Display SPL?
J.Luszczek
Posts: 159
I would like to display SPL levels on the control pages- either from a live microphone on one of the inputs, or through 232 strings coming from a Gold Line rack mount SPL meter that has RS232 output.
Gold Line sells a big LCD sign which displays SPL readings directly from the rack unit through RS232 . http://www.gold-line.com/splsign.htm
I used it on a job before, but I could use something less obtrusive.
Would there be a way to parse the RS232 data from Gold Line and display it on a control page in London?
If not, is there a way to offset the RMS meter to display a range from let's say 40dB to 125dB as opposed to the default -80dB to +40dB?
Gold Line sells a big LCD sign which displays SPL readings directly from the rack unit through RS232 . http://www.gold-line.com/splsign.htm
I used it on a job before, but I could use something less obtrusive.
Would there be a way to parse the RS232 data from Gold Line and display it on a control page in London?
If not, is there a way to offset the RMS meter to display a range from let's say 40dB to 125dB as opposed to the default -80dB to +40dB?
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Comments
There is no way to recieve and do anything with a third party control, you will need to use a third party system such as AMX for this. You can set the AMX controller up so that when it recieves a string from the SPL controller, it sends a string to the soundweb
The only other way you can view the SPL readout is if the GUI the SPL meter uses is supported by a web browser.Then you can set up an embedded webpage in London Architect.
Using the SLC1 unit, the relay out can be wired to a soundweb control port. this can then be used to call a preset or show a SPL level has been reached.
With a bit of set up, you can use a meter trigger to indicate a SPL level has been reached - so if you are reading 100db in the room from your measurement position, move the meter threshold down so the trigger light comes on. Then use that to indicate 100dbSPL.
It's possible to parse RS232 using asp or java and embed it in a http page, but I don't have the budget to hire a programmer to do it.
I will just buy the big LCD sign again and hang it where the hotel's managers can see it.
A soft link between a meter and gain indicator should do it- if the indicator had a freely definable range.
First, put the meter on a custom control panel. Then go to properties:
1) turn on User Value
2) set User Value Minimum to 60
3) set User Value Maximum to 110
4) click on Tick Positions, delete the old ones, and create new ones
5) under Style change Steps in Stage 1, 2, etc so that they add up to 51
Finally, just tweak the gain so that it matches your favorite SPL meter. Depending on the mic you use, you'll probably need to cheat by changing the User Value Minimum and Maximum. I would set the gain so that the Maximum is reading correctly and then change the value of the Minimum to whatever it actually is.
Dan
If you drop that modified meter on a numeric gain display the numbers on the display will show the absolute values, not the user scale/values you just created.
I would like to have actual numbers displayed in big red font on control pages mimicking the display of an SPL meter.
The job I'm working on right now is a hotel with outdoor pool/beach area and very strict local noise ordnance.
One of the system controllers is a tablet PC on wifi. It would be really cool if I could put SPL readout right on the control page associated with the outdoor zones.
I know I can place the big LCD sign somewhere outside and also sell them a handheld meter, but that's just one more thing to carry around and worry about batteries etc.
Dan