System for the digital clamping of periodic, binary encoded signals
AssigneeRobert Bosch GmbH
InventorJurgen Heitmann
Life of this patent
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Abstract
A binary encoded signal which is to be clamped at a desired binary value is simultaneously applied to a digital subtractor and a digital adder. The digital subtractor subtracts the difference between the desired binary value and the value of the binary encoded signal. The resulting difference is applied to a storage flip-flop circuit having a switching pulse input which receives a periodic signal. The flip-flop transfers the last received difference until the periodic signal is received causing it to transfer the latest received difference. A binary adder adds the output of the storage flip-flop to the binary encoded signal. This results in a corrected clamped binary encoded signal.
Claims4
An apparatus for digitally clamping to a desired binary level binary encoded signals comprising:
- a. digital subtractor means for providing at its output the difference between the desired binary level and the binary encoded signal;
- b. storage flip-flop means responsive to a switching pulse input connected to the output of said subtractor means for transferring to its output said difference;
- and
- c. digital adding means for adding the output of said storage flip-flop means and the binary encoded signal thereby providing at its output a digitally clamped binary encoded signal.
An apparatus for digitally clamping a binary encoded PCM video signal having a horizontal blanking interval with a preset black level value comprising:
- a. a digital subtractor means for providing at its output the difference between the preset black level value and the binary encoded signal;
- b. storage flip-flop means including an input and an output responsive to the horizontal blanking interval of the binary encoded signal, the input of said storage flip-flop means being connected to the output of said digital subtractor for transferring the difference which occurs during the horizontal blanking interval;
- and
- c. digital adding means including inputs and an output for adding the output of said storage flip-flop means and and the binary encoded PCM video signal thereby providing at its output a digitally clamped binary encoded PCM video signal.
Dependencies are inferred from the claim text.