Bbc Brown, Boveri & Company, Limited

Jiri Mastner

Ulrich Kogelschatz

Klaus Ragaller

Otto Lanz

Michael Vitins

A method and apparatus for producing gas discharge reactions in which a reaction gas is at least partially oxygenated after being taken through a discharge channel. In order to produce ozone by means of an electric discharge, the discharge channel has applied thereto an electric alternating voltage signal consisting of a sinusoidal potential (U.sub.a) with positive and negative peak values minimally below the firing potential of the discharge channel, and of alternating voltage impulses superimposed on the sinusoidal potential essentially at the respective maximum and minimum values, in order to achieve an exalted potential above the firing potential to enable a discharge reaction. An ozonizer implemented in this way is also disclosed.

Method and apparatus for the execution of gas discharge reactions

Differential pulse code modulation (DPCM) is used for a fast digital transmission of the analog input signal. In the DPCM modulator, a difference is built between the scaled input signal and the output of a digital/analog converter, which is controlled by a digital integrator. Comparator means generate a DPCM signal with values corresponding to 'no change', 'up-' or 'down-integration' in dependence on the amplitude and polarity of the mentioned difference. The zero-crossings of the input signal itself are detected separately and are converted into a one-bit PCM signal, having the value 'reset'. The DPCM and PCM signals are combined into a multi-value control signal, which is fed to the integrator and causes it to follow-up the input signal and make a reset at each zero-crossing. The multi-value control signal is coded, transmitted to the receiver side of the link and decoded. The different decoded values control an integrator in the demodulator in the same way, as in the modulator. The input signal is reconstructed by digital integration of the DPCM. The periodical reset of the receiving integrator avoids a dc offset of its output, caused in any conventional DPCM system by the initial conditions of the integrator, by transmission errors, by an offset of the modulator and so forth.

Method and apparatus for signal transmission

A method of and apparatus for the detection of short-circuits on lines operated with voltages and currents containing an alternating component, by detecting the temporal progression of the voltage and current at a measurement location in the form of measurement voltages and measurement currents. From the measurement voltage and measurement current or from magnitudes derived therefrom there are formed traveling wave signals of the form:

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Niederrohrdorf, Switzerland

Jiri Mastner