Multimedia
sound

MPEG level 3 (mp3)

1. wavef.wav
   (324K , PCM 22,050 Hz, 8 Bit, Mono)
2. wavef.mp3
   (MP3 of 1 above 177KB)

• An open compression standard, designed for storing digital sounds suitable for the Internet.
• MP3 gives a 12:1 audio compression.
• A typical track on an audio CD takes 50MB. As an MP3 file this may be reduced to 4.5MB (making it feasible to download).
• As a general rule 1Mb equals about 1 minute of music
• The MP3 compression algorithms analyse the digital files to eliminate sounds inaudible to the human ear by running a high-pass/low-pass filter. This reduces the file size by up to 90%. The filters can be adjusted to increase the compression with a decrease in both file size and quality.

• 32MB onboard flash memory able to store up to 60 minutes digital quality audio or several hours of voice quality audio.
• Sounds may be downloaded from the internet.
• No moving parts
• Cost approx. NZ$600