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December 1999 -  For immediate release ...


New Application Note From THAT Helps Power Speaker Designs


Milford , MA - Because the amplifier always drives a known load, powered speakers present unique design opportunities not available in separate components. THAT Corporation's new application note AN104, "Improving Loudspeaker Signal Handling Capability" shows how to design a single-chip, frequency-dependent compressor/limiter circuitry into next-generation powered speaker products. This processor is suitable for most types of powered speakers, and along with providing driver protection, allows the system to be driven to higher levels without audible clipping or distortion.

The circuit requires only one integrated circuit, the THAT 4301 Analog Engine®, and a handful of passive components to implement its "intelligent" signal handling capability. At normal signal levels, the processor is essentially a unity gain buffer. However, as the levels increase to near the overload point of either the driver or the amplifier, the processor begins compressing, and ultimately limiting, the low-frequency portion of the signal (where distortion and clipping are most likely to occur). With its use of rms-level detection (to minimize the "drop out" effect that often occurs with peak limiters), judicious choice of time constants, and a high-performance VCA, the circuit can extend the headroom of the speaker system without noticeable degradation in sonic performance.

AN104, along with other analog signal processing application notes, is available in .pdf format on our Design Notes page. THAT's application engineers are also available for Technical Support to help meet particular design requirements.

About THAT Corporation
THAT Corporation, founded in 1989, designs and sells high-performance analog integrated circuits for professional audio manufacturers. THAT’s ICs include analog input and output stages, digitally controlled low-noise preamplifiers, Analog Engines® and its original line of voltage-controlled amplifiers (VCAs) – all used throughout the pro audio industry. The company also licenses patents, trademarks, and other intellectual property to the TV broadcast and reception industries. Licensed products include the dbx-tv® Total™ series of audio enhancement technology and digital implementations of legacy TV audio receiver standards. The company is headquartered in Milford, Massachusetts, with offices in Milpitas, California.

For more information, contact:
  THAT Corporation, 45 Sumner Street, Milford, MA 01757-1656 , USA
  Telephone: +1 (508) 478-9200; Fax +1 (508) 478-0990

Editorial Contact:
  Ken Nevard, IC Marketing Manager
  Tel: +1 (508) 478-9200 x108


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