Audio Communications: Sound

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Audio Communications: Sound. Mr. Butler Communication Systems John Jay High School Wappingers Central School District UPDATED 11/2011. Why is it important to learn about sound?. Sound is becoming increasingly important when designing for new media and Internet. - PowerPoint PPT Presentation

Text of Audio Communications: Sound

  • Audio Communications: SoundMr. ButlerCommunication SystemsJohn Jay High SchoolWappingers Central School District

    UPDATED 11/2011

  • Why is it important to learn about sound?Sound is becoming increasingly important when designing for new media and Internet.You dont have to be a musician to be a sound designer, but familiarity with all types of audio is important.

  • Sound FrequencySound is composed of a complex set of waves. These waves vibrate at different frequencies. High frequencies are defined and controlled by the TREBLE knob on your amplifierLow frequencies are controlled by the BASS knob

  • Analog Audio TheoryWhat is Analog Audio?Analog means that the sound has been recorded on an analog medium, most likely tapeAnalog also means that each copy is NOT going to be equal to the original.

  • Digital Audio TheoryAdvantages of Digital Audio Each copy is EQUAL to the original, and there is no generation loss.This is why the music business moved to CDs.

  • Frequency RangeFor most professional applications, it is desirable to record the original sound in as high a quality as possible and then sample it down.

  • Frequency RangeThe normal range of human hearing is 20 to 20,000 Hertz, or cycles per second. Only very high quality sound systems and headphones are capable of reproducing this range.Small computer speakers are capable of reproducing a more limited range of frequencies.

  • Dynamic RangeDynamic range is the degree to which the sound gets louder and softer. The wider the dynamic range, the more natural a sound appears and he greater the emotional impact.Most recording systems seek to have the widest dynamic range possible.

  • FormatsSound use to come in only two media, tape and vinyl. Now, myriad formats are available, including CD and Minidisk.Some common computer formats include MP3, AIFF, WAV.

  • MIDIMIDI: Musical Instrument Digital InterfaceMIDI was developed in the mid-1980sAllows keyboard synthesizers talk to the computer. Ringtones

  • Audio on the InternetMP3 is a technology that created its own industry.Fueled mainly by college students, MP3 was a quick way to exchange and share music over the Internet.

  • Audio Internet FormatsThere are many different formats for audio on the Internet, but five of them are the most common.MP3RealAudioWindows Media PlayerQuickTimeAIFF and WAV

  • MP3the file extension for MPEG Audio Layer-3, a set of standards for compressing and downloading audio files from the Internet.Most popular formatWidely used for exchange music filesGood compression scheme Typical size per song: 3 to 4 MB.Although the legal issues are still being worked out, MP3 is here to stay.

  • QuickTimeApple Computer ProductQuickTime recently converted to a streaming formatBefore QuickTime, you had to download QuickTime files.

  • AIFF and WAVAIFF stand for Audio Interchange File Format WAV files are called wave files. Both are high-quality audio files, and both require a lot of memory. If you want CD-quality sound, AIFF or Wav will deliver it.

  • ReferencesDigital Creativity, Techniques for Digital Media and the Internet-Bruce Wands

  • When you make a copy of analog tape, you loose a generation each time a copy is made. This adds noise and hiss, and it changes the frequency response of the original material.One of the most important aspects of sound is the frequency range which it is recorded and played back.A typical dynamic range for a CD quality recording is 95 decibels (dB).In addition to the digital audio format, which is actual sound data there is MIDI. Audio is a growing part of the Internet. The MP3 phenomenon is proof of that. The technology had outstripped the ability of the recording industry and copyright lawyers to keep up with it.