Fig. 5From: Motivational nondirective resonance breathing versus transcutaneous vagus nerve stimulation in the treatment of fibromyalgia: study protocol for a randomized controlled trialSignal processing pipeline for BarTek device. Real-time signal processing is based on a zero-crossing algorithm with further modifications. It is important to note that zero-crossing detection is based on a dynamically adjusted threshold. The basic signal processing algorithm consists of seven stepsBack to article page