Best Free Frequency Analyzer App For Iphone
Nancie Fazzari
Spectrum Analyzer for iOS is a powerful real-time audio analysis app. Designed with musicians and recording engineers in mind, it can also be used by anyone interested in the world of sound. Ideal for room tuning or speaker tuning, the app enables portable, precision audio measurement and visualization. The videos below demonstrate three of the included modules - Octave RTA, FFT Plot, and Spectrograph. A Test Tone Generator is also available.
Octave RTA Splits the audible range into frequency bands. It supports ISO Octave bands from Full to 1/6 Octave. Two graphics modes are supported: Classic mode, where bands are drawn as simple bars; and Modern mode, where the whole spectrum is represented by a colorful analog graph (continuous visible light spectrum from red to violet). Other configuration options include: FFT Size, Time Averaging/Decay Mode, and Peak Tracking.
FFT module plots real-time raw spectrum graph. It is useful for detailed analysis and isolating particular frequencies. Options include FFT Size, Averaging Mode, Logarithmic or Linear Frequency Scale, and FFT Window function (Hamming, Blackman, or Rectangular). Again, Cursors, Peak Tracking, and dB offset are supported, as well as input channel selection.
Spectrograph module plots frequency over time spectrograms of surrounding sounds, music, etc. It can be used to reveal images "hidden" in sound. Options include Decade or Linear Scale, Speed, and Gain adjustment. Several Color Palettes are available suiting different applications.
Choosing the right FFT Size and Time Averaging is always a trade-off between time and frequency resolution. The more accurate the frequency resolution (larger FFT size), the less accurate the time resolution and vice versa.
For rapidly changing material such as music and speech, FFT size of 2048 or 4096 and averaging set to Fast or Medium will do fine.
For test signals, such as pink noise and constant frequency tones, a larger FFT (8192 or 16384) with Slow or Infinite averaging works best. Larger FFT Size also provides better low-end frequency representation.
Audio input may be acquired via the built-in microphone or an external measurement microphone. For best results we recommend using a calibrated measurement microphone connected via USB audio interface or iPhone dock connector. This allows for high precision and flat frequency response, as well as for stereo input.
The active audio device is shown in the middle of the top status bar. Tap to open the Audio Settings dialog.
Keep in mind, there are other software and hardware solutions for RTA sound frequency analyzers, but at $300+ the cost is significantly more. On the plus side, they are more accurate than the iPhone app, but with a little tweaking, the iPhone app will work just fine.
Before you start analyzing the sound at your church, I recommend going to another church or venue where you like the overall sound. Then, pull out your iPhone and analyze the sound. This will give you an idea of what you need work towards.
In my opinion, Church on the Move in Tulsa has the best sound of any venue I have ever been in. So, I went to one of their events, pulled out my iPhone during worship and examined what was going on. I also took a few screen shots to help me remember (see below).
The two screen shots were taken during two different songs. The main thing to notice is where the higher frequencies begin to fall of, which would explain why their sound is so warm and powerful, but still plenty of clarity.
In our current venue, there are lots of problems. The room is long and narrow, we have concrete floors, plastic chairs and hardly any sound absorbing surfaces. We have since installed a significant amount of sound absorbing panels, which helped tremendously, but a good amount of EQ is still necessary to achieve a good sound.
It took me about 3 weeks to get the sound I wanted, but it was well worth the effort. Now, we can run the vocals where they need to be without fear of feedback. And, our sound is full of energy, fills the room, but no longer hurts your ears.
Tuning the room is a one time thing, yes. But I often find myself bringing out the frequency analyzer app during rehears to help diagnose problem areas. For example, I will have the vocal sing by themselves so I can find what part of the voice is not working well with the room. Then, use EQ to fix the problem.
Why iPhone?
I don't understand why the manufacturers design everything to work with apple products and then MAYBE later add Android or windows apps?
I personally don't like apple products!
And not everyone can afford iPhones and or iPads.
The manufacturers need to take this into consideration when installing/programing. software
Great resources here! I was wondering if you could help me with the new version of this app. There's no gear anymore, but all the settings are on the bottom. It gives an "octave" option with 1/3, 1/6, and full as the options, an FFT size, at 2048, 4096, 8192, and 16384. I believe I have the other right options set. Average is set to medium as opposed to slow, infinite, and fast and I have my graph set to bars instead of line, and my peaks are set on hold as opposed to off and auto. Also, I guess I just need to know what frequency range instruments and vocals need to be between so I can cut the necessary frequencies on that specific channel. Thanks for any help you can give!
Hey Jonathan. For the 'octave', I'd use the 1/6 option so you can really dial in the frequency that is sticking out above the rest. I am unsure on the FFT size...this is a new feature that I have never heard of.
There really is no specific 'range' you are looking for. This app should simply be used to help your ear learn how to diagnose frequencies that stick out above the rest. So, when you know something doesn't sound quite right, pull out this app and find where the peaking frequencies are and use that as a starting point for setting your EQ.
To follow up on that question that Barry asked a couple of years ago, do digital boards have an EQ for the main outs or something? I am working with an analog board and can only adjust channel EQ. If I find troublesome frequencies, is it a matter of finding out what instruments/vocals may be in that frequency and trying to work with the individual channels? Feel like I am missing something obvious here.
Hey Dan - thanks for the comment. Yes, digital boards have EQ for the main output, which is where the 'overall EQ' can be dialed in. On an analog mixer, you'll need an external graphic equalizer connected to your Main Out's 'Insert' to control EQ for the main mix.
This app is currently listed as not operating in iOS 11. It has not been updated in 5yrs. Can you confirm that we can still operate this app? Can you recommend an alternative which is being actively updated?
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In North America, the 2.4 GHz band extends from 2,401 MHz to 2,483 MHz, and it's divided into 11 channels, each spaced 5 MHz apart from one another. Because each channel is 20 MHz wide, adjacent channels overlap, which can lead to signal interference.
As a result, it's typically recommended to use channels 1, 6, and 11, as these are the only non-overlapping channels in the band. The 5 GHz band is divided into 24 non-overlapping channels, each with a bandwidth of 20 MHz, giving you more options for avoiding interference.
The newest advancement in WiFi technology is IEEE 802.11be, known as WiFi 7, operates in the 2.4, 5, and 6 GHz frequency bands, offering Extremely High Throughput (EHT) and catering to both indoor and outdoor WLAN operations.
Armed with this knowledge, you can engage in effective WiFi channel planning. This process involves selecting a channel that minimizes interference and maximizes performance based on your specific environment and usage patterns.
NetSpot for iOS provides a unique combination of a WiFi heatmapper and a speed test tool. As a result, iOS users can take advantage of it to both optimize network coverage and assess network performance.
The WiFi speed test feature allows you to consistently monitor your network's performance. It automatically connects to the nearest server and performs ongoing speed tests. This lets you move around your space to gauge how location changes impact your WiFi's download speed, upload speed, and latency.
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The biggest downside is that it can't map signal strength without an external device called WiFiMan Wizard. Despite this, Ubiquiti WiFiman still holds its own as a powerful wifi channel analyzer app for iPhone and iPad.
Survey mode, on the other hand, allows users to create detailed WiFi surveys. By overlaying WiFi signal strength data onto a map of your area, you can visually identify signal weaknesses and interference sources, making it easier to optimize your network's coverage and performance.
Furthermore, NetSpot for desktop introduces Planning mode, a feature designed for planning and deploying new WiFi networks. It assists in estimating the optimal number and placement of access points for future networks to guarantee optimal coverage and performance.
"Spectrum Analyzer for iOS is a powerful real-time audio analysis app. Designed with musicians and recording engineers in mind, it can also be used by anyone interested in the world of sound. Ideal for room tuning or speaker tuning, the app enables portable, precision audio measurement and visualization."
On a second thought, if you know what's the source of some noise you want to get rid of and use the app just to find the exact frequency, (placing the phone right next to the culprit) it could be usefull.
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