MIDI:
Musical Instrument Digitisation Interface or MIDI provides a protocol or a set of rules, using which the details of a musical note from an instrument is communicated to the computer. But MIDI data is not digitized sound. It is directly recorded into the computer from musical instruments, whereas digitised audio is created from the analog sound. The quality of MIDI data depends upon the quality of musical instrument and the sound system. A MIDI file is basically a list command to produce the sound. For example, pressing of a guitar key can be represented as a computer command. When the MIDI device processes this command, the result will be the sound from the guitar. MIDI files occupy lesser space as compared to the digitised audio and they are editable also.
MAIN KEY CONCEPT:
1. MIDI (pronounced "mid-e") is a technology that makes creating, playing, or just learning about music easier and more rewarding.
2. Playing a musical instrument can provide a lifetime of enjoyment and friendship. Whether your goal is to play in a band, or you just want to perform privately in your home, or you want to develop your skills as a music composer or arranger, MIDI can help.
3. There are many different kinds of devices that use MIDI, from cell phones to music keyboards to personal computers. The one thing all MIDI devices have in common is that they speak the "language" of MIDI. This language describes the process of playing music in much the same manner as sheet music: there are MIDI Messages that describe what notes are to be played and for how long, as well as the tempo, which instruments are to be played, and at what relative volumes.
4. Because MIDI data is only performance instructions and not a digital version of a sound recording, it is actually possible to change the performance, whether that means changing just one note played incorrectly, or changing all of them to perform the song in an entirely new key or at a different tempo, or on different instruments.
5. MIDI data can be transmitted electronically between MIDI-compatible musical instruments, or stored in a Standard MIDI File for later playback. In either case, the resulting performance will depend on how the receiving device interprets the performance instructions, just as it would in the case of a human performer reading sheet music. The ability to fix, change, add, remove, speed up or slow down any part of a musical performance is exactly why MIDI is so valuable for creating, playing and learning about music.
Three Kinds of MIDI
• The original Musical Instrument Digital Interface (MIDI) specification defined a physical connector and message format for connecting devices and controlling them in "real time".
• The MIDI Messages specification (or "MIDI Protocol") is probably the most important part of MIDI. Though originally intended just for use with the MIDI DIN transport (see Part 2) as a means to connect two keyboards, MIDI messages are now used inside computers and cell phones to generate music, and transported over any number of professional and consumer interfaces (USB, FireWire, etc.) to a wide variety of MIDI-equipped devices. There are different message groups for different applications, only some of which are we able to explain here.
• There are also many different Cables Connectors that are used to transport MIDI data between devices. The "MIDI DIN" transport causes a lot of confusion because it has specific characteristics which some people associate as characteristics of "MIDI" -- forgetting that the MIDI-DIN characteristics go away when using MIDI over other transports (and inside a computer). With computers a High Speed Serial, USB or FireWire connection is more common. Each transport has its own performance characteristics which might make some difference in specific applications, but in general the transport is the least important part of MIDI, as long as it allows you to connect all the devices you want use!
• The final part of MIDI are the Standard MIDI Files (and variants), which are used to distribute music playable on MIDI players of both the hardware and software variety. All popular computer platforms can play MIDI files (*.mid) and there are thousands of web sites offering files for sale or even for free. Anyone can make a MIDI file using commercial (or free) software that is readily available, and many people do, with a wide variety of results. Whether or not you like a specific MIDI file can depend on how well it was created, and how accurately your synthesizer plays the file... not all synthesizers are the same, and unless yours is similar to that of the file composer, what you hear may not be at all what he or she intended.
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Tweaking AND Morphing Operation:
Morphing, a shortened form of metamorphosis is a transformation of an object
from one form to another. Morphing methods can be applied to any motion or transition
involving a change in shape and thus they yield evolving shapes. Here, we use linear
interpolation for generating the in-betweens. In order to use linear interpolation, object
shapes are described by polygons. Given two key-frames for an object transformation, we
first adjust the object specification in one of the frames so that the number of polygon
edges (or the number of vertices) in two frames is the sameTweaking
Tweaking is an operation by which
the existing vertices, edges or faces of an
object can be moved. We can use geometric
transformation functions as tweaking
operators, which do not affect the number of
vertices, edges or faces. Figure 9 illustrates
the tweaking operations that move a vertex,
an edge and a face of a polyhedron. In this
example, Fig. 9(a) is the first key-frame and
the other three Figs. 9(b)-(c) can be
considered as the second key-frames so that
we can generate the in-betweens using the
first key-frame and any one of the three
second key frames for animation.Tweaking refers to fine-tuning or adjusting a complex system, usually an electronic device. Tweaks are any small modifications intended to improve a system. Also otherwise known as "Garage Boy", one who spends all spare time in or around his or her garage.
In electronics, it is a synonym for "trimming." Analog circuit boards often have small potentiometers or other components on them that are used to calibrate or adjust the board as a service procedure: the small insulated screwdriver used to turn them is often called a "tweaker."
This use was echoed in the name of the product Tweek, a popular but controversial audio product during the 1980s, which was claimed to improve the electrical characteristics of audio switch contacts.
Hardware tweaking is a process of modifying certain parts of a hardware such as changing the cables, cleaning the heads of a VHS player with a branded cleaning fluid, oiling the moving parts of an engine with the best possible oil, etc.
Software tweaking is the process of improving the performance of an application or the quality of its output. There can be two ways of accomplishing this: manually (that is, if one is familiar with programming; though it may be irrelevant if the source of the application is closed, and there are no built-in means to adjust its performance) or using another piece of software specialized for that purpose (such as TweakXPand SysTool, semi-automatic tweaking utilities used to improve the performance of Microsoft Windows XP. Tweaking of this kind generally increases usability, in terms of personal configuration preferences, rather than objective performance of the system overall). Linux and other open source products are designed to facilitate the tweaking process as much as possible, as opposed to Microsoft Windows which limits tweaking but allows it with provision
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