Equalizer and equalizing circuit using the same

DETAILED DESCRIPTION Therefore, an object of the present invention is to provide an equalizing circuit which can be formed by equalizers the number of which is smaller than the number of signal paths.
Another object of the present invention is to provide an equalizer which is most suitably adapted for a time division communication system or the like and which is capable of setting arbitrarily the equalizing characteristics as a function of time in a time division manner.
The first aspect of the invention is an equalizing circuit comprising equalizers for changing the characteristics of the sequentially inputted burst signals to desired characteristics in a time division manner before the burst signals are distributed to a desired number of paths, so that the outputs of the above stated equalizers are provided through a switching circuit which performs switching operation in synchronism with the time dividing operation of the equalizers.
The burst signals to be distributed to a plurality of paths are changed to have prescribed characteristics in a time division manner by means of equalizers provided forwardly of the distributor.
Then, the burst signals having changed characteristics are selected by the switching circuit so that only the necessary signals for the respective signal paths are provided.
Thus, according to the first embodiment of the invention of this application, an equalizing circuit having a small number of components can be manufactured simply and at low cost because even if the number of signal paths is increased, this equalizing circuit can be adapted for such increase by time division operation of a smaller number of equalizers than the number of signal paths without increasing the number of equalizers.
Particularly, the first embodiment provides an equalizing circuit suited for use in a time division multiplex communication network.
The second embodiment of this application comprises coefficient setting means for setting a plurality of coefficients for amplification or attenuation of input signals so that any of the coefficients set by the coefficient setting means is selectively supplied to coefficient applying means