Knock Sensor Level ? Does it change on a rough road?

[svx_commuter]

The knock sensor is a vibration pick-up.
From what I understand the frequency of the "knock" is low.
Is this right?
Does the knock sensor also pick-up road vibration from a rough road?
Does the timing retard on a rough road from the knock sensor reading?

Take care,

John

[Trevor]

The knock sensors are designed such that only a specific vibration/knock originating from the engine block will register a signal. A weight is incorporated within the sensor to achieve this end.

Road vibrations will most certainly not affect the sensor or ignition timing.