System and method for digital signal processing
The present invention provides for methods and systems for digitally processing an audio signal to reproduce high quality sounds on various materials. In various embodiments, a method comprises filtering the signal with a low shelf filter and/or high shelf filter, passing the signal through a first compressor that, filtering the signal again with a low shelf filter and/or high shelf filter, processing the signal with a graphic equalizer based on a selected material profile, passing the signal through a second compressor, and outputting the signal to a transducer.
1. A method for processing a signal comprising:
filtering the signal with a first low shelf filter and a first high shelf filter, creating a filtered signal;
compressing the filtered signal a first time;
processing the filtered signal based at least on a material profile;
compressing the filtered signal a second time; and
transmitting an output signal to a transducer.
2. The method as recited in claim 1 wherein the transducer is not a loudspeaker.
3. The method as recited in claim 1 further comprising the step of selectively adjusting a gain of different frequencies of the filtered signal based on said material profile using an equalizer.
4. The method as recited in claim 3 wherein the material profile comprises material characteristics.
5. The method as recited in claim 4 wherein the material characteristics comprise surface area, size, shape, rigidity, density, or type of material.
6. The method as recited in claim 1 wherein the first low shelf filter and high shelf filter are configured to create an approximate 24 dB differential between high and low frequencies in the filtered signal.
7. The method as recited in claim 1 further comprising filtering the filtered signal with a second low shelf filter and filtering the signal received from the second low shelf filter with a second high shelf filter.
8. The method as recited in claim 7 wherein said second low and high shelf filters comprise gain values which are at least partially inverse relative to the gain values of the first low shelf and high shelf filter.
9. The method as recited in claim 7 wherein the second low shelf filter and high shelf filter comprise frequency values which are approximately equal to frequency values of the first low shelf filter and high shelf filter.
10. The method as recited in claim 1 further comprising the step of transmitting the filtered signal before it is processed at a post-transmission processing module.
11. An audio system comprising:
a first low shelf filter and a first high shelf filter configured to filter a signal and generate a filtered signal;
a first compressor configured to compress the filtered signal;
an equalizer configured to process the filtered signal, after having been compressed, based at least in part on a material profile, to generate a processed signal;
a second compressor configured to compress the processed signal; and
a transducer configured to output the processed signal after it has been compressed.
12. The audio system as recited in claim 11 further comprising a transmitter structured to transmit the filtered signal after it has been compressed by said first compressor.
13. The audio system as recited in claim 12 further comprising a receiver structured to receive the signal transmitted from said transmitter.
14. The audio system as recited in claim 11 wherein said transducer is structured to vibrate a material in order to reproduce sound, the material is not a diaphragm of a loudspeaker.
15. The audio system as recited in claim 11 wherein said equalizer is configured to selectively adjust the gain of different frequencies of the filtered signal based on said material profile.