ISO-MPEG Audio Layer 3 software only Encoder and Decoder for PCs Version 1.50. copyright Fraunhofer - IIS 1994,1995 - evaluate highest quality perceptual audio compression technique available today - software only encoder and decoder implementations - implements ISO/MPEG Audio standard ISO/IEC IS 11172-3, Layer 3 (restriction: no realtime) - wide range of compression ratios including 6:1 fully transparent quality 11:1 64 kbps per channel, very high quality 16:1 still better than your average 16 bit 44.1 kHz sound card - music data is input in raw format (16 bit signed integer) or in RIFF/WAVE format as used by Microsoft Windows .WAV files - 44.1kHz sampling frequency (look for 32 kHz and 48 kHz in the near future) - packed bit stream conforming to ISO/MPEG Layer III - output of decoder is in raw format (16 bit signed integer), in SND format, in AIFF format or in RIFF/WAVE format as used by Microsoft Windows .WAV files - .WAV music files can be played with Windows Media Player - optional decoder output as 24 bit hex ascii data - written by the very same people at Fraunhofer-IIS who did the Layer III codecs for the ISO and ITU-R (former CCIR) tests (best sound quality at low bit rates at all listening tests) - commercial real time products for encoding and/or decoding of Layer III are available. Contact one of the companies listed in the file info.txt The package consists of the following files Disk 1: L3ENC.EXE encoder program V1.00 L3DEC.EXE decoder program V2.00 manual.txt instructions for encoder and decoder programs register.txt information on registration. PLEASE READ THIS! info.txt infos on ISO MPEG Layer III and Layer III products readme.txt this file history.txt infos on the history of this shareware product emx.exe DOS extender rsx.exe DOS extender emxrt.zip contains emx.exe dpmigcc5.zip contains rsx.exe Disk 2: contents.txt short discription of the following Layer 3 bitstreams funky.bit demo layer 3 bitstrem (96 kbit/s, stereo, 44.1 kHz) spot1.bit demo layer 3 bitstrem (96 kbit/s, stereo, 44.1 kHz) spot2.bit demo layer 3 bitstrem (96 kbit/s, stereo, 44.1 kHz) spot3.bit demo layer 3 bitstrem (96 kbit/s, stereo, 44.1 kHz) classic1.bit demo layer 3 bitstrem (56 kbit/s, stereo, 22.05 kHz) classic2.bit demo layer 3 bitstrem (48 kbit/s, stereo, 22.05 kHz) L3ENC uses one of the dos extenders EMX.EXE or RSX.EXE. These DOS extenders are NOT written by Fraunhofer IIS. They are supplied together with the Layer 3 shareware package for convenience. Please read the documentation and copyright infos accompanying the DOS extenders. The song used for funky.bit is named "Funky" and was composed and arranged by Juergen Herre. "Funky" is copyright Juergen Herre 1994. You may use "Funky" for all evaluation purposes of this shareware product. You may not use "Funky" for commercial purposes (e.g. radio broadcasting). The other bitstreams were provided by OMNI-Mediasound. This package is distributed as shareware. You may work with the package for 30 days for evaluation purposes. If you want to use this package after the evaluation period, you are required to register the package (see information in the file REGISTER.TXT). You may give copies of this package to other people as long as no file is changed and no file is omitted. The programms are written for IBM-PCs or Compatibles with MS-DOS. They require a 386 type CPU plus hardware floating point support. Especially for the encoder, a 486DX33 or better is recommended. On a 486DX2/66 the software-only decoder needs about 3 minutes for the decoding of 1 minute of stereo audio data. The encoder needs about 14 minutes to encode a 1 minute audio data file. These figures assume coding/decoding of stereo audio material at 44.1 kHz/sec. If you need further information on Layer 3 products or if you have any questions concerning this shareware product, please send email to layer3@iis.fhg.de. You can also fax or mail your questions to Layer 3 support Fraunhofer - IIS Am Weichselgarten 3 D-91058 Erlangen Germany Fax: + 49 9131 / 776 399 A version of this shareware for SUN workstations is also available. On a SPARC station 10 the decoder works in real time, the encoder takes about 5 minutes for the encoding of 1 minute of stereo audio data. Disclaimer: Don't forget that there are no warranties associated with this software. While we believe that our software is reasonably bug free and well behaved, we are in no way responsible if our software does not work the way you would expect it to work. No matter if it locks up your computer, garbles your floppy disks or does any other harmful things to your computer - it is entirely your problem. Fraunhofer - IIS is not liable for any infringments or damages of third parties' rights in consequencs of your use of this shareware product. Fraunhofer - IIS is in no event liable for, respectively does not warrant the trustworthiness, quality, industrial exploitability, serviceability of this shareware product for the supposed purpose or any other purposes. All brand names are registered trade marks of their respective owners.