SampleClk_Hz Parameter

The sample clock is a signal internal to the frame grabber, according to which pixels are sampled out of the video signal delivered by the camera..

When the camera is fitted with a pixel clock output, the frame grabber sampling clock exactly aligns itself to the camera pixel clock (digital synchronization scheme).

Otherwise, the frame grabber uses the analog synchronization scheme, and builds a sampling frequency of its own through a phase locking mechanism.

The camera pixel clock frequency can be declared with the parameter PixelClk_Hz. The sampling frequency is not necessarily equal to the pixel frequency.

The sampling clock is also used in the Gamma frame grabber to operate all timing dependant devices. This explains why the sampling clock is also referred to as the timing clock, or Tk.

The duration of the timing clock period is often called the TCU (Timing Clock Unit). This is a customary way to quantify duration items within the frame grabber.