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USB amplifier delivers loudspeaker audio fidelity

Posted: 23 Aug 2010 ?? ?Print Version ?Bookmark and Share

Keywords:audio amplifier? USB? speakers?

 DyadUSB amplifier module

NXT plc, has just announced their high efficiency, USB-powered stereo amplifier module that brings boost audio power of 15W per channel from a standard USB port. Assimilating NXT's recently acquired Audium amplifier chip technology, the DyadUSB amplifier module is now incorporated with NXT's Balanced Mode Radiator (BMR) speakers. The BMRs utilize NXT's patented Bending Wave Technology, harmonizing flat panel and pistonic sound generation, which is then used to produce compact, wide bandwidth and wide directivity loudspeakers.

This optimization for utility with BMR drivers also includes the option of on-chip digital filtering for acoustic voicing, bass enhancement, stereo widening as well as driver protection, and an implementation of a Zobel network to accurately match the driver's inductance to the amplifier's output drive.

Currently, BMR drivers are widely available in consumer audio products ranging from high-end audiophile loudspeakers to mass-market, flat panel TVs. The DyadUSB platform may be fitted into compact desktop and travel speakers to deliver Hi-Fi in computer-centric applications, wherein an external power source is undesirable. Such technology is designed for notebook or netbook add-on speaker applications where minimal power consumption is required to prolong battery life without audio fidelity compromise, especially for music and video entertainment use.

The DyadUSB platform has been announced less than five months after NXT's acquisition of an IP from Audium Semiconductor, developers of the amplifier chip on which the design is based. The chip employs power rail switching enabling it to operate efficiently even from a predominantly low voltage supply. Upon scrutiny, a boost regulator may be noted to deliver a higher operating voltage to the output transistors on audio peaks. Other patented techniques minimize fixed power losses as well as output-dependent variable losses.

Pricing and availability: The DyadUSB platform is now being demonstrated to key customers. Mass production is scheduled for early 2011. The amplifier, together with a pair of 40mm x 40mm BMR drive units, will cost approximately $50 at a minimum order of 100 units.

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