Asked By
ahmadraza
10 points
N/A
Posted on  08/01/2011
Briefly explain the following terms in two or three sentences?

Periodic Signal.

Sine wave.

Phase.

Composite signal.

Fourier Transform.

Bandwidth.

Encoding Digital Signal.

Modulating a digital signal.

Modulating an analog signal.

Digitizing an analog signal.
Answered By
James20
0 points
N/A
#96601
Briefly explains in two or three sentences the following terms?
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.
Briefly explains in two or three sentences the following terms?
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.