Design Con 2015
Breaking News
Comments
Newest First | Oldest First | Threaded View
Guru of Grounding
User Rank
Rookie
re: Active Noise Reduction: Can you really be within one percentage point of perfection?
Guru of Grounding   5/6/2010 3:12:14 AM
NO RATINGS
Ahh, marketing - the art of deception by obfuscation or omission (in the name of appealing to the general public)!! For Jon_B's information, both the Volt and Bel are units derived from proper names Count Alessandro Giuseppe Antonio Anastasio Volta and Alexander Graham Bell, respectively.

timbo_in_test
User Rank
Rookie
re: Active Noise Reduction: Can you really be within one percentage point of perfection?
timbo_in_test   4/30/2010 8:00:17 PM
NO RATINGS
I'd write dB and mV - but I can't remember ever writing either out longhand! If you need to explain what meant by a mV you may be writing for the wrong audience (or do I mean readership?), if you need to explain dB you problably dispair at the inadequacy of the educational system! I do remember several years ago giving a presentation in a lecture theatre that was fully equiped by an active noise cancellation system; it was an intriguing and slightly weird experience. I had to give my presentation to a technician in the control room and the system had a monitor speaker that could be switched to reproduce the subtracted sound. This was a multichannel system and I started to wonder about the possibility of building a multichannel system that could monitor individual conversations anywhere in the auditorium. Has anyone ever done this?

Marcel..2
User Rank
Rookie
re: Active Noise Reduction: Can you really be within one percentage point of perfection?
Marcel..2   4/28/2010 9:21:02 AM
NO RATINGS
So what, Job_B...maybe it differs in some odd corners in the world, the US for example...any "relevant" comments to throw in?

Jon_B
User Rank
Rookie
re: Active Noise Reduction: Can you really be within one percentage point of perfection?
Jon_B   4/28/2010 8:07:41 AM
NO RATINGS
The author's nomenclature made me cringe. I was taught that it's decibels and millivolts, not deciBels and milliVolts - only the abbreviation has a capital letter when the unit is named in honour of a person. http://ewh.ieee.org/soc/ias/pub-dept/abbreviation.pdf http://physics.nist.gov/cuu/pdf/sp811.pdf

Frank Eory
User Rank
CEO
re: Active Noise Reduction: Can you really be within one percentage point of perfection?
Frank Eory   4/22/2010 8:07:55 PM
NO RATINGS
This was an interesting refresher on the definition of the dB as it is used in electronics and in acoustics. The author's implication about the dishonesty of such marketing relies solely on his perceived lack of understanding of dBs vs. percentages by the consumer. I don't believe that such a lack of understanding is very prevalent in the world of audio, and certainly not among audiophiles. Imagine if the topic was THD instead of noise cancellation. No audiophile would be impressed by a THD of 1%. This is just another way of saying that in some contexts, being within 1% of perfection just isn't terribly impressive performance.

bcarso
User Rank
Rookie
re: Active Noise Reduction: Can you really be within one percentage point of perfection?
bcarso   4/22/2010 4:57:08 PM
NO RATINGS
Not a bad little piece. Some references would help, and the man's name was Stevens, not Stephens. A wonderful remembrance can be found here: http://books.nap.edu/html/biomems/sstevens.pdf



Top Comments of the Week
Flash Poll
Like Us on Facebook

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
EE Life
Frankenstein's Fix, Teardowns, Sideshows, Design Contests, Reader Content & More
Carlos Bueno

Adventures in Userland
Carlos Bueno
Post a comment
Editor’s Note: Excerpted from Lauren Ipsum: A Story About Computer Science and Other Improbable Things, author Carlos Bueno introduces us to Lauren and her adventures in Userland. ...

Max Maxfield

Tired Old iPad 2 vs. Shiny New iPad Air 2
Max Maxfield
9 comments
I remember when the first iPad came out deep in the mists of time we used to call 2010. Actually, that's only four years ago, but it seems like a lifetime away -- I mean; can you remember ...

Martin Rowe

Make This Engineering Museum a Reality
Martin Rowe
Post a comment
Vincent Valentine is a man on a mission. He wants to make the first house to ever have a telephone into a telephone museum. Without help, it may not happen.

Rich Quinnell

Making the Grade in Industrial Design
Rich Quinnell
16 comments
As every developer knows, there are the paper specifications for a product design, and then there are the real requirements. The paper specs are dry, bland, and rigidly numeric, making ...

Special Video Section
The LT8640 is a 42V, 5A synchronous step-down regulator ...
The LTC2000 high-speed DAC has low noise and excellent ...
How do you protect the load and ensure output continues to ...
General-purpose DACs have applications in instrumentation, ...
Linear Technology demonstrates its latest measurement ...
10:29
Demos from Maxim Integrated at Electronica 2014 show ...
Bosch CEO Stefan Finkbeiner shows off latest combo and ...
STMicroelectronics demoed this simple gesture control ...
Keysight shows you what signals lurk in real-time at 510MHz ...
TE Connectivity's clear-plastic, full-size model car shows ...
Why culture makes Linear Tech a winner.
Recently formed Architects of Modern Power consortium ...
Specially modified Corvette C7 Stingray responds to ex Indy ...
Avago’s ACPL-K30T is the first solid-state driver qualified ...
NXP launches its line of multi-gate, multifunction, ...
Doug Bailey, VP of marketing at Power Integrations, gives a ...
See how to ease software bring-up with DesignWare IP ...
DesignWare IP Prototyping Kits enable fast software ...
This video explores the LT3086, a new member of our LDO+ ...
In today’s modern electronic systems, the need for power ...