True Audio TrueRTA 3.5.1 - Real Time Spectrum Analyzer
TrueRTA™ is a software based audio analyzer for testing and evaluating audio systems using just a PC with basic sound capability. The instruments found in TrueRTA include:
• Low distortion signal generator
• Digital level meter
• Crest factor meter
• Dual trace oscilloscope
• High-resolution real time audio spectrum analyzer
TrueRTA’s audio spectrum analyzer software shows you a detailed picture of what you’re hearing in real-time, that is, as it happens. The audio spectrum analyzer shows the changing spectrum of live input signals up to 48kHz (half the maximum sampling frequency). The size of the waveform sample is variable so that shorter samples can be used where a high frame rate is required, as in sampling live music. Longer samples provide increased low frequency resolution with the tradeoff of slower updates. The latter settings are appropriate for highly accurate frequency response measurements.
The screen shot below shows TrueRTA evaluating the performance of the E-MU 0404 USB sound system with a 1kHz sine wave where the 1 kHz distortion components are seen to be below -100 dB (i.e., less than 0.001%).
TrueRTA Self Test of an E-MU 0404 USB sound system, shown in Bar Mode (black background)
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