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Step 4Waveforms
The two figures show the sort of waveforms that go into the sound card to make these displays possible.
The first one shows all seven frequencies output in sequence, and the first frequency again. It is the digit "1", the run of seven frequencies causing the vertical line, and the final one the right side of the base.
The second is showing how the gaps cause the blank spaces in the display. If a particular space in the dot matrix forming a character is empty, the corresponding frequency is not sent during its time slot, thus forming a character with light spots and empty space.
The first one shows all seven frequencies output in sequence, and the first frequency again. It is the digit "1", the run of seven frequencies causing the vertical line, and the final one the right side of the base.
The second is showing how the gaps cause the blank spaces in the display. If a particular space in the dot matrix forming a character is empty, the corresponding frequency is not sent during its time slot, thus forming a character with light spots and empty space.
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