Digital Hilbert transformation system

Claim 2

A digital Hilbert transformation system comprising first means for generating first and second reference signal samples in mutual phase quadrature with each other; multiplexing means for selectively time division multiplexing the first and second reference signal samples into first and second time slots and for selectively time division multiplexing the first and second reference signal samples into third and fourth time slots; input means responsive to an input signal and to the first and second reference signal samples in the first and second time slots for selectively developing first and second transformed signal samples; second means for selectively heterodyning the first and second transformed signal samples with the first and second reference signal samples in the third and fourth time slots to develop a plurality of product signals; and demultiplexing means being selectively responsive to components of the plurality of product signals for providing first and second output signals, the first output signal having first frequency components and the second output signal having second frequency components which are shifted in phase by 90* from the respective first frequency components of the first signal.

Claim 3

The system of claim 1 wherein said demultiplexing means includes: first digital tapped delay means being responsive to the plurality of product signals for providing a plurality of different time delayed plurality of product signals; first and second combining means being selectively responsive to the plurality of differently time delayed plurality of product signals for developing first and second combined signals; and first and second circuits for sampling and holding the first and second combined signals, respectively, to develop the first and second output signals.

Claim 4

The system of claim 1 wherein said first means includes: third means for developing digital sine and cosine signals; and third and fourth circuits for sampling the digital sine and cosine signals, respectively, to develop the first and second reference signal samples.

Claim 5

The system of claim 1 wherein said multiplexing means includes: first delay means for delaying the first reference sample by a first time interval to develop a first delayed first reference sample; first multiplexer means responsive to the first delayed first reference sample and to the second reference sample for selectively time division multiplexing the first and second reference signal samples into the first and second time slots; and second multiplexer means responsive to the first delayed first reference sample and to the second reference sample for selectively time division multiplexing the first and second reference signal samples into the third and fourth time slots.

Claim 6

The system of claim 4 wherein said first multiplexer means includes: second delay means for delaying the first delayed first reference signal sample by a second time interval to develop a twice delayed first reference sample; fourth means for combining the twice delayed first reference signal sample with the second reference signal sample to develop a first interleaved signal; third delay means for delaying the first interleaved signal by a third time interval to produce a delayed first interleaved signal; and fifth means responsive to the first interleaved signal and the delayed first interleaved signal for selectively time division multiplexing the first and second reference signal samples into the first and second time slots.

Claim 7

The system of claim 4 wherein said second multiplexer means includes: sixth means for combining the first delayed first refErence signal sample with the second reference signal sample to develop a second interleaved signal; fourth delay means for delaying the second interleaved signal by a fourth time interval to produce a delayed second interleaved signal; and seventh means responsive to the second interleaved signal and the delayed second interleaved signal for selectively time division multiplexing the first and second reference signal samples into the third and fourth time slots.

Claim 8

The system of claim 6 wherein said first multiplexer means includes: said delay means for delaying the first delayed first reference signal sample by a second time interval to develop a twice delayed first reference sample; fourth means for combining the twice delayed first reference signal sample with the second reference signal sample to develop a first interleaved signal; third delay means for delaying the first interleaved signal by a third time interval to produce a delayed first interleaved signal; and fifth means responsive to the first interleaved signal and the delayed first interleaved signal for selectively time division multiplexing the first and second reference signal samples into the first and second time slots.

Claim 9

The system of claim 1 wherein said input means includes: first heterodyning means responsive to the input signal and to the first and second reference signal samples in the first and second time slots for developing a first time division multiplexed heterodyned signal; and filter means responsive to the first time division multiplexed heterodyned signal for developing the first and second transformed signal samples.

Claim 10

The system of claim 8 wherein said first heterodyning means includes: means for sampling and holding the input signal, and first multiplier means responsive to the sampled and held input signal and to the first and second reference signal samples in the first and second time slots for developing the first time division multiplexed heterodyned signal.

Claim 11

A digital Hilbert transformation system comprising: first means for generating first and second reference signal samples in mutual phase quadrature with each other; first multiplexing means for alternately multiplexing the first and second reference signal samples into first and second time slots; second multiplexing means for alternately multiplexing the first and second reference signal samples into third and fourth time slots; input means responsive to an input signal and to the first and second reference signal samples in the first and second time slots for alternately developing first and second transformed signals; second means for selectively heterodyning the first and second transformed signals with the first and second reference signal samples in the third and fourth time slots to develop first and second product signals; first demultiplexing means being responsive to first selected components of the first and second product signals for providing a first output signal having first frequency components; and second demultiplexing means being responsive to second selected components of the first and second product signals for providing a second output signal, the second output signal having second frequency components which are shifted in phase by 90* from the respective first frequency components of the first signal.

Claim 12

A digital Hilbert transformation system comprising: first means for generating first and second reference signal samples in mutual phase quadrature with each other; first multiplexing means for alternately multiplexing the first and second reference signal samples into first and second time slots; second multiplexing means for alternately multiplexing the first and second reference signal samples into third and fourth time slots; input means responsive to an input signal and to the first and second reference signal samples in the first and second time slots for alternately developing first and second transformed signals; second means for selectively heterodyning the first and second transformed signals with the first and second reference signal samples in the third and fourth time slots to develop first and second product signals; first demultiplexing means being responsive to first selected components of the first and second product signals for providing a first output signal having first frequency components; and second demultiplexing means being responsive to second selected components of the first and second product signals for providing a second output signal, the second output signal having second frequency components which are shifted in phase by 90* from the respective first frequency components of the first signal.

Claim 13

A digital Hilbert transformation system comprising: first means for digitally developing sine and cosine reference samples of a reference frequency signal; second means being responsive to the sine and cosine reference samples for developing a first multiplexed output; third means being responsive to the sine and cosine reference samples for developing a second multiplexed output; fourth means for heterodyning input signal samples with the first multiplexed output to develop a first multiplexed heterodyned data output; fifth means being responsive to the First multiplexed heterodyned data output for providing a filtered output signal having the desired frequency response characteristics; sixth means for heterodyning the filtered output signal with the second multiplexed output to develop a second multiplexed heterodyned data output; and seventh means for selectively combining components in the second multiplexed heterodyned data output to provide first and second output signals, the second output signal having frequency components which are shifted in phase by 90* from corresponding frequency components in the first output signal.

Claim 14

A digital Hilbert transformation system comprising: first means for digitally developing sine and cosine reference samples of a reference frequency signal; second means being responsive to the sine and cosine reference samples for developing a first multiplexed output; third means being responsive to the sine and cosine reference samples for developing a second multiplexed output; fourth means for heterodyning input signal samples with the first multiplexed output to develop a first multiplexed heterodyned data output; fifth means being responsive to the First multiplexed heterodyned data output for providing a filtered output signal having the desired frequency response characteristics; sixth means for heterodyning the filtered output signal with the second multiplexed output to develop a second multiplexed heterodyned data output; and seventh means for selectively combining components in the second multiplexed heterodyned data output to provide first and second output signals, the second output signal having frequency components which are shifted in phase by 90* from corresponding frequency components in the first output signal.

Claim 15

A digital Hilbert transformation system comprising: a reference generator for developing sine and cosine reference samples of a reference frequency signal; a first multiplexer for multiplexing the sine and cosine reference samples into a first composite signal; a second multiplexer for multiplexing the sine and cosine reference samples into a second composite signal; first multiplier means for selectively heterodyning the multiplexed sine and cosine reference samples in the first composite signal with input signal samples to develop first and second streams of data; filter means for selectively filtering the first and second streams of data; second multiplier means for selectively heterodyning the multiplexed sine and cosine reference samples in the second composite signal with the filtered first and second streams of data to develop third, fourth, fifth and sixth streams of data; output means for selectively combining the third, fourth, fifth and sixth streams of data into first and second output signals, the second output signal being the Hilbert transform of the first output signal.

Claim 16

A digital Hilbert transformation system comprising: a reference generator for developing sine and cosine reference samples of a reference frequency signal; a first multiplexer for multiplexing the sine and cosine reference samples into a first composite signal; a second multiplexer for multiplexing the sine and cosine reference samples into a second composite signal; first multiplier means for selectively heterodyning the multiplexed sine and cosine reference samples in the first composite signal with input signal samples to develop first and second streams of data; filter means for selectively filtering the first and second streams of data; second multiplier means for selectively heterodyning the multiplexed sine and cosine reference samples in the second composite signal with the filtered first and second streams of data to develop third, fourth, fifth and sixth streams of data; output means for selectively combining the third, fourth, fifth and sixth streams of data into first and second output signals, the second output signal being the Hilbert transform of the first output signal.