Volume and tone control in direct digital speakers

A 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 includes a 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.

A method for controlling volume of an input signal configured to be fed 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 method comprising:
• a. 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. 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.

A computer program product, comprising a computer usable medium having a computer readable program code embodied therein, said computer readable program code adapted to be executed to implement a method for controlling volume of an input signal configured to be fed 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 method comprising:
• a. 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. 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.