situations, you may not be able to overcome the ambient noise level in the room to get a good reading in every band. *** Calculations If a valid RT60 time can be computed, it is shown above the yellow bar. If it cannot be computed, no bar or value is shown. When your analysis is complete, you can save the graph image to your photo roll to include in a report. *** Calibration & Microphone Like all of the Studio Six Digital apps, RT60 can be calibrated. We set this field to the typical iPhone value, but if you have access to a calibrated SPL meter you can adjust this number as needed. There is a field to select Internal or External microphone. When Internal is selected, a compensation network is used to compensate for the response of the built-in or headset mic. When External is selected, no compensation is done. See our web site for more detailed information. Also, check out our other great audio and acoustics apps: AudioTools, SPL, SPL Graph, for recording SPL over time, RTA, ETC, FFT, Generator, and Speaker Pop. And, if you are looking for a great range of high-quality, professional, audio test equipment, check out iTestMic, iPrecisionMic, or liAudioInterface2.

Pocket RTA Ultra is a highly portable award winning real-time spectrum analyser for the iPhone. Pocket RTA Ultra has many advanced features which are normally only found in much more expensive sound analysis software, providing fast and accurate spectrum analysis suitable for both amateur hi-fi enthusiasts and professional A/V engineers. Uses include system calibration, monitoring of noise levels and testing of audio equipment. PocketRTA samples sounds using either internal or external microphones and then applies a Fourier Transform to the samples to obtain a frequency spectrum. The result is an accurate representation of the sampled sound broken down into its frequency components. Various display modes include, linear narrow band, logarithmic narrow band, Octave, 1/3 Octave, 1/6 Octave, RT60, SPL and Spectrogram displays with ANSI A and C weighting curves. Use the iPhone's multi-touch interface to perform real-time magnification of displays. The touch screen allows selection of the nearest FFT point giving a display of it's frequency and decibel level. Up to 32 times oversampling allow more stable readings for fluctuating or unstable input signals whilst our unique noise cancellation system allows you to remove unwanted background noise. PocketRTA features the ability to calibrate the display using a 1/3 Octave display in order to compensate for imperfections in frequency response of both internal and external microphones. The program automatically detects and switches between both sets of calibration data. Pocket RTA has the ability to capture up to 3 input signals and overlay them as a reference over live input. All display modes allow exporting of graphed data to the camera roll in JPEG format. These images can then by synced, transferred via FTP or emailed to your desktop PC for better analysis. -Variable Sample Rate from 8K to 48K. -Definable FFT frame sizes up to 8K (16K on 4s). -Standard ANSI/IEC A and C weighting curves. -32bit floating point sampling. -Up to 32x oversampling. -Smoothing (alternative to averaging). -Automatic noise cancellation. -Automatic peak note / frequency and octave display. -Narrow band Linear and Logarithmic scalable displays. -Spectrogram display with Log and Linear Modes. -1:1, 1:3 and 1:6 octave displays. -SPL (Sound Pressure Level) display. -RT60 Calculations on Impulse Recordings. -Mixer Mode. -LEQ Mode (Equivalent Continuous Sound Level). -10x zoom for accurate analysis of narrow band data. -Variable definable decibel scales. -EPPO Mode (Equal Points Per Octave). -Signal Generator (log/linear sweep tones, sine, pink, white, saw, square and impulse). -Touch screen display of nearest point with frequency and decibel readout. -Independent gain controls for both internal and external microphones. -Pause facility freezes the live trace to aid analysis of data. -Independent 1/3 Octave Calibration of internal and external microphones. -Capture Buffers allow an additional 3 reference traces to be displayed. -Camera Roll capture facility. -Save & Load Profiles (for multiple calibration and graph settings). -Export and Email CSV data. -FTP server to backup configuration files and exported data. -Peak trace facility for better reading of fluctuating frequencies. -Capture peaks over time facility. -Full Screen Mode (removes toolbars etc.). -Fast display update even with large FFT sizes. Whats New In Pocket RTA Ultra ============================= -Variable Sample Rate from 8K to 48K. -Added 8K 16K FFT Sizes for more accurate measurement. -Improved 32bit floating point sampling. -Smoothing (alternative to averaging). -Improved SPL (Sound Pressure Level) display with LEQ mode. -RT60 Calculations on Impulse Recordings. -Variable definable decibel scales. -Improved Signal Generator with log & linear sweep tones. -Save & Load Profiles (for multiple calibration and graph settings).