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USB-powered stereo amplifier boosts audio power

Posted: 25 Aug 2010     Print Version  Bookmark and Share

Keywords:audio amplifier  USB  speakers  BMR 

NXT plc unveils the DyadUSB, a high efficiency, USB-powered stereo amplifier module that brings boost audio power of 15W per channel from a standard USB port. The DyadUSB amplifier module, assimilated using NXT's recently acquired Audium amplifier chip technology, is now incorporated with NXT's Balanced Mode Radiator (BMR) speakers. The BMRs utilise 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.

 DyadUSB amplifier module

This optimisation 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 minimise fixed power losses as well as output-dependent variable losses.

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 Rs.2,348.44 ($50) at a minimum order of 100 units.





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