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
Credits
Sections
- 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.
Sponsor
Distributor
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