- Import Measured Data Ctrl+I
- Used to import data from other applications or to load data which
has been saved in a text format. See
Importing Measurement Data for details.
The path to the file is remembered for the next time the dialogue appears.
- Import Impulse Response Ctrl+I
- Used to import an impulse response from a WAV file or a .pcm file (raw data) as produce by ETF from Full Range
measurements using the File -> Write Impulse As *.pcm option. The sample rate must be specified
manually for .pcm files as it is not contained in the file (ETF shows the sample rate in the pop-up which appears
after exporting the response). WAV files cam be mono, stereo or multi-channel, the channel to be imported can
be chosen when loading the file. Only Signed PCM WAV files are supported, with 16, 24 or 32 bit samples.
To re-scale the impulse response for a desired peak SPL figure in the frequency response use the
Scale Impulse Response controls in the Impulse Response Controls
graph group. The path to the file is remembered for the next time the dialogue appears.
- Save Channel Filter Settings Ctrl+S
- Saves the EQ filter settings for the current channel in a binary
format with the extension ".req". A note can be entered that is
displayed when the settings are next loaded. The path to the file is
remembered for the next time the dialogue appears.
- Load Channel Filter Settings Ctrl+L
- Load a set of EQ filter settings for the current channel from a .req file.
Any note saved with the settings will be displayed. If the .req file has
more than one channel of filters a selection box is offered to choose the
channel to load the filters from. All channel EQ filter
settings will be overwritten by the settings in the file.
- Save Filter Settings All Channels Ctrl+Alt+S
- Saves the current EQ filter settings for all channels in a binary
format with the extension ".req". A note can be entered that is
displayed when the settings are next loaded. The path to the file is
remembered for the next time the dialogue appears.
- Load Filter Settings All Channels Ctrl+Alt+L
- Load a set of EQ filter settings for all channels from a .req file.
Any note saved with the settings will be displayed. All EQ filter
settings will be overwritten by the settings in the file.
- Save Measured Data Set Ctrl+Shift+S
- Save the measured data for all channels in a single file with the
extension ".mdat". A note can be entered that is displayed when the
data set is next loaded. The path to the file is remembered for the
next time the dialogue appears.
- Load Measured Data Set Ctrl+Shift+L
- Load a set of measured data from a .mdat file. Any note saved
with the data set will be displayed. Any data the Wizard has measured for a
channel will be overwritten by data from the file, if the file contains data
for that channel. The path to the file is remembered for the next time
the dialogue appears.
- Load House Curve Ctrl+Shift+H
- Load a set of data defining the desired shape of the target response. The
data is used to define an offset curve that is added to the traces generated from the
bass management responses for the speaker types defined for each channel. The file is plain text
consisting of pairs of frequency and offset values separated by spaces, tabs or commas. Linear
interpolation is used between the pairs of values, the first and last values are used for frequencies
below and above the range of the data respectively.
- Each line of data must have a frequency value (which is in Hz) and an offset value
(which is in dB)
- The points can be at arbitrary frequency spacing, but each
line must have a higher frequency than the one before and there
must be at least 2 freq, offset data pairs
- Only lines which begin with a number are loaded, others
are ignored
- In comma-delimited files there must be at least one space after the comma
- Spaces before values are ignored
The house curve would typically be used to define a boost for the subwoofer range, such as that
defined by the data points below. These points give a boost that is 6dB at 20Hz, dropping to 0dB
at 80Hz and above. The boost remains flat at 6dB below 20Hz. A more
elaborate curve might include a roll-off at high frequencies (if full range equalisation were being
applied). For more on this topic see the discussion in the BFD forum here:
http://www.nextlevelav.com/forum/showthread.php?t=800
House Curve data
20 6.0
80 0.0
When a house curve has been loaded the
symbol is displayed
next to the Target trace value in the Filter Adjustment graph group. The name of the file can be
displayed via the Calibration/Data Files entry in the View menu.
- Remove House Curve
- Remove the House Curve (resets the target response to a flat line at the
Target Level).
- Export Channel Impulse Response as WAV
- Export the impulse response for the current channel in WAV
format, written as mono signed PCM data, with the impulse response
starting 2 samples into the file (the first 2 samples are zero). The response length is 128k samples (131,072).
The dialog provides options to choose the number of bits per sample and to
select whether or not to normalise the response so that the peak value is
unity (0dBFS). 32-bit sample width is recommended if the application using the data
can accept this, particularly if the response is not normalised.
- Export Channel Filter Impulse Response as WAV
- Export the impulse response of the filters for the current channel in WAV
format, written as mono signed PCM data, with the response starting
1 second into the file (preceding samples are all zero). The response length is
128k samples (131,072).
The dialog provides options to choose the number of bits per sample and to
select whether or not to normalise the response so that the peak value is
unity (0dBFS). 32-bit sample width is recommended if the application using the data
can accept this, particularly if the response is not normalised.
- Export Channel Filter Settings as text
- Export EQ filter settings for the current channel in a plain text format.
The file includes the speaker setting and target level for the channel.
This file is a convenience format only, the Wizard cannot load filter
settings from text files - use the .req format to save and reload
settings. The path to the file is remembered for the next time the
dialogue appears. An example of the format is shown below.
Filter Settings file
Room EQ V3.26
Dated: 14-Dec-2005 16:24:33
Notes:An example of filter settings export
Equaliser: FBQ2496
Left
Bass limited 80Hz
Target level: 75.0dB
Filter 1: ON PEQ Fc 129.1Hz Gain -18.0dB BW Oct 0.167
Filter 2: ON PEQ Fc 36.4Hz Gain -13.5dB BW Oct 0.250
Filter 3: ON PEQ Fc 99.1Hz Gain -4.5dB BW Oct 0.033
- Export Channel Measured Data as text
- Export the measured data for the current channel as a text file.
A note can be entered that is displayed when the data set is next loaded.
The file includes the speaker setting, target level and measurement
settings for the channel. These text files can be re-loaded using
Import Measured Data. The path to the file is remembered for the next
time the dialogue appears. An example of the format is shown below.
SPL measurement data saved by Room EQ Wizard V3.26
Source: Realtek AC97 Audio, LINE_IN, Right channel, volume: 0.375
Format: 48000Hz sampling, Log Swept Sine, 10ms pre-impulse, 500ms post-impulse
using soundcard cal file D:\RoomEQ_Wizard\test files\Realtek48k.cal
Dated: 05-Dec-2005 22:17:35
Wizard Settings:
Tracking: On
C-weighting compensation: Off
Measurement level: -9.0 dBFS
Target level: 75.0 dB
Note: An example of measured data export
Channel: Left, Bass limited 130Hz
10 24.09
11 14.03
12 20.83
13 23.91
14 30.94
15 32.99
16 31.76
- Export Channel Impulse Response as text
- Export the impulse response data for the current channel as a text file.
A note can be entered that is displayed when the data set is next loaded.
The file includes the speaker setting, target level and measurement
settings for the channel. The path to the file is remembered for the next
time the dialogue appears. An example of the format is shown below.
Impulse Response data saved by Room EQ Wizard V3.26
Source: Realtek AC97 Audio, LINE_IN, Right channel, volume: 0.375
Dated: 05-Dec-2005 22:17:35
Channel: Left, Bass limited 130Hz
Measurement level: -9.0 dBFS
Response measured over: 10.0 to 20,000.0Hz
Peak value: 0.048474423587322235 at index 48000
Response length: 131072 samples
Sample interval: 2.0833333333333333E-5 seconds
Start time: -1.0 seconds
-1.1968059E-6
-4.963369E-6
1.1610139E-6
5.567701E-6
5.0363514E-7
-9.497037E-7
-1.2131918E-6
7.230116E-7