Event Handling Blocks

Event Handling Blocks#

Continuous to Event
Continuous to Event Block Image

Block converting an analog signal to an event signal. The blocks can be mathematically described as:

\[\begin{aligned} \delta &= H(x - d) \end{aligned}\]

where \(H\) is the Heaviside step function and \(d\) is the threshold parameter.

Input:

  • In (analog) – Input signal \(x\).

Output:

  • Out (boolean) – Output events signal \(\delta\).

Parameters:

  • Threshold – The threshold \(d\) of the event generation. Default value is 0.0.

Event to Continuous
Event to Continuous Block Image

Block converting an event signal to an analog signal. The blocks can be mathematically described as:

\[\begin{aligned} x &= g\delta \end{aligned}\]

where \(g\) is the gain parameter.

Input:

  • In (boolean) – Input events signal \(\delta\).

Output:

  • Out (analog) – Output signal \(x\).

Parameters:

  • Gain – The gain \(g\) of the event to continuous conversion. Default value is 1.0.

Event to Fixed Width Pulse
Event to Fixed Width Pulse Block Image

Block transforming incoming events into fixed width events. The blocks can be mathematically described as:

\[\begin{aligned} \delta_\text{out} &= H(T + t_{\delta_\text{in},i} - t)\delta_\text{in} \end{aligned}\]

where \(T\) is the fixed pulse width parameter, \(t_{\delta_\text{in},i}\) is the rising edge time of the incoming event and \(t\) is the current time.

Input:

  • In (boolean) – Input events signal \(\delta_\text{in}\).

Output:

  • Out (boolean) – Output events signal \(\delta_\text{out}\).

Parameters:

  • Pulse Width – The fixed width \(T\) of the output events in seconds. Default value is 0.0 seconds.

Event Loss
Event Loss Block Image

Block stochastically losing events according to a specified probability \(p\). The blocks can be mathematically described as:

\[\begin{aligned} \delta_\text{out} &= H(X[i] - p)\delta_\text{in} \end{aligned}\]

where \(p\) is the loss probability parameter and \(X[i]\) is a random number uniformly drawn in \([0, 1]\) for each incoming event.

Input:

  • In (boolean) – Input events signal \(\delta_\text{in}\).

Output:

  • Out (boolean) – Output events signal \(\delta_\text{out}\).

Parameters:

  • Loss Probability – Probability \(p\) of losing an event. Default value is 0.0.

  • Seed – The seed of the random number generator, a value of -1 specifies a random seed. Default value is -1.