Device for forming channels

DETAILED DESCRIPTION The system according to the invention makes it possible to simplify the switching means which entail a great quantity of equipment.
Moreover, it enables a simplification of the chain which can comprise fewer elements and which elements (delay devices) can be standardized while still maintaining sufficient precision.
The channel forming system according to the invention comprises H detectors regularly spaced out on a circular base, H peak limiters, each peak limiter being connected to the output of a detector, a chain constituted by an alternate sequence of adders and of delay devices, each delay device comprising several elementary delay cells .
tau.
(.
tau.
= 1/F.
sub.
H) and being connected at their output to an input of an adder of the chain, is characterized in that it further comprises: A SHIFT REGISTER FORMING A LOOPED CIRCUIT AND COMPRISING H stages, the parallel inputs of the said stages being connected to the outputs of the H peak limiters and the parallel outputs of the said stages being connected to inputs of the said adders of the chain, and A CLOCK SUPPLYING A FREQUENCY F.
sub.
V = F.
sub.
H /H by means of which the output signals are sampled by the said register and a frequency F.
sub.
H by means of which the data advances along the stages of the said register and along the delay devices.
By means of the shift register which is used for sampling, the use of N multiplexers having H inputs can be avoided; moreover, in the delay device according to the invention, the delay function which was fulfilled previously in the known device exclusively by the delay devices is also fulfilled by the input shift register so that the delay devices are less numerous than those in the known chain.
According to a preferred embodiment of the invention, the delay devices all have an identical delay T, this leading to a precision of .
+-.
T/2 on the measurements.
According to a first variant of the invention making it possible to improve the precision in the measurements without changing the number of delay devices constituting the chain, the device for forming channels comprises H detectors regularly spaced out on a circular base, H peak limiters, each peak limiter being connected to the output of a detector, a chain constituted by an alternate sequence of adders having several inputs and of delay devices, each delay device comprising several elementary delay cells