Keyboard latch for electronic organ

In an electronic musical instrument having a keyboard including a plurality of keys, a clock signal source developing a scan clock signal and means responsive to said scan clock signal for repetitively scanning said keyboard for repetitively developing a sequence of serial data pulses time encoded for defining depressed keys of said keyboard, the improvement comprising:

• means generating a beginning of scan pulse defining the beginning of each of said repetitive keyboard scans;
• means responsive to said clock signal for delaying and inverting each of said sequences of data pulses by the time required for said scanning means to complete one scan of said keyboard;
• means responsive to said scanning means and to said means for delaying and inverting for developing a control signal in response to each scan of said keyboard during which at least one key is depressed that was not depressed during the scan occurring immediately prior thereto;
• and
• means responsive to each of said control signals and to the beginning of scan pulse generated immediately subsequent thereof for continuously developing an output signal representing the keys depressed during the scan of the keyboard resulting in the development of the respective one of said control signals and for maintaining said output signal until another key is depressed which was not depressed during the scan of the keyboard resulting in the development of said respective one of said control signals.