Open Sound Meter

A few days ago in the FB group Open Sound Meter Practitioners, my old post from 2018 was brought up. It was almost 6 years ago! Since this time tens of thousands of engineers around the world started to use OpenSoundMeter. I'd like today to clarify a little one of the basic ideas behind the application. There is no difference between measurement data made some time ago and current active measurement. It's always measurement data, made somewhen, a few milliseconds ago or a few years, it doesn't matter. That means that any operation, that you can apply on any measurement you can apply on all types of data. For example, let's look at the math source's summation function. You can check how datasets will align together. My favorite usage of this one is to see a summation of the current active measurement with a stored one. In a classic sub-top align game you can change settings in your DSP for the sub channel and see in real-time how it will combine with the top. If you are a fan of the silent tuning approach, you can do it for already stored data. Furthermore, the math source is also a source and can be used for another math operation. When you do multimicrophone measurements, you can create an average and use it in another operation to check the virtual summation of it with previously stored data or the difference with a target trace, you use. Another tool I use for averaging is to see also min and max values of the averaging source. When we speak about some stored source it doesn't mean that this data should come only from the current project, you can import data from another project or even created by another software. The import function supports all the common standards. I usually use the export function in prediction software (if possible) and import predicted data in the project to see the difference. Imported data is not always in the required window size for usage in the current project and normally contains only frequency or time domain. In Open Sound Meter both domains are always present in the source. With the help of a windowing source, it's possible to convert any incoming data to the needed one and also restore a missed domain. Additionally, there is a filter source where you can set up a filter. It allows you to observe it (strongly recommended btw) and apply it to another source. To emulate a 10-band eq you can use the math source with apply operation and count 10. Now apply this created eq to some measurement of the speaker and then again use virtual summation to see the final result. There are unlimited ways to use operations in Open Sound Meter and you can go as far as you want. It is even possible to create an FIR filter in the application, it's probably not the easiest task for now, but I'm going to finalize this functionality in an easy-to-use source right in the application.

Windowing — one of the new features in Open Sound Meter v1.3 It allows you to "rewindow", which means applying another window on the measurement. It can be imported data, previously created measurements, or even currently active measurements. Let's look at an example. 1) The first measurement is an array containing 13 Meyer Sound Melodies. Its transfer function contains the first arrival and reflections. You can easily see that through in time and frequency domains. 2) With a Windowing source, you can isolate and investigate only the first arrival. Here, using only 45ms of the original time window, a new transfer function was calculated with an exponential window function. 3) To check how close is a windowed result to the original source, we can measure one element on the floor and compare the results. 4) To double check, you can export impulse response from MappXT and import it to Open Sound Meter. 5) Let's use again the windowing source to calculate the frequency response from imported IR. 6) Finally, we can use a new diff operation to analyse how close the results are. If you want to support feature development, you can do so with PayPal: https://lnkd.in/dbP8EpQb iPad version: https://lnkd.in/gWYXgEs Desktop versions: https://lnkd.in/dDZ6zh7F

It's here, the new version 1.3! • Leq measurements were added for 1, 5, 15, and 60 minutes. • M-Noise replaced with a Music-Noise for the updated AES75-2023 standard. Now available for 48 and 96kHz • New windowing source allows you to rewindow any already taken measurement with a new window or explore recorded IR • Allpass and peak filters added in the filter source • Filters on inputs in measurement (A, C and 1kHz notch) • THD+N measurement • Normalized impulse response • Exponential window function added • Difference function in math source • Swipe to the right gesture to temporarily hide the source from the list • Fixes and improvements If you want to support feature development, you can do so with PayPal: https://lnkd.in/dbP8EpQb iPad version: https://lnkd.in/gWYXgEs Desktop versions: https://lnkd.in/dDZ6zh7F "The opposite of war isn't peace... It's creation!" © La Vie Boheme. Rent musical.