Identifier6412608
Created AtSun May 28 2006 19:01:26 GMT+0000 (Coordinated Universal Time)
Media TypeSHN
Media Count24
Show RatingA++
Sound RatingA
Note
* first performance

The original reels of the Port Chester run of '71 were audibly
tainted due to a cable problem. The result is a tone which hovers
around 8000 Hz with an amplitude of about +20 dB above the noise
floor. This translate to a very annoying pitch, especially during quiet
sections, which is in the old-tv-tube or lousy-hard-disk or maybe even
the-sound-you-hear-after-you-slam-your-head-against-a-concrete-wall
class of 'whine'. Because this interference is 'monochromatic' it's
easy to get rid of if you have the processing power and a quick
FFT algorithm. I used the filter-shaping capabilities of the Sonic
Foundry Noise Reduction Plugin to tailor a very narrow notch filter
which attenuated the interference without affecting the rest of the
signal. And it's all done in the digital domain. Huzzah!

As a side note, I actually ended up crafting many filters to process
these shows. The frequency of the interference actually drifted anywhere
from 7700 to 8100 Hz during a given show. This was probalby due to a
slightly wandering reel speed. It made my work harder but when I tried
a much wider filter I started to be able to hear the attenuation in the
music. The filters generally go like this:

25 dB /- - - - - - - -\
/ \
/ \
0 dB | |
7830 7900 7970

The end result is no more annoying whine!

I also removed some of the nasty mic feedback in the 2/18/71 Bertha
using this type of filter.

Leigh Orf <orf@mailbag.com>
Source InfoSBD -> Dolby A Reel -> Dolby A decode -> DAT -> Sound Forge NR -> CD-R
Tech NoteThe Sound Forge noise reduction was used to attenuate a very narrow frequency band (in the vicinity of 8000 Hz) which was present as interference on the original reels. See my notes below for details.
Trades Allowed
Source
SHNIDDateVenueCityStateArchive Identifier
1071971-02-18Capitol TheaterPort ChesterNY
SBD -> Dolby A Reel -> Dolby A decode -> DAT -> Sound Forge NR?-> CD-R; via Orf; disortion removed digitally (see notes); more info comparing Orf's NR to the WBOTB version; note the (possibly reextracted?) Orf version went to abgd 12/99 via D. Hollister, J. Sachs (md5s shown as "abgd", kindly provided by Eric Noon: note 2 versions- abgda, posted to abgd 1/19/00, has d2t2 sig different from Eric's abgdb, which he generated himself for the set- not sure which is correct)
Performance
Grateful Dead 1971-02-18 Capitol Theater, Port Chester, NY
Set 1Bertha *
Truckin'
It Hurts Me Too
Loser *
Greatest Story Ever Told > *
Johnny B. Goode
Mama Tried
Hard To Handle
Dark Star >
Wharf Rat > *
Dark Star >
Me And My Uncle
Set 2Casey Jones
Playing In The Band *
Me And Bobby McGee
Candyman
Big Boss Man
Sugar Magnolia
Saint Stephen >
Not Fade Away >
Goin' Down The Road Feeling Bad >
Not Fade Away >
Uncle John's Band
Set 3

CommentMickey's last show until 1974-10-02
E.S.P. show
New Riders Of The Purple Sage opened.
Ned Lagin sits in on keyboards most of the show.
First time performed *

Jerry Garcia - Guitar
Bob Weir - Guitar
Ron "Pigpen" McKernan - Hammond B3, Harmonica
Phil Lesh - Bass
Bill Kreutzmann - Drums
Mickey Hart - Drums