| Patent Number |
Title Of Patent |
Date Issued |
| 6185202 |
Point-to-multipoint radio transmission system |
February 6, 2001 |
| In order to allow a flexible allocation of transmission capacities in a radio transmission system, without disrupting or interrupting existing radio connections, a control device is provided which, in the event of a change in the transmission channels, adjusts one or more of the tran |
| 6151513 |
Aerial for a central station of a point-to-multi-point radio link system |
November 21, 2000 |
| To enable the antenna of a central station of a point-to-multipoint radio relay system to be operated with as little transmitting power as possible and to assure high transmission quality, the antenna produces a characteristic composed of a plurality of sectors which are so designed |
| 5530471 |
Radio and television distribution system |
June 25, 1996 |
| A distribution system, useful with radio and television distribution, for distributing a signal having a plurality of channels includes a central station. The central station produces a first frequency division multiplexed signal in which signals from a plurality of channels or chann |
| 5461612 |
Drop-and-add multiplexer for converting and processing a frequency multiplex signal |
October 24, 1995 |
| A drop-and-add multiplexer for receiving an incoming FDM signal with a plurality of channels, for receiving signals of additional channels, and for outputting an outgoing FDM signal. The multiplexer includes at least one single channel filter for receiving an incoming FDM signal, filteri |
| 5369487 |
Device for determining the amplitude of the spectral lines in the output signal from a ring inte |
November 29, 1994 |
| An arrangement for determining the amplitudes of spectral lines contained in the phase-modulated output signal of an optical ring interferometer which are suited to determine the angular velocity with which the ring interferometer is rotated, for which a digital evaluation circuit is |
| 5185642 |
Improved method and arrangement for processing output signals of a fiber ring interferometer |
February 9, 1993 |
| A method and circuit arrangement for determining angular velocities by means of an optical fiber ring interferometer includes, in addition to, a phase modulator for modulating light waves passing through an optical fiber ring of the interferometer at a phase modulation frequency f, and a |
| 5177700 |
Non-recursive half-band filter |
January 5, 1993 |
| A non-recursive half-band filter having a filter length N and complex coefficients for receiving either a real input signal s(kT) or a complex input signal s(2kT) and for processing and converting the received input signals into either a complex output signal s(2kT) or a real output sign |
| 5127732 |
Method and arangement for determining angular velocities |
July 7, 1992 |
| A method and circuit arrangement for determining angular velocities with the aid of an optical fiber ring interferometer includes filter circuitry for selecting the amplitudes of four adjacent spectral lines of resultant interfering light waves exiting from the interferometer, a first ad |
| 5068817 |
Non-recursive half-band filter with complex valued coefficients for complex input and output sig |
November 26, 1991 |
| A non-recursive half-band filter having a filter length N includes a receiver unit for receiving a complex input signal having a real component and an imaginary component at a sampling frequency fA, where fA=1/T; and a processing and converting unit for processing and converting the rece |
| 4953118 |
Nonrecursive half-band filter |
August 28, 1990 |
| A nonrecursive half-band filter which permits the conversion of a complex-value input signal into a complex-value output signal. The pulse response of the filter is modulated onto a complex carrier at a frequency of 1/4 or 3/4 of the sampling rate, the zero phase of this frequency is a |
| 4903020 |
Method and apparatus for digitally processing stored compressed analog signals |
February 20, 1990 |
| Method and apparatus for processing compressed, stored analog signals, such as audio signals, from a storage medium, including first converting the signals to digital signals and thereafter expanding the signals.To realize a large volume range in the conversion of compressed recorded sig |
| 4896320 |
Filter bank for frequency demultiplexing in multiple channels |
January 23, 1990 |
| A filter bank for frequency demultiplexing or multiplexing, respectively, of L channel signals. The filter bank is composed of L transversal filters (non-recursive filters, that is filters having an impulse response of finite duration having complex valued coefficients, for real value in |
| 4839889 |
Digital filter tree |
June 13, 1989 |
| The invention relates to a digital filter tree composed of a plurality of digital filter banks arranged in a tree structure one behind the other to branch out in stages with a separation into L.sub..nu. individual signals taking place in each stage and the sampling rate being reduced eac |
| 4792943 |
Digital filter bank |
December 20, 1988 |
| A circuit including a digital filter bank for effecting conversion between a frequency multiplex signal having a sampling rate f.sub.A and L product sums corresponding to the sampled values of the frequency multiplex signal, the pulse response of the filter bank being of finite length, a |
| 4725972 |
Method and apparatus for the transmission of time discrete signals between systems operating at |
February 16, 1988 |
| A method and apparatus for the transmission of time discrete signals between source and sink systems wherein a first signal x(n) is generated by the source system at a first sampling rate f.sub.i and a second time discrete signal y(m) is generated by a sink system at a second sampling |
| 4510598 |
Digital transmultiplexer |
April 9, 1985 |
| A system for the digital conversion of a time division multiplex signal into a frequency division multiplex signal wherein the signals of the individual time multiplex channels are filtered by means of bandpass filters, their sampling rates are increased by the factor N to fA and the |
| 4435773 |
Receiver for effecting synchronous demodulation |
March 6, 1984 |
| In a receiver for synchronously demodulating real bandpass signals and including circuit elements connected for removing noise, equalizing the signals, converting the resulting signals to analytical signals, shifting the signals in phase, sampling the signals at the signal element timing |
| 4389616 |
Method and arrangement for the digital regulation of the carrier phase error in receivers of dat |
June 21, 1983 |
| A method for digitally regulating the residual carrier phase error in receivers of digital data transmission systems. A comparator compares the sampled data signal or value of the carrier demodulated input signal to the receiver with the estimated value for each associated sampling time |
| 4388724 |
Adaptive equalizer device |
June 14, 1983 |
| In a device for equalizing multiphase and/or multiamplitude modulated data signals, which device includes a decider connected to receive a demodulated input signal and to produce a demodulated output signal, an equalizer, and a difference forming member connected to produce an output |
| 4327439 |
Method for generating modem transmission signals with quadrature amplitude modulation |
April 27, 1982 |
| A method for generating modem transmission signals with quadrature amplitude modulation (QAM) wherein scanned values of elementary bandpass signals are stored in digitally coded form, the elementary bandpass signals are weighted with coefficients depending on the information to be tr |
