摘要:
The signal processing arrangement is an adaptive digital filter comprising a digital filter coefficient updating circuit (CUC) which supplies updated filter coefficients to a digital filter circuit proper (FC) and is controlled by an error signal (E) derived from the output signal of the filter proper. Each of these two circuits (CUC, FC) is constituted by a systolic processor with a plurality of interconnected cells each able to calculates a function of the type mn + p in a bit serial way and in such a way that bits of a same rank are successively calculated in the cells starting from right to left.
摘要:
The bistate device has a bistate circuit (FF) which when operated brings its outputs (OUT1/2) substantially on respective ones of two voltages (VDD, VSS) by which it is fed, and control means (C) to prevent the operation of this circuit and to thereby bring these outputs (OUT1/2) on a predetermined voltage (VAG) halfway between these two voltages (VDD, VSS) and to disconnect one (VSS) of these two voltages (VDD, VSS) from the circuit, and to enable the operation of the circuit and to thereby disconnect and connect the predetermined voltage (VAG) and this one voltage respectively.
摘要:
A tunable quadrature phase shifter including two branches each constituted by the cascade connection of a filter, an amplifier and a summing circuit, and two cross-connections constituted by amplifiers interconnecting the filter of one branch to the summing circuit of the opposite branch. An accurate 90 degrees phase shift between the two output signals is obtained by controlling the tail currents of the four amplifiers. The phase shifter used in mobile telecommunication transceivers may be easily and accurately tuned because the signals used in the summing circuits all have a similar amplitude. It is further adapted to operate with only 3 Volt battery supply as used in wireless phones. The bandwidth of the amplifiers is increased by using double differential pair amplifiers which behave as cascode arrangements.
摘要:
A line impedance synthesis circuit for a telecommunication line circuit is described which is coupled to line terminals (AW,BW) of a telecommunication line and fed from first (GND) and second (VBAT) terminals of a voltage supply source. The line terminals (AW,BW) are coupled to these supply terminals via respective first and second impedance means which include a main path (A-B) of a first transistor circuit (K1A/K1B) shunted by the series connection of a resistance circuit (TRA/TRB) and a main path (A-B) of a second transistor circuit (K2A/K2B), control electrodes (CT) of the first (K1A/K1B) and second (K2A/K2B) transistor circuits being coupled to a same control output of a control circuit (AMPA,SUMA/AMPB,SUMB).
摘要:
Durch das Erkennungssystem werden eine Vielzahl von Eingangssignalen (TN07) in Multiplextechnik in eine entsprechende Vielzahl entprellter Ausgangssignale (OUTØ/7) gewandelt. Das Signalerkennungssystem enthält eine erste Speichereinheit zum Abspeichern eines Anfangswertes der Eingangssignale, T-Kippglieder (TFFØ/7) zum Abspeichern des entsprechenden Ausgangssignales und ein Exklusiv-ODER Gatter (EOG) zum Vergleichen der Ein- und Ausgangs-. signalzustände. Beim Feststellen eines Unterschiedes im Exklusiv-ODER Gatter (EOG) wird durch eine Addiereinheit (HA) der Inhalt einer zweiten Speichereinheit solange inkrementiert, bis der in den T-Kippgliedern (TFFØ/7) vorgegebene Wert erreicht wird. Dabei entspricht der Anfangswert in der zweiten Speichereinheit clem Anfangswert der ersten Speichereinheit.
摘要:
A data transmission system is proposed in which an auxiliary bitstream of low bitrate (AUX) is coded together with a main bitstream of high bitrate (PRIM) without increasing the transmission rate above the high bitrate. This auxiliary bitstream (AUX) is moreover transmitted synchronously with the main bitstream (PRIM). To achieve this transmitter (T) divides the main bitstream (PRIM) in periodically occurring blocks of Y bits and codes one bit of the auxiliary bitstream (AUX) in each of said blocks by using a first (AMI) or a second (VAMI) coding law according to the binary value of that bit. The second law is constructed by violating the first coding law (AMI) according to a predetermined violation law. Redundancy in the first coding law (AMI) is used to introduce symbol sequences not permitted under this first coding law (AMI) and to so obtain the second coding law (VAMI).