Term
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Definition
| Varying some characteristic of the electrical carrier wave as the information to be transmitted on that carrier wave varies. |
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Term
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Definition
Carrier can be any waveshape but usually is a sine wave.
In - Baseband Signal goes into Modulator
Modulator - Multiplies carrier and baseband together.
Out - Modulated Carrier (frequency shifted) |
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Term
| Modulation Process Details |
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Definition
The max amplitude of hte carrier is made to follow the instantaneous amplitude of the baseband.
Output - The carrier then brings the info on the modulating signal to a different range of frequencies. |
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Term
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Definition
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Term
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Definition
| the waveform observed when the CARRIER, UPPER SIDEBAND, and LOWER SIDEBAND are combined in a single impedance and observed as time versus amplitude. |
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Term
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Definition
| The act of extracting the original information-bearing signal from a modulated carrier wave. |
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Term
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Definition
| How much the modulated variable (amplitude, frequency, phase) varies around its unmodulated level. |
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Term
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Definition
| When the instantaneous level of the modulated signal exceeds the value necessary to produce 100% modulation of the carrier. |
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Term
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Definition
| To reproduce a sound or signal at below the optimal out put level |
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Term
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Definition
| an electronic circuit (or computer program in a software defined radio) that is used to recover the information content from the modulated carrier wave. |
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Term
| ASK (Amplitude Shift Keying) |
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Definition
| A form of modulation that represents digital data as variations in the amplitude of a carrier wave. |
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Term
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Definition
| Frequency of the carrier is made to vary in proportion to the changing amplitude of the modulating signal. |
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Term
| FSK (Frequency Shift Keying) |
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Definition
| Modulation scheme in which digital information is transmitted through discrete frequency changes of a carrier wave. (e.g., In binary, low frequency is 0 and high frequency is 1). |
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Term
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Definition
| Modulation that represents information as variations in the instantaneous phase of a carrier wave. There is an incidental frequency change as well. |
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Term
| Binary Phase Shift Keying (BPSK) |
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Definition
| A type of phase modulation using 2 distinct carrier phases to signal ones and zeros. |
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