IT1258548B - Electronic device for autoregulation of the acoustic pressure of music, especially for ballrooms - Google Patents

Abstract

The device provides a microphone 1, which picks up the acoustic pressure, followed by an amplifier 2 and by program-controlled preselectable weighting filters 3. The signal picked up is then processed by a logarithmic amplifier to linearize the values in dB. The signal then goes to a converter 5 (RMS detector) and, having been transformed into a dc voltage proportional to the acoustic pressure, it arrives at an integration circuit 6 which averages out the measurement over time. Finally, the signal arrives at a microprocessor 7, programmable by keypad 8 and visualising on a display 9 the various functions, then intervening, based on a clock 10, to activate the digital outputs 11, the analog output 12, and the data on a printer 13. Said outputs in digital and analog mode can control the VCA which is amplified and controlled 14 to regulate the acoustic pressure in relation to the specified program. In order to program the device, using a keyboard 8 with key head, the program is activated and the sampling times are set: the waiting time before the intervention, the intervention time to reset the pressure, and the maximum allowable pressure is determined. One then programs the intervention time as a function of the time intervals and selects the weighting filter 3, the constant 6, the printer if any, and the clock 10. <IMAGE>