Method and system for compressing bandwidth

Claim 1

A method for compressing the bandwidth of a signal 2(t) which comprises: a. applying the signal to a first means adapted for providing simultaneously at n+ 1 outputs a group of samples of s(t) representing individually the successive sampled values of s(t) at the times t, (t-T) .... (t- nT) where T is a fixed time interval; b. gating said group of samples to a plurality of weighting networks adapted to weight the individual samples into a new group of (n+ 1) samples of another signal u(t), such that where j- 0, .... 1, . . . . n, the coefficients aij inserted by said weighting network being selected to meet the constraints that: 1. the matrix A aij be nonsingular whereby s(t) is recoverable from u(t), 2. the power in the transmitted sequence u(t), be less than in s(t) by a desired amount, and 3. when the signal s(t) is recovered the reconstituted noise is such that the signal-to-noise ratio is not degraded, sufficient redundancy being present in s(t) to enaBle imposition of all three of said constraints; c. applying the output of each weighting network to a separate analog-to-digital converter, each of which has a plurality of outputs, the total number of these outputs being determined by the number of levels required by the signal and where the number of levels 2x where x is the total number of such outputs; d. applying the signal from each of these plurality of outputs to a second means for producing a plurality of outputs wherein each succeeding output is delayed from the preceding output and the delay between adjacent outputs of the said second means is equal to or less than one-half the time interval T; e. transmitting the output of the said second means as a serial binary number.

Claim 2

A method for compressing the bandwidth of a signal 2(t) which comprises: a. applying the signal to a first means adapted for providing simultaneously at n+ 1 outputs a group of samples of s(t) representing individually the successive sampled values of s(t) at the times t, (t-T) .... (t- nT) where T is a fixed time interval; b. gating said group of samples to a plurality of weighting networks adapted to weight the individual samples into a new group of (n+ 1) samples of another signal u(t), such that where j- 0, .... 1, . . . . n, the coefficients aij inserted by said weighting network being selected to meet the constraints that: 1. the matrix A aij be nonsingular whereby s(t) is recoverable from u(t), 2. the power in the transmitted sequence u(t), be less than in s(t) by a desired amount, and 3. when the signal s(t) is recovered the reconstituted noise is such that the signal-to-noise ratio is not degraded, sufficient redundancy being present in s(t) to enaBle imposition of all three of said constraints; c. applying the output of each weighting network to a separate analog-to-digital converter, each of which has a plurality of outputs, the total number of these outputs being determined by the number of levels required by the signal and where the number of levels 2x where x is the total number of such outputs; d. applying the signal from each of these plurality of outputs to a second means for producing a plurality of outputs wherein each succeeding output is delayed from the preceding output and the delay between adjacent outputs of the said second means is equal to or less than one-half the time interval T; e. transmitting the output of the said second means as a serial binary number.

Claim 16

A system for compressing the bandwidth of a signal which comprises: a. first means for producing a plurality of outputs wherein each succeeding output is delayed from the preceding output to which the signal to be compressed is applied; b. a plurality of networks to each of which one of the plurality of outputs is applied; c. a gate supplying a gate signal to each network so that the voltage at its output is equal to the voltage at its input, d. a plurality of weighting networks having their inputs connected to the output of each network; e. each of the weighting networks comprising an amplifier, an input resistor connected between the network and the input to the amplifier and a feedback resistor connected between the output and input of the amplifier; f. a plurality of analog-to-digital converters; g. the output of each weighting network being connected to one of the analog-to-digital converters, there being an analog-to-digital converter connected to each weighting network; h. a plurality of AND gates; i. each analog-to-digital converter having a plurality of outputs each of which is connected to one of the AND gates, the number of outputs being determined by the number of signal levels required to transmit the compressed signal as given by number of levels 2x where x is the number of outputs; j. second means for producing a plurality of outputs wherein each succeeding output is delayed from the preceding output; k. the output of each AND gate being connected to one of the outputs of the second means, the delay between adjacent taps thereof being equal to or less than one-half that of the delay between outputs of the first delay line; l. the output of the second means being transmitted as a serial binary number.

Claim 17

A system for compressing the bandwidth of a signal which comprises: a. first means for producing a plurality of outputs wherein each succeeding output is delayed from the preceding output to which the signal to be compressed is applied; b. a plurality of networks to each of which one of the plurality of outputs is applied; c. a gate supplying a gate signal to each network so that the voltage at its output is equal to the voltage at its input, d. a plurality of weighting networks having their inputs connected to the output of each network; e. each of the weighting networks comprising an amplifier, an input resistor connected between the network and the input to the amplifier and a feedback resistor connected between the output and input of the amplifier; f. a plurality of analog-to-digital converters; g. the output of each weighting network being connected to one of the analog-to-digital converters, there being an analog-to-digital converter connected to each weighting network; h. a plurality of AND gates; i. each analog-to-digital converter having a plurality of outputs each of which is connected to one of the AND gates, the number of outputs being determined by the number of signal levels required to transmit the compressed signal as given by number of levels 2x where x is the number of outputs; j. second means for producing a plurality of outputs wherein each succeeding output is delayed from the preceding output; k. the output of each AND gate being connected to one of the outputs of the second means, the delay between adjacent taps thereof being equal to or less than one-half that of the delay between outputs of the first delay line; l. the output of the second means being transmitted as a serial binary number.

Claim 24

A system for compressing the bandwidth of a signal s(t), while substantially retaining intelligence and signal-to-noise ratio, comprising: a. first means adapted for providing simultaneously at n+ 1 outputs a first group of samples of s(t) representing individually the successive sampled values of s(t) at the times t, (t-T), ... (t- nT), where T is a fixed time interval; b. means for gating said group of samples to; c. a plurality of weighting networks adapted to weight the individual samples into a new group of (n+ 1) samples of another signal u(t), such that uj(ti) aijs(t- iT), where j-0, 1, .... n, the coefficients aij inserted by said weighting network being selected to meet the constraints that:

Claim 25

A system for compressing the bandwidth of a signal s(t), while substantially retaining intelligence and signal-to-noise ratio, comprising: a. first means adapted for providing simultaneously at n+ 1 outputs a first group of samples of s(t) representing individually the successive sampled values of s(t) at the times t, (t-T), ... (t- nT), where T is a fixed time interval; b. means for gating said group of samples to; c. a plurality of weighting networks adapted to weight the individual samples into a new group of (n+ 1) samples of another signal u(t), such that uj(ti) aijs(t- iT), where j-0, 1, .... n, the coefficients aij inserted by said weighting network being selected to meet the constraints that: