초록

A sound masking system for generating background sound. The background sound is automatically adjusted to ambient noise levels by adjusting the amplitude of the frequency levels detected.

대표청구항 ▼

A sound masking system comprising means for generating a random noise spectrum; a plurality of primary filters for separating the random noise spectrum into signal components of predetermined frequencies; a plurality of divide circuits, each said divide circuit being operative for receiving an assoc

A sound masking system comprising means for generating a random noise spectrum; a plurality of primary filters for separating the random noise spectrum into signal components of predetermined frequencies; a plurality of divide circuits, each said divide circuit being operative for receiving an associated signal component from among said signal components at a divide input port thereof; amplification means, said amplification means receiving an output from said divide circuits for driving a sound generating means in correspondence with said output; at least one microphone for sensing sounds in the ambient sound environment and providing an electronic signal in correspondence therewith; an input amplifier for amplifying said electronic signal; a plurality of secondary filters for receiving the amplified electronic signal and separating said electronic signal into predetermined frequency components thereof; said secondary filter providing input signals to a plurality of electronic detector circuits; said plurality of error-detecting circuits operative for receiving signals from said electronic detector circuits and feeding an error signal in correspondence with the output of said detector circuits to the denominator input ports of said plurality of divide circuits, whereby said divide circuits vary the output amplitude of said signal components to said amplification means for automatically adjusting the volume of the sound masking system throughout the frequency spectrum thereof.