Measure intensity of particular instrument sound - Page 1
Forum section: electronics / beginners

author: Vindhyachal.takniki
author_rank: Frequent Contributor
timestamp: August 24, 2018, 05:09:00 pm
content: 1. Need to measure the intensity or loudness of particular musical instrument like guitar and based on its loudness i have to send a signal to pc.More the sound more the signal value and lesser the sound lesser the value2. How to do it?3. One thing i thought of placing a mic and read by adc. But problem in that is i have to measure only that instrument noise and reject any other noise like of nearby humans or any other

author: Brumby
author_rank: Unknown
timestamp: August 24, 2018, 11:32:56 pm
content: Quote from: Vindhyachal.takniki on August 24, 2018, 05:09:00 pmBased on your very limited description, that is going to be a problem for practically anything you try (unless it's an electric guitar). Such ambient noise is why they have anechoic chambers isolated from the outside world.Perhaps if you were to offer a bit more information about what you are actually trying to achieve we could make some useful suggestions.

author: Vindhyachal.takniki
author_rank: Frequent Contributor
timestamp: August 27, 2018, 03:51:08 am
content: its sort of game in kids play. the louder the instrument played by kids, more the score like in bar graph display.its not only guitar, it may be any musical instrument, will be fixed first.so measure instrument loudness only.

author: Brumby
author_rank: Unknown
timestamp: August 27, 2018, 04:39:14 am
content: In my limited understanding, the physics of the situation have you at a distinct disadvantage.Any microphone picking up sound from the air is going to be subject to ambient noise pickup as well ... and if it's kids trying to play loud, that will be somewhat of a challenge. A contact microphone might be an option to consider as it will pick vibration up directly from the body of the instrument. Unfortunately, this isn't going to work too well with many instruments.The only idea that comes to mind that might work to some degree is to have a directional microphone such as the "shotgun" style. This would mean, though, that the player would need to keep themselves in a defined zone for their "music" to be picked up fully.If you want to try something like that, there are plenty of ideas available on the internet. Search for "DIY shotgun microphone" and see if any of them have appeal.

author: MasterT
author_rank: Frequent Contributor
timestamp: August 27, 2018, 06:33:38 am
content: Microcontroller + FFT analysis.https://www.youtube.com/watch?v=Ra4Yx8nkENs&feature=youtu.be

author: t1d
author_rank: Super Contributor
timestamp: August 28, 2018, 07:47:00 am
content: You might consider a device called a "Noise Gate." They are used to withhold ambient noise, just as you will need to do. You have heard one, in operation, and didn't even know it... Any time you are talking with a customer service type person, on the telephone. Listen closely and, as they speak, to initiate an open mic, you can hear the other CSR's yakking away... The sound must reach a preset volume, before the gate opens and the sound is processed.They are a common feature, on walkie talkies, too. Sometimes this setting is labeled something like "sensitivity."Google "VOX," too.If you are developing a game, where the winner is the kid that can withstand the loudest noise, you may want to rethink that. I was a sound engineer. You can do permanent ear damage, instantly. A kid with hearing loss, for a lifetime, would make a juicy lawsuit.