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Technology Stocks : e.Digital Corporation(EDIG) - Embedded Digital Technology -- Ignore unavailable to you. Want to Upgrade?

To: Walter Morton who wrote (1717)	1/13/1999 12:03:00 PM
From: Walter Morton	Respond to of 18366

THE TECHNICAL STUFF How does it work? On a compact disk one minute of music takes up ten megabytes of disk space. An average CD has about 8 to 10 songs taking up roughly four to five hundred megabytes of storage space. A CD can hold up to 650 MB of data or one hour of CD quality audio. Without compression it is not possible to store and play many songs on your hard drive. Compression technology makes it is possible to compress music to 10 % of its original size without loosing any noticeable quality. Audio Library uses the most advanced sound compression technology available today to record and compress CD quality music into a manageable file size in real-time on a 200 MHz computer. You can choose from a variety of compression rates depending on the quality you want. How does Celestial's compression technology compare to MP3? Celestial uses compression technology pioneered and developed by Bell Labs called PAC. This compression technology is capable of storing large audio files in a fraction of the space with no loss of audio quality. Bell Labs has been a leader in audio compression from the beginning. Bell has pioneered and perfected this process over the last twenty years. They contributed heavily to the MPEG standards for audio including the new MPEG AAC compression. AAC was frozen as a standard in 1996. Bell has continued perfecting and refining this process both computationally and in terms of quality and has created a more powerful compression technology than the current MPEG layer-3 or the future AAC standard. It outperforms in both quality of sound and speed at which it compresses. PAC uses a variable bit rate compression scheme which can adjust to the complexity of the music. PAC provides better audio quality at 96 kBits/s than MPEG layer-3 at 128 kBits/s or layer-2 at 192 kBits/s. On a 200 MHz computer PAC compresses five times faster than mp3 Producer Professional version 2.1 at 128 kBits/s with higher quality audio at same bit rate selections. PAC encodes only in one mode; top quality for every bit rate selected and does it in a fraction of the time it takes MPEG layer-3 to compress in high quality mode. But don't take our word for it, listen for yourself. What are the available bit rates? There are many bit rates to choose from depending on the quality you want. Bit rates start as low as 8 kBits/s for voice all the way up to 128 kBits/s for CD quality music indistinguishable from CD. Below is a list of recommended sample and bit rate combinations. Sample Rate Stereo Bit rates =================================================== 8000 S 18000, 20000 11025 S 18000, 20000, 24000 16000 S 18000, 20000, 24000, 30000 22050 S 18000, 20000, 24000 (premium rates) 32000 S 56000, 64000 44100 S 64000, 96000, 128000 Can Audio Library convert between sample rates? You cannot do sample rate conversion with Audio Library. If you want to convert from one sample rate to another you must use a program with that feature built in. There are programs available on the internet to convert between sample rates. Sound Forge and Cool Edit do a great job. Sample rate conversion is a processor intensive task. Audio Library will always create better sounding files if the file being compressed is captured in the same sample rate as the resulting compressed file. Does Audio Library compress mono files? Audio Library can only input files recorded in stereo. The next version will include mono output. Please submit your questions to webmaster@celestialtech.com © 1998 Celestial Technologies, Inc. For more information, please call 504-612-2965 or e-mail us at info@celestialtech.com.