Automatic detection of loudspeaker characteristics

• US 9,020,153 B2
• Filed: 10/24/2012
• Issued: 04/28/2015
• Est. Priority Date: 10/24/2012
• Status: Expired due to Fees

• Current Assignee: Google LLC (Alphabet Inc.)
• Original Assignee: Google Inc. (Alphabet Inc.)
• Inventors: Britt, Joe Freeman Jr.
• Primary Examiner(s): KIM, PAUL
• Application Number:
  US13/659,529
• Publication Number:
  US 20140112484A1
• Time in Patent Office: 916 Days
• Field of Search: 381/58, 381/59, 381/77
• US Class Current: 381/58
• CPC Class Codes: H04R 29/001 for loudspeakers H04R29/007 takes precedence
• CPC Class Codes: H04S 7/308 Electronic adaptation dependent on speaker or headphone connection

Abstract

Disclosed is subject matter that proposes a system and method for a media device to automatically detect the characteristics of an attached speaker. Speakers have many different characteristics, for example, power, impedance, frequency response, etc. With knowledge of the speaker characteristics, audio output can be equalized appropriately, and an amplifier of the media device, for example, can prevent exceeding the maximum power handling capability of the speaker. Described is a device and method for retrieving information about the speaker from a memory that is coupled to the speaker. A media device can read the data from the memory over existing speaker wires. Software and/or hardware in the media device can optimize the output to the attached speaker. Accordingly, the media device can interrogate the speaker directly over speaker wire to obtain the characteristics of the speaker.

Claims

1. A multimedia device, comprising:

a media interface for connecting to an audio output device via a communication path;

an amplifier for driving the audio output device; and

a processor, the processor configured to;

retrieve in a first communication signal, via the communication path, an identifier of the audio output device;

determine, based on the retrieved identifier, that the audio output device has not been previously connected to the multimedia device;

request, in response to determining that the audio output device has not been previously connected, characteristic information from the audio output device; and

receive, from a second communication signal actively sent by the audio output device and via the communication path, the requested characteristic information of the audio output device; and

determine an output setting for the audio output device based on the characteristic information, wherein the communication path comprises speaker wire.

2. The device of claim 1, wherein the characteristic information of the audio output device is stored in a memory of the audio output device.

3. The device claim 2, wherein the memory is within an enclosure of the audio output device.

4. The device of claim 1, wherein the characteristic information includes a power handling capability of the audio output device.

5. The device of claim 1, wherein the first communication signal is distinguishable by the audio output device from an audio signal that drives the audio output device.

6. The device of claim 1, wherein the first communication signal is indistinguishable by a speaker of the audio output device from an audio signal that drives the speaker and the first communication signal employs a frequency not reproducible as audible sound by the speaker.

7. The device of claim 1, wherein the output setting comprises a compatibility of the audio output device with the amplifier.

8. The device of claim 1, wherein the characteristic information includes information relating to at least one of an impedance, frequency response, sensitivity, dispersion, type, number of drivers, size, enclosure type, and product information.

9. The device of claim 1, wherein the speaker wire comprises a stranded two conductor wire.

10. The device of claim 1, wherein the media interface comprises a first and a second speaker wire binding post.

11. The device of claim 1, wherein the speaker wire conforms to a standardized wire gauge.

12. The device of claim 11, wherein the standardized wire gauge is an American wire gauge (AWG) standard and a gauge of the speaker wire conforms to one of a 10 AWG standard, 12 AWG standard, 14 AWG standard, and a 16 AWG standard.

13. A method of detecting characteristics of an audio output device, comprising:

establishing a communication path to the audio output device;

retrieving in a first communication signal, via the communication path, an identifier of the audio output device;

determining, based on the retrieved identifier, that the audio output device has not been previously connected to the multimedia device;

requesting, in response to determining that the audio output device has not been previously connected, characteristic information from the audio output device; and

receiving, from a second communication signal actively sent by the audio output device and via the communication path, the requested characteristic information of the audio output device; and

determining an output setting for the audio output device based on the characteristic information, wherein the communication path comprises speaker wire.

14. The method of claim 13, wherein the characteristic information of the audio output device is stored in a memory of the audio output device.

15. The method of claim 14, wherein the memory is within an enclosure of the audio output device.

16. The method of claim 13, wherein the characteristic information includes a power handling capability of the audio output device.

17. The method of claim 13, wherein the first communication signal is distinguishable by the audio output device from an audio signal that drives the audio output device.

18. The method of claim 13, wherein the first communication signal is indistinguishable by a speaker of the audio output device from an audio signal that drives the speaker and the first communication signal employs a frequency not reproducible as audible sound by the speaker.

19. The method of claim 13, wherein the output setting comprises a compatibility of the audio output device with the amplifier.

20. The method of claim 13, wherein the characteristic information includes information relating to at least one of an impedance, frequency response, sensitivity, dispersion, type, number of drivers, size, enclosure type, and product information.

21. A multimedia system, comprising:

an audio output device including a speaker and a memory; and

a media device including a media interface for connecting to the audio output device via a speaker wire, an amplifier for driving the speaker, and a processor, the processor configured to;

retrieve in a first communication signal, via the speaker wire, an identifier from the memory of the audio output device;

determine, based on the retrieved identifier, that the audio output device has not been previously connected to the multimedia device;

request, in response to determining that the audio output device has not been previously connected, characteristic information from the audio output device; and

receive, from a second communication signal actively sent by the audio output device and via the speaker wire, the requested characteristic information of the audio output device; and

determine an output setting for the amplifier based on the characteristic information.

22. The system of claim 21, wherein the audio output device is a standalone speaker.