Receiver acoustic low pass filter

• US 9,571,921 B2
• Filed: 08/20/2012
• Issued: 02/14/2017
• Est. Priority Date: 08/22/2011
• Status: Active Grant

• Current Assignee: Knowles Electronics Llc (Knowles Corporation)
• Original Assignee: Knowles Electronics Llc (Knowles Corporation)
• Inventors: Miller, Thomas E.
• Primary Examiner(s): Chin, Vivian
• Assistant Examiner(s): Kurr, Jason R
• Application Number:
  US13/589,538
• Publication Number:
  US 20130051580A1
• Time in Patent Office: 1,639 Days
• Field of Search: 381/337, 381/338, 381/345, 381/350, 381/351, 381/352, 381/353, 381/182, 381/370, 381/372, 381/380, 381/382, 381/186, 181/144, 181/145, 181/146, 181/160, 181/182, 181/185, 181/196
• US Class Current: 1/1
• CPC Class Codes: H04R 1/1075 Mountings of transducers in earphones or headphones
• CPC Class Codes: H04R 1/24 Structural combinations of separate transducers or of two parts of the same transducer and responsive respectively to two or more frequency ranges
• CPC Class Codes: H04R 1/2857 for loudspeaker transducers

Abstract

A receiver apparatus includes a first receiver portion and an acoustic filter network. The first receiver portion has a housing and is configured to convert at least one electrical signal into first sound energy having a first frequency range. The acoustic filter network communicates with the first receiver portion and is configured to receive the first sound energy. The acoustic filter network includes at least one sound channel and at least one chamber that communicates with the at least one sound channel. The least one sound channel includes a main branch and a first side branch and the at least one chamber comprises a first chamber. The first side branch communicates with the main branch and the first chamber, and the main branch is configured to receive the first sound energy.

Claims

1. A receiver apparatus comprising:

a first receiver portion, the first receiver portion having a housing with a single sound outlet and configured to convert at least one electrical signal into first sound energy having a first frequency range;

a second receiver portion, the second receiver portion configured to convert the at least one electrical signal into second sound energy having a second frequency range; and

an acoustic filter network, the acoustic filter network communicating with the single sound outlet and configured to receive the first sound energy, the acoustic filter network including a main branch, a first side branch, and a first chamber, the first side branch communicating with the main branch and the first chamber, the main branch having a first end and a second end and being configured to receive the first sound energy, such that all sound energy radiating from the first receiver portion including the first sound energy passes exclusively through the acoustic filter network before any of the first sound energy radiates out to an exterior environment,

wherein the first receiver portion is coupled to the first end of the main branch and the second receiver portion is coupled to the main branch between the first side branch and the second end of the main branch.

2. The receiver apparatus of claim 1 wherein the main branch and the first side branch comprise at least one tube.

3. The receiver apparatus of claim 1 wherein the main branch and the first side branch comprise at least one groove disposed in at least one plate.

4. The receiver apparatus of claim 3 wherein the at least one plate is disposed on a surface of the receiver housing.

5. The receiver apparatus of claim 1 wherein the main branch and the first side branch comprise at least one pipe.

6. The receiver apparatus of claim 5 wherein the at least one pipe is disposed on a surface of the receiver housing.

7. The receiver apparatus of claim 1 further comprising a second side branch and a second chamber, the second side branch communicating with the main branch and the second chamber.

8. The receiver apparatus of claim 1 further comprising a sound outlet channel, the sound outlet channel communicating with the acoustic filter network and configured to receive filtered first sound energy from the acoustic filter network.

9. The receiver apparatus of claim 8 wherein the sound outlet channel comprises a sound outlet tube.

10. The receiver apparatus of claim 1 wherein the first receiver portion comprises a woofer and the second receiver portion comprises a tweeter.

11. A receiver having an acoustic output, the receiver comprising:

a first transducer disposed within a first housing, the first transducer having an electrical signal input and an acoustic signal output into a first front volume of the first housing;

a second transducer disposed within a second housing, the second transducer having an electrical signal input and an acoustic signal output into a second front volume of the second housing, the second front volume of the second housing acoustically coupled to the acoustic output of the receiver;

an acoustic low pass filter including an acoustic channel having an input port acoustically coupled to the first front volume of the first housing, the acoustic channel of the acoustic low pass filter having an output port acoustically coupled to the acoustic output of the receiver;

an acoustic notch filter including an acoustic channel having an input port acoustically coupled to the first front volume of the first housing, the acoustic channel of the acoustic notch filter having an output port acoustically coupled to a chamber,

all acoustic energy emanating from the first front volume of the first housing filtered by the acoustic low pass filter and the acoustic notch filter,

wherein the acoustic low pass filter and the acoustic notch filter dampen resonant frequencies of the receiver.

12. The receiver of claim 11,

the first transducer having a relatively low frequency response and the second transducer having a relatively high frequency response,

the input port of the acoustic notch filter coupled to the acoustic channel of the acoustic low pass filter, the second front volume of the second housing acoustically coupled to the acoustic channel of the acoustic low pass filter between the acoustic channel of the acoustic notch filter and the output port of the acoustic low pass filter.

13. The receiver of claim 12, the acoustic low pass filter dimensioned to reduce a first resonant frequency peak of the receiver, and the acoustic notch filter dimensioned to reduce a second resonant frequency peak of the receiver.

14. The receiver of claim 11,

the first transducer having a relatively low frequency response and the second transducer having a relatively high frequency response,

the acoustic notch filter coupled directly to the first front volume by the acoustic channel of the notch filter, and

the acoustic low pass filter coupled directly to the first front volume by the acoustic channel of the acoustic low pass filter.

15. The receiver of claim 11, the acoustic low pass filter channel having a dimension that reduces a first resonant frequency peak of the receiver, and the chamber and acoustic channel of the acoustic notch filter having dimensions that reduce a second resonant frequency peak of the receiver.

16. The receiver of claim 11, acoustic energy emanating from the first front volume of the first housing to the acoustic notch filter reflected by the chamber of the acoustic notch filter back toward the first front volume of the first housing.

17. An acoustic receiver having an output, the receiver comprising:

a transducer disposed within a housing, the transducer having an electrical signal input and an acoustic signal output into a front volume of the housing;

an acoustic low pass filter including an acoustic channel having an input port acoustically coupled directly to the front volume of the housing, the acoustic channel of the acoustic low pass filter having an output port acoustically coupled to the receiver output;

an acoustic notch filter including an acoustic channel having an input port acoustically coupled directly to the front volume of the housing, the acoustic channel of the acoustic notch filter having an output port acoustically coupled to a chamber,

all acoustic energy emanating from the first front volume of the first housing propagating to the output of the receiver via either the acoustic low pass filter or the acoustic notch filter,

wherein the acoustic low pass filter and the acoustic notch filter dampen resonant frequencies of the receiver.

18. The receiver of claim 17, acoustic energy emanating from the front volume of the housing to the acoustic notch filter reflected by the chamber of the acoustic notch filter back toward the front volume of the housing.

19. The receiver of claim 17, the acoustic low pass filter channel having a dimension that reduces a first resonant frequency peak of the receiver, and the chamber and acoustic channel of the acoustic notch filter have dimensions that reduce a second resonant frequency peak of the receiver.

20. The receiver of claim 17 further comprising second transducer disposed within a second housing, the second transducer having an electrical signal input and an acoustic signal output into a second front volume of the second housing, the second front volume of the second housing having an output port acoustically coupled to the receiver output.