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Chapter 15 Recording and Editing Sound Getting Started In this Chapter, you will learn: How sound capability enhances your PC How your PC records, stores, and plays digital sound How speech synthesis works What you should know about MIDI What is ripping About Hardware: Sound devices

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Chapter 15 Recording and Editing Sound

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Chapter 15 recording and editing sound l.jpg

Chapter 15Recording and Editing Sound


Getting started l.jpg

Getting Started

  • In this Chapter, you will learn:

    • How sound capability enhances your PC

    • How your PC records, stores, and plays digital sound

    • How speech synthesis works

    • What you should know about MIDI

    • What is ripping

    • About Hardware: Sound devices

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How does sound capability enhance by PC

  • Sound adds a new dimension to your PC

    • Beeps and sounds provide feedback as you use your PC

    • Music lovers can listen to sample tracks

    • Children can listen to stories

    • Visually impaired individuals can have the screen contents read to them

  • Computers work with two general categories of sound

    • Digitized sound is a recording of real sound converted into electronic signals

    • Synthesized sound has not been recorded from a live source, but instead has been generated by a machine

  • Each sound category has unique characteristics and applications

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How does my PC record, store, and play digital sound?

  • To digitally capture sound, you need a microphone and sound software

  • A sound wave provides information about a sound

    • Height of wave indicates volume, called amplitude

    • Time between wave peaks indicates the sound’s frequency

  • To digitally store a sound wave, your PC periodically records a sample of the wave’s amplitude as a binary number

    • Sampling rates are measured in kHz (kilohertz), where 1 kHz is 1,000 samples per second

    • For human voice, 11 kHz works fairly well. For music, 22 kHz to 44 kHz is required

    • Digital sound files that have not been compressed are big

    • WAV is a popular uncompressed audio file format

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How does speech synthesis work?

  • Machines produce sound that resembles the spoken word through speech synthesis

    • Most speech synthesizers string together basic sounds called phonemes

  • Speech synthesizer typically includes text-to-speech software and synthesizing hardware

    • Text-to-speech software examines the text on a PC and breaks it down into a series of sounds that can be output

    • Synthesizing software consists of electronic circuitry that can generate speech or musical sounds

  • Unlike digitized speech, synthesized speech can theoretically produce any words or phrases

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What should I know about MIDI?

  • MIDI (musical instrumental digital interface) specifies a standard way to store music data

    • MIDI files contain instructions, called MIDI messages, for synthesizing music based on pitch, volume, and duration of each note made by each instrument

    • MIDI is suitable for instrumental music, but not for vocals

    • MIDI’s advantage lies in its ability to store lengthy musical sequences in a small file

  • Use sequencer software to capture the musical themes from a MIDI instrument or enter the notes on a musical staff

  • Edit your composition by assigning notes to instruments, adding harmony, and inserting percussion

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What should I know about MIDI?

Composing MIDI Music

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What is ripping?

  • Ripping is slang for importing tracks from a CD or DVD to your computer’s hard disk

    • Technical term for ripping is digital audio extraction

    • Ripping is handy when moving files between PCs and devices

  • Music file formats

    • CD-DA (Compact Disc Digital Audio) format for music on CDs

    • Music from CDs is usually compressed into: MP3, AAC (Advanced Audio Coding), and WMA (Windows Media Audio)

  • Many software tools for ripping CD tracks are available

  • In the U.S., ripping music for personal use is controversial since it is done without the artist’s permission

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What is ripping?

Ripping music to a CD using iTunes software

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Hardware: Sound devices

  • Most PCs today include a basic audio system with a sound card, speakers, and possibly a microphone

  • A sound card is a circuit board that typically plugs into an expansion slot on your PC

    • Provides connectors for a microphone, speakers or headphones

    • Provides a joystick port that doubles as a port for MIDI instruments

  • Basic sound card is adequate for playing games, business software, and Web browsing

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Hardware: Sound devices

The sound card is the basic building block of your PC’s audio system

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Hardware: Sound devices

  • Digitized sound

    • Sound card reproduces the digital samples in the sound file

    • Sound quality depends on several factors, the most basic being frequency response. Frequency response is the range of notes it can produce

  • MIDI music

    • Sound card receives messages from a MIDI file

    • Wavetable synthesis generates music by patching together a set of sounds (patch set) prerecorded as individual notes from actual instruments

    • 256-voice wavetable produces better quality sound than a 64-voice wavetable

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Hardware: Sound devices

  • Sound card outputs sound to speakers or headphones

    • New technologies include surround sound, 3-D sound, and environmental sound

  • Speakers

    • Speakers cannot improve sound quality, but cheap speakers can degrade it

    • Your speaker quality level should match the quality level of your sound card

    • Most speaker systems include two speaker units

    • Higher end systems may also include a subwoofer to produce enhanced bass sound

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Hardware: Sound devices

  • Microphones

    • Sound card receives input from a microphone or MIDI device

    • For better sound quality choose a good-quality “mic”

  • Portable audio player

    • Pocket-sized, battery-powered device that stores digital music

    • Transfer music from your PC or buy songs online

    • Connect to headphones or stereo system

    • Supports a variety of compressed audio formats

    • Some can also play videos and e-books

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Can I copy it?

  • What do you think?

    • When you purchase a music CD, do you believe that you have the right to convert it into any format (such as cassette tape or MP3) for your own use?

    • Do you think the Digital Millennium Copyright Act should be revised to allow people to circumvent DRM for music that has been purchased legitimately?

    • Have you ever been prevented from copying music by some type of DRM technology?

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Chapter Summary

  • You should now :

    • Know how sound capability enhances your PC

    • Know how your PC records, stores, and plays digital sound

    • Understand how speech synthesis works

    • Know about MIDI

    • Understand ripping

    • Understand sound devices

Practical PC 5th Edition Chapter 15


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