When using dynamic resampling of a noisy sine (e.g. with 977 Hz) from e.g. 48000 Hz samplerate to 480001 samplerate, a frequency bounce of the resulting sine is visible which exceeds the actual frequency adaption.
Tested with
SpeexDSP 1.2.0
quality settings 3 and 10
This issue doesn't occur with a generated sine of the same frequency. This issue isn't visible with other resamplers as soxr or secret-rabbit-code (src) aka libsamplerate.
A sample code including WAV header handling is included. It can be used to generate a sine or use an input file (also attached). The resulting fundamental frequencies over time are attached for the original input and output signals. A similar plot can be achieved by using e.g. SonicVisualizer ('Layer' -> 'Add Peak Frequency Spectrogram' with max. Window size and a frequency zoom from 976 to 978 Hz).
When using dynamic resampling of a noisy sine (e.g. with 977 Hz) from e.g. 48000 Hz samplerate to 480001 samplerate, a frequency bounce of the resulting sine is visible which exceeds the actual frequency adaption.
Tested with
This issue doesn't occur with a generated sine of the same frequency. This issue isn't visible with other resamplers as soxr or secret-rabbit-code (src) aka libsamplerate.
A sample code including WAV header handling is included. It can be used to generate a sine or use an input file (also attached). The resulting fundamental frequencies over time are attached for the original input and output signals. A similar plot can be achieved by using e.g. SonicVisualizer ('Layer' -> 'Add Peak Frequency Spectrogram' with max. Window size and a frequency zoom from 976 to 978 Hz).
Attachments: