Tweesample

Tweesample is a digital signal processing concept used in audio and audio-visual workflows to reconstruct a signal by combining two simultaneous sampling streams. The approach aims to improve reconstruction quality and reduce artifacts by leveraging information from two interleaved sampling paths rather than relying on a single sample stream.

In a typical implementation, an input signal is independently resampled at two nearby rates using separate interpolation filters. The two resulting streams are time-aligned and blended through weighted averaging or adaptive crossfading to produce a final output sequence. The technique can be used in sample-rate conversion, time-stretching, and high-frequency content preservation, where conventional single-rate resampling may introduce aliasing or transient smear.

The term’s use is not standardized; it appears mainly in experimental DSP discussions and some plugin documentation as a method to describe dual-path sampling strategies. It is not widely adopted as a formal standard, and there is no universal specification. Implementations vary in their choice of dual rates, filters, and fusion strategy, as well as in the resulting latency.

Because tweesampling is more computationally intensive than conventional resampling, practical use often trades off latency and CPU load against fidelity gains. It is most commonly found in research prototypes, experimental plugins, or specialized post-production workflows.

See also: resampling, anti-aliasing, polyphase interpolation, audio plugins.