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Bedrock SM50 operating manual
© Embedded Acoustics BV, 2015
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Instructions on how to perform firmware updates is given in the section 8 of this manual.
In order to process and analyze the results further, copy all results files from the SM50 to a
local folder on your PC.
The measurement files are saved in .csv format. These files can be imported in almost all
worksheet applications, such as Microsoft Excel. This will allow you to analyse the data
further, and pre-process the data for the purpose of reporting.
Even if you remove the measurements, the SM50 will continue the meas-
urement numbering series where it left off. If you wish to reset the measure-
ment number (restarting at number 1), you need to remove all .csv files. as
well as the file _INDEX.DAT.
Note that the .csv format is not a formal standard; differences in interpretation of the .csv
file format exist even between different versions of MS Excel. This results in the fact that
the output files from the SM50 may be imported very easily in some versions of Excel, and
may require more attention in other versions of Excel. If you are having problems import-
ing the output files into Excel, import the files as “text files” rather than .csv. It may help to
rename the files to another extension than .csv (e.g. .txt).
Stored audio recordings are found in the same folders as the .csv files with measurement
data. The following applies to stored audio recordings:
•
Audio is stored in .wav format (single-channel 44.1 kHz floating point
PCM), which is easily read by many applications
•
The audio is normalized to exactly 150.0 dB at full scale. Different audio
players may show the value of full scale differently; often full scale is nor-
malized to a value of 1.
•
Note that the level calibrations are implicitly preserved by this normaliza-
tion relative to full scale. This allows for easy further processing by acoustic
analysis software.
•
Stored audio files take up considerable amounts of storage space (about
700 MB per hour). This fills up the storage capacity of the device relatively
quickly.
•
On a related note, keep in mind that downloading large amounts of re-
corded audio data to a PC over the USB2.0 interface will take some time.