| DDS (Direct Digital Synthesizer) |
| DDS generates
from D/A converter with saved digital data in semiconductor memory. Varying the saved data can generate sine, triangle or arbitrary waveforms. Changing the one period data reading speed can vary the output frequency. |
| ¡@ |
| Modulation |
| The words AM (Amplitude Modulation), FM (Frequency Modulation, PM (Phase Modulation) are widely well known. |
| PWM: Pulse Width Modulation |
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Pulse duty ratio is varied by modulation waveform. |
| FSK: Frequency Shift Keying |
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Frequency skips to specified frequency by 1/0 status of one bit digital signal. |
| PSK: Phase shift keying |
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Phase skips to specified phase as same as FSK. |
| ¡@ |
| Gaussian noise |
| Amplitude histogram deviation is meet to Gaussian deviation. |
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