Audio Technologies<br />The phonograph (sound writer), record player, or gramophone (letter + sound) is a device introduced in 1877 that continued common use until the 1980s for reproducing (playing) sound recording, although when first developed, the phonograph was used to both record and reproduce sounds.<br />The phonograph was invented in 1877 by Thomas Alva Edison at his laboratory in Menlo Park, New Jersey, USA.On February 19, 1878<br />
Audio Recordings- In 1982, New England Digital offered an optional hard disk recorder package for their Synclavier which allowed digital recording of monophonic 16-bit 50 kHz audio direct to a hard drive.<br />
It can be classified into two common types :<br />Magnetic Tape Recorder<br />Disc Recorder<br />Comes in various sizes and spin at various speed<br />Maybe in reel-to-reel and cassette disc type<br />
Cassette Audiotapes<br />Cassette Tape – tape length usually is measured in minutes of total playing time. The most varieties are C46 (23 minutes per side), C60 (30 minutes per side), C90 and C120<br />Magnetic Tape – is an external storage device that can be used for making copies of audio, video and data.<br />
Compact Disc (CD) – is an opticaldisc used to store digital data. It was originally developed to store and playback sound recordings exclusively, but later expanded to encompasses data storage (CD-ROM), write-once audio and data storage (CD-R), rewritable media (CD-RW), video compact disc (VCD), super video compact disc (SVCD), photo CD, picture CD, CD-i and enhanced CD.<br />
Integration of Technology in Audio Recordings. It can be used in:<br /><ul><li>In learning resources centre
Talking books for the blind or visually impaired students
Recording instructions in teaching tech-vocational competencies in automotive, handicraft, metal works etc.
Providing instruction on how to listen to lectures, speeches, poetry and other oral presentation.</li></li></ul><li>Non – Projected Visuals<br /><ul><li>These visual supporters are not very technological but are the very basic stuff that has been used in classroom for years.
They include real objects, models, exhibits, printed material, still picture, paintings, charts, posters, cartoons, graphic materials.</li></li></ul><li>Real Objects<br /><ul><li>Solid, physical objects that can be brought into a classroom to be examined.</li></ul>Butterflies<br />Fish<br />Rock<br />
Models<br /><ul><li> a 3-dimensional object that can not be brought into class, they are a smaller or larger version of the object.</li></ul>Globes<br />Heart Models<br />Solar System Simulators<br />
Exhibits<br /><ul><li>Dioramas or class room displays</li></ul>Dinosaur Station<br />Artifact Collection<br />Shoe Box Diorama<br />
Printed Materials<br /><ul><li>Can be teacher, student, or commercially made.</li></ul>Maps<br />Books<br />Puzzle<br />Bulletin Board<br />Poster<br />
Projected Visual<br /><ul><li>are defined as media formats in which still pictures are enlarged and displayed on a screen.
Projected visuals are suitable for all use at all grade levels and for instruction in all curriculum areas.</li></li></ul><li>Document Cameras<br />The document camera is a video camera mounted on a copy stand, pointed downward at documents, flat pictures, or graphics and small objects (like coins). The image may be projected onto a large screen within the room or it may be transmitted to distant sites via television.<br />
Overhead Projection<br /><ul><li>The overhead projector is most widely used audio visual device in classroom, business and other corporate firms.</li></li></ul><li>Two Types of Overhead Projector:<br />Reflective Type – the light from the lamp is reflected off the mirror like stage. This type is easy to carry since it is lighter and more compact.<br />Transmissive Type – light passes through the transparency<br />
Filmstrip<br />A filmstrip is a spooled roll of 35 mm positive film with approximately thirty to fifty images arranged in sequential order. Like 16 mm film, a filmstrip was inserted vertically down in front of the projector aperture, rather than horizontally as in a slide projector.<br />
Slide<br /><ul><li>The term slides refers to a small-format photographic transparency individually mounted for one at a time projection.</li></li></ul><li>Thank You……. <br />