Page 47 - DCAP303_MULTIMEDIA_SYSTEMS

Unit 3: Sound

6. ……….. is the most popular format for downloading and storing music. notes
( a) .wav (b) gsm
( c) amr (d) mp3

7. The MPEG Layer-3 (mp3) format is good for voice storage.
(a) True (b) False

8. ADPCM stands for ………………………………….
( a) Adaptive Differential Pulse Code Modulation
( b) Automated Differential Pulse Code Modulation
( c) Adaptive Dialogic Pulse Code Modulation

( d) None of these
9. The ………. file contains no audio data itself.
( a) .ra (b) .aac

( c) .ram (d) None of these
10. Voice-messaging minicomputer and mainframe audio response units use .........................
software to verbally guide an operator.
( a) voice-response (b) audio response
( c) audio player (d) None of these

3.9 summary

• Sound is produced when waves of varying pressure travel though a medium, usually air.

• The MIDI keyboard is useful to simplify the creation of musical scores.
• Traditional microphones capture sound in what is called analogue form in waves.
• Music is useful way to add mood and meaning to your story.
• Voice recognition systems analyze and classify speech or vocal tract patterns and convert
them into digital codes for entry into a computer system.

3.10 Keywords

Codec: The way in which the audio is compressed and stored is called the codec, which determines
how small the file size is. Some file types always use a particular codec.
Digitizing: Digital audio is created when a sound wave is converted into numbers.

equalization: It offers digital equalization capabilities that allow you to modify recording
frequency content so that it sounds brighter or darker.
Musical instrument Digital interface (MiDi): It is a communication standard developed for
electronic musical instruments and computers.
trimming: It removes dead air or blank space from the front of a recording and an unnecessary
extra time off the end is your first sound editing task.

LoveLy professionaL University 41