Multiplex transmitter apparatus
AssigneeBell Telephone Laboratories, Incorporated
InventorCecil W. Farrow
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Abstract
Combined amplitude and phase modulation of a multiplexed serial data stream is employed to generate a composite signal for transmission to a receiver. The composite signal includes a prescribed timing signal identifying a predetermined bit position in at least each n.sup.th symbol and group of n.multidot.M bits in the serial data stream. The timing signal forms the amplitude modulation component of the composite signal and is utilized by the receiver for properly resolving an n-fold ambiguity which arises when each symbol includes a nonintegral rational number of frames.
Claims5
Apparatus for generating a composite waveform having a first component signal corresponding to a supplied serial bit stream and a second component signal corresponding to a timing signal, the supplied serial bit stream capable of being partitioned into either consecutive symbols or consecutive frames, the apparatus comprising angle modulation means responsive to consecutive symbols of the supplied serial bit stream for generating the first component signal of the composite waveform, the apparatus characterized by,
- means for generating the timing signal at a predetermined pulse rate corresponding to a rate of occurrence for consecutive groups of (N.multidot.M)/GCD(N,M) bits of the supplied serial bit stream, where M is the number of bits in each symbol, N is the number of bits in each frame, GCD(N,M) is the greatest common divisor of N and M and M/N is a nonintegral rational number, and
- means responsive to the timing signal for amplitude modulating the first component signal therewith to generate the second component signal of the composite waveform.
Dependencies are inferred from the claim text.