How does audio THD and S/N ratio compare to other devices?
Recording with the internal mic and listening by ear, I don’t notice any problems; but if you like numbers you won’t like these. First the background: I used a Turtle Beach Fiji soundcard and SpectraLAB software to generate a 1 kHz sinewave for recording, and then analyse the playback using a fourier transform. The test setup itself has stereo 16 bit D/A and 20 bit A/D, and has 0.008% THD+N and 82.3 dB SNR in analog loopback mode. In the table below I show what I measured for all the audio recording devices I had handy today. Note that what I am calling SNR is actually the signal to (broadband noise+60 Hz pickup+distortion) ratio, and it is a more stringent test of an audio system than a simple dynamic range measurement. With 16 bit sampling at 48 kHz, the MiniDV format should be capable of reproducing CD or DAT quality sound. I tried two different signal generators, with and without attenuation right at the mic input. The TRV900 consistently comes in at 0.8% THD+N and 42 dB SNR, which
