Continuous Time Digital Signal Processing and Signal Reconstruction

Continuous time systems disruptive signal processing and accurate real time signal reconstruction

“…(2) As shown in Figure 5, level crossing continuous time sampling fails linearity's superposition test [13]. Level crossing sampling signals must be interpolated [13] before any signal processing steps.…”

“…(2) As shown in Figure 5, level crossing continuous time sampling fails linearity's superposition test [13]. Level crossing sampling signals must be interpolated [13] before any signal processing steps. Tsividis et al [3]- [4] used the simplest form of interpolation for level crossing continuous time signal reconstruction -the asynchronous zero order hold (AZOH) (an asynchronous version of the zero-order hold).…”

“…This is not true for processing of level crossing samples. Level crossing sampling is inherently nonlinear [13], and the reconstruction operator is not time-invariant. While signal reconstruction in DT systems can be ignored throughout most of the processing chain and relegated to the digital-to-analog converter (DAC), it remains a crucial concern to all aspects of CT system design.…”

“…The most prevalent approach is to partially reconstruct the input signal by applying an asynchronous zero-order-hold (AZOH) to the samples. This type of signal [13], referred to here as level crossing delta (LCD), is fully defined at all times, and can be processed by various asynchronous techniques [3], [16]- [21]. But these piecewise constant signals are not bandlimited, and they have multiple undesirable in-band harmonics [5], [17], [22].…”

“…CT-DSP has a cost for the performance benefits. It is nonlinear and signal reconstruction is required before any signal processing [13]. In this paper, a real-time reconstruction technique for level crossing sampling signals is presented.…”