Timeline for How do software equalizers work?
Current License: CC BY-SA 4.0
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| Jul 23, 2020 at 20:20 | comment | added | Hilmar | Most often these days the file will come over the network. No need for an ADC but you still need to feed a DAC or Bluetooth transmitter at a fixed clockrate. Biquads are still quite popular in audio processing. Getting decent resolution at bass frequencies requires large FFT sizes which eats into memory budgets and adds a lot of latency. Biquads are much more efficient by all standard metrics | |
| Jul 23, 2020 at 18:36 | comment | added | GNA | @KevinSullivan Yes. The typical process of playing an audio file involves reading the data from storage e.g. an SD card, decoding the file format to the audio streams and then postprocessing this audio stream using digital equalizers, and all sorts of filters before sending them out to the DAC which generates the analog signal. Many filters aren't implemented using biquad structures but instead the signal is fourier transformed, multiplied with the transfer function and transformed back to time domain. Modern processors provide special command sets to execute these calculations efficiently. | |
| S Jul 23, 2020 at 15:45 | history | suggested | CommunityBot | CC BY-SA 4.0 |
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| Jul 23, 2020 at 14:36 | review | Suggested edits | |||
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| Jul 23, 2020 at 12:09 | vote | accept | Kevin Sullivan | ||
| Jul 23, 2020 at 12:08 | comment | added | Kevin Sullivan | This really puts it in perspective, thank you! I never knew the ones in smart phones could run that fast. Side-note, do you know if they actually have to use an ADC? I started thinking about it, and if the phone has the audio file on it, couldn’t it be processed straight from memory without actually having to digitize it? A bit of a tangent, but just figured I would check if you knew? | |
| Jul 23, 2020 at 11:38 | history | answered | Hilmar | CC BY-SA 4.0 |