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Meetings and other Notices
  The Boston Audio society now has our own YouTube channel: https://www.youtube.com/channel/UC5B5vIQjWwm4CnsQBrgy2IA

November 2022

Online Meeting Notice

Date: Saturday, November 19, 2022, 2:00 PM

Place: ZOOM On-line

Guests: Alvin Foster, Secretary & Nick Noiseux, President of the Boston Audio Society

Topic: Reports on the 2022, 153rd AES Convention in NYC

The Audio Engineering Society’s (AES) New York 2022 Convention was held at the Jacob Javits Center. It ran for about a week: October 19-27. The open and free exhibit days were 19-20. Nick Noiseux and Alvin Foster traveled to the Convention to interview many exhibitors connected to our audio-video hobby.

The Convention Hall includes multiple rooms for seminars, research, and presentations. The exhibit floor space is about the size of a football field. On display are equipment and software to enhance professional audio-video users. The NAB show was held at the same time in the other half of the hall.

Alvin and Nick conducted several interviews with manufacturers whose products match our BAS interests. The interviews included virtual reality (VR) and compatible microphones. This Saturday’s, 45-minute video-interview was with Svein Berge, CEO of Harpex Audio and the maker of the brand new, 84-capsule SpcMic. The near ping pong shaped paddle includes 84-MEMS capsules.

What is a MEMS microphone? A MEMS (Micro Electro Mechanical Systems) mic is a pressure-sensitive diaphragm etched into a silicon wafer via MEMS processing. MEMS mics are largely based on electret capsules and the SpcMic has onboard preamps and analog-to-digital converters. MEMS mics are also known as mic chips or silicon mics.

SpcMic’s almost triangular shaped paddle is flat, defying the typical spherical form adopted by others seeking higher order Ambisonics. During our interview, Svein made the case for the unusual structure and size of his $2400 High order Ambisonic microphone. www.spcmic.com

Join the Zoom Meeting !

Ken Schwarz is inviting you to a scheduled Zoom meeting.

Time: Saturday, November 19, 2022, ~ 2:00 PM Eastern until 4:00 PM

https://us02web.zoom.us/j/89414786087?pwd=aG8wMFFKaXZuejR3TEJQOThISkhrUT09

Meeting ID: 894 1478 6087

Passcode: 989644

IF you are viewing this on a phone or tablet, you can and should download the ZOOM APP.

You can ALSO click on this link and simply DIAL IN to participate:
https://us02web.zoom.us/u/kcgU8tvYvR

If you are using a computer and this is your first time with Zoom, please give yourself at least 15-20 minutes prior to the meeting to set things up: click on the link in the Zoom instructions below and you will be guided to download the Zoom software, HERE: https://zoom.us/download

You can use your computer’s audio if you have a headset attached, or you can dial-in for audio. If you have a smart phone or tablet and a good internet connection, then you should install the Zoom app for your device and connect using it.

THE BAS MESSAGE
November 2022

Moths and Bats

Bats and moths have been involved in an acoustic arms race between predator and prey ever since bats evolved echolocation some 65 million years ago.

Researchers found that moth wings proved to be excellent sound absorbers, even when on top of an acoustical solid substrate, with the wings absorbing as much as 87% of the incoming sound energy. The effect is also broadband and omnidirectional, covering a wide range of frequencies and sound incident angles.

"What is even more impressive is that the wings are doing this whilst being incredibly thin, with the scale layer being only 1/50th of the thickness of the wavelength of the sound that they are absorbing," explained lead author Dr. Thomas Neil. "This extraordinary performance qualifies the moth wing as a natural occurring acoustic absorbing metasurface, a material that has unique properties and capabilities, that are not possible to create using conventional materials."

https://phys.org/news/2022-06-moth-winginspired-absorbing-wallpaper-sight.html


email me here

WEBMASTER'S NOTE: But before you go batty trying to catch a moth, don't forget our very own master acoustics reference page here:
https://www.bostonaudiosociety.org/links3.htm

Below, other meetings and notices which
may be of interest to BAS members

MAHLER 3

In the recent (April 2022) performance of Mahler’s Third Symphony at Boston's Symphony Hall by Ben Zander and his Boston Philharmonic, the recording was done with the three main spaced omnis with two more farther back. No accent mikes or chorus microphones were used nor, it turns out, were they needed. Remarkably, this produced a recording that is as close to the Symphony Hall experience as may be possible.

The info is here: www.bostonphil.org/concerts/2021-2022/bpo4-mahler3

Here is the recording in its entirety as a single .WAV file; 44k / 16 bit; 1hr 47 min
Mahler Sym 3 CD.wav  1.1GB  
(For those of you with editing software note that the .wav file HAS markers to denote the movements.)

Here is the exact same Symphony 3 with the movements separated as FLAC files, 48k / 24 bit as a ZIPped file: Mahler 3 Zander as FLAC.zip  1GB

IF you'd like further Gustav Mahler info... https://en.wikipedia.org/wiki/Gustav_Mahler


Shop Talk

Shop Talk was a WBUR program about Hi Fidelity, music, speakers, tape recorders, etc. Enjoyed by many during the 1970s, the program's format was ‘talk’ and interviewing major audio luminaries. It was a forerunner of the popular program Car Talk!

Peter Mitchell and Dr. Richard Goldwater were the original hosts. They were later joined by Brad Meyer. Here, John Allen interviews Scott Kent:

Shop Talk John Allen talks to Scott Kent on SPEAKERS.mp3   (81Mb 1:27)

Shop Talk John Allen talks to Scott Kent on TAPE RECORDERS.mp3  (79Mb  1:26)

There is also an episode track on the BAS CD and here is that Description:

Track 12. "Shop Talk", WHRB-FM, November 5, 1984.
Peter Mitchell (on the left), Richard Goldwater, MD (center) and E. Brad Meyer (right) introduce the show with a 1932 stereo recording and prepare to talk with guests Mark Davis and David Moran, both then of dbx corporation.

Shop Talk, which through most of its ten-year life on WBUR featured just Mitchell and Goldwater, was the precursor of Tom and Ray Magliozzi's "Car Talk". As we finished our 9:00-10:30 stint every Saturday morning, Tom and Ray would take our places and begin joking with each other. Eventually the station manager figured out that they were funnier than we were, and that more people drove cars than owned hi-fi equipment, and fired us. Until then, the show publicized the Boston Audio Society, vastly increasing attendance at our monthly meetings. The show came back for a time during the '80's on the Harvard station WHRB, where we appeared once a month as guests of HRB stalwart David Elliott. [EBM]


BAS MICROPHONE CLINIC REPORT !
In September 2009 the B A S held a microphone clinic, testing 37 different microphone models. The ambitious nature of the clinic effort, the extent of data collection, the number of individuals involved in microphone testing and in writing various sections of the report, and the complexity in determining how to construct the clinic report and make it available to members resulted it not being published until now. The dataset is extensive.

Representative samples were included in the abbreviated report in "The B A S Speaker"
(Fall 2015; v37n3)

Go to the MICROPHONE CLINIC PAGE for more...

...and don't forget, here is the master list of microphones in the world


When collecting and plotting "noisy" data it is often useful to have Microsoft Excel plot a Trend Line through it.  If that data is to be used for further work, it may be necessary to have an X-Y table of the Trend Line. That is not easy to get and this paper will show how to do it.
Joseph DeMarinis has an article here: Extracting Numerical Data from an Excel Trend Line

Foster's Test Bench !
by Alvin Foster !    Click the logo: —>
The rapidly-becoming-famous BAS Headphone Test Article is now available in the BASS VOLUME 25, ISSUE 4, on Page 17, available HERE   PDF 3mb
Visit our PODCAST PAGE for:
The LIVE video podcast of our meetings,
Archived video of past meetings (only one so far!),
and Audio Podcast interviews by Alvin Foster
There is a supplemental and further explanation addendum paper to the E. Brad Meyer / David Moran paper published in the September, 2007 issue of the AES Journal. That page, which documents the experimental protocol and audio systems/source material is here:
www.bostonaudiosociety.org/explanation.htm   
There is a Power Point Presentation of the lecture given by Dr. Barry Blesser at the March 2007 Meeting. The Meeting page synopsis is HERE; the Power Point Presentation (as a web page) is HERE

Some earlier BASS issues, previously available only directly by mail, are now available online, on the BAS SPEAKER page, HERE

Show your appreciation for the immense amount of dedicated work that went into both the original writing, gathering, editing and printing, PLUS the more recent scanning and conversion to PDF format, by joining the Society, HERE !


A L L   O F F S I T E   L I N K S   O P E N   I N T O   A   N E W  T A B  O R  W I N D O W

- AND FOR CONVENIENCE -

AES Future Meetings
www.bostonaes.org

Acoustical Society of America
www.gbcasa.org
SMPTE New England
www.smpte-ne.org

There is a posting of an ABX article, The Digital Challenge by Stanley P. Lipshitz HERE


 

The Boston Audio Society
PO BOX 260211
Boston MA 02126


updated 11/17/22