Glencoe Introduction to Multimedia Chapter 8 Audio 1 Section 8.1 Audio in Multimedia Audio plays many roles in multimedia. Effective use in multimedia requires an understanding of audio file formats, sound quality, and file sizes.

Glencoe Introduction to Multimedia Chapter 8 Audio 2 Audio in Multimedia Using audio in multimedia can help capture and hold your audience’s interest and may be incorporated into a range of multimedia projects. Some forms of audio in multimedia projects include: MusicSound Effects Voice-over Alerts Prompts

Glencoe Introduction to Multimedia Chapter 8 Audio 3 Locating Audio Files Online You can use search engines to locate audio files for your multimedia project. Most music cannot legally be used without paying a fee to the publishing company. Stock Sound SitesOnline Music Stores Often royalty-free. Obtain permission. Follow terms and conditions of use. Purchase music and audio files. Download, play, and share online.

Glencoe Introduction to Multimedia Chapter 8 Audio 4 The Role of Audio in Multimedia Use the checklist below to help you analyze the use of audio in your multimedia project. Audio should have a specific role in your project. Additionally, keep in mind accessibility guidelines.

Glencoe Introduction to Multimedia Chapter 8 Audio 5 Accessibility Issues When using audio, you must also think about accessibility issues. When using sound, alternate text must be provided to describe the audio to people with hearing impairments. This can be provided as a transcript that includes the audio’s content word for word, with descriptions of sounds. When the transcript is timed to appear with the visual presentation, it is called captioning.

Glencoe Introduction to Multimedia Chapter 8 Audio 6 Audio in Multimedia An audio file’s format determines which devices can interpret, open, and properly play the file’s content; how much space it takes up on a disk; and how long it takes to travel the Internet.

Glencoe Introduction to Multimedia Chapter 8 Audio 7 Audio in Multimedia How can audio in a multimedia project be made accessible to someone who has difficulty hearing? Audio in a multimedia project can be made accessible to someone who has difficulty hearing by including a transcript or by captioning.

Glencoe Introduction to Multimedia Chapter 8 Audio 8 Using Audio Technology Sound Quality How well a multimedia application delivers sound depends partly on how the sound was recorded and edited. Digital recordings are the most durable and accurate. Sampling and sampling rates determine sound quality. Higher resolution of the sample size ensures better sound quality.

Glencoe Introduction to Multimedia Chapter 8 Audio 9 File Size The size of an audio file depends on the number of channels, sample size, sampling rate, and length. File compression reduces the size of audio files for transmission. Lossy compression discards some important data and reduces sound quality. Lossless compression maintains quality but generates larger file sizes. Streaming is another option for reducing wait time.

Glencoe Introduction to Multimedia Chapter 8 Audio 10 Using Audio Technology What are sampling, sampling rate, and sample size? Sampling is the recording of fragments of a sound wave, sampling rate is the number of times per second a recording device samples sound waves, and sample size is the number of bits of data in each sample.

Glencoe Introduction to Multimedia Chapter 8 Audio 11 Section 8.2 Work with Audio Audio editing software is used to create and modify sound for multimedia. Effective audio should support a multimedia project’s content.

Glencoe Introduction to Multimedia Chapter 8 Audio 12 Editing Audio Audio editing software lets you create audio or change the way audio files sound to best suit its purpose in a particular multimedia project. These programs have the following features: Tools for recording, editing, or applying effects to sounds. Tools for importing, exporting, or converting audio from one format to another. Tools for combining or mixing two audio files. Tools for analyzing rhythm and pitch.

Glencoe Introduction to Multimedia Chapter 8 Audio 13 Editing Audio Recorded and edited sound effects can be useful to achieve a desired effect in a multimedia project. You can offer feedback to a user of a slideshow quiz. You can simulate common or ambient sounds to lend to the environment of a game or simulation. Remember, sound effects should reflect and support the content of the multimedia project.

Glencoe Introduction to Multimedia Chapter 8 Audio 14 Editing Audio Identify the audio editing technique for blending different tracks to produce a combined recording. The audio editing technique for blending different tracks to produce a combined recording in to mix.

Glencoe Introduction to Multimedia Chapter 8 Audio 15 Audio Editing Software While most new computers come with some software and hardware for editing audio, it does not provide the sophisticated features of commercial and professional audio applications. Technologies such as speech synthesis and voice recognition make some multimedia elements more accessible to people with impaired hearing, speech, or mobility.

Glencoe Introduction to Multimedia Chapter 8 Audio 16 Audio Editing Software ProgramDetailsPlatform Adobe AuditionProfessionalWindows PC Adobe SoundboothHome userWindows/Mac OS AudacityOpen- source, free Windows, Mac, Linux Cakewalk SONAR V-Studio ProfessionalStudio GoldWaveProfessionalWindows OS LogicProRecord; mixMac Sony Sound ForgeProfessionalWindows PC Sound RecorderRecordWindows

Glencoe Introduction to Multimedia Chapter 8 Audio 17 Audio Editing Software Identify three popular audio editing programs. Three popular audio editing programs are Adobe Audition, Audacity, and GoldWave.

Glencoe Introduction to Multimedia Chapter 8 Audio 18 Audio Hardware The following input and output devices create, process, and produce audio for multimedia productions. Audio Card Microphones Speakers MIDI Hardware CD/DVD Burners DeviceFunction Sends sound to speakers Allow you to hear audio Records audio Creates and saves MIDI input Records audio output

Glencoe Introduction to Multimedia Chapter 8 Audio 19 Audio Hardware Name four pieces of audio hardware. Four pieces of audio hardware are audio cards, speakers, microphones and MIDI hardware.

Glencoe Introduction to Multimedia Chapter 8 Audio 20 Chapter Summary Using audio effectively can help you enhance your multimedia project. Audio can include music, sound effects, alerts and prompts, or voice-overs. Audio is often used to convey meaning, set a mood, prompt action, add interest or attention to an important event, add a sense of realism, facilitate understanding, clarify visual information, complement action, or tell a story. Audio should not distract your viewers.

Glencoe Introduction to Multimedia Chapter 8 Audio 21 Chapter Summary You can use the Internet to locate audio files. Be sure you have permission to use audio. Audio comes in a variety of formats. Sound quality depends on sampling rates, the number of channels used, and file size. Audio editing software lets you record, edit or apply effects to sounds; import, export, or convert audio from one format to another; combine or mix two audio files; or analyze pitch and rhythm.