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US 5,153,532 AGranted
Noise generator using combined outputs of two pseudo-random sequence generators
AssigneeHoneywell Inc.
InventorsSteven C. Albers, Timothy J. Callaghan, William L. Rasmussen, Robert A. Pajak
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Abstract
The pseudo-random-bit sequence generators are clocked by separate clock signals of different frequency. The two pseudo-random-bit sequence generator outputs are logically combined by an exclusive-or gate to provide a pseudo-random-bit sequence generator which, when converted to analog signal has improved white noise characteristics.
Claims14
A pseudo-random-bit-sequence generator comprising:
- means for generating a first signal of a first frequency;
- means for generating a second signal of a second frequency different than said first frequency;
- a first signal generator, responsive to said first signal, for providing a first pseudo random output signal having a first pseudo-random-bit-sequence having a first selected repeat sequence length which repeats after a selected number of cycles of said first frequency;
- and
- a second signal generator, responsive to said second signal, for providing a second pseudo random output signal having a second pseudo-random-bit-sequence having a second repeat sequence length which repeats after a selected number of cycles of said second frequency;
- and
- logic means, having an output, a first input for receiving said first pseudo random output signal, and a second input for receiving said second pseudo random output signal, said logic means operative for logically operating on said first and second pseudo random output signals and providing a third pseudo random output signal having a pseudo-random-bit sequence which is a function of said first and second clock signal frequencies, and said first and second pseudo-random-bit sequences.
4 more elements
A pseudo-random-bit sequence generator comprising:
- a signal source for providing a first signal of a first frequency;
- and
- first means for operating on said first signal and deriving, therefrom, a second signal of a second frequency and a third signal of a third frequency different than said second frequency;
- a first signal generator, responsive to said second signal, for providing a first pseudo random output signal having a first pseudo-random-bit sequence having a first selected repeat sequence length which repeats after a selected number of cycles of said second frequency;
- and
- a second signal generator, responsive to said third signal, for providing a second pseudo random output signal having a second pseudo-random-bit sequence having a second repeat sequence length which repeats after a selected number of cycles of said third frequency;
- and
- logic means, having an output, a first input for receiving said first pseudo random output signal, and a second input for receiving said second pseudo random output signal, said logic means operative for logically operating on said first and second pseudo random output signals and providing a third pseudo random output signal having a pseudo-random-bit sequence which is a function of said second and third signal frequencies, and said first and second pseudo-random-bit sequences.
5 more elements
A pseudo-random-bit sequence generator comprising:
- means for generating a first signal of a first frequency;
- means for generating a second signal of a second frequency different than said first frequency;
- a first signal generator, responsive to said first signal, for providing a first pseudo random output signal;
- and
- a second signal generator, responsive to said second signal, for providing a second pseudo random output signal;
- and
- signal processing means, having an output, a first input for receiving said first pseudo random output signal, and a second input for receiving said second pseudo random output signal, said signal processing means operative for operating on said first and second pseudo random output signals and providing a third pseudo random output signal representative of the product of said first and second pseudo random output signals.
4 more elements
A pseudo-random-bit generator comprising:
- means for generating a first signal of a first frequency;
- means for generating a second signal of a second frequency different than said first frequency;
- a first signal generator, responsive to said first signal, for providing a first pseudo random output signal having a first pseudo-random-bit-sequence having a first selected repeat sequence length which repeats after a selected number of cycles of said first frequency;
- and
- a second signal generator, responsive to said second signal, for providing a second pseudo random output signal having a second pseudo-random-bit-sequence having a second repeat sequence length different than said first repeat sequence length and said second repeat sequence repeats after a selected number of cycles of said second frequency;
- and
- logic means, having an output, a first input for receiving said first pseudo random output signal, and a second input for receiving said second pseudo random output signal, said logic means operative for logically operating on said first and second pseudo random output signals and providing a third pseudo random output signal having a pseudo-random-bit sequence which is a function of said first and second clock signal frequencies, and said first and second pseudo-random-bit sequences.
4 more elements
Dependencies are inferred from the claim text.