Machine for controlling and amplifying a low-level audio signal using a high efficiency class D switching amplifier
First Claim
1. A circuit for controlling and amplifying a low level audio signal to an output acoustical transducer, comprising a local controller providing said low level audio signal to a high efficiency Class D switching amplifier connected to a said audio transducer, and a power conditioning section for converting AC or DC input power into DC power at the correct voltage for said amplifier.
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Accused Products
Abstract
An audio amplifying circuit and system for amplifying and broadcasting audio signals using high efficiency Class D switching amplifiers, consisting of a battery charger and batteries suitably sized to supply power to the system for operation at full output power for a predetermined time. The system may have a power conditioning section for converting input power directly into the necessary DC voltage used by the class D amplifiers. The system can deliver over 100 watts RMS in a small form factor to a suitable arranged and impedance matched acoustical transducers configured as either a single point acoustic source or in a distributed pattern. The system may provide audio coverage of either indoor or outdoor areas by adjusting the number and type of acoustic transducers, and be activated or controlled either remotely or locally to provide public notification and emergency warning messages.
22 Citations
20 Claims
- 1. A circuit for controlling and amplifying a low level audio signal to an output acoustical transducer, comprising a local controller providing said low level audio signal to a high efficiency Class D switching amplifier connected to a said audio transducer, and a power conditioning section for converting AC or DC input power into DC power at the correct voltage for said amplifier.
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7. A system for broadcasting audio messages, comprising
a local controller having at least one audio message source, said controller connected to a high efficiency Class D switching amplifier, said amplifier connected to an audio transducer, and a power conditioning section for converting AC or DC input power into DC power at the correct voltage for said amplifier.
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12. A system for broadcasting audio messages, comprising
a local controller having at least one audio message source, said controller connected to multiple high efficiency Class D switching amplifiers, each said amplifier being connected to an audio transducer array, and a power conditioning section for converting AC or DC input power into DC power at the correct voltage for said amplifier.
Specification