Speaker protection for surround sound systems

Patent metadata

Field	Value
Publication number	US-9549256-B2
Application number	US-201514615180-A
Country	US
Kind code	B2
Filing date	Feb 5, 2015
Priority date	Feb 7, 2014
Publication date	Jan 17, 2017
Grant date	Jan 17, 2017

Abstract

An audio/video receiver configured to limit the power delivered to its speakers based on real time calculations. First, power delivered to the speakers is limited to the power rating of the speakers during short durations. Second, a secondary longer time constant Root-Mean-Square (RMS) detector limits sustained power to the speakers for a predetermined fraction of the peak power rating.

First claim

What is claimed is:

1. An audio-video system for providing audio content to one or more speakers from an audio-video receiver, the audio-video receiver comprising:
an amplifier;
a digital-to-analog converter; and
a Digital Signal Processor adapted to limit a peak power delivered to the one or more speakers according to predefined calibration parameters, the predefined calibration parameters comprising;
a maximum power of the one or more speakers;
an impedance of the one or more speakers;
an amplifier gain of the amplifier; and
a maximum output voltage of the digital-to-analog converter.

2. The audio-video system of claim 1 , wherein the one or more speakers are surround speakers.

3. The audio-video system of claim 1 , wherein the amplifier is a multi-channel amplifier.

4. The audio-video system of claim 1 , wherein the calibration parameters further comprises:
a predefined duration, whereby the Digital Signal Processor further limits the peak power delivered to the one or more speakers according to the predefined duration.

5. The audio-video system of claim 4 , wherein the audio-video receiver further comprises:
a memory adapted to store the calibration parameters specific to the one or more speakers, wherein the audio content is limited based at least in part on the calibration parameters.

6. An audio-video system for preventing damage to one of more audio speaker coils of one or more surround speakers, the audio-video system comprising:
a memory adapted to store a volume trim that balances a sound pressure level of the one or more surround speakers, an impedance of the the one or more surround speakers, and a power rating of the surround speakers;
an audio-video receiver;
a multi-channel amplifier;
a digital-to-analog converter; and
a digital signal processor adapted to limit a peak power delivered to the one or more surround speakers.

7. The system of claim 6 , wherein
the memory stores a predefined limiting duration for the digital signal processor to further limit the peak power delivered to the one or more surround speakers according to the predefined limiting duration.

8. The system of claim 7 , further comprising:
a mobile computing device running a graphically based commissioning software for communicating the volume trim, the impedance, the the power rating, the peak power, and the predefined limiting duration to the audio-video receiver.

Assignees

• Crestron Electronics Inc

Inventors

• Labosco Mark
• Burke David
• Marra Alexander

Classifications

• H04N5/607

  for more than one sound signal, e.g. stereo, multilanguages (H04N5/602 takes precedence) · CPC title

• H04R3/007 Primary

  Protection circuits for transducers · CPC title

• H03G7/002

  in untuned or low-frequency amplifiers, e.g. audio amplifiers (H03G7/007, H03G7/001, H03G7/008, H03G7/02, H03G7/06 take precedence) · CPC title

• H04R2430/01

  Aspects of volume control, not necessarily automatic, in sound systems · CPC title

• H04N5/602

  for digital sound signals · CPC title