Abstract: The invention relates to a method as well as a circuit arrangement for suppression of a perturbing quadrature component of a carrier signal of an amplitude-modulated signal during the recovery of the carrier signal in a synchronous demodulator, which outputs a quadrature signal (Q). The perturbing quadrature component of the carrier signal is estimated and the estimated quadrature component is subtracted from the quadrature signal (Q).

Abstract: A method for generating random numbers in which oscillating digital output signals of unequal or equal periodicity are generated by at least two ring oscillators, an external parity signal representing a logical state being generated when an odd number of the output signals take on a specified logical state, the external parity signal being fed back to an external parity input of each of the respective ring oscillators. Also, a random number generator having at least two ring oscillators made up of independently freewnning inverter chains with feedback having an odd number of series-connected inverters that generate oscillating digital output signals of unequal or equal periodicity, and having first panty signal generating mechanisms that generate an external parity signal representing a logical state when an odd number of the output signals take on a specified logical state.

Abstract: In a quadrature amplitude (QAM) demodulator, an auxiliary symbol may be utilized in place of the decision symbol to adjust the decision-feedback loops within the demodulator. For the formation and definition of the auxiliary symbol, the radius and angle information of the received signal or of the preliminary symbol may be used. Through use of the auxiliary symbol instead of the decision symbol, any error in the angle information due to the unknown frequency and phase deviation of the local oscillator may be ignored. An auxiliary symbol generator may be provided which, instead of assigning to the received signal an element from the predetermined symbol alphabet, generates an auxiliary symbol that lies on the most probable one of the nominal radii. Nominal radii may mean those radii on which in QAM the predetermined symbols of the alphabet lie in the plane determined by the quadrature signal pair. For the angle component of the auxiliary symbol, the angle information of the sampled digital signal may be used.

Abstract: A Viterbi decoder includes a computing device, a memory and a bus. The computing device receives sets of data values and calculates distances for the received sets of data values, accumulates and compares the calculated distances according to a Viterbi algorithm, decides data values and generates control signals dependent on a plurality of decisions associated with a plurality of paths. The memory stores the decided data values and provides at least one output value. The bus connects the computing device and the memory and is configured to convey the control signals to the path memory. The computing device or the memory shifts data strings in the memory according to conditions of the Viterbi algorithm with the control signals associated with the plurality of paths.

Abstract: In order to suppress interference signals from adjacent TV channels, an intermediate frequency signal is demodulated with a signal (S(fBT; 0°)) at a video carrier frequency into an in-phase signal, and with a signal (S(fBT; 90°)) shifted in phase by a phase angle ?/2 relative to the signal (S(fBT; 0°)) and at a video carrier frequency into a quadrature signal, for example, by an I/Q demodulator. The in-phase signal is filtered by a first Hilbert filter of a Hilbert filter pair having an even symmetrical impulse response in order to obtain a Hilbert-filtered in-phase signal. The quadrature signal is filtered by a second Hilbert filter of the Hubert filter pair having an uneven symmetrical impulse response in order to obtain a Hilbert-filtered quadrature signal. The Hilbert-filtered quadrature signal is added, for example, by an adder to the Hilbert-filtered in-phase signal in order to obtain a video output signal.

Abstract: A system having a consumer electronics device (1) providing an audio signal (21), a device (3) for the setting of, particularly a frequency response and/or a set of dynamics of the audio signal (21), and at least one set of headphones (5) for playing back the audio signal (21), wherein a device (7) for determining an individual hearing characteristic, such as a hearing threshold level of a user, is provided, by means of which particularly the frequency response and/or the dynamics of the audio signal (21) can be adjusted according to the determined hearing characteristic of the user.

Abstract: The invention relates to a compensation circuit (1–6) to compensate nonlinear distortions of an A/D converter comprising a signal input and a compensation system. In order to avoid the high costs related to the complex analog design of the A/D converter and/or the high energy consumption in this converter and compensation system, it is proposed that a compensation circuit be used that is composed of digital circuit elements that are connected following the A/D converter and which has a nonlinearly distorted output signal of the A/D converter supplied to it to compensate the nonlinear distortion. Adaptive coefficients are preferably employed here for the compensation.

Abstract: Television receiver comprising a flat screen display which has a component interface unit spatially separate from the television receiver for the external terminals, such as, for example, SCART sockets or speaker terminals, the component interface unit being connected through at least one high-capacity bus connection to the television receiver. The bus connection is connected in the spatially separate component interface unit to first bus interfaces for signals to be fed in and out, and is connected in the television receiver to second bus interfaces.

Abstract: A Viterbi decoder includes a computing device that receives sets of data values and calculates distances from the received data values and accumulates and compares the distances according to a Viterbi algorithm and decides data values. Also included is a path memory for storing decided-upon data values. A bus connects the computing device and the path memory. The computing device generates control signals dependent on the decisions that are associated with paths. The bus conveys the control signals to the path memory. The computing device and/or the path memory shifts data strings with the control signals associated with the paths in the path memory according to conditions of the Viterbi algorithm. The path memory provides at least one output value. The computing device evaluates the requisite distances, for example all distances required for each set of received values (e.g.

Abstract: A three-dimensional sound system includes a wireless audio signal transmission method for transmitting audio signals between a transmitting device and a spatially adjacent receiving device associated with an audio signal reproduction device such as a speaker. The audio signals may be digitized in the transmitting device, compressed, and transmitted by a digital high-frequency transmission method as data packets. Symbols may be assigned to the individual data in a quadrature signal plane. A diversity operation takes place between the transmitting device and the receiving device, where the transmitting device has two high-frequency transmitters with quadrature conversion which are each connected to an associated transmission antenna. On the receiver side, each audio signal reproduction device has a receiving device with one receiving antenna and one high-frequency receiver.

Abstract: The invention relates to a circuit for channel filtering of an analog or digitally modulated TV signal (125), comprising a video signal (125b), a sound signal (125a), and a video carrier signal (BT) having a video carrier frequency (fBT) at which the TV signal (125) is converted to an intermediate frequency (2nd IF) generating an intermediate frequency signal (SIF). In order to suppress interference signals from adjacent TV channels, according to the invention the intermediate frequency signal (SIF) is demodulated with a signal (S(fBT; 0°)) at a video carrier frequency (fBT) into an in-phase signal (I), and with a signal (S(fBT; 90°)) shifted in phase by a phase angle ?/2 relative to the signal (S(fBT; 0°)) and at a video carrier frequency (fBT) into a quadrature signal (Q), for example, by an I/Q demodulator (3).

Abstract: The invention relates to a method as well as a circuit arrangement for suppression of a perturbing quadrature component of a carrier signal of an amplitude-modulated signal during the recovery of the carrier signal in a synchronous demodulator, which outputs a quadrature signal (Q). The perturbing quadrature component of the carrier signal is estimated and the estimated quadrature component is subtracted from the quadrature signal (Q).

Abstract: The invention relates to a method for generating random numbers in which oscillating digital output signals (A1, A2, . . . , AL) of unequal or equal periodicity are generated by at least two ring oscillators (32, 33, 34), an external parity signal (PS) representing a logical state (“0,” “1”) being generated when an odd number of the output signals (A1, A2, . . . , AL) take on a specified logical state (“1”). According to the invention, the external parity signal (PS) is fed back to an external parity input (36, 37, 38) of each of the respective ring oscillators (32, 33, 34). The invention further relates to a random number generator having at least two ring oscillators (32, 33, 34), made up in particular of independently free-running inverter chains with feedback having an odd number (K) of series-connected inverters (inv1,2, inv2,1, inv3,1, . . . , invi,j, . . . , invL,KL) that generate oscillating digital output signals (A1, A2, . . .

Abstract: In a quadrature amplitude (QAM) demodulator, an auxiliary symbol may be utilized in place of the decision symbol to adjust the decision-feedback loops within the demodulator. For the formation and definition of the auxiliary symbol, the radius and angle information of the received signal or of the preliminary symbol may be used. Through use of the auxiliary symbol instead of the decision symbol, any error in the angle information due to the unknown frequency and phase deviation of the local oscillator may be ignored. An auxiliary symbol generator may be provided which, instead of assigning to the received signal an element from the predetermined symbol alphabet, generates an auxiliary symbol that lies on the most probable one of the nominal radii. Nominal radii may mean those radii on which in QAM the predetermined symbols of the alphabet lie in the plane determined by the quadrature signal pair. For the angle component of the auxiliary symbol, the angle information of the sampled digital signal may be used.

Abstract: A filter (50) with interconnected modular basic units (10) and with a delay line (51), equipped with takeoff points, to furnish delayed sampling values (x1, . . . , xN; xi) of a digital signal (x). Each basic unit (10) contains a programmable weighting device (11, 12), a linkage device (13, 14), and a delay device (15), which delays the data conducted to it by a single period (T) of the sampling clock pulse or by a simple integer multiple thereof. The filter (50) further contains a programmable control device (52), which switches over or switches off a part of the data inputs (16, 17) of the basic unit (10) to achieve forward and/or backward filtering and/or sign inversion and/or a change of the active filter length.

Abstract: The invention relates to a compensation circuit (1-6) to compensate nonlinear distortions of an A/D converter (A/D: analog-to-digital) comprising a signal input and a compensation system.

Abstract: A Portable communications device (1), particularly as an additional functional unit in a radiotelephone (100), comprising an input, output radio interface (2) for local data exchange between two adjacent communications devices (1; 100) or between a communications device (1; 100) and a data processing device (12) adapted to the,local data exchange, or a data-reproducing device (13), or an adapted data source (50). The range (r) of the input/output radio interface (2) is short compared with the range of a conventional radio interface for data :transfer, and corresponds essentially to a talking distance. The communications device (1, 100) further includes a memory device (6) and a data processing device (5). Different data sequences are identified and selectively retrievable in the memory device (6). The activation of the input/output radio interface (2) can be initiated manually.

Abstract: To optimize the sampling of individual symbols (S0 to S3), a sampling control loop (1) for a circuit (2) for receiving digitally transmitted signals (s) is connected to a timing error detector (3) which determines the respective timing error values (td). To improve the control action of the sampling control loop (1), an evaluating device (11) determines a reliability value (v) from signals (I, Q; Is, Qs; sb, sp; sr) of the receiving circuit (2) and controls the sampling control loop (1) in accordance with the reliability value (v).

Abstract: A data transmission method for a packet-like data format with a control section and a following data section. When transmitting the packet-like data format, the data rate is switched between the control section and the data section by a control instruction transmitted in the control section. This increases the data rate for the data section in comparison to the data rate of the control section.

Abstract: A filter (50) with interconnected modular basic units (10) and with a delay line (51), equipped with takeoff points, to furnish delayed sampling values (x1, . . . , xN; xi) of a digital signal (x). Each basic unit (10) contains a programmable weighting device (11, 12), a linkage device (13, 14), and a delay device (15), which delays the data conducted to it by a single period (T) of the sampling clock pulse or by a simple integer multiple thereof. The filter (50) further contains a programmable control device (52), which switches over or switches off a part of the data inputs (16, 17) of the basic unit (10) to achieve forward and/or backward filtering and/or sign inversion and/or a change of the active filter length.