Importing Measurement Data

REW can import measurement data from other applications, in particular the deservedly popular ETF5 measurement system (http://www.acoustisoft.com). Most ETF5 export formats are supported, along with generic comma, space or TAB-delimited text files. Note that when making measurements with ETF5 it is best to use use the calibrated SPL option to allow level comparisons between channels.

ETF *.pcm Format Impulse Responses

Full range ETF measurements allow the impulse response to be exported in a .pcm raw data format, using the File -> Write Impulse As *.pcm option. Use REW's File - Import Impulse Response command to load these files. Importing the impulse response allows the Wizard's Low Frequency Spectral Decay and Waterfall plots to be generated from the data (this is not possible when importing frequency response text files). REW loads the first 128k samples from the file (approx 2.73s at 48k sampling).

Wave Format Impulse Responses

The File - Import Impulse Response command can also be used to load impulse responses that have been saved as .wav format. REW loads the first 128k samples from the file (approx 2.73s at 48k sampling).

Frequency Response Text Files

The File - Import Measurement command accepts text files in the following formats:

Comma-delimited File Format

Here is an example of a valid format for comma-delimited data:

            SPL measurements acquired by Room EQ Wizard V3.08
            Source: D:\RoomEQ_Wizard\test files\testfile.txt
            Format: Comma delimited data
            Dated: 05-Mar-2005 17:53:56
            Channel: Left, Bass limited 80Hz

            20.0, 65.01
            21.0, 65.77
            22.0, 67.50
            23.0, 67.93
            24.0, 68.22
            25.0, 67.88
            26.0, 67.92
            27.0, 68.31, this line has a comment
            28.0, 69.14
            29.0, 69.16
            30.0, 69.29
        

If comma is used as the decimal delimiter in your locale it is best for clarity to use TAB or space as the separator.

Space-delimited File Format

Here is some data in space-delimited format

            SPL measurements acquired by Room EQ Wizard V3.21
            Source: D:\RoomEQ_Wizard\test files\testfilespace.txt
            Format: Space delimited data
            Dated: 27-May-2005 13:03:26
            Channel: Left, Bass limited 80Hz

            20.0 65.01
            21.0 65.77
            22.0 67.50
            23.0 67.93
            24.0 68.22
            25.0 67.88
            26.0 67.92
            27.0 68.31 this line has a comment
            28.0 69.14
            29.0   69.16  multiple spaces are OK
            30.0 69.29
        

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