Analysing human singing and speech voice strength - forms relation of preset formant level and total voice sound level in real time

摘要

Voice signals from the microphone (1) are amplified by a preamplifier (2) with the same transfer characteristics as the human ear and passed to a dynamic compressor (3) which compresses the dynamic range of the voice signal from 80 to 40 dB. The compressed signal is then rectified by a precision rectifier (4) and passed to an A=D converter (5) with a sample and hold facility. The resultant sampled digital signal is then passed to a single chip computer (6) that calculates the RMS sound pressure and inertia valves for both the entire voice signal and the Formant (2-4kHz) range voice signal. These two valves are then digitally expanded and their relative sound energies displayed as a percentage value on either a LED (7) or LCD display (8). USE/ADVANTAGE - For voice training, rehabilitation etc., with detecting and display of voice parameters.