| Identifier | 6412608 |
| Created At | Sun May 28 2006 19:01:26 GMT+0000 (Coordinated Universal Time) |
| Media Type | SHN |
| Media Count | 24 |
| Show Rating | A++ |
| Sound Rating | A |
| 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 Info | SBD -> Dolby A Reel -> Dolby A decode -> DAT -> Sound Forge NR -> CD-R |
| Tech Note | The 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
| SHNID | Date | Venue | City | State | Archive Identifier |
|---|---|---|---|---|---|
| 107 | 1971-02-18 | Capitol Theater | Port Chester | NY | |
| 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 1 | Bertha * 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 2 | Casey 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 | |
| Comment | Mickey'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 |