Saturday, 11/02/2024

Jconv is a Convolution Engine for JACK using FFT-based partitioned convolution with multiple partition sizes. It's a command line version of what will be the core of Aella, but without the special reverb feautures, preset management, reverb envelope editing etc. that Aella will have. Jconv uses a configurable smallest partition size at the start of the impulse response, and longer ones further on. This way you can have long impulse responses _and_ minimal or even zero delay at a reasonable CPU load. This would be impossible using just one partition size. Processing for partition sizes larger than Jack's period size is delegated to up to five threads running at real-time priorities just below that of Jack's audio threads. CPU load generated in such threads will _not_ show up in Jack's DSP load figures. If you set the smallest partition size equal to JACK's period, there will be zero processing delay. Otherwise the processing delay is 2 * smallest_partition - period_size. Jconv will do any convolution matrix up to 64 inputs by 64 outputs, as long as your CPU can handle it. It doesn't waste any memory or CPU cycles on empty cells in the matrix, nor on empty parts of an impulse response. Maximum length for each convolution is 30 seconds. Jconv can easily generate 100% CPU load at real-time priority. This will in most cases not stop audio processing, as the load will be at lower priority, but it will lock up everything running at normal priorities such as your terminals or desktop. Don't panic - jconv will detect the situation and bail out after a second or so. Author: Fons Adriaensen

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