Manipulation of playback device response using an acoustic filter
First Claim
1. An acoustic filter comprising:
- a surface configured to be at least partially axially aligned with a transducer of a playback device; and
an array of apertures in the surface, wherein the array of apertures is configured to;
receive (i) first sound waves of a first range of frequencies that radiate according to a first radiation pattern having a first shape, and (ii) second sound waves of a second range of frequencies that radiate according to a second radiation pattern, wherein at least a portion of the second range of frequencies is different than the first range of frequencies;
attenuate the first sound waves such that the attenuated first sound waves radiate according to a third radiation pattern having a shape different than the first shape; and
pass the second sound waves in substantial accordance with the second radiation pattern.
4 Assignments
0 Petitions
Accused Products
Abstract
An acoustic filter includes holes and is configured to receive sound waves generated by an audio driver of a playback device. The sound waves comprise sound waves of a first frequency that radiate according to a first radiation pattern and sound waves of a second frequency that radiate according to a second radiation pattern that is less directed along an axis of the audio driver than the first radiation pattern. The second frequency is lower than the first frequency. The acoustic filter is configured to attenuate the sound waves of the first frequency so that the attenuated sound waves of the first frequency are emitted from the acoustic filter according to an effective radiation pattern that is less directed along the axis of the audio driver than the first radiation pattern and pass the sound waves of the second frequency in substantial accordance with the second radiation pattern.
99 Citations
20 Claims
-
1. An acoustic filter comprising:
-
a surface configured to be at least partially axially aligned with a transducer of a playback device; and an array of apertures in the surface, wherein the array of apertures is configured to; receive (i) first sound waves of a first range of frequencies that radiate according to a first radiation pattern having a first shape, and (ii) second sound waves of a second range of frequencies that radiate according to a second radiation pattern, wherein at least a portion of the second range of frequencies is different than the first range of frequencies; attenuate the first sound waves such that the attenuated first sound waves radiate according to a third radiation pattern having a shape different than the first shape; and pass the second sound waves in substantial accordance with the second radiation pattern. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A playback device comprising:
-
a transducer configured to generate (i) first sound waves comprising a first range of frequencies that radiate according to a first radiation pattern having a first shape and (ii) second sound waves comprising a second range of frequencies that radiate according to a second radiation pattern; and an acoustic filter axially aligned with at least a portion of the transducer, wherein the acoustic filter comprises an array of apertures, and wherein the acoustic filter is configured to; attenuate the first sound waves such that the attenuated first sound waves radiate according to a third radiation pattern having a shape different than the first shape; and pass the second sound waves in substantial accordance with the second radiation pattern. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
-
-
20. A playback device comprising:
-
a transducer configured to generate (i) first sound waves comprising a first range of frequencies that radiate according to a first radiation pattern having a first shape and (ii) second sound waves comprising a second range of frequencies that radiate according to a second radiation pattern; and an acoustic filter axially aligned with at least a portion of the transducer, wherein the acoustic filter comprises an array of apertures, and wherein the acoustic filter is configured to; reshape the first radiation pattern such that the first sound waves radiate according to a third radiation pattern having a shape different than the first shape; and pass the second sound waves in substantial accordance with the second radiation pattern.
-
Specification