Journal ArticleDOI
The spectrum of modulated pulses
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In this paper, the spectrum of a train of rectangular pulses sinusoidally modulated in any one of these ways is derived, and it is shown that in none of these methods is there any harmonic distortion or audio crosstalk.Abstract:
Some methods proposed for evaluating the spectra of modulated pulse trains are discussed. The basic pulse-frequency, -phase, -length and -amplitude modulation systems are defined and the spectrum of a train of rectangular pulses sinusoidally modulated in any one of these ways is derived. Modulation by more than one tone is also considered. It is shown that in none of these methods is there any harmonic distortion or audio crosstalk. Anharmonic distortion arises from sidebands of harmonics of the pulse repetition frequency, and graphs are given to illustrate its magnitude. The formulae are extended to cover non-rectangular pulses, and it is shown that the distortions to be expected are practically the same as for rectangular pulses. The reproduction of transients is briefly examined. It seems that they suffer little distortion in form but that their timing is modified by the pulse modulation, the maximum time-shift being half the pulse repetition period.read more
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Proceedings ArticleDOI
Spectral analysis of multibit VCO-ADCs and PFM-ADCs with sinusoidal inputs
Eric Gutierrez,Luis Hernandez +1 more
TL;DR: This paper shows that the spectral properties of a single-bit VCO-ADC are retained in the multibit case if an equivalent model is employed, which means that similar equations used to study the performance of single- bit ring oscillator can also be applied to the multIBit case.
Dissertation
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DissertationDOI
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Pulse position modulation spectral investigation
TL;DR: In this paper, the authors investigated the PPM spectrum and its SNR ratio under these conditions and showed that very close agreement between measured results and analytical predictions is demonstrated between the two conditions.
References
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Journal ArticleDOI
Transmission of Television Sound on the Picture Carrier
TL;DR: In this article, the advantages of duplex transmission were analyzed from the point of view of signal-to-noise ratio, audio fidelity, and transmitter and receiver design. But the advantages were not as great as the ratio offered by the transmission of a standard frequency-modulated carrier.
Journal ArticleDOI
A method of transmitting sound on the vision carrier of a television system
TL;DR: In this paper, the authors describe a television system in which sound pulses having a constant height and variable width are inserted in the line synchronizing periods, which leads to a simplified receiver and improves the program quality in the presence of severe interference.
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