Patent Review: Improved Speaker Structure by Jazz Hipster

This article reviews a patent application submitted in 2010 by to two inventors, on behalf of Jazz Hipster Corp. (Taiwan), regarding an improved structure of a speaker using the surround to reduce the resistance of the diaphragm excursion, which helps to generate a more linear diaphragm movement, with less resistance, and reduced distortion. As James Croft noted, the approach had been used in the past, but its use decreased due to the high-performance achieved with well-designed roll-surrounds, at a lower cost. No surprisingly this patent was subsequently abandoned.

B&K Precision continues to deliver on its promise of delivering reliable and cost-effective test and measurement instruments and announced the expansion of its bench LCR meter family with the addition of two new models that extend the family's test frequencies up to 1 MHz. B&K Precision's new 894 and 895 bench LCR meters provide test frequencies from 20 Hz to 500 kHz and 20 Hz to 1 MHz, respectively, and can measure inductance, capacitance and resistance with 0.05% basic impedance accuracy.

B&K Precision announced the expansion of its current 878B and 879B 40,000-count handheld LCR meters with the addition of a new 100 kHz model, the 880. This new portable LCR meter can measure inductance, capacitance, and resistance with 0.1% basic impedance accuracy. Offering many features typically found only in bench LCR meters, the 880 provides test frequencies up to 100 kHz, selectable test signal levels, and 4-terminal measurement capabilities.

Hal Leonard published the book “Electronics Concepts, Labs, and Projects, Essential Electronics Theory for the Audio World” by Alden Hackmann. This is a complete introduction to essential theory relating to electronics principles specific to the audio world, including practical lessons on basic things from soldering to how to use an oscilloscope and function generator to diagnose circuits.