Test patterns for ISO/MPEG Layer I
==================================


This directory contains 8 pairs of files with test patterns 
(one encoded bitstream, generated by a reference encoder 
and the corresponding decoded PCM output, generated by a 
reference decoder).

These data are intended for conformance testing of an ISO/MPEG Layer I
decoder implementation according to the ISO/IEC international standard 
IS 11172 (part 3 - audio). The conformance testing is described in 
part 4 of this standard.

The Layer I test data in this directory has been generated by:

	Philips International B.V
	Philips Consumer Electronics
	ADC - Broadcasting Laboratory
	Kastanjelaan, Bldg. SFJ-7.12, P.O.Box 80 002
	NL-5600 JB Eindhoven
	THE NETHERLANDS

Contact at Philips: Leon van de Kerkhof, 
		    email: vdkerkhof@nlvxe2.ce.philips.nl
		    phone: +31-40-734-039
		    fax:   +31-40-737-353

In the following, you find a description of the test patterns.
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For the input files, one slot (4 bytes in Layer I) is put on one line.
Each 4 bits are translated into one hex character, i.e. 8 characters 
per line.

For the output files, one output sample is put on one line. The samples
are represented with 24 bits accuracy, each 4 bits are translated into 
one hex character, i.e. 6 characters on one line.
For stereo output, the left and right output samples are interleaved,
so the left samples are on the even lines (starting to count with line 0),
the right samples are on the odd lines. 
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The information on the bit streams is:

 1:	Layer           I
	Fs              32 kHz
	bit rate        384 kbit/s
	CRC             yes
	mode            intensity stereo
	signal          -20 dB sweep in left and right
	#frames         49

	Filenames: fl1.mpg (encoded bitstream)
		   fl1.pcm (decoded PCM output)




 2:	Layer           I
	Fs              44.1 kHz
	bit rate        384 kbit/s
	CRC             yes
	mode            intensity stereo
	signal          -20 dB sweep in left and right
	#frames         49

	Filenames: fl2.mpg (encoded bitstream)
		   fl2.pcm (decoded PCM output)




 3:	Layer           I
	Fs              48 kHz
	bit rate        384 kbit/s
	CRC             yes
	mode            intensity stereo
	signal          -20 dB sweep in left and right
	#frames         49

	Filenames: fl3.mpg (encoded bitstream)
		   fl3.pcm (decoded PCM output)




 4:	Layer           I
	Fs              32 kHz
	bit rate        32 kbit/s
	CRC             no
	mode            single channel
	signal          -20 dB sweep
	#frames         49

	Filenames: fl4.mpg (encoded bitstream)
		   fl4.pcm (decoded PCM output)




 5:	Layer           I
	Fs              48 kHz
	bit rate        448 kbit/s
	CRC             yes
	mode            dual channel
	signal          -1 dB, 1 kHz sine wave in left, 
        	        -1 dB, 2 kHz sine wave in right
	#frames         49

	Filenames: fl5.mpg (encoded bitstream)
		   fl5.pcm (decoded PCM output)




 6: Layer           I
	Fs              44.1 kHz
	bit rate        384 kbit/s
	CRC             yes
	mode            stereo
	signal          noise in left and right
	remark          all subbands get all possible allocations
	#frames         49

	Filenames: fl6.mpg (encoded bitstream)
		   fl6.pcm (decoded PCM output)




 7: Layer           I
	Fs              44.1 kHz
	bit rate        384 kbit/s
	CRC             yes
	mode            stereo
	signal          special
	remark          all scalefactors occur
	#frames         63

	Filenames: fl7.mpg (encoded bitstream)
		   fl7.pcm (decoded PCM output)




 8:	Layer           I
	Fs              44.1 kHz
	bit rate        384 kbit/s
	CRC             no
	mode            stereo
	signal          -20 dB sweep in left and right, from 0 to 10 kHz, 
	remark          for compliance test (see CD 11172-4)
	#frames         49

	Filenames: fl8.mpg (encoded bitstream)
		   fl8.pcm (decoded PCM output)



_____________________________________________________________________________
Hendrik Fuchs
Universitaet Hannover
Institut fuer Theoretische Nachrichtentechnik und Informationsverarbeitung
Appelstrasse 9A, D-30167 Hannover, Germany

fuchs@tnt.uni-hannover.de   phone: +49-511-762-5329   fax: +49-511-762-5333
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