Digital multiphase differential modulation system

Claim 2

A phase modulator for modulating a carrier frequency wave according to a multiplicity of digital phase values comprising: a sine wave generator; phase shifting means for imparting at a given bit period to said sine wave a given phase selected among a plurality of 2p phase values, each defined by a parallel word formed of p binary parameters; means for receiving a plurality of p synchronous input serial data signals, each formed of recurrent bits having said given bit period; means for time demultiplexing the bits included in group of n successive bits of the input serial data signals and forming a first parallel binary word with the first bits, a second parallel binary word with the second bits and a nth parallel binary word with the nth bits of the groups of all the serial input data signals, said binary words having a word period equal to n times the bit period and defining phase increments: a plurality of n transcoding means respectively receiving said phase increment defining binary word at a present word period and said phase value defining binary parameters at the preceding word period and forming therefrom phase value defining binary parameters at said present word period; and means for time-multiplexing said phase value defining binary parameters at said present word period formed by said plurality of transcoding means and controlling therewith said phase shifting means.

Claim 3

A phase modulator according to claim 1, in which the number p of phase value defining, binary parameters and of input serial data signals, is equal to 2, the plurality 2p of phase values is 0*, 90*, 180*, 270* and the number n of bits in the groups of bits of the input serial data signals is equal to 2.

Claim 4

A phase modulator according to claim 1, in which the number p of phase value defining, binary parameters and of input serial data signals, is equal to 3, the plurality 2p of phase values is 0*, 45*, 90*, 135*, 180*, 225*,270*, 315*; and the number n of bits in the groups of bits of the input serial data signals is equal to 4.

Claim 5

A phase modulator for modulating a carrier frequency wave according to a multiplicity of digital phase values comprising: a sine wave generator; phase-shifting means including two phase-shifting units each comprising two first gating means controlled by a first binary parameter signal according to the value thereof and receiving respectively the input sine wave produced by said sine wave generator and said input sine wave phase-shifted by 180* and two second gating means controlled by a second binary parameter signal according to the value thereof and receiving respectively said input sine wave phase-shifted by 90* and 270*; means for receiving two synchronous input serial data signals, each formed of recurrent bits having a given bit period; means for time-demultiplexing the bits included in group of n successive bits of the input serial data signals and forming a first two-bit word with the first bits, a second two-bit word with the second bits and a nth two-bit word with the nth bits of the groups of all the serial input data signals, said binary words having a word period equal to n times the bit period and defining phase increments; a plurality of n transcoding means respectively receiving said phase increment defining binary word at a present word period and said phase value defining binary parameters at the preceding word period and forming therefrom phase value defining binary parameters at said present word period; and means for time-multiplexing said phase value defining, binary parameters at said present word period formed by said plurality of transcoding means, thereby forming the first and second binary parameter signals and controlling therewith said first and second gating means.

Claim 6

A phase modulator for modulating a carrier frequency wave according to a multiplicity of digital phase values comprising: a sine wave generator; phase-shifting means including two phase-shifting units each comprising two first gating means controlled by a first binary parameter signal according to the value thereof and receiving respectively the input sine wave produced by said sine wave generator and said input sine wave phase-shifted by 180* and two second gating means controlled by a second binary parameter signal according to the value thereof and receiving respectively said input sine wave phase-shifted by 90* and 270*; means for receiving two synchronous input serial data signals, each formed of recurrent bits having a given bit period; means for time-demultiplexing the bits included in group of n successive bits of the input serial data signals and forming a first two-bit word with the first bits, a second two-bit word with the second bits and a nth two-bit word with the nth bits of the groups of all the serial input data signals, said binary words having a word period equal to n times the bit period and defining phase increments; a plurality of n transcoding means respectively receiving said phase increment defining binary word at a present word period and said phase value defining binary parameters at the preceding word period and forming therefrom phase value defining binary parameters at said present word period; and means for time-multiplexing said phase value defining, binary parameters at said present word period formed by said plurality of transcoding means, thereby forming the first and second binary parameter signals and controlling therewith said first and second gating means.

Claim 7

A phase modulator for modulating a carrier frequency wave according to a multiplicity of digital phase values comprising: a sine wave generator; phase-shifting means including two phase-shifting units each comprising two first gating means controlled by a first binary parameter signal according to the value thereof and receiving respectively an input sine wave and said input sine wave phase-shifted by 180*, two second gating means controlled by a second binary parameter signal according to the value thereof and receiving respectively said input sine wave phase-shifted by 90* and 270*, an additional phase shifting unit comprising two third gating means controlled by a third binary parameter signal according to the value thereof and connected to the sine wave generator and means for selectively applying said generator sine wave and said generator sine wave phase-shifted by a predetermined angle as input sine waves to respectively said two phase-shifting units; means for receiving three synchronous input serial data signals, each formed of recurrent bits having a given bit period; means for time-demultiplexing the bits included in group of n successive bits of the input serial data signals and forming a first three-bit word with the first bits, a second three-bit word with the second bits and a nth three-bit word with the nth bits of the groups of all the serial input data signals, said binary words having a word period equal to n times the bit period andd defining phase increments; a plurality of n transcoding means respectively receiVing said phase increment defining binary word at a present word period and said phase value defining binary parameters at the preceding word period and forming therefrom phase value defining binary parameters at said present word period; and means for time-multiplexing said phase value defining, binary parameters at said present word period formed by said plurality of transcoding means, thereby forming the first, second and third binary parameter signals and controlling therewith said first, second and additional gating means.

Claim 8

A phase modulator for modulating a carrier frequency wave according to a multiplicity of digital phase values comprising: a sine wave generator; phase-shifting means including two phase-shifting units each comprising two first gating means controlled by a first binary parameter signal according to the value thereof and receiving respectively an input sine wave and said input sine wave phase-shifted by 180*, two second gating means controlled by a second binary parameter signal according to the value thereof and receiving respectively said input sine wave phase-shifted by 90* and 270*, an additional phase shifting unit comprising two third gating means controlled by a third binary parameter signal according to the value thereof and connected to the sine wave generator and means for selectively applying said generator sine wave and said generator sine wave phase-shifted by a predetermined angle as input sine waves to respectively said two phase-shifting units; means for receiving three synchronous input serial data signals, each formed of recurrent bits having a given bit period; means for time-demultiplexing the bits included in group of n successive bits of the input serial data signals and forming a first three-bit word with the first bits, a second three-bit word with the second bits and a nth three-bit word with the nth bits of the groups of all the serial input data signals, said binary words having a word period equal to n times the bit period andd defining phase increments; a plurality of n transcoding means respectively receiVing said phase increment defining binary word at a present word period and said phase value defining binary parameters at the preceding word period and forming therefrom phase value defining binary parameters at said present word period; and means for time-multiplexing said phase value defining, binary parameters at said present word period formed by said plurality of transcoding means, thereby forming the first, second and third binary parameter signals and controlling therewith said first, second and additional gating means.