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									Draft Technical Metadata for Digitized Audio                                   version 0.1                                                 10/22/2003
compiled by Michael Olson from the Library of Congress Audio-Visual Prototyping Project AMD.xsd


Number          Name                            Element Name             Attributes               Field Values             Description


TA-1           Audio Type                       analog_digi_flag                                                            Indicator of
                                                                                                  "Analog", "PhysDigital", "FileDigital" how this entity will be describe
TA-2           File size                        audio_block_size                                                            Describes
                                                                                                  Numberic Data. File size in bytes. the size of the audio file in bytes
TA-3           Encoding scheme                  audio_data_encoding                                                         Describes encoding scheme of the audio d
                                                                                                  "PCM" pulse code modulation and Sony "DSD"
TA-4           Bit Sample                       bits_per_sample                                   "16", "24" etc..          Number of bits per audio sample.
TA-5           Bit Order                        byte_order                                                                  Describes the bit order in a byte
TA-6           Checksum
TA-6.1                                          checksum_datetime                                                          Date and time the checksum calculation is
TA-6.2                                          checksum_type                                                              Type of checksum
TA-6.3                                          checksum_value                                                             Describes the value of the checksum
TA-7           Compression
TA-7.1                                          codec_creator_app                                 "Soundforge" etc.        Software program used to encode the aud
TA-7.2                                          codec_creator_app_version                         Numeric Data             Version of encoding software program.
TA-7.3                                          codec_name                                                                 The name and version of the compression
TA-7.4                                          codec_quality                                     "lossy" or "lossless"    Indicator if the codec is lossy or lossless.
TA-8           Data Rate
TA-8.1                                          data_rate                                                                   Data
                                                                                                  eg., "64", "128", "256", etc. rate of the audio in an MP3 or other c
TA-8.2                                          data_rate_mode                                    "fixed" or "variable"     Field for specifying whether data rate mod
TA-9           Sampling
TA-9.1                                          sampling_frequency                                "16", 24", etc.          Field for specifying the sampling rate of the
TA-9.2                                          first_sample_offset                               Numeric Data             Location of the first valid sound byte in the
TA-9.3                                          first_valid_byte_block                            Numeric Data             Location of the first valid sound byte in the
TA-9.4                                          last_valid_byte_block                             Numeric Data             Location of the last valid sound byte in the
TA-9.5                                          num_sample_frames                                 Numeric Data             The number of frames within an audio file.
TA-10          Format
TA-10.1                                         format_name                                                                Name of the Digital Audio format.
TA-10.2                                         format_note                                                                Free text note field for describing the forma
TA-10.3                                         format_version                                                             The format version of the Digital Audio file.
TA-11          Use
TA-11.1                                         file_role                                         "PM", DM", "UC"          Role fo the digitized audio file, eg., preserv
TA-11.2                                         security                                          free text                Description of any security devices associa
TA-12     Source physical characteristics
TA-12.1                                     phys_format                                                                Name of the audio source physical format.
TA-12.2                                     condition                                                                  Free text discription of the physical conditio
TA-12.3                                     dimensions                                                                 Dimensions width
                                                                     depth, diameter, gauge, height, length, note, thickness, units, of audio source material
TA-12.4                                     disposition                                                                What became of the audio source item. W
TA-12.5                                     generation                                                                 Generation of the audio source item that w
TA-13     Source Physical Condition
TA-13.1                                     base_material                                                             Base material of the source sound recordin
TA-13.2                                     binder                                                                    Type polyvinyl chloride.
                                                                                              "CA" Cellulose Acetate, "PVC"of adhesive used to bind recording su
TA-13.3                                     disc_surface                                                              Information on the type of disc surface. Eg
TA-13.4                                     oxide                                                                     The type of oxide used for the coating of a
TA-13.5                                     reflective layer                                                          The type of substrate on an optical disk.
TA-13.6                                     stock_brand                                                               The audio source stock type.
TA-14     Source audio characteristics
TA-14.1                                     groove                                                                         Groove type of audio source.
TA-14.2                                     track_format                                                                   Track format
                                                                                              "full track", "half track", "quarter track" of magnetic tape.
TA-14.3                                     tracking_type                                                                  Type of tracking code. In this case the trac
TA-14.4                                     tracking_value                                                                 Media Id number.
TA-14.5                                     noise_reduction                                   "DA", "DB", "FL", etc. Noise reduction system used in the source
TA-14.6                                     equalization                                                                   Equalization system inherent in the source
                                                                                              "FFRR" Full Frequency Range Recording, "RIAA" Recording Indus
TA-15     Source speed
TA-15.1                                     speed                                             "1 7/8 ips", "78 rpm" etc.Nominal speed of the source recording inc
TA-15.2                                     speed_adjustment                                                            Speed actually used at playback expresse
TA-15.3                                     speed_note                                                                  Note to state actual speed as a number or
TA-16     Digital File Info
TA-16.1                                     duration                                                                      Time duration of digital audio file.
TA-16.2                                     note                                                                          Free text field for recording any alterations
TA-16.3                                     num_channels                                      "1", "2" etc.               Number of audio chanels
TA-16.4                                     sound_channel_map                                                             Information about the
                                                                                              "1=left-front", "2=right-front", "3=center", etc. channedl configurati
TA-16.5                                     sound_field                                       "mono", "stereo", etc. Aural space of the digital audio file. Delim
TA-17     Calibration
TA-17.1                                     calibration_ext_int                                                           Indicator that the calibration information is
                                                                                              "ext" external, "int" internal
TA-17.2                                     calibration_location                              URL                         Temporary location of the calibration file if
TA-17.3                                     calibration_time_stamp                                                        Location of calibration tones within a file
TA-17.4                                     calibration_track_type                                                        The type of tracking code on audio source
ow this entity will be described in the METS document. Is the described file analog, PhysDigital, or FileDigital
 size of the audio file in bytes
coding scheme of the audio data
s per audio sample.
 bit order in a byte

e the checksum calculation is applied to the digital audio file.

 value of the checksum

gram used to encode the audio file.
coding software program.
d version of the compression algorithm used.
e codec is lossy or lossless.

he audio in an MP3 or other compressed file. Expressed in kbps
ifying whether data rate mode is fixed or variable.

 ifying the sampling rate of the digital audio file. Expressed in Khz.
 e first valid sound byte in the block.
 e first valid sound byte in the block.
 e last valid sound byte in the block.
of frames within an audio file.

Digital Audio format.
  field for describing the format.
 rsion of the Digital Audio file.

gitized audio file, eg., preservation master, duplicate master, access copy.
 any security devices associated with the digital audio file
audio source physical format.
 ription of the physical condition of the item. Eg. Sticky shed tape, chipped disc, etc..
 f audio source material
e of the audio source item. Was it reshelved, discarded, loaned, or destroyed.
  the audio source item that was digitized, eg., studio master, original disc, preservation tape copy, etc.

 of the source sound recording, eg. Plastic, glass, vinyl, metal, wax polycarbonate, etc.
sive used to bind recording surface to base material.
n the type of disc surface. Eg. Aluminum, acetate etc.
xide used for the coating of a tape recording, eg. Cobalt modified, chromium dioxide, etc.
ubstrate on an optical disk.
urce stock type.

of audio source.
of magnetic tape.
 ng code. In this case the tracking code will be a Media ID.

on system used in the source audio recording.
 ystem inherent in the source recording.

d of the source recording including unit of measure.
y used at playback expressed as a percentage of the nominal speed.
actual speed as a number or to state a deviation or speed correction.

 of digital audio file.
 for recording any alterations made to the digital audio file

bout the channedl configuration.
f the digital audio file. Delimited to stereo or mono.

 the calibration information is contaiuned within the file or externally.
cation of the calibration file if it is external.
alibration tones within a file
acking code on audio source such as a barcode or media ID number.
Required Status for Technical Audio Metadata
compiled by Michael Olson

Number          Name                       Required Status   Repeatable?


TA-1           Audio Type                  M                 No
TA-2           File size                   M                 No
TA-3           Encoding scheme             M                 No
TA-4           Bit Sample                  M                 No
TA-5           Bit Order                       MA            No
TA-6.1         Checksum Date                            O    No
TA-6.2         Checksum Type                            O    No
TA-6.3         Checksum Value                           O    No
TA-7.1         Codec Creator App                    R        No
TA-7.2         Codec Creator App Version            R        No
TA-7.3         Codec Name                           R        No
TA-7.4         Codec Quality                        R        No
TA-8.1         Data Rate                            R        No
TA-9.1         Sampling Frequency          M                 No
TA-9.2         First Sample Offset                      O    No
TA-9.3         First Valid Byte Block                   O    No
TA-9.4         Last Valid Byte Block                    O    No
TA-9.5         Num Sample Frames                        O    No
TA-10.1        Format Name                 M                 No
TA-10.2        Format Note                              O    No
TA-10.3        Format Version                  MA            No
TA-11.1        File Role                   M                 No
TA-11.2        Security                                 O    No
TA-12.1        Phys Format                 M                 No
TA-12.2        Condition                            R        Yes
TA-12.3        Dimensions                           R   O    Yes
TA-12.4        Disposition                              O    No
TA-12.5        Generation                           R        No
TA-13.1        Base material                        R        No
TA-13.2        Binder                               R        No
TA-13.3        Disc surface                         R        No
TA-13.4        Oxide                                R        No
TA-13.5        Reflective layer                     R        No
TA-13.6        Stock brand                          R        No
TA-14.1        Groove                                        No
TA-14.2        Track format                    MA            No
TA-14.3        tracking_type               M                 No
TA-14.4        tracking_value              M                 No
TA-14.5        noise_reduction                 MA            No
TA-14.6        equalization                         R        No
TA-15.1        speed                           MA            Yes
TA-15.2        speed_adjustment                MA            Yes
TA-15.3        speed_note                               O    Yes
TA-16.1        duration                    M                 No
TA-16.2        note                                     O    Yes
TA-16.3   num_channels             M       No
TA-16.4   sound_channel_map        M       No
TA-16.5   Sound Field              M       Yes
TA-17.1   Calibration Ext Int          O   No
TA-17.2   Lalibration Location         O   No
TA-17.3   Calibration Time Stamp       O   No
TA-17.4   Calibration Track Type       O   No
version 0.1 (10/27/03)



Notes




Checksum provided at Repository Ingestion
Checksum provided at Repository Ingestion
Checksum provided at Repository Ingestion



Applies to MP3 access copies only.


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