Audio processing adjustments for playback devices based on determined characteristics of audio content

• US 10,306,364 B2
• Filed: 02/12/2015
• Issued: 05/28/2019
• Est. Priority Date: 09/28/2012
• Status: Active Grant

• Current Assignee: Sonos, Inc.
• Original Assignee: Sonos, Inc.
• Inventors: Sheen, Timothy W., Ericson, Michael Darrell Andrew, Bush, William H.
• Primary Examiner(s): Jamal, Alexander
• Application Number:
  US14/620,937
• Publication Number:
  US 20150163596A1
• Time in Patent Office: 1,566 Days
• Field of Search: 381 99, 381100, 381 98
• CPC Class Codes: H04R 2227/003 Digital PA systems using, e.g. LAN or internet
• CPC Class Codes: H04R 2227/005 Audio distribution systems for home, i.e. multi-room use
• CPC Class Codes: H04R 2420/07 Applications of wireless loudspeakers or wireless microphones
• CPC Class Codes: H04R 2430/00 Signal processing covered by H04R, not provided for in its groups
• CPC Class Codes: H04R 2430/01 Aspects of volume control, not necessarily automatic, in sound systems
• CPC Class Codes: H04R 27/00 Public address systems circuits for preventing acoustic reaction H04R3/02; circuits for distributing signals to loudspeakers H04R3/12; monitoring or testing arrangements for public address systems H04R29/007; amplifiers H03F
• CPC Class Codes: H04R 3/04 for correcting frequency response
• CPC Class Codes: H04R 3/14 Cross-over networks

Abstract

Methods and systems are provided for adjusting a crossover frequency between a plurality of audio speakers rendering audio content. In one example, a first subset of a plurality of audio speakers may be rendering a first sub-range of a range of audio frequencies of an audio content, and a second subset of speakers of the plurality of audio speakers may be rendering a second sub-range of the range of audio frequencies. In this example, the first sub-range and the second sub-range may be substantially separated at the crossover frequency. In one case, a characteristic of the audio content may be determined, and the crossover frequency may be adjusted based on the determined characteristic to help improve the audio content rendering quality by the respective subsets of audio speakers in the plurality of audio speakers.

Claims

1. A method comprising:

receiving, via a network interface of a first playback device, digital data representing audio content at the first playback device;

receiving, via a network interface of a second playback device, digital data representing the audio content at the second playback device;

processing, via an audio processing component, the digital data representing the audio content into a digital audio signal including samples that form an audio waveform representing the audio content;

rendering a first portion of the audio content via the first and second playback devices such that;

(i) the first playback device outputs the first portion of the audio content (a) above an output power level for frequencies within a first frequency range and (b) below the output power level for frequencies within a second frequency range, wherein each frequency of the first frequency range is higher than each frequency of the second frequency range, and wherein rendering the first portion of the audio content comprises the first playback device (a) filtering the first portion of the audio content to separate the first portion of the audio content into the frequencies within the first frequency range and the frequencies within the second frequency range for output; and

(ii) the second playback device outputs the first portion of the audio content (a) above the output power level for frequencies within the second frequency range and (b) below the output power level for frequencies within the first frequency range, wherein rendering the first portion of the audio content comprises the second playback device filtering the first portion of the audio content to separate the first portion of the audio content into the frequencies within the first frequency range and the frequencies within the second frequency range for output;

while rendering the first portion of the audio content, determining, based on a portion of the digital audio signal representing a second portion of the audio content, that the second portion of the audio content includes relatively higher sound pressure levels in bass frequencies than the first portion of the audio content; and

based on determining that the second portion of the audio content includes relatively higher sound pressure levels in bass frequencies than the first portion of the audio content, adjusting, for the second portion of the audio content, the rendering of the audio content such that;

(i) the first playback device outputs the second portion of the audio content (a) above the output power level for the frequencies of the first frequency range and (b) above the output power level for frequencies within a portion of the second frequency range, wherein rendering the second portion of the audio content comprises the first playback device filtering the second portion of the audio content to separate the second portion of the audio content into the frequencies within the first frequency range and the frequencies within the portion of the second frequency range for output;

or

(ii) the second playback device outputs the second portion of the audio content (a) above the output power level for the frequencies of the second frequency range and (b) above the output power level for frequencies within a portion of the first frequency range, wherein rendering the second portion of the audio content comprises the second playback device filtering the second portion of the audio content to separate the second portion of the audio content into the frequencies within the portion of the first frequency range and the frequencies within the second frequency range for output.

2. The method of claim 1, wherein the frequencies of the first frequency range comprise frequencies up to 80 Hz, and wherein adjusting the rendering comprises adjusting the rendering such that the first playback device outputs the second portion of the audio content above the output power level for frequencies up to 120 Hz.

3. The method of claim 1, wherein the frequencies of the first frequency range comprise frequencies up to 120 Hz, and wherein adjusting the rendering comprises adjusting the rendering such that the second playback device outputs the second portion of the audio content above the output power level for frequencies between 80 and 120 Hz.

4. The method of claim 1, wherein the output power level is at least half of a maximum power level of the audio content for frequencies within the first frequency range.

5. The method of claim 1, wherein the output power level is at least half of a maximum power level of the audio content for frequencies within the second frequency range.

14. The method of claim 1, further comprising:

determining a characteristic of a first portion of the audio content, wherein rendering the first portion of the audio content via the first and second playback devices comprises rending the first portion of the audio content based on the determined characteristic of the first portion of the audio content.

15. The method of claim 1, wherein determining that the second portion of the audio content includes relatively higher sound pressure levels in bass frequencies than the first portion of the audio content comprises a third playback device operably coupled to the first and second playback devices determining that the second portion of the audio content includes relatively higher sound pressure levels in bass frequencies than the first portion of the audio content and wherein adjusting the rendering of the audio content by comprises the third playback device sending the first and second playback devices instructions to adjust the rendering of the audio content.

16. The method of claim 1, wherein determining that the second portion of the audio content includes relatively higher sound pressure levels in bass frequencies than the first portion of the audio content comprises the first playback device determining that the second portion of the audio content includes relatively higher sound pressure levels in bass frequencies than the first portion of the audio content and wherein adjusting the rendering of the audio content comprises the first playback device sending the second playback device instructions to adjust the rendering of the audio content.

19. The method of claim 1, wherein the first portion and the second portion are in non-continuous sections of the audio content.

6. A system comprising:

a first playback device configured to receive, via a network interface of the first playback device, audio content and render a first portion of the audio content such the first playback device outputs the first portion of the audio content (a) above an output power level for frequencies within a first frequency range and (b) below the output power level for frequencies within a second frequency range, wherein each frequency of the first frequency range is higher than each frequency of the second frequency range, and wherein rendering the first portion of the audio content comprises the first playback device filtering the first portion of the audio content to separate the first portion of the audio content into the frequencies within the first frequency range and the frequencies within the second frequency range for output;

a second playback device configured to receive audio content and render the audio content such that the second playback device outputs the first portion of the audio content (a) above the output power level for frequencies within the second frequency range and (b) below the output power level for frequencies within the first frequency range, wherein rendering the first portion of the audio content comprises the second playback device filtering the first portion of the audio content to separate the first portion of the audio content into the frequencies within the first frequency range and the frequencies within the second frequency range for output;

at least one processor;

a non-transitory computer readable medium; and

program instructions stored on the non-transitory computer readable medium and executable by the at least one processor to perform functions comprising;

processing, via an audio processing component, the digital data representing the audio content into a digital audio signal including samples that form an audio waveform representing the audio content;

determining, based on a portion of the digital audio signal representing a second portion of the audio content, that the second portion of the audio content includes relatively higher sound pressure levels in bass frequencies than the first portion of the audio content while the first and second playback devices are rendering the first portion of the audio content; and

based on determining that the second portion of the audio content includes relatively higher sound pressure levels in bass frequencies than the first portion of the audio content, adjusting, for the second portion of the audio content, the rendering of the audio content by the first and second playback devices such that;

(i) the first playback device outputs the second portion of the audio content (a) above the output power level for the frequencies of the first frequency range and (b) above the output power level for frequencies within a portion of the second frequency range, wherein rendering the second portion of the audio content comprises the first playback device filtering the second portion of the audio content to separate the second portion of the audio content into the frequencies within the first frequency range and the frequencies within the portion of the second frequency range for output;

or

(ii) the second playback device outputs the second portion of the audio content (a) above the output power level for the frequencies of the second frequency range and (b) above the output power level for frequencies within a portion of the first frequency range, wherein rendering the second portion of the audio content comprises the second playback device filtering the second portion of the audio content to separate the second portion of the audio content into the frequencies within the portion of the first frequency range and the frequencies within the second frequency range for output.

7. The system of claim 6, further comprising a third playback device operably coupled to the first and second playback devices, wherein the third playback device comprises the at least one processor and the non-transitory computer readable medium, and wherein adjusting the rendering of the audio content by the first and second playback devices comprises the third playback device sending the first and second playback devices instructions to adjust the rendering of the audio content.

8. The system of claim 6, wherein the first playback device comprises the at least one processor and the non-transitory computer readable medium, and wherein adjusting the rendering of the audio content by the first and second playback devices comprises the first playback device sending the second playback device instructions to adjust the rendering of the audio content.

9. The system of claim 6, wherein the second playback device comprises the at least one processor and the non-transitory computer readable medium, and wherein adjusting the rendering of the audio content by the first and second playback devices comprises the second playback device sending the first playback device instructions to adjust the rendering of the audio content.

10. The system of claim 6, wherein the frequencies of the first frequency range comprise frequencies up to 80 Hz, and wherein adjusting the rendering comprises adjusting the rendering such that the first playback device outputs the audio content above the output power level for frequencies up to 120 Hz.

11. The system of claim 6, wherein the frequencies of the first frequency range comprise frequencies up to 120 Hz, and wherein adjusting the rendering comprises adjusting the rendering such that the second playback device outputs the audio content above the output power level for frequencies between 80 and 120 Hz.

12. The system of claim 6, wherein the output power level is at least half of a maximum power level of the audio content for frequencies within the first frequency range.

13. The system of claim 6, wherein the output power level is at least half of a maximum power level of the audio content for frequencies within the second frequency range.

17. The system of claim 6, wherein determining that the second portion of the audio content includes relatively higher sound pressure levels in bass frequencies than the first portion comprises a third playback device operably coupled to the first and second playback devices determining that the second portion of the audio content includes relatively higher sound pressure levels in bass frequencies than the first portion of the audio content and wherein adjusting the rendering of the audio content by comprises the third playback device sending the first and second playback devices instructions to adjust the rendering of the audio content.

18. The system of claim 6, wherein determining that the second portion of the audio content includes relatively higher sound pressure levels in bass frequencies than the first portion of the audio content comprises the first playback device determining that the second portion of the audio content includes relatively higher sound pressure levels in bass frequencies than the first portion of the audio content and wherein adjusting the rendering of the audio content comprises the first playback device sending the second playback device instructions to adjust the rendering of the audio content.

20. The system of claim 6, wherein the first portion and the second portion are in non-continuous sections of the audio content.