Sound SituationFormats and Foundations

Cassette Tapes

• Introduced by the Music Industry

Cassette Tapes

• Introduced by the Music Industry

• Thin plastic ‘tape’ wound on to a spindle

Cassette Tapes

• Introduced by the Music Industry

• Thin plastic ‘tape’ wound on to a spindle

• Tape is layered with Ferric Oxide.

Cassette Tapes• Exposed to a magnetic field

Cassette Tapes• Exposed to a magnetic field

• 2 Key features of cassettes:

Cassette Tapes• Exposed to a magnetic field

• 2 Key features of cassettes:

• 1) can record material to the tape

Cassette Tapes• Exposed to a magnetic field

• 2 Key features of cassettes:

• 1) can record material to the tape

• 2) can easily erase the tape and re-record.

Compact Disc• Plastic Disk 4 1/100’s of an inch thick

Label

Acrylic

Aluminum

Plastic Base Material

Compact Disc• Plastic Disk 4 1/100’s of an inch thick

• Coated with Aluminum

Label

Acrylic

Aluminum

Plastic Base Material

Compact Disc• Plastic Disk 4 1/100’s of an inch thick

• Coated with Aluminum

• Continuous spiral of bumps underneath

Label

Acrylic

Aluminum

Plastic Base Material

Compact Disc• Plastic Disk 4 1/100’s of an inch thick

• Coated with Aluminum

• Continuous spiral of bumps underneath

• Single track of continuous data.

Label

Acrylic

Aluminum

Plastic Base Material

Compact Disc

• Information is written and read in a spiral

Compact Disc

• Information is written and read in a spiral

• Allows for CD’s of all sizes to be created.

CD Player Components

CD Player Components

• Drive Motor – spins the disc 200-500 x/sec

CD Player Components

• Drive Motor – spins the disc 200-500 x/sec

• Laser Lens – focuses on bumps and reads

CD Player Components

• Drive Motor – spins the disc 200-500 x/sec

• Laser Lens – focuses on bumps and reads

• Tracking Mechanism – moves the laser

CD Player Components

• Drive Motor – spins the disc 200-500 x/sec

• Laser Lens – focuses on bumps and reads

• Tracking Mechanism – moves the laser

• Must be able to track the bumpy spiral.

Digital Storage

• WAV – Waveform audio (uncompressed)

Digital Storage

• WAV – Waveform audio (uncompressed)• Similar in sound and size to CD Files

Digital Storage

• WAV – Waveform audio (uncompressed)• Similar in sound and size to CD Files• MPEG3 – Compressed audio format

Digital Storage

• WAV – Waveform audio (uncompressed)• Similar in sound and size to CD Files• MPEG3 – Compressed audio format• Created by Motion Picture Experts Group

Digital Storage

• WAV – Waveform audio (uncompressed)• Similar in sound and size to CD Files• MPEG3 – Compressed audio format• Created by Motion Picture Experts Group• First format driven by consumers

Digital Storage

• WAV – Waveform audio (uncompressed)• Similar in sound and size to CD Files• MPEG3 – Compressed audio format• Created by Motion Picture Experts Group• First format driven by consumers• CD song uses and average of 40 MB

Digital Storage

• WAV – Waveform audio (uncompressed)• Similar in sound and size to CD Files• MPEG3 – Compressed audio format• Created by Motion Picture Experts Group• First format driven by consumers• CD song uses and average of 40 MB• MP3 version of song would use 4 MB

Digital Storage

• WAV – Waveform audio (uncompressed)• Similar in sound and size to CD Files• MPEG3 – Compressed audio format• Created by Motion Picture Experts Group• First format driven by consumers• CD song uses and average of 40 MB• MP3 version of song would use 4 MB• Some CD’s have ability to read MP3.

Understanding MP3

• Re-saved = re-compressed

Understanding MP3

• Re-saved = re-compressed

• Loses quality

Understanding MP3

• Re-saved = re-compressed

• Loses quality

• Carries information in META Tags (ID3)

Understanding MP3

• Re-saved = re-compressed

• Loses quality

• Carries information in META Tags (ID3)

• Imbeds info on artist, title, album art

Understanding MP3

• Re-saved = re-compressed

• Loses quality

• Carries information in META Tags (ID3)

• Imbeds info on artist, title, album art

• Info can be displayed on screens

Understanding MP3

• Re-saved = re-compressed

• Loses quality

• Carries information in META Tags (ID3)

• Imbeds info on artist, title, album art

• Info can be displayed on screens

• Can search to restore lost info.

MP3 Players

• 1998 – first MP3 player introduced

MP3 Players

• 1998 – first MP3 player introduced

• Could store and play MP3

MP3 Players

• 1998 – first MP3 player introduced

• Could store and play MP3

• No moving parts - Solid State Memory

MP3 Players

• 1998 – first MP3 player introduced

• Could store and play MP3

• No moving parts - Solid State Memory

• Microprocessor inside.

MP3 Players

• Various Forms today

MP3 Players

• Various Forms today

• Flash Memory

MP3 Players

• Various Forms today

• Flash Memory

• Smaller storage, no moving parts

MP3 Players

• Various Forms today

• Flash Memory

• Smaller storage, no moving parts

• Better for jogging and active people

MP3 Players

• Various Forms today

• Flash Memory

• Smaller storage, no moving parts

• Better for jogging and active people

• Hard Drive Players (iPod)

MP3 Players

• Various Forms today

• Flash Memory

• Smaller storage, no moving parts

• Better for jogging and active people

• Hard Drive Players (iPod)

• Moving Parts

MP3 Players

• Various Forms today

• Flash Memory

• Smaller storage, no moving parts

• Better for jogging and active people

• Hard Drive Players (iPod)

• Moving Parts

• More fragile

MP3 Players

• Various Forms today

• Flash Memory

• Smaller storage, no moving parts

• Better for jogging and active people

• Hard Drive Players (iPod)

• Moving Parts

• More fragile

• Larger storage capacity