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

September 2022 ONLINE MEETING

Date: Saturday, September 3, 2022, 2:00 PM

Place: ZOOM

FEATURED GUEST: CEO of Zylia, Tomasz Zernicki, www.zylia.co
(Headphones Required to experience the Best of 3D Audio
)

TOPIC: Zylia 6-Degrees of Freedom (DoF), Volumetric Audio production for the Metaverse and Virtual Concerts.

Our ZOOM meeting Saturday will require participants to have available headphones to listen to binaural audio recorded with a Zylia, multi-capsule microphone. This should be an exciting and educational meeting due to the advancing field of technology involved in multi-capsule recording technology, and the role it will play in our future recording menus. The ZYLIA ZM-1S microphone has a 19-capsule array. All are equipped with XENSIV™ digital MEMS microphones from the German-based Infineon Technologies. Each capsule has a 69 dB signal-to-noise ratio, 105 dB dynamic range, high output linearity, and handles up to 130 dB Sound Pressure Level.

The Zylia ZM-15, according to its promoters, delivers 6-Degrees of Freedom and delivers ‘Navigable Audio’. Unlike the current two microphone approach, the Zylia engineer records an entire sound field around and within any performance. This means for the listener while listening to a recording made with the Zylia, he/she will experience the same 6-DoF available at a live concert. The listener can walk through the recorded audio space freely as if he/she was at the live concert. For instance, you can approach the stage, or even step on the stage to stand next to the musicians. As in the case of a real-life sound scene the sound you hear will be different at every listening position, as in the case of a real-life sound scene.

Tomasz Zernicki’s presentation will explore:
1. How can the Metaverse and XR offer a vast playground and revenue source for the music industry?
2. How do I get started in XR if I'm an independent music-maker or label?
3. What are the leading platforms and tools to develop volumetric audio?
4. The strategy for recording sound and enabling six-degrees-of-freedom playback, using multiple simultaneous and synchronized Higher Order Ambisonics (HOA) recordings.

Many BAS members are involved in creating live concert recordings. Saturday’s presentation will be our first look into the possible future of live concert recordings.

Webmasters' note: to attempt to quantify and understand some of the above specs, have a look HERE

Join the Zoom Meeting !

Ken Schwarz is inviting you to a scheduled Zoom meeting.

Time: Saturday, September 3, 2022, 2PM Eastern Time, (SUGGEST 1:45 PM ) 

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

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: you click on the link in the Zoom instructions below and will be guided to download the Zoom software, HERE:
https://zoom.us/download

THE BAS MESSAGE
August 2022

1. Our recent in-person meeting with Leo Ayzenshtat of Orchard Audio had many graphs of his products' performance. One caught my eye, labeled THD versus Level. It showed the characteristic apparent rising distortion at low levels of a THD + Noise plot. The definition of THD is a sum of specified number of harmonics and does not include noise. Unless there is crossover distortion the plot will show diminishing distortion as the level is dropped, until the harmonics fall into the noise. A narrow band analyzer can be used to chase the harmonics below the noise.

I contacted Audio Precision, the maker of the hardware/software he's using, and got an opaque and evasive reply. Not satisfactory for a company of their reputation.

2. The new issue, V43N1, of the BAS Speaker will be published shortly. It features AXPONA and CES reports and is the first issue under my editorship. I hope you enjoy it.


email me here


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   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 8/30/22