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DraculVaDomni

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    Under The Hood - Gibson Robot Guitar

    in Despre chitară

    Posted

    Gibson Guitar has been an aggressive technology adopter. On the heels of its Ethernet Out (digital) guitar, the company has released the Robot Guitar, which automatically tunes to a range of standard and alternative tunings at the touch of a button.

     

    uth.gifFor a full archive of articles and related On-Demand seminars, click here

     

    Gibson is the public face behind the Robot Guitar, but German company Tronical and guitarist and EE Chris Adams are the inventive forces. Tronical developed the automation as a guitar retrofit kit back in 2006, and Gibson licensed the technology to launch the original, limited-run Robot Guitar in December 2007. Other Gibson models are following that launch to market.

     

     

     

    Electromechanics join with embedded processing to produce an electric guitar that takes over the often laborious task of tuning and retuning. Aside from simplifying life for tin ears and those who would rather play than tune, the design is useful for players who require both standard and "open" tunings. By supporting quick transitions among tunings, the Robot eliminates the need for multiple instruments (one for each tuning) and the cost that goes with them.

     

     

     

    At the core is a standard Gibson Les Paul electric guitar. The departures from a stock guitar begin with a special bridge and tailpiece. The bridge provides one of the two endpoints that set the string length; the other string endpoint is the "nut" at the end of the fret board. The bridge has the usual individually adjustable "saddles" for each string, which adjust the intonation of the guitar. Unlike a standard bridge, however, the saddle pieces (normally metal) are replaced with isolated piezoelectric pickups to detect the string frequency. Audio output comes from a separate pair of wound pickups no different from any other Les Paul guitar, thus maintaining traditional sound.

     

     

     

    The piezo pickups, which detect string frequency, feed signals for each of the six strings from the saddle, by way of a flex circuit, through the guitar body. The flex terminates at the body electronics module, mounted in the position normally occupied by the volume control knob. Although the body electronics knob still serves as a volume control, the action begins when the knob is popped out to go into "Robot mode."

     

    DC1524_UTH_PG_32.gif

    Click here for larger image Pulled out, the knob becomes a multiposition rotary switch that allows players to select the desired tuning. LEDs in the special control knob blink to indicate that retuning is complete, as well as to communicate other information.

     

     

     

    The body electronics thus provide not only the controlling user interface (by way of the knob) but also the brains of automated tuning. Using the six individual piezo signal inputs, the body electronics multiplex all string signals down to a single line that ties into a Silicon Labs C8051F120 MCU's 12-bit analog/ digital input. Using a crystal-derived reference frequency, the C8051F120 can tell whether each string is running flat, sharp or on pitch. The Silicon Labs part (originally from Cygnal Semiconductor, a late 2003 Silicon Labs acquisition) then controls retuning to get everything in line (more on that shortly).

     

     

     

    Outside the special switch/volume-pot assembly, MCU and analog multiplexing, other devices in the body electronics are mostly in place to serve power conversion needs. A 2.4-V NiCd battery pack must be rejiggered for local power needs and stepped up to produce the 12-V power rail needed up in the headstock for additional circuitry and motorized tuner pegs.

     

     

     

    To communicate with and power the headstock electronics, the Tronical solution takes another clever step toward retaining as standard a guitar as possible. A cable running through the guitar neck would, of course, work, but it would also be a major modification to the basic guitar design and nearly impossible to retrofit. Instead, the Robot guitar uses the guitar strings to provide six points of connection between body and headstock electronics.

     

     

     

    Each line is isolated behind the special tailpiece. The traditionally all-metal part instead has ceramic insulating ferrules in each string feedthrough and a bottom-side circuit board to allow each string to connect from the body to the head. A flex circuit out of the body electronics and to the tailpiece distribution board wires things up, and a thin circuit board sits underneath each tuner peg to pick off and deliver power and communication signals to the headstock electronics assembly. To add redundancy in case of a broken string, 12-V power and ground each appear to be delivered over two strings.

     

     

     

    Signal communication lets the headstock electronics know which way to tune each peg. Redundancy is again seen, with what appear to be duplicate data signals over two remaining strings. Packet data that must deliver tuning instructions for all the pegs is sent by what looks like a single-wire CAN bus implementation, indicated by the presence of an NXP AU5790 CAN transceiver at each end of the signal path.

     

     

     

    After tuning data is decoded and sorted out for each string in a second Silicon Labs C8051F120, the remaining headstock electronics are focused mostly on power conversion to get from the 12-V rail to tuning-peg motor voltages and local electronics supplies. As in the body electronics, most of the power management parts in the headstock electronics come from Linear Technology. The MCU directly controls a trio of dual-channel motor drivers (for the six strings) via Rohm's BA6845FS motor driver.

     

     

     

    The motorized tuning pegs contain a motor, reduction mechanism and peg worm gear. The tuning pegs can be pulled out for manual tuning or pushed in to allow the mechanized system to take over. To exert large forces from a small dc motor, the rpm are reduced by what I'd estimate to be a 500:1 ratio to go from the low-torque, high-rpm motor to the low-rpm, high-torque environment needed for string tensioning. Down-gearing comes from a mix of reduction cogs, a reduction pulley driven by a rubber belt (surprising!), and a concentric reduction axle, all of which hide in an oversized but still compact assembly that fits the existing tuning peg holes.

     

     

     

    As an EE and hack player, I have to give Gibson and Tronical credit for creating an instrument that advances the state of the guitar.

    100 De Chitaristi Si 100 De Note...se Baga Cineva?

    in Cafenea

    Posted

    Interesanta chestia respect.gif, dar trebuie sa se faca repeptitii, si tinand cont ca e vb. de 100 de chitaristi, pana alegem fiecare ce nota face, pana repetam, trece o gramada de timp, si live nuprea merge, fiindca 100% cineva va gresi...si de unde 100 de chitaristi?. Cum o sa repete 100 de chitaristi....cu alte cuvinte, greu de facut treaba asta, dar in orice caz e calumea chestia rulez.gif.

    Plek Guitar Set-up

    in Discutii despre echipament

    Posted

    Which guitarist doesn't know this scenario: the instrument sounds excellent, looks precious and sits well in the hand, but somehow it is hard to play. A problem, that can be rectified.

     

    plekpro_1.jpg

     

     

    Next to the tone it is the playability that is one of the most important characteristics of a musical instrument that determines its quality.With the plek process the most optimal string action possible for each instrument can be guarantied, matching the individual style of the musician. An optimal playable guitar sounds better: the strings do not hit against the frets while playing and intonation problems, that occur because of a inadequately high string action, are eliminated.

     

     

    Plek pro speeds up the production process and raises the quality of

    instruments to an extremely high and consistent level

    The plek pro has been developed to be used in guitar production factories and/or service-repair shops as a tool that not only does precise fret dressing but also helps with quality control and R&D. plek pro speeds up the production process and raises the quality of instruments to an extremely high and consistent level.This computer controlled device scans and dresses a guitar under actual playing conditions, strung and tuned to pitch. This is a major breakthrough since the plek pro identifies precisely what needs to be done for perfect fretwork, executes this rapidly, and delivers perfect results on the instrument when restrung.

     

    http://www.plek.com/en_US/home/

    Mosu'

    in Cafenea

    Posted · Edited by Chaos_AD

    Poi sa vedem....chitara acustica mi-a adus, electrica trebuie sa apara, si desigur VREAU SA O VAD PE DIANA blush.gif. Atat rolleyes.gif.

    Descoperiri muzicale

    in Cafenea

    Posted

    Ancientrespect.gif is a Norwegian melodic black metal formed in 1992. The band has released six full-length albums and is currently signed to Metal Blade Records. Ancient used to have a raw black metal sound, similar to Darkthrone's works. Beginning with The Cainian Chronicle, they moved towards a more Nordic/atmospheric black metal sound, akin to Emperor. After a period of turmoil concerning their line-up, they went on to add gothic-style instruments such as violins, female vocals, and synthesizers to their music.

     

    Wikipedia -> http://en.wikipedia.org/wiki/Ancient_(band)respect.gif

     

    Myspace -> http://www.myspace.com/ancientband respect.gif

     

    Si one hell of a song de la ei rulez.gif->

    respect.gif

    Descoperiri muzicale

    in Cafenea

    Posted

    Richie Kotzen Genre(s) Hard rock, Jazz fusion, Soul, Blues

     

     

    Discography

    (54 albums so far)

     

     

     

     

    Arthur's Museum

     

     

    Solo Albums

    • (1989) Richie Kotzen
    • (1990) Fever Dream
    • (1991) Electric Joy
    • (1994) Mother Head's Family Reunion
    • (1995) The Inner Galactic Fusion Experience
    • (1996) Wave of Emotion
    • (1996) Times Gonna Tell (EP)
    • (1998) What Is
    • (1999) Bi-polar Blues
    • (1999) Break It All Down
    • (2000) Something to Say
    • (2001) Slow
    • (2003) Acoustic Cuts
    • (2003) Change
    • (2004) Get Up
    • (2004) The Best of Richie Kotzen
    • (2006) Instrumental Collection: The Shrapnel Years
    • (2006) Ai Senshi ZxR (covers of songs from the Gundam series)
    • (2006) Into The Black
    • (2007) Return Of The Mother Head's Family Reunion (Japan & Europe)
    • (2007) Go Faster (US only)
    • (2008) Live In São Paulo

     

     

    With Greg Howe

     

     

    Former Bands

    Badfun Prodject

     

     

     

    Poison

     

     

    Mr. Big

    • (1999) Get Over It
    • (2000) Deep Cuts
    • (2001) Actual Size
    • (2002) In Japan
    • (2004) Influences & Connections - Vol. 1

     

     

    Vertú

    • (1999) Vertú (project with Stanley Clarke and Lenny White)

     

     

    Forty Deuce

    • (2005) Nothing to Lose

     

     

    Collaborations -

    • (1996) Sticky Wicked (with TM Stevens)
    • (1996) Ground Zero (with TM Stevens)
    • (1996) Only You (with TM Stevens)
    • (1999) Not So Innocent (with Jesse's Powertrip)
    • (2000) Mikazuki in Rock (with Mikazuki Tekkodan)
    • (2000) Submarine (with Gregg Bissonette)
    • (2003) All That I'd Be (with Steve Saluto)
    • (2004) Nowhere To Go (with Takayoshi Omura)
    • (2006) Rough Beat (with Steve Saluto)
    • (2006) Avalon (with Richie Zito)
    • (2006) Erotic Cakes (with Guthrie Govan)
    • (2007) Live For Tomorrow (with Marco Mendoza)

     

     

    Various artists albums -

    • (1991) Bill & Ted's Bogus Journey: Music from the Motion Picture
    • (1992) L.A. Blues Authority-"L.A. Blues Authority"
    • (1992) The Guitars That Rule The World - Vol. 1
    • (1994) L.A. Blues Authority Volume V: Cream Of The Crop
    • (1996) Crossfire - (A Tribute to Stevie Ray Vaughn)
    • (2000) Bat Head Soup: A Tribute to Ozzy
    • (2001) Stone Cold Queen: A Tribute to Queen
    • (2002) One Way Street: A Tribute To Aerosmith CD
    • (2002) An All Star Lineup Performing The Songs Of Pink Floyd
    • (2004) Spirit Lives On: The Music Of Jimi Hendrix Revisited Vol. 1
    • (2005) Numbers From The Beast - An All Stars Salute To Iron Maiden

     

     

    Videography

    • (1989) Rock Chops
    • (1993) <a href="http://en.wikipedia.org/wiki/7_Days_Live" title="7 Days Live" class="mw-redirect">7 Days Live (Live shot concert with Poison)(re-released 2006)
    • (1994) Mother Head's family Reunion (Videoclip from the Mother Head's family Reunion Album)
    • (1996) Wave of Emotion (Videoclip from the Wave of Emotion Album)
    • (1997) Something To Say (Videoclip from the Something To Say Album)
    • (2001) Don't Wanna Lie (Videoclip from the Slow Album)
    • (2001) Shine (Videoclip from Mr. Big's Actual Size Album)
    • (2002) Hi-Tech Rock Guitar
    • (2005) Live In South America
    • (2008) Bootlegged in Brazil

    Site --> http://www.richiekotzen.com/

     

    Wikipedia --> http://en.wikipedia.org/wiki/Richie_Kotzen

     

    Si o mel de la el/ei -->

    Descoperiri muzicale

    in Cafenea

    Posted

    Vlad Tepesrespect.gif was a French black metal band which was formed in Brest in 1992. The name originated from the 15th century Wallachian ruler, the inspiration for Bram Stoker's fictional vampire Dracula. The group belongs to The Black Legions. Worlok Drakksteim also has a side project named Black Murder. He is the composer of that band, while Wlad Drakksteim is the composer for Vlad Tepes. Vlad Tepes were one of the Black legions bands featured in the magazine The Black Plague - First Chapter (And Maybe Last One) in 1995.

     

    Demos

    • Rehearsal Winter '93 (1993)
    • Celtic Poetry (1994)
    • The Return of the Unweeping Moon (1994)
    • War Funeral March (1994, Tape, Full Moon Productions)
    • Brouillons I (1995)
    • Into Frosty Madness (1995)
    • Brouillons II (1995)
    • Dans Notre Chute (1996)
    • La Morte Lune (1997)
    • The Black Legions (1998)
    • Pantheon (2002, Very rare, little known about demo.)

     

     

    Splits

     

     

    Re-releases

    O mel de la ei --> http://www.youtube.com/watch?v=vmoZ3wtkxpQ

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