Time and Frequency (6 Parts)

Synopsis: 1: Uses a spectrum analyser and oscilloscope to show that non-sinusoidal periodic signals can be resolved into harmonic frequency components.
2: Demonstrates the principle of amplitude modulation, showing upper and lower sidebands and effect of different levels of carrier. Envelope independence of carrier, demodulation.
3: Illustrates the frequency spectrum of sinusoidally modulated frequency modulation, relating spectral components to the corresponding Bessel functions. Spectrum for square wave modulation.
4: Shows pulse-width modulation (PWM) in operation with various kinds of modulating signal, with oscilloscope waveform. Spectra of PWM signals, and requirements for demodulation. Application of PWM to high power switching amplifier.
5: Using oscilloscope and spectrum analyser, illustrates the relationships between pulse shape and frequency spectrum. Square, triangular pulses, grouped pulses and pseudo-random sequence.
6: Overview of different styles of modulation, illustrated by waveforms and spectra. Includes AM, FM, PAM, PWM, PCM.
Language: English
Country: Great Britain
Medium: Video; Videocassette. U-matic. b&w. 6 x 10 min.
Year of production: 1974
Availability: Free loan
Sale
Subjects: Engineering
Keywords: electrical and electronic engineering; electrical signals; frequencies; modulation systems

Writer

J Martin

Cast

J Martin

Title: Fourier series
Synopsis: 1: Uses a spectrum analyser and oscilloscope to show that non-sinusoidal periodic signals can be resolved into harmonic frequency components.
Title: Amplitude modulation
Synopsis: 2: Demonstrates the principle of amplitude modulation, showing upper and lower sidebands and effect of different levels of carrier. Envelope independence of carrier, demodulation.
Title: Frequency modulation
Synopsis: 3: Illustrates the frequency spectrum of sinusoidally modulated frequency modulation, relating spectral components to the corresponding Bessel functions. Spectrum for square wave modulation.
Title: Pulse width modulation
Synopsis: 4: Shows pulse-width modulation (PWM) in operation with various kinds of modulating signal, with oscilloscope waveform. Spectra of PWM signals, and requirements for demodulation. Application of PWM to high power switching amplifier.
Title: Periodic pulses
Synopsis: 5: Using oscilloscope and spectrum analyser, illustrates the relationships between pulse shape and frequency spectrum. Square, triangular pulses, grouped pulses and pseudo-random sequence.
Title: Modulation systems
Synopsis: 6: Overview of different styles of modulation, illustrated by waveforms and spectra. Includes AM, FM, PAM, PWM, PCM.

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