Pulse or digital communications – Repeaters – Testing
Patent
1990-02-27
1991-10-08
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
375 82, 329307, H04L 706
Patent
active
050561154
ABSTRACT:
A device for the simultaneous division of a bandpass signal s(t)=x(t) cos .omega.ot-y(t) sin .omega.ot, .omega.o being an arbitrary angular velocity, into its components x(t), y(t), according to two carriers in quadrature cos .omega.ot and -sin .omega.ot at the angular velocity .omega.o, including a filter (3) for filtering the signal s(t), analog transform circuitry (8;25,26) for producing the Hilbert transform s(t) of the input signal s(t) provided in at least one of the channels of the device, a first sampler (6;21) for sampling the input signal s(t) and a second sampler (9;22) for sampling the Hilbert transform s(t), the samplers being controlled at a sampling frequency fe supplied by a sampling oscillator, fe being not less than 2F, F being the difference between fo=.omega.o/2.pi. and the frequency of the spectrum of the filtered input signal s(t) which is most distant from fo, and two analog-digital converters (7,10;23,24), associated with each sampler (6,9;21,22). The frequency fe and phase of the sampling oscillator are chosen as a function of fo in such a way that at any sampling instant te there is a relationship of the type: ##EQU1## The sampling frequency fe can be chosen to be smaller than fo and the values of the components according to the two carriers in quadrature at .omega.o, x and y, are directly available at the outputs of the analog-digital converters (7,10;23,24) at the sampling instant te.
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Safourek Benedict V.
Tse Young
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