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audio - How do I downsample a .wav file in C and apply ...
https://stackoverflow.com/questions/28991364/how-do-i-downsample-a-wav-file-in-c-and-apply-bandpass-filter
Separate the code that deals with the specifics of .wav files from the specifics of working with audio samples. There are lots of how-tos on the Web for reading and writing .WAV files, especially PCM samples. Once you have your samples in memory, downsampling is trivial. You literally take every _n_th sample and throw away the rest.
Upsampling and Downsampling - Stanford University
https://ccrma.stanford.edu/~jos/JFB/JFB_2up.pdf
(OLA hop size = FBS downsampling factor = N). •Advanced audio compression algorithms (“perceptual audio coding”) are based on critically sampled filter banks, for obvious reasons. •Important Point: We normally do not require critical sampling for audio analysis, effects, and music 19 applications. We normally only need it when
Q. What’s the best way to downsample? - Sound on Sound
https://www.soundonsound.com/sound-advice/q-whats-best-way-downsample
I want to ask what method you consider to be the best for downsampling. I have started working at 24-bit and 96kHz and am noticing the benefits in quality, but I’m confused about the best method for getting back to CD quality (16-bit, 44.1kHz). I have no problem understanding dithering 24-bit audio to 16-bit, but am less clear about downsampling.
Downsampling, Upsampling, and Reconstruction
https://cppsim.com/BasicCommLectures/lec10.pdf
M.H. Perrott©2007 Downsampling, Upsampling, and Reconstruction, Slide 11 Upsampler • Consists of two operations – Add N-1zero samples between every sample of the input • Effectively scales time axis by factor N – Filter the resulting sequence, u p[n], in order to create a smoothlyvarying set of sequence samples • Proper choice of the filter leads to …
c - Resampling a sound sample, what filter do I use ...
https://stackoverflow.com/questions/4393545/resampling-a-sound-sample-what-filter-do-i-use
Here's a Windowed Sinc interpolating low-pass filter in Basic, that should be trivial to convert into C. If you want to use IIR filtering, here's the canonical Cookbook for biquad IIR filters. If you want the best explanation of audio resampling theory, here's Stanford CCRMA's Resampling page.
c# - How can I resample wav file - Stack Overflow
https://stackoverflow.com/questions/7995470/how-can-i-resample-wav-file
Windows API (one of) to resample audio is Audio Resampler DSP. This transform class is pretty straightforward to set up input and output types, then push input data and pull output. Another task you would possible deal additionally with is reading from file and writing into a new file (you did not specify if it is actually needed in your ...
Downsample Audio with SoX | Maxie’s Notes
https://notes.maxie.xyz/audio/downsample-audio-with-sox.html
When downsampling a 176 kHz (176.4 kHz, actually) audio, the target sampling rate should be 88.2 kHz or 44.1 kHz (2:1 and 4:1 decimation, respectively). # Downsample with SoX. Downsampling with sox is relatively easy, you just have to use the rate effect. You also have to set the phase and the quality. The SoX FAQ states:
How to Resample Audio with NAudio - Mark Heath
https://www.markheath.net/post/how-to-resample-audio-with-naudio
Or if you’re playing audio through an API like WASAPI, which doesn’t resample for you, you need to do this yourself (actually WasapiOut in NAudio does include a resampling step on your behalf if needed). There are also some gotchas you need to be aware of when resampling. In particular there is the danger of “aliasing”.
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