AudioKitUI | User Interfaces for AudioKit | Audio Utils library
kandi X-RAY | AudioKitUI Summary
kandi X-RAY | AudioKitUI Summary
Waveform plots and controls that can be used to jump start your AudioKit-powered app.
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QUESTION
I would like to be able to use one of AudioKitUI
's components FFTView
in conjunction with the input node to visually show the node input as well as perform Speech Recognition.
Per BaseTap.swift
notes about taps (line 65):
ANSWER
Answered 2021-Jun-19 at 05:35Just put a series of mixers inline and do what you need to each of them. Tap each one a maximum of once.
QUESTION
I'm seeing an issue when using an AKFrequencyTracker that when connected to an audio interface I see erroneous high frequency readings around 47kHz while playing a connected guitar. I don't have to play anything and I see the high frequencies. The amplitude seems to track to what it should be based on the input from the interface.
I've been able to reproduce this in the microphone input playground as well. Here is the slightly modified version.
...ANSWER
Answered 2020-Sep-07 at 03:05I'm not particularly familiar with AudioKit, but according to your output, the sample rate is 48kHz. The highest frequency that you can correctly sample with that is the Nyquist frequency, f/2. Any values you're reading higher than 24kHz are not meaningful.
Above f/2 (24kHz), you're going to start seeing aliases. These are mirror copies of previous values you've seen. They don't have any real meaning. The FFT generates them because of how it's computed.
Human hearing falls off very rapidly as you approach 20kHz. There's not a lot of value in recording frequencies above that if the goal is human hearing. That's what leads us to the common sampling frequencies, 44.1kHz and 48kHz. Their Nyquist frequencies are 22.05kHz (higher than most people's range) and 24kHz (all but the very best human range). 16kHz is also popular because it's Nyquist frequency (8kHz) comfortably holds the range of human speech and the most sensitive range of human hearing.
BTW, I have an 2i2 myself. Nice little box, and it allows sampling up to 192kHz (96kHz Nyquist), which is incredibly outside the range of human hearing and there's no reason to do a final mix with that IMO. But I have heard it is useful as a starting point for mixing to avoid losing data early in the cycle, even if you later downsample to 44.1. I don't know if that's really true or just marketing, but just a note for when you see numbers much higher than 48kHz.
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