Method for transpoting sub-bands

Details Method for transpoting sub-bands Method for transpoting sub-bands

H - Electricity

04

K

325/3

H04K 1/04 (2006.01)

Patent

CA 1186380

ABSTRACT The invention relates to a method for transposing sub-bands of equal width in a signal-frequency band by means of modulators followed by equal band- pass filters and additional modulators, characterized in that specific carrier- frequencies are permanently assigned to the modulators, and in that arranged between the band-pass filters and subsequent modulators is a switching matrix for scrambling the sub-bands. The method according to the invention has the advan- tage that there is no need to switch over between the carrier-frequencies fed to the modulators and this produces a saving in circuit costs. In a further devel- opment of the invention, the pass-band of the band-pass filter is applied to one of the sub-bands, thus dispensing with two modulators and the production of a carrier-frequency. According to further configurations, favourable values are given for scrambling a CCITT speech-channel.

395659

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