Figure 9
From: Compression of high-density EMG signals for trapezius and gastrocnemius muscles
Comparison with literature results. Signal-to-noise ratio (SNR) in decibels (dB) as functions of contraction level (%MVC). Lossy-JPEG compression SNRs are shown for medial gastrocnemius signals in transversal (empty diamonds) and longitudinal (filled diamonds) arrangements, and for upper trapezius signals in transversal (empty circles) and longitudinal (filled circles) arrangements. Literature results (stars) are given for biceps brachii signals, using the following compression methods: a) algebraic-code excited linear prediction (ACELP) for an 87.3% FSR, b) independent coding (IC) for an 89.6% FSR, c) spectral prediction (SP) for a 91.0%FSR, and d) spatial and temporal codebook-excited linear prediction (STP) for a 91.0% FSR.