Abstract: Method for the reduction of echo and/or noise signals in TK systems for the transmission of useful acoustic signals, in which, when a silence interval is present, the distorted useful signal is modified by a time-dependent control signal ao(t) or by a control signal ao(k) cycled in the rhythm of a scan rate fT=1/T. The control signal ao(k) is varied in such manner that, during the presence of speech signals in the useful signals, the amplitude of the control signal ao(k) is set to a predetermined constant value co and, when a silence interval begins, the amplitude of the control signal ao(k) is reduced continuously from one sample value to the next in accordance with the recurrence formula ao(k+1)=ao(k).? with ?<1. After the end of the silence interval, ao(k) is again set equal to co.

Abstract: The invention relates to an accounting advisor method for guiding a user of a mobile providing a service choice and invoking a selected service (P3), and account processing (P5, P6) at a subscriber's mobile telecommunication device that is enabled for processing multiple accounts and advising a user by further recording user behavior (P2), retrieving accounting information (P1), analyzing service and tariff constraints (P4, P5) based on recorded user behavior and retrieved accounting information, and deriving a recommended service and account selection (P7) based on said analyzing with respect to optimization criteria and optionally negotiating service and tariff characteristics (P6). The invention further relates to a mobile telecommunication device, a base station, and a computer software product.

Abstract: An integrated circuit contains a processor (DSP) for the processing of data, at least two modules (M1, M2, M3) for the processing of data packets selected by the processor according to differing operation regulations, and a router (ROUTER) which is connected to all modules (M1, M2, M3) and to the processor (DSP) for the purpose of controlling the data traffic between the processor (DSP) and the modules (M1, M2, M3). The router is suited to receive from the processor (DSP) data packets and associated instructions, to execute special operations for individual data packets which can be executed by the modules (M1, M2, M3) in specified sequence, to coordinate autonomously the control of the sequences, to transfer the data packets to the appropriate modules (M1, M2, M3), and to transfer the data packets after they have been processed according to the specified instructions to the processor (DSP).

Abstract: A compander circuit (20) for echo cancellation in telecommunications apparatus with an estimator module (21) for estimating an echo coupling and a delay of a line echo and a characteristic module (23) with an associated multiplier (24) for controlling the short-time output level of zout(k) as a function of the short-time input level of zin(k) is characterized in that at all inputs and outputs of the compander circuit (20), a plurality of N communications channels are applied and outputted, respectively, at an N-fold clock rate as compared with a single communications channel; that all memory units in the compander circuit (20) are designed as multiplexer-buffer-demultiplexer (MBD) units (30); and that a modulo-N counter (26) is provided which controls all MBD units (30) so that in each of the MBD units (30), always the same memory cell (351, 352, 35N) assigned to a particular communications channel is addressed.

Abstract: A process for suppressing total echoes comprising a plurality of partial echoes in telecommunications (TK) equipment such as terminals, transmission systems, or switching equipment by means of adaptive FIR (=Finite Impulse Response) filters that simulate the total echo and subtract it from the echo-affected useful signal transmitted to the respective TK equipment, whereby n partial FIR filters are provided, which respectively simulate a partial echo, is characterized in that m parallel, mutually independent TK channels are provided with an echo suppression function and that for this purpose a variable sub-quantity of the partial FIR filters is assigned to a TK channel to be operated, respectively, as required depending on the number of partial echoes and the size of the occurring delay times between signal and echo.

Abstract: An equipment (1) for the suppression of whole echoes composed of several partial echoes in telecommunications (TC) equipment, such as end devices, transmission systems or exchange equipment, with the help of adaptive FIR (=Finite Impulse Response) filters, which reproduce the whole echo and extract it from the echo-laden useful signal and which has been transferred to the respective TC equipment, in which the homogeneous FIR filters or partial filters (10), each of which are able to reproduce a whole echo or partial echo, are implemented on a single ASIC (=Application Specific Integrated Circuit) (9) for the m parallel and independent TC channels n to be served; and in which the whole echoes or partial echoes to be reproduced can be calculated in real time in the ASIC (9) and in which a digital signal processor (4) is designed to control the ASIC (9) and set the filter settings, especially after the coefficient required to reproduce the echo is calculated on the ASIC (9).

Abstract: A method for transmitting to an end subscriber, via an IP (=Internet protocol) network (4), signalling information by means of which the end subscriber is informed that a call is being received, via the IP network (4), which is directed to an IP terminal (5) of the end subscriber, connected to the IP network (4), and which, in particular, is intended to transmit video and/or audio signals, for example, human speech signals, is characterized in that the call signalling is effected independently of the Internet protocol, via a special logical transmission channel on a parallel, or the same, physical connection line via which the call is relayed to the IP terminal. A VolP call can thereby be accepted in a simple manner, irrespective of whether or not the IP terminal is switched on or logged-on.

Abstract: A method for reducing echo signals in telecommunications systems for the transmission of wanted acoustic signals, particularly human speech, in which the presence of echo signals is detected and/or predicted and the detected and/or predicted echo signals are subsequently suppressed or reduced is characterized in that the power value of the noise level N in the currently used telecommunications channel is continuously measured and/or estimated, and that the degree of reduction of the echo signals to be currently effected is set continuously and automatically, in dependence on the current noise level N, according to a predefined function h(N).

Abstract: A process for operating a cordless TC final apparatus with a device for compensating acoustic echoes between loudspeaker and microphone comprises the following steps:

Abstract: Through crosstalk on lines, interference from current transmission lines or line echoes, the useable signal is superimposed by different interference signals. The task is to find a procedure for reducing interference which, compared to the current state of the art, can be achieved with a smaller amount of computing input and is suited to both the reduction of quasi steady-state and non-steady interference. In this, the interference of a received signal is classified with regards to characteristics in the time range as a click, crackle, rumble or noise interference signal. The time range in which the interference occurs is marked. Depending on the interference type, interference blanking and/or an interpolation of the useable signal and/or a subtraction of the interference signal from the useable signal and/or a regeneration of the useable signal is carried out.

Abstract: A method of forming an aggregation of N>1 band-limited time signals, each with a bandwidth of ≦B, which are present as analog and/or digital sampling values, with a respective sampling frequency of fA>2B, is characterized in that the sampling values of all N time signals are offset in time and superimposed on each other, and are jointly input to a low-pass filter (12) with a bandwidth of B′>B, and that a composite signal is tapped off from the output of the low-pass filter (12). This allows the aggregation to be performed in a considerably shorter calculation time, a number of slow and expensive aggregation elements can possibly be saved, and the damping of the signals during processing can be minimized, as well as the corresponding loss of information.

Abstract: A method for setting up fee-optimized communications connections by a communications device (EX1), a server for setting up fee-optimized communications connections and a communications node (EX1) therefor. The communications device provides a database, which stores the fees accruing during the use of the communications paths (CON2A, CON2B) that can be used for setting up a communications connection. A first subscriber (SUB1) then logs on a call request to a second subscriber (SUB2) at the communications device. The communications device then determines a communications path (CON2A) between the first and second subscriber according to the overall lowest fees and sets up a communications connection between the first and second subscriber on said communications path. For this purpose, it is proposed that the communications device determines the fees accrued by said communications connection and charges them to a subscriber.

Abstract: A method for echo and noise compensation in communication systems in which communication terminals are interconnected via switching facilities and transmission links and in which echo- and/or noise-compensating devices are provided in a subset of communication terminals and switching facilities comprises the steps of:

Abstract: Digital filters are used to compensate for echoes in a transmission system in which unwanted couplings occur between a signal value in the receiving direction and a signal value in the transmitting direction. The correct adjustment of the filter coefficients has a considerable influence on the achievable echo compensation. Disturbance signals such as background noises, nonlinear effects in A/D converters or an active local speaker can briefly change the adjustment of the filter coefficients in a way so that the digital filter does not compensate for the echoes and causes additional echoes in unfavorable cases. In accordance with the invention a set of filter coefficients (C(j)) are weighted with an envelope curve (H(j)) and an error measurement (F(j)) is determined therefrom. Depending on the magnitude of the error measurement (F(j)), the filter coefficients (ci) are used for further processing or are discarded.

Abstract: Neural networks are used to classify objects automatically by means of Doppler-broadened radar echo signals. The classification device KK contains a neural network (NET, NET2) which has an input layer (IL) of input nodes (IN1, . . . , IN57) for features (M) of the Doppler-broadened radar echo signals, and an output layer (OL) of output nodes (ON1, ON2, ON3) for predetermined classes to which the objects can be allocated. The neural network (NET, NET2) is adapted to the external conditions prevailing at the time of the classification operation. The adaptation takes place either via accessible input nodes (ZN1, ZN2) into which control information (SI) can be entered, and which cause the neural network (NET) to adapt to one or to several external influence factors, or via a selection device (SEL) which, from the parameters (P1, . . .

Abstract: When telecommunications systems with analog and digital circuit technology are interconnected, the two-wire/four-wire transitions are achieved with hybrid circuits in which mismatches cannot be avoided. They result in signal reflections in the form of interfering echoes which can considerably reduce speech intelligibility. The known methods of echo compensation for hands-free facilities are not suitable for compensating line echoes, since the signal level and the delay times of lines can be very different. A compander (3.7) is used to suppress the effect of line echoes, whose transmission characteristic, in addition to being controlled by a coupling factor between the transmit path and the receive path, and by a control signal determined by the noise level, is also controlled in the invention with the speech level that is received from the distant subscriber.

Abstract: A method of adaptive echo cancellation finds application for example in the hands-free facilities of telecommunications terminals, to compensate for disturbing echoes from the acoustic feedback between loudspeaker (1) and microphone (2). It is known to simulate these echoes (h(k)) with digital filters, and to subtract them from the echo-affected microphone signal (z(k)). The realization usually requires a signal processor with a high operating speed, a floating point logic and a large memory space. The task is to present a cost-effective method, which can be used under different acoustic conditions. The invention fulfills this task by using a known FIR filter (5), whose filter coefficients (c.sub.1 to c.sub.N) are determined according to the NLMS algorithm. The step width (.alpha.), which determines the changing speed of the filter coefficients (c.sub.1 to c.sub.