Digital power link audio distribution system and components thereof
First Claim
1. A powered speaker unit employing a class D amplifier for reproducing sound, comprising:
- a digital power link in port for receiving a single cable carrying a digital audio signal and electrical power;
a digital power amplifier powered by said electrical power received in said digital power link in port, said digital power amplifier using pulse-width-modulated digital signals to switch an output power amplifier device, thereby generating an analog audio signal; and
,at least one speaker driver for reproducing sound based upon the analog audio signal;
wherein the digital power link in port, the digital power amplifier, and the at least one speaker driver are integrated into a powered speaker unit.
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Accused Products
Abstract
An audio distribution system in one embodiment includes a master device, a powered speaker unit, and an expander device. The master device has an output port for receiving a cable carrying an electrical power signal along with a digital audio signal. The speaker unit includes a first port for receiving the electrical power signal and the digital audio power signal, and a second port for sending the signals. A digital-to-analog converter in the speaker unit converts the digital audio signal to an analog audio signal, and a speaker driver uses the signal to produce sound. The expander device is electrically connectable to the second port of the speaker unit for providing electrical power to one or more further speaker units. In another embodiment, the invention provides a master mixer device and a speaker unit. The master mixer device includes a digital signal processor for receiving and separately processing a speech channel having digital audio containing speech content and a music channel having digital audio containing music content. In an embodiment a powered speaker unit employing a class D amplifier for reproducing sound is further disclosed. A digital power link in port is provided in the powered speaker for receiving a cable carrying a digital audio signal and electrical power.
26 Citations
15 Claims
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1. A powered speaker unit employing a class D amplifier for reproducing sound, comprising:
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a digital power link in port for receiving a single cable carrying a digital audio signal and electrical power; a digital power amplifier powered by said electrical power received in said digital power link in port, said digital power amplifier using pulse-width-modulated digital signals to switch an output power amplifier device, thereby generating an analog audio signal; and
,at least one speaker driver for reproducing sound based upon the analog audio signal; wherein the digital power link in port, the digital power amplifier, and the at least one speaker driver are integrated into a powered speaker unit. - View Dependent Claims (2, 3, 4)
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5. A powered speaker unit employing a class D amplifier for reproducing sound, comprising:
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A digital power link in port for receiving a cable carrying a first digital audio signal and electrical power; a link out port for conducting a second digital audio signal; a digital power amplifier powered by said electrical power received in said digital power link in port, said digital power amplifier using pulse-width-modulated digital signals to switch an output power amplifier, thereby generating at least one analog audio signal; and
,at least one speaker driver for receiving the analog audio signal and reproducing sound in accordance therewith; wherein the link in port, the link out port, the digital power amplifier, and the at least one speaker driver are integrated into a powered speaker unit. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification