Briefly explain the following terms in two or three sentences?
Periodic signal: If a signal completes a pattern within a measurable time frame or period and repeat the same pattern in equal interval of time.
Sine Waves: A simple analog periodic signals the curve of the cycle oscillates smoothly and consistently each cycle has an arc above and one below the time axis. Describe by amplitude/period or frequency/phase.
Phase: Describes the position of the waveform relative to time zero or origin or describe the amount of backward or forward shift if waveform.
Composite signal: Composed of multiple sine waves
Fourier transform: A technique in which any a periodic signal can be decomposed in infinite number of periodic signals.
Bandwidth: The width of the frequency spectrum of a signal. frequency spectrum is the collection of all component frequencies.
Encoding Digital Signal: The conversion of digital data into digital signal for transmission.
Modulating a digital signal:To convert digital signal into analog signal to transfer it through PSTN connection or ordinary phone.
Modulating an analog signal: To convert analog data into analog signal through analog media – analog to analog conversion.
Digitizing an analog signal: To convert an analog signal to digital signal for safe transmission and noise protection.
Here are some explanations for the terms you enumerated.
1. A periodic signal is the one that has a sequence (called period), which is repeated several times.
2. Sine waves are periodic signals which have an arc above and one below the axis, forming a complete period. The curve is symmetrical with respect to the X axis.
3. The phase is the displacement of a curve relative to the origin of the axis or to another signal.
4. A composite signal is formed by the superposition of multiple signals.
5. The Fourier transform is a way of decomposing a periodic, complicated signal into a series of simple sine and cosine waves.
6. The bandwidth is a measure of the width of a series of frequencies and is measured in Hertz.
7. Encoding digital signal means transforming digital information into a digital signal, ready for transmission.
8. Modulating a digital signal is the conversion of a digital signal into an analog one.
9. Modulating an analog signal means transforming it into another analog signal, with a different frequency. Two main methods are used: amplitude modulation (AM) and frequency modulation (FM).
10. Digitizing an analog signal is useful for a safer transmission. The analog signal is converted into a digital one.
