Generalmusic GRP-800 Manuel d'utilisateur télécharger pdf (Page 22)

Page18

owner's manual

rp800

Page19

owner's manual

rp800

Physical Modeling

Physical Modeling is a method of sound synthesis based upon a mathematical model which de scribes the physical construction of the

instrument being simulated. Unlike sampling technology, in which an existing sound is simply recorded at a particular moment in time,

(to remain essentially the same for ev er), the sounds produced by a Physical Model continuously react and respond to the player’s input,

maintaining all the little nuances and im per fec tions which provide the most reliable subconscious as sur ance that the in stru ment being

played is the real thing. A sampled sound can be likened to a “snapshot” of a particular mo ment in time during which an instrument is

being played. It’s like taking a photograph. The goal of Phys i cal Mod el ing is this: Instead of simply recording the final audible product

of a in stru ment like an electric piano, we replicate all the elements which are incorporated into its con struc tion. If the physical

model is constructed carefully and accurately with meticulous attention to detail, the re sult ing sound should be ex act ly like the real thing

and, more importantly, the experience of playing and interacting with the in stru ment should be similarly convincing. In the Rp 800, all

the acoustic piano sounds are created by combining sample playback with Generalmusic’s Natural String Resonance, Damper Phys i cal

Model, Ad vanced Re lease and FADE tech nol o gies, (described below). Other instruments such as RHODES, WURLI and CLAVINET are

created using pure Physical Modeling.

TECHNOLOGY

The Rp 800 is powered by Generalmusic’s break-through technology DRAKE. DRAKE (Dsp-Risc-Advanced-Keyboard-Engine)

is the ultimate DSP: probably the most advanced piece of musical hardware in the world. Its 32-bit and 50-MIPS internal

structure and its totally programmable software architecture make this processor so fast and powerful that any kind of algorithm,

from Wavetable to Physical Modeling, can be implemented in real time, either in generation or in post-processing. Using the

Physical Modelling power offered by DRAKE, Generalmusic has created and patented a number of new algorithms which

replicate some of the world’s most famous vintage instruments like Rhodes™, Wurlitzer™ and Clavinet™. DRAKE has found

unanimous, enthusiastic appraisal from experts in these fields.

FADE - Filter Algorithm Dynamic Emulation

Reproduction of the complex harmonic and dynamic changes which take place as you increase or de crease the velocity of a key-strike on

a piano have always presented a serious problem for traditional sam ple-playback tech nol o gy. The only practical way to re pli ca te these

changes has been to select three or four distinctly dif fer ent levels and switch between these according to the velocity with which the key

is struck. This produces the unnatural effect of having clearly audible steps between different velocity levels, further diminishing the

authenticity of the sound reproduction. Unlike the velocity-switching meth ods used in other elec tron ic pianos, Generalmusic’s unique

FADE technology utilizes only one specially configured sound source per note. At the heart of the FADE engine is a extensive database

which can be used to look up the precise harmonic content of any note played at any velocity level. Whenever a note is played, the FADE

engine analyzes the velocity of the key-strike and constructs, in real-time, a model of the nec es sary har mon ic con tent for that particular

note played at that velocity. The note’s sound source is pro cessed by the FADE engine with appropriate harmonic content being added

or subtracted ac cord ing ly. In practice, FADE tech nol o gy provides seamless transition from pianissimo all the way through to for tis si mo for

each note without any audible switching.

Advanced Release Technology

The particular sound of a piano string being stopped by a damper while in motion is replicated by Generalmusic’s unique Ad vanced Re-

lease Technology. Sample based electronic pi anos traditionally use a en ve lope generator to control what happens when a key is released.

This simply allows the sample loop to continue playing for a set period of time until its amplitude is finally reduced to zero by the envelope

generator. In an acoustic piano, vibrating strings are silenced when a felt damper comes into contact with the moving string. When this

happens, depending on how hard the key was struck and the length of the string itself, certain frequencies are damped earlier than oth-

ers while some other frequencies are even accentuated, (anyone who ever studied how to produce harmonics on a guitar will recognize

this principle). This produces a distinctive harmonic “ring” as the different fre quen cies in the string’s tone dis si pa te through out the piano

soundboard. This Advanced Release Tech nol o gy in the Rp700 series simulates these phe nom e na with complete accuracy throughout the

88 note range.

Damper Physical Model

Another technology patented by Generalmusic is Damper Physical Model. Whenever the damper pedal is depressed, the damper physi-

cal model simulates the effect of sym pa thet ic resonance being produced by the strings which the action of the pedal has now left free to

res o nate. Use the damper pedal to hear the effect of the Damper Phys i cal Model by comparing the sounds of notes played in the highest

octave of the in stru ment with and with out the damper pedal de pressed.

Natural String Resonance

This physical modeling technology, patented by Generalmusic as Natural String Resonance, allows all of the complex harmonics normally

produced by a piano’s soundboard to be faithfully re pro duced. This means that a note’s individual sound will always be slightly different

depending upon which other notes are currently being held, (and consequently which strings are un-damped and free to resonate in sym pa thy

with the note played). If you hold down a low C and let the note decay, the strings for that note are still un-damped for as long as the key

remains depressed. If you now strike another C higher up the keyboard, (stac ca to), you will hear the sympathetic resonance of the low C

strings in response to the new note played. This natural effect replicates exactly what hap pens inside a grand piano. If you experiment with

different combinations of notes you will hear harmonic colors particular to each. Because this effect is produced by physical modeling and

not by samples or DSP effects, the result is a musically and technically ac cu ra te simulation of a piano’s soundboard and virtually infinite

combinations of har mon ics can be produced.

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Generalmusic GRP-800 Manuel d'utilisateur Page 22

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