If you need very high resolution in the lowest octaves you may want to set the sampling frequency lower in order to increase resolution in the very low frequency range. TrueRTA will remember your sampling frequency settings from session to session. So the best overall tradeoff for many audio measurements will be the default 44.1 kHz. Increasing the sampling frequency to 48 kHz or 96 kHz will increase the high frequency measurement bandwidth but will also reduce the low frequency resolution. The default input sampling frequency for TrueRTA is 44.1 kHz, the CD sampling frequency. Note that in this measurement all harmonics of the test tone are more than 80 dB below the test signal (0 dBu). The figure below shows TrueRTA measuring the sine wave performance of the internal digital signal path of a PC. In combination with your PC, TrueRTA provides a powerful audio testing capability, normally seen only in better audio research and design laboratories. By creating these test instruments in software and employing the signal input and output capability of your PC's sound card, we are able to offer a level of performance that could only be achieved by many thousands of dollars worth of traditional test instruments. The instruments found in it include a low distortion signal generator, a digital level meter, a crest factor meter, a dual trace oscilloscope and a high-resolution real time analyzer. TrueRTA is a collection of real-time software-based instruments for testing and evaluating audio systems using a PC with basic sound input/output capability.
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