Patent
Frequency dependent excursion limiter
TLDR
In this article, a circuit and method for the protection of transducers from over excursion, particularly for audio loudspeakers, was proposed for protecting transducers for audio audio speakers.Abstract:
A circuit and method provides for the protection of transducers from over excursion, particularly for the protection of transducers for audio loudspeakers. A frequency dependent excursion limiter circuit has an initial summing stage followed by a shaping filter stage. A clamping function is provided at the summing stage, or at a separate stage between the summing stage and the shaping filter stage, for clamping the driving signal at a predetermined maximum voltage if the driving signal exceeds the predetermined maximum voltage level. The shaping filter stage provides a frequency response shaping function based on a predetermined frequency response shaping criteria which is related to the frequency dependent excursion limits of the transducers being protected from mechanical overload. An inverse shaping filter function is provided at the initial summing stage by providing feedback from the shaping filter stage, thus eliminating the need for a separate inverse shaping filter circuit before clamping. The inverse shaping filter function allows low level signals below clamping to pass through the circuit unaffected. A frequency dependent excursion limiter circuit is also provided in the closed loop circuit of servo feedback system for protecting transducers in a servo feedback system from over excursion.read more
Citations
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References
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Patent
Loudspeaker overload protection circuit
TL;DR: In this article, the output of an audio power amplifier fed to a loudspeaker driver is sensed and when this output exceeds a predetermined level, a switch control circuit operates to place a current limiting device such as a power resistor, in series with one of the driver feed lines, thereby reducing the power fed thereto.
PatentDOI
Loudspeaker with acoustic band-pass filter
TL;DR: In this paper, the transducer is mounted on a dividing wall between the first and second sub-chambers, and a first port couples the first subchamber with the second sub chamber and a second port can communicate with the outside environment surrounding the speaker.
Patent
Loudspeaker-dependent audio compression
TL;DR: In this paper, an audio compression system for reducing distortion arising primarily from excessive loudspeaker excursion is proposed, in which the input audio signal is filtered and the magnitude (or envelope, energy or power) level of the filtered signal is compared to a single, constant threshold level.
PatentDOI
Waveguide electroacoustical transducing
TL;DR: In this paper, the authors describe a loudspeaker system for radiation into the passenger compartment of a vehicle with one or more elongated acoustic waveguides to efficiently transfer sound pressure energy from a speaker driver outside the compartment into the compartment.
Patent
Speaker system protection circuit
William J. Gelow,James B Murphy +1 more
TL;DR: In this article, a circuit and method for protecting speakers and speaker systems from damage due to overload conditions is presented. But the circuit is not suitable for high frequency range speakers, and the circuit cannot handle a large number of speakers.