Patent ID: 8126163
Filing Date: 2012-02-28
Classification: H04R

Abstract:
1. A system that includes a direct digital speaker volume control device configured to be coupled to a direct digital speaker; the direct digital speaker comprising a plurality of pressure producing elements being adapted to generate a sound at a sound pressure level (SPL) and at a given frequency in response to an input signal, without using digital to analog converter; the direct digital speaker inherently exhibiting a frequency response throughout its entire frequency range; the direct digital speaker volume control device comprising: a. a module for providing at least two filters each having a distinct cutoff frequency such that each filter exhibits substantially no attenuation below its cutoff frequency and an attenuation response above said filter's cutoff frequency; and b. a selector for selecting at least one of said filters according to a selection criterion that depends on at least a desired volume and frequency of generated sound, and applying said filter to said input signal for generating a filtered signal that is configured to be fed to said speaker.