Abstract: In a device for processing baseband signal images (BS), a film detector determines whether a same baseband signal image includes both information from a film image and information from a video source image, information from one film image being present in at least two baseband signal images while information from one video source image is present in only one baseband signal image. A processing unit processing the baseband signal images in such a manner that in the presence of both information from the film image and information from the video source image in the same baseband signal image, for each film image only one of the at least two baseband signal images is used to obtain a display signal image (DS).

Abstract: It is an object of the invention to improve the performance of a multitasking data processing system in which at least one exclusive resource is used for executing at least two task flows. The method according to the invention achieves this by using a so-called master schedule, which is used as a template to construct the schedules for individual task flows. The term master schedule refers to a set of reservations of the exclusive resources for task flows.

Abstract: In a method of encoding a source signal by determining Line Spectral Frequencies (LSFs) for representing Linear Predictive Coding (LPC) filter coefficients, real zeros are determined in associated polynomials P″ and Q″ in cos(m&ohgr;), with each polynomial being a series of Chebyshev polynomials, a search for real zeroes being performed by evaluating the associated polynomials in a series of steps of a real variable u, an approximation of cos(m&ohgr;) as a function of the real variable u being employed.

Abstract: The present invention provides for a method of determining filter coefficients from Line Spectral Frequencies comprising recomputing P(z) and Q(z) polynomials and comprising calculating the &ohgr;&igr;coefficients, characterised by the steps of ordering the polynomials in a series and reducing the number of polynomials in &ohgr;&igr;in the said series by combining the polynomials in &ohgr;&igr;two by two in a manner so as to arrive at two polynomials in &ohgr;&igr;and determining the product of the said two polynomials.

Abstract: The invention provides for a method of calculating Line Spectral Frequencies comprising the steps of determining real zeros in associated polynomials P″ (z) and Q″ (z) in cos (n&ohgr;) and, with each polynomial comprising a series of Chebyshev polynomials, allowing evaluation of a single cos (&ohgr;) per function evaluation and including the steps of introducing the mapping x=cos (&ohgr;) and by approximating the cosine function.

Abstract: In a CELP coder a comparison between a target signal and a plurality of synthetic signals is made. The synthetic signal is derived by filtering a plurality of excitation sequences by a synthesis filter having parameters derived from the target signal. The excitation signal which results in a minimum error between the target signal and the synthetic signal is selected. In order to reduce the complexity of the search for the best excitation signal, thee selection is done in two stages. First a preselection of a small number of excitation sequences is made using a reduced complexity synthesis filter. Thereafter, with this small number of excitation sequences, a full complexity search is made. Due to the reduced number of excitation sequences involved in the final selection the required computational complexity is reduced.

Abstract: A transmission system contains a speech coder which utilizes a pitch detector that is arranged to select a characteristic auxiliary signal portion from the signal to be coded in order to improve the quality of the pitch detection. The pitch is found by searching in the speech signal for signal portions that correspond to the characteristics auxiliary signal portion and by calculating the time difference between the respective signal portions.

Abstract: In a transmission system for a quasi-periodic signal, an encoder (12) transmits to a decoder (28) no more than a single period from a total number of periods of the quasi-periodic signal in encoded form. In this decoder (28) the lacking periods of the quasi-periodic signal are reconstructed by means of interpolation. For obtaining an enhanced quality of the reconstructed signal, a signal segment is transmitted that is representative of two successive periods of the quasi-periodic signal. This signal segment may contain two successive periods, but may also be a signal segment having the length of a single period and being determined by a weighted sum of two successive periods.

Abstract: A digital transmission system wherein only certain of the samples in a series of signal samples are transmitted by the transmitter to a receiver over a channel. In addition, various characteristic parameters of the series of signal samples are determined in the transmitter and transmitted to the receiver. The characteristic parameters are used at the receiver to reconstruct the missing single samples by assigning to them values such that the resulting reconstructed series of signal samples approximates the characteristic parameters as closely possible. If the series has a periodicity having a period longer than the time duration of the series of signal samples, reconstruction of the series may have a considerable interpolation error. By determining such period in the transmitter and transmitting it over the channel to the receiver, where the same periodicity is introduced into the reconstructed series of signal samples, the interpolation error is considerably reduced.

Abstract: For avoiding error propagation as a result of decision feedback equalization, the data to be transmitted are coded with a coder 2 which has a transfer function substantially inverse to the transfer function of the channel 4. Consequently, instantaneous decisions about the received symbol may be made at the receiver 6 without intersymbol interference causing a disturbance. If the channel transfer function differs from the transfer function of the precoder 2, intersymbol interference will again occur, so that the symbol error rate will increase. In order to restrict this increase of the symbol error rate as much as possible, the receiver comprises a cascaded circuit of an adaptive filter 18 which has an inverse transfer function to that of the channel and a decoder 21 which has an inverse transfer function to that of the precoder 2.