Diversity channel data receiver with automatic alignment over a +/-3.5-bit range

• Main Authors: CORNET; JEAN-FRANCOIS R, CLEMENT; PATRICK
• Format: Patent
• Language: English
• Published: 10.05.1988
• Edition: 4
• Subjects: ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; TRANSMISSION; TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION

An arrangement ensuring the change-over of two channels through which the same digital information is conveyed with automatic data alignment over a +/-3.5 bit range comprises for each channel an array of buffer stores operating at a write rate Hi/Ni (where i=1, 2), an oscillator operating at a rate H which provides reading of the buffer stores at the rate H/N and being synchronized in phase-opposition with one or the other of the write rates, and a logic comparator controlling the write rates Hi/Ni, the routing of the write rates to the input of the oscillator, as well as a change-over switch for the data. In the buffer store of the channel assumed to be the one whose quality degrades, the data are converted into N parallel streams at the rate H2/N and are read at the rate H/N of the oscillator. In the other channel, the write rate of the buffer store is forced to the rate H1/N-1, the read rate remaining unchanged, until there is a coincidence of N bits in the two channels; thereupon the data stream is switched, the write rate is locked at H1/N and this write rate is applied to the oscillator.