CDP Spectral Processing Function Groups

The CDP Spectral processes operate mainly on Frequency Analysis files (.ana), derived from sound files using the FFT function PVOC ANAL. An alternative supported format is PVOC-EX (.pvx). Other processes manipulate pitch data extracted from the time-varying spectrum (see REPITCH). See the INTRODUCTION for more detail on the nature of processing in the spectral domain.

CLICK ON THE GROUP NAME TO THE LEFT TO ACCESS THE CDP REFERENCE DOCUMENTATION ON THE FUNCTION GROUP.

CLICK ON THE GROUP NAME BELOW TO SEE A LIST OF FUNCTIONS IN THE GROUP.

BLUR (Time) – various means to diffuse the clarity of the original sound
COMBINE (Spectra) – combine analysis data from two or more files
FOCUS – isolate and hold particular data
FORMANTS – formant data, more generally, the spectral envelope
HILITE (Amplitude) – pick out and emphasise various aspects of analysis data
MORPH – create smooth transitions between sounds, using amplitude and frequency analysis data
ONEFORM – operations with single formants
PITCH (& Harmony/Freq) – operations based on partials
PITCHINFO (Pitch Data Info) – access information about partials or extracted pitch traces
PVOC – FFT analysis and resynthesis
REPITCH (Pitch Data) – extract and alter pitch-related data
SPEC (Gain/Edit) – basic utilities in the spectral domain
SPECFNU – Modify spectral shape in relation to formant peaks
SPECNU – various functions, mainly to clean up analysis files
SPECINFO – information about spectral data
STRANGE – some unusual and unpredictable effects
STRETCH – stretch time or frequency data
R8 NEW – list of Spectral Programs in CDP Release 8

New Spectral Functions in CDP Release 8

[PVOC] ANA2PVX
Convert CDP analysis file to PVOC-EX file

[BLUR] CALTRAIN
Time-blur the upper spectral channels

[SPECNU] FRACTAL SPECTRUM
Fractally distort spectrum by transposition

[PVOC] FTURANAL ANAL
Extract spectral features from an analysis file and output to a textfile

[PVOC] FTURANAL SYNTH
Use spectral features data to reassemble MONO source file

[SPECNU] MATRIX
Matrix manipulation of spectrum of sound

[PVOC] PVOCEX2
Stereo phase vocoder based on CARL pvoc (Mark Dolson)

[FORMANTS] SPECENV
Extract the spectral envelope of file 2 and apply it to file 1

SPECFNU
Modify spectral shape in relation to formant peaks

[FOCUS] SPECFOLD
Fold, invert or randomise the spectrum

[STRETCH] SPECTSTR
Time-stretch analysis file, suppressing artefacts when stretch > 1

[PITCH] SPECTUNE
Find most prominent pitch and transpose file to it

[SPECNU] SPECULATE
Generate versions of source with channel data progressively permutated

[BLUR] SUPPRESS PARTIALS
Suppress the most prominent partials in the frequency band indicated

Alphabetical List of Spectral Functions

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

A

FOCUS ACCU
Sustain each spectral band, until louder data appears in that band

PITCH ALTHARMS
Delete alternate harmonics

[PVOC] ANA2PVX
Convert CDP analysis file to PVOC-EX file

PVOC ANAL
Convert soundfile to spectral file

REPITCH ANALENV
Extract the window-loudness envelope of an analysis file

ANALJOIN JOIN
Join analysis files together

REPITCH APPROX
Make an approximate copy of a pitchfile

HILITE ARPEG
Arpeggiate the spectrum

BLUR AVRG
Average spectral energy over N adjacent channels
FOCUS ACCU: Sustain each spectral band, until louder data appears in that band
PITCH ALTHARMS: Delete alternate harmonics
[PVOC] ANA2PVX: Convert CDP analysis file to PVOC-EX file
PVOC ANAL: Convert soundfile to spectral file
REPITCH ANALENV: Extract the window-loudness envelope of an analysis file
ANALJOIN JOIN: Join analysis files together
REPITCH APPROX: Make an approximate copy of a pitchfile
HILITE ARPEG: Arpeggiate the spectrum
BLUR AVRG: Average spectral energy over N adjacent channels
B

HILITE BAND
Split spectrum into bands and process these individually

SPEC BARE
Zero the data in channels that do not contain harmonics

HILITE BLTR
Blur the spectral data over time, and TRACE the partials

BLUR BLUR
Blur the spectral data over time

MORPH BRIDGE
Make a bridging interpolation between two sound spectra by interpolating between 2 time-specified windows in the 2 infiles

[REPITCH] BRKTOPI
Convert a breakpoint pitch data file to a binary pitch data file

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HILITE BAND: Split spectrum into bands and process these individually
SPEC BARE: Zero the data in channels that do not contain harmonics
HILITE BLTR: Blur the spectral data over time, and TRACE the partials
BLUR BLUR: Blur the spectral data over time
MORPH BRIDGE: Make a bridging interpolation between two sound spectra by interpolating between 2 time-specified windows in the 2 infiles
[REPITCH] BRKTOPI: Convert a breakpoint pitch data file to a binary pitch data file
C

[BLUR] CALTRAIN
Time-blur the upper spectral channels

SPECINFO CHANNEL
Returns PVOC channel number corresponding to frequency given

PITCH CHORD
Transposed versions of a sound are superimposed on the original

PITCH CHORDF
Transposed versions of the spectrum are superimposed within the existing spectral envelope

BLUR CHORUS
Add random variation to amplitude or frequency in analysis channels

SPEC CLEAN
Remove noise from PVOC analysis file

SPECNU CLEAN
Eliminate from the source file any persisting signal that falls below a threshold (defined by the noisfile)

ONEFORM COMBINE
Generate a new sound from pitch information and a single-moment-formant

REPITCH COMBINE
Generate transposition data from 2 sets of pitch data,
or transpose pitch data with transposition data,
or combine 2 sets of transposition data to form new transposition data, producing a binary pitch data file output

REPITCH COMBINEB
Generate transposition data from 2 sets of pitch data,
or transpose pitch data with transposition data,
or combine 2 sets of transposition data to form new transposition data, producing a time value breakpoint file output

PITCHINFO CONVERT
Convert a binary pitch data file to a time frequency breakpoint text file
REPITCH CUT
Cut out and keep a segment of a binary pitch data file

SPEC CUT
Cut a section out of an analysis file, between starttime and endtime (seconds)

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[BLUR] CALTRAIN: Time-blur the upper spectral channels
SPECINFO CHANNEL: Returns PVOC channel number corresponding to frequency given
PITCH CHORD: Transposed versions of a sound are superimposed on the original
PITCH CHORDF: Transposed versions of the spectrum are superimposed within the existing spectral envelope
BLUR CHORUS: Add random variation to amplitude or frequency in analysis channels
SPEC CLEAN: Remove noise from PVOC analysis file
SPECNU CLEAN: Eliminate from the source file any persisting signal that falls below a threshold (defined by the noisfile)
ONEFORM COMBINE: Generate a new sound from pitch information and a single-moment-formant
REPITCH COMBINE: Generate transposition data from 2 sets of pitch data,
or transpose pitch data with transposition data,
or combine 2 sets of transposition data to form new transposition data, producing a binary pitch data file output
REPITCH COMBINEB: Generate transposition data from 2 sets of pitch data,
or transpose pitch data with transposition data,
or combine 2 sets of transposition data to form new transposition data, producing a time value breakpoint file output
PITCHINFO CONVERT: Convert a binary pitch data file to a time frequency breakpoint text file
REPITCH CUT: Cut out and keep a segment of a binary pitch data file
SPEC CUT: Cut a section out of an analysis file, between starttime and endtime (seconds)
D

COMBINE DIFF
Find (and retain) the difference between two spectra

BLUR DRUNK
Modify sound by a drunken walk along analysis windows
COMBINE DIFF: Find (and retain) the difference between two spectra
BLUR DRUNK: Modify sound by a drunken walk along analysis windows
E

FOCUS EXAG
Exaggerate the spectral contour

REPITCH EXAG
Exaggerate pitch contour

PVOC EXTRACT
Analyse, then resynthesise with various options

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FOCUS EXAG: Exaggerate the spectral contour
REPITCH EXAG: Exaggerate pitch contour
PVOC EXTRACT: Analyse, then resynthesise with various options
F

HILITE FILTER
Hipass, lopass, bandpass and notch filters, on spectral data

REPITCH FIX
Massage pitch data in a binary pitchfile

FOCUS FOCUS
Focus spectral energy onto the peaks in the spectrum

FOCUS FOLD
Octave-transpose spectral components into a specified frequency range

FOCUS FREEZE
Freeze the spectral characteristics in a sound, at given times, for specified durations
SPECINFO FREQUENCY
Returns centre frequency of PVOC channel specified

[SPECNU] FRACTAL SPECTRUM
Fractally distort spectrum by transposition

[PVOC] FTURANAL ANAL – Extract spectral features from an analysis file and output to a textfile

[PVOC] FTURANAL SYNTH – Use spectral features data to reassemble MONO source file
HILITE FILTER: Hipass, lopass, bandpass and notch filters, on spectral data
REPITCH FIX: Massage pitch data in a binary pitchfile
FOCUS FOCUS: Focus spectral energy onto the peaks in the spectrum
FOCUS FOLD: Octave-transpose spectral components into a specified frequency range
FOCUS FREEZE: Freeze the spectral characteristics in a sound, at given times, for specified durations
SPECINFO FREQUENCY: Returns centre frequency of PVOC channel specified
[SPECNU] FRACTAL SPECTRUM: Fractally distort spectrum by transposition
[PVOC] FTURANAL ANAL – Extract spectral features from an analysis file and output to a textfile
[PVOC] FTURANAL SYNTH – Use spectral features data to reassemble MONO source file
G

SPEC GAIN
Amplify or attenuate the spectrum

SPEC GATE
Eliminate channel data below a threshold amplitude

REPITCH GENERATE
Create binary pitch data from a textfile of time midi value pairs

FORMANTS GET
Extract evolving formant envelope from an analysis file

ONEFORM GET
Extract formant-envelope at a specific time in an existing CDP formant file

GET_PARTIALS
Extract relative amplitude of partials in a pitched source

REPITCH GETPITCH
Extract pitch from spectrum to a pitch data file

FORMANTS GETSEE
Get formant data from an analysis file and write as a pseudo-soundfile for viewing

STRANGE GLIS
Create glissandi inside the (changing) spectral envelope of the original sound

GLISTEN
Randomly partition the spectrum into bins and play back in order

SPEC GRAB
Grab a single analysis window at time point specified

HILITE GREQ
Graphic eq type filter on the spectrum

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SPEC GAIN: Amplify or attenuate the spectrum
SPEC GATE: Eliminate channel data below a threshold amplitude
REPITCH GENERATE: Create binary pitch data from a textfile of time midi value pairs
FORMANTS GET: Extract evolving formant envelope from an analysis file
ONEFORM GET: Extract formant-envelope at a specific time in an existing CDP formant file
GET_PARTIALS: Extract relative amplitude of partials in a pitched source
REPITCH GETPITCH: Extract pitch from spectrum to a pitch data file
FORMANTS GETSEE: Get formant data from an analysis file and write as a pseudo-soundfile for viewing
STRANGE GLIS: Create glissandi inside the (changing) spectral envelope of the original sound
GLISTEN: Randomly partition the spectrum into bins and play back in order
SPEC GRAB: Grab a single analysis window at time point specified
HILITE GREQ: Graphic eq type filter on the spectrum
H

PITCHINFO HEAR
Convert binary pitchfile to analysis test tone file (resynthesise to hear pitch)

FOCUS HOLD
Hold sound spectrum, at given times
PITCHINFO HEAR: Convert binary pitchfile to analysis test tone file (resynthesise to hear pitch)
FOCUS HOLD: Hold sound spectrum, at given times
I

PITCHINFO INFO
Display information about pitch data in pitchfile

REPITCH INSERTSIL
Mark areas as silent in a pitch data file

REPITCH INSERTZEROS
Mark areas as unpitched in a pitch data file

COMBINE INTERLEAVE
Interleave (groups of) windows of several spectra

REPITCH INTERP
Replace noise or silence by pitch interpolated from existing pitches

REPITCH INVERT
Invert pitch contour of a pitch data file

STRANGE INVERT
Invert the spectrum

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PITCHINFO INFO: Display information about pitch data in pitchfile
REPITCH INSERTSIL: Mark areas as silent in a pitch data file
REPITCH INSERTZEROS: Mark areas as unpitched in a pitch data file
COMBINE INTERLEAVE: Interleave (groups of) windows of several spectra
REPITCH INTERP: Replace noise or silence by pitch interpolated from existing pitches
REPITCH INVERT: Invert pitch contour of a pitch data file
STRANGE INVERT: Invert the spectrum
J
K
L

SPECINFO LEVEL
Convert (varying) level of analysis file to a pseudo-soundfile, for viewing (1 window -> 1 sample)
SPECINFO LEVEL: Convert (varying) level of analysis file to a pseudo-soundfile, for viewing (1 window -> 1 sample)
M

COMBINE MAKE
Generate an analysis file from data in a formant data file and a pitch data file

COMBINE MAKE2
Generate a spectrum from only pitch, formant & envelope data

SPEC MAGNIFY
Expand (in duration) a single analysis window

[SPECNU] MATRIX
Matrix manipulation of spectrum of sound

COMBINE MAX
Retain loudest channel components per window amongst several spectra

COMBINE MEAN
Generate the mean of two spectra
COMBINE MAKE: Generate an analysis file from data in a formant data file and a pitch data file
COMBINE MAKE2: Generate a spectrum from only pitch, formant & envelope data
SPEC MAGNIFY: Expand (in duration) a single analysis window
[SPECNU] MATRIX: Matrix manipulation of spectrum of sound
COMBINE MAX: Retain loudest channel components per window amongst several spectra
COMBINE MEAN: Generate the mean of two spectra
N

NEWMORPH & NEWMORPH2
Morph between dissimilar spectra

BLUR NOISE
Add noise to spectrum

REPITCH NOISETOSIL
Replace unpitched windows by silence

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NEWMORPH & NEWMORPH2: Morph between dissimilar spectra
BLUR NOISE: Add noise to spectrum
REPITCH NOISETOSIL: Replace unpitched windows by silence
O

PITCH OCTMOVE
Octave transpose without a formant shift

SPECINFO OCTVU
Text display of time varying amplitude of spectrum, within octave bands
PITCH OCTMOVE: Octave transpose without a formant shift
SPECINFO OCTVU: Text display of time varying amplitude of spectrum, within octave bands
P

REPITCH PCHSHIFT
Transpose pitches in a pitch data file by a constant number of semitones

REPITCH PCHTOTEXT
Convert binary pitch data to textfile

SPECINFO PEAK
Locate time varying energy centre of spectrum (text display)

PEAK EXTRACT
Extract peaks from an analysis file and write to a text file

PITCH PICK
Only retain channels which might hold specified partials

REPITCH PITCHTOSIL
Replace pitched windows by silence

HILITE PLUCK
Emphasise spectral changes (use e.g. with HILITE ARPEG)

SPECINFO PRINT
Print data in an analysis file as text to file

ONEFORM PUT
Impose the formant-envelope in a single-moments-formant datafile onto the sound in an analysis file

FORMANTS PUT
Impose formants in a formant data file on the spectrum in a PVOC analysis file

PVOC ANAL
Convert soundfile to spectral file

PVOC EXTRACT
Analyse, then resynthesise sound with various options

PVOC SYNTH
Convert spectral file to soundfile

[PVOC] PVOCEX2
Stereo phase vocoder based on CARL pvoc (Mark Dolson)

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REPITCH PCHSHIFT: Transpose pitches in a pitch data file by a constant number of semitones
REPITCH PCHTOTEXT: Convert binary pitch data to textfile
SPECINFO PEAK: Locate time varying energy centre of spectrum (text display)
PEAK EXTRACT: Extract peaks from an analysis file and write to a text file
PITCH PICK: Only retain channels which might hold specified partials
REPITCH PITCHTOSIL: Replace pitched windows by silence
HILITE PLUCK: Emphasise spectral changes (use e.g. with HILITE ARPEG)
SPECINFO PRINT: Print data in an analysis file as text to file
ONEFORM PUT: Impose the formant-envelope in a single-moments-formant datafile onto the sound in an analysis file
FORMANTS PUT: Impose formants in a formant data file on the spectrum in a PVOC analysis file
PVOC ANAL: Convert soundfile to spectral file
PVOC EXTRACT: Analyse, then resynthesise sound with various options
PVOC SYNTH: Convert spectral file to soundfile
[PVOC] PVOCEX2: Stereo phase vocoder based on CARL pvoc (Mark Dolson)
Q

REPITCH QUANTISE
Quantise pitches in a pitch data file
REPITCH QUANTISE: Quantise pitches in a pitch data file
R

SPECNU RAND
Randomise the order of spectral windows

REPITCH RANDOMISE
Randomise pitch line

SPECNU REMOVE
Remove a pitched component from the spectrum of a sound

SPECINFO REPORT
Text report on location of frequency peaks in the evolving spectrum

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SPECNU RAND: Randomise the order of spectral windows
REPITCH RANDOMISE: Randomise pitch line
SPECNU REMOVE: Remove a pitched component from the spectrum of a sound
SPECINFO REPORT: Text report on location of frequency peaks in the evolving spectrum
S

BLUR SCATTER
Randomly thin the spectrum

FORMANTS SEE
Convert formant data in binary formant data file to a pseudo soundfile for viewing

PITCHINFO SEE
Convert binary pitchfile or transposition file to a pseudo-soundfile, for viewing

SELFSIM
Replace spectral windows with the most similar, louder window(s)

STRANGE SHIFT
Linear frequency shift of (part of) the spectrum (becomes inharmonic)

BLUR SHUFFLE
Shuffle analysis windows according to a specific scheme

SPECNU SLICE
Divide an anlysis file into individual frequency bands, saving each as a separate analysis file

REPITCH SMOOTH
Smooth pitch contour in a pitch data file

[FORMANTS] SPECENV
Extract the spectral envelope of file 2 and apply it to file 1

SPECFNU
Modify spectral shape in relation to formant peaks, or show formant data

[FOCUS] SPECFOLD
Fold, invert or randomise the spectrum

SPECGRIDS
Partition the spectrum into parts, over a grid

SPECROSS PARTIALS
Interpolate partials of pitched inanalfile1 towards those of pitched inanalfile2

SPECSPHINX
Impose the channel amplitudes of analfile2 onto the channel frequencies of analfile1

STRETCH SPECTRUM
Stretch/compress the frequencies in the spectrum

SPECTWIN
Combine the formant and/or total spectral envelopers of two spectra

BLUR SPREAD
Spread spectral peaks

SPECNU SQUEEZE
Squeeze the spectrum into a frequency range, around a specified centre frequency

FOCUS STEP
Step-frame through a sound by freezing the spectrum at regular time intervals

[STRETCH] SPECTSTR
Time-stretch analysis file, suppressing artefacts when stretch > 1

[PITCH] SPECTUNE
Find most prominent pitch and transpose file to it

[SPECNU] SPECULATE
Generate versions of source with channel data progressively permutated

SPECNU SUBTRACT
Eliminate from the source file any persisting signal that falls below a threshold (defined by the noisfile) AND subtract the amplitude of the noise in the noisfile from any source file signal that is passed

COMBINE SUM
Add one spectrum to another

SUPERACCU
Sustain each spectral band until louder data appears in that band

BLUR SUPPRESS
Suppress the most prominent channel data

[BLUR] SUPPRESS PARTIALS
Suppress the most prominent partials in the frequency band indicated

PVOC SYNTH
Convert spectral file to soundfile

REPITCH SYNTH
Create spectrum of vowel sounds, following pitch contour in pitch data file

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BLUR SCATTER: Randomly thin the spectrum
FORMANTS SEE: Convert formant data in binary formant data file to a pseudo soundfile for viewing
PITCHINFO SEE: Convert binary pitchfile or transposition file to a pseudo-soundfile, for viewing
SELFSIM: Replace spectral windows with the most similar, louder window(s)
STRANGE SHIFT: Linear frequency shift of (part of) the spectrum (becomes inharmonic)
BLUR SHUFFLE: Shuffle analysis windows according to a specific scheme
SPECNU SLICE: Divide an anlysis file into individual frequency bands, saving each as a separate analysis file
REPITCH SMOOTH: Smooth pitch contour in a pitch data file
[FORMANTS] SPECENV: Extract the spectral envelope of file 2 and apply it to file 1
SPECFNU: Modify spectral shape in relation to formant peaks, or show formant data
[FOCUS] SPECFOLD: Fold, invert or randomise the spectrum
SPECGRIDS: Partition the spectrum into parts, over a grid
SPECROSS PARTIALS: Interpolate partials of pitched inanalfile1 towards those of pitched inanalfile2
SPECSPHINX: Impose the channel amplitudes of analfile2 onto the channel frequencies of analfile1
STRETCH SPECTRUM: Stretch/compress the frequencies in the spectrum
SPECTWIN: Combine the formant and/or total spectral envelopers of two spectra
BLUR SPREAD: Spread spectral peaks
SPECNU SQUEEZE: Squeeze the spectrum into a frequency range, around a specified centre frequency
FOCUS STEP: Step-frame through a sound by freezing the spectrum at regular time intervals
[STRETCH] SPECTSTR: Time-stretch analysis file, suppressing artefacts when stretch > 1
[PITCH] SPECTUNE: Find most prominent pitch and transpose file to it
[SPECNU] SPECULATE: Generate versions of source with channel data progressively permutated
SPECNU SUBTRACT: Eliminate from the source file any persisting signal that falls below a threshold (defined by the noisfile) AND subtract the amplitude of the noise in the noisfile from any source file signal that is passed
COMBINE SUM: Add one spectrum to another
SUPERACCU: Sustain each spectral band until louder data appears in that band
BLUR SUPPRESS: Suppress the most prominent channel data
[BLUR] SUPPRESS PARTIALS: Suppress the most prominent partials in the frequency band indicated
PVOC SYNTH: Convert spectral file to soundfile
REPITCH SYNTH: Create spectrum of vowel sounds, following pitch contour in pitch data file
T

STRETCH TIME
Stretch/ compress a sound in time without changing the pitch

HILITE TRACE
Highlight n loudest partials, at each moment (window) in time

PITCH TRANSP
Shift pitch of (part of) the spectrum, keeping harmonic relationships

REPITCH TRANSPOSE
Transpose spectrum (spectral envelope also moves)

REPITCH TRANSPOSEF
Transpose spectrum: but retain original spectral envelope

PITCH TUNE
Replace spectral frequencies by harmonics of specified pitch(es)

TUNEVARY
Replace spectral frequencies with the harmonics of specified pitch(es)
STRETCH TIME: Stretch/ compress a sound in time without changing the pitch
HILITE TRACE: Highlight n loudest partials, at each moment (window) in time
PITCH TRANSP: Shift pitch of (part of) the spectrum, keeping harmonic relationships
REPITCH TRANSPOSE: Transpose spectrum (spectral envelope also moves)
REPITCH TRANSPOSEF: Transpose spectrum: but retain original spectral envelope
PITCH TUNE: Replace spectral frequencies by harmonics of specified pitch(es)
TUNEVARY: Replace spectral frequencies with the harmonics of specified pitch(es)
U
V

REPITCH VIBRATO
Add vibrato to pitch in a pitch data file

FORMANTS VOCODE
Impose spectral envelope of one 2^nd sound onto 1^st sound

HILITE VOWELS
Impose vowels on a sound

REPITCH VOWELS
Create spectrum of vowel sounds, following pitch contour in a pitch data file

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REPITCH VIBRATO: Add vibrato to pitch in a pitch data file
FORMANTS VOCODE: Impose spectral envelope of one 2^nd sound onto 1^st sound
HILITE VOWELS: Impose vowels on a sound
REPITCH VOWELS: Create spectrum of vowel sounds, following pitch contour in a pitch data file
W

STRANGE WAVER
Oscillate between harmonic and inharmonic state

BLUR WEAVE
Weave amongst the analysis windows in a specified pattern

SPECINFO WINDOWCNT
Returns the number of analysis windows in infile
STRANGE WAVER: Oscillate between harmonic and inharmonic state
BLUR WEAVE: Weave amongst the analysis windows in a specified pattern
SPECINFO WINDOWCNT: Returns the number of analysis windows in infile
X
Y
Z

PITCHINFO ZEROS
Shows whether a pitch file contains uninterpolated zeros (unpitched windows)
PITCHINFO ZEROS: Shows whether a pitch file contains uninterpolated zeros (unpitched windows)

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CDP DOCSSPECTRAL

CDP Spectral Processing Function Groups

New Spectral Functions in CDP Release 8

Alphabetical List of Spectral Functions

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

A

B

C

D

E

F

G

H

I

J

K

L

M

N

O

P

Q

R

S

T

U

V

W

X

Y

Z

CDP DOCS
SPECTRAL