wb_params.sr

speech signal process tools

# 
# @(#)wb_params.sr	1.2 3/28/90 ESI ATT
# These parameters determine the characteristics of the "wide-band" 
# spectrogram.  Parameter specifications take the form
#	key_word <value>
# Each line may contain one or several of these pairs.  All specifications
# except the error diffusion filter are optional and may occur in any order.
# All comments and blank lines in this file are optional except the line
# preceeding the spatial filter coefficients which begins with an asterisk.
# Parameters may be changed with any text editor while waves is running so
# that the effects of changes may be readily observed.

# duration of the window applied to the time series (ms).
# The bandwidth of the analysis is inversely proportional to this.
win_size_ms 8.

# type of time weighting (windowing) to use when computing the DFT's
# 0 ==> rectangular; 1 ==> Hamming; 2 ==> cos**4; 3 ==> Hanning
window_type 1

# time step between adjacent columns in the spectrogram (ms)
# This effects both the time resolution and horizontal magnification.
win_step_ms 2


# coefficient of the first-order preemphasis filter
# A value of -1.0 yields +6dB/oct preemphasis; 0.0 results in no preemphasis.
preemp -.7

# minimum size of the (radix-2) FFT to use in computing spectra (points)
# This is automatically increased as necessary to accommodate the window size.
fft_points	256

# number of pixels displayed vertically for each frequency sample (pixels)
# The vertical size of the display in pixels will thus be
#		(freq_intrp * fft_points)/2.
# This variable (freq_intrp) applies only to spectrograms computed by 
# an external DSP board -- see also min_spec_height in .wave_pro
freq_intrp	3

# factor by which spectral log-magnitude values are multiplied before display
# A value of 1.0 is recommended unless the dynamic range must be limited.
ampl_scale       1

# a constant subtracted from spectral log-magnitude values before display (dB)
# This may be used to adjust for overall signal level, if desired.
ampl_offset_db  40

# fraction of spectral log-magnitude mean subtracted from spectra for display
# Note that this interacts with the ampl_offset_db.
agc_ratio	0

# fraction of spectral variance used to normalize displayed variance
# This is best left at 0.0 for now...
var_norm	0.0

# name of the program to run on the DSP-32 card for spectrogram computation
dsp_prog_name $WAVES_32BIN/dspgm

# dimensions of the error-diffusion spatial filter (pixels)
# These dimensions are only used for monochrome spectrograms.
# For wide-band spectrograms y_dither should be larger than x_dither.
# For narrow-band spectrograms x_dither should be >= y_dither.
# The number of rows and columns should be odd and >= 3.  The coefficients
# may have any value.  If x_dither and y_dither are specified the filter
# coefficients MUST be specified.  The COEFFICIENTS MUST IMMEDIATELY FOLLOW
# THE LINE STARTING WITH THE ASTERISK AND BE THE LAST ITEMS IN THIS FILE.
x_dither	3
y_dither	11

# coefficients of the error-diffusion spatial filter
# The first coefficient in the list is for the lower left corner; the last is
# for the upper right corner.  Note that the last (y_dither/2) coefficients
# are zero and are not used.  The middle entry in the last column is the
# weighting given to the spectral amplitude being quantized.  The other
# coefficients are used to weight the quantization errors of surrounding
# pixels.
* the x_dither by y_dither error-diffusion spatial filter follows
1. 1.5 2. 3. 4. 5. 4. 3. 2. 1.5 1.
2. 3. 4. 6. 8. 10. 8. 6. 4. 3. 2.
4. 6. 8. 12. 16. 1. 0. 0. 0. 0. 0.