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frequencies
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frequencies [2015/12/30 16:31] schultz |
frequencies [2015/12/30 17:02] (current) schultz |
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| The transmitter is creating the square waves by making an output pin high or low. The transition needs to be aligned to the 100 kHz timing clock. Therefore, there are a discrete set of allowable player frequencies. It takes two clock period to make a square wave. (One to turn a pin from low to high and one to turn it from high to low.) | The transmitter is creating the square waves by making an output pin high or low. The transition needs to be aligned to the 100 kHz timing clock. Therefore, there are a discrete set of allowable player frequencies. It takes two clock period to make a square wave. (One to turn a pin from low to high and one to turn it from high to low.) | ||
| - | This plot shows the allowable square-wave frequencies. We want the frequencies that we use to be uniformly spread out over the frequency band (1 kHz - 5 kHz). We decide to use the frequencies of 1111, 1389, 1724, 2000, 2273, 2632, 2941, 3333, 3571, and 3846. These frequencies are shown on the plot as the red dots. | + | This plot shows the allowable square-wave frequencies. We want the frequencies that we use to be uniformly spread out over the frequency band (1 kHz - 5 kHz). We decide to use the frequencies of 1471, 1724, 2000, 2273, 2632, 2941, 3333, 3571, 3846, and 4167. These frequencies are shown on the plot as the red dots. |
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| - | {{ :f_players.jpg |}} | + | |
| + | {{:frequencies.jpg|}} | ||
frequencies.1451518269.txt.gz · Last modified: 2015/12/30 16:31 by schultz
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