摘要:
Die Erfindung bezieht sich auf ein Verfahren bzw. eine Vorrichtung zum polyphasigen Resampling mit einem Koeffizienten-Generator (11) zum Bereitstellen einer Vielzahl von Koeffizienten (C0, C1, ..., C5) und einer Interpolationsanordnung zum Durchführen des Resamplings mittels der Koeffizienten (C0 - C5) auf Eingangsdaten (Din; Yin, Uin, Vin) zur Bereitstellung dem Resampling unterzogener Ausgangsdaten (Dout; Yout, Uout, Vout). Bevorzugt ist dabei, wenn der Koeffizienten-Generator (11) ausgebildet und/oder angesteuert ist zum Bereitstellen der Koeffizienten (C0 - C5) für das Resampling als linear interpolierte Koeffizienten. Vorteilhaft wird insbesondere, dass eine Vielzahl von zumindest zwei Daten-Interpolationsfiltern zum Interpolieren einer entsprechenden Anzahl von parallelen Eingangsdaten (Yin, Uin, Vin) bereitgestellt ist, wobei die Koeffizienten (C0 - C5) jedem der Daten-Interpolationsfilter angelegt werden.
摘要:
L'invention concerne un procédé de conversion de fréquence d'échantillonnage de rapport prédéterminé entre une fréquence d'entrée ( Fsin ) et de sortie ( Fsout ). Il comprend une phase d'initialisation (40-44) de configuration sélective, en fonction du rapport de conversion, d'un filtre de sous-échantillonnage et d'un filtre passe-bande, et une phase en temps réel comprenant les étapes de sous-échantillonnage sélectif (45), de sur-échantillonnage par un facteur deux et de filtrage passe-bande sélectif (46), de sur-échantillonnage par un facteur soixante-quatre (47) et d'interpolation polynomiale de type "B-Spline" quadratique (48). L'invention concerne aussi un dispositif (4) pour la mise en oeuvre du procédé.
摘要:
The invention relates to an asynchronous sample rate converter (ASRC) for the conversion of the sample rate of digital data such as audio data or video data. In the case of high over-sampling or sub-sampling factors an ASRC becomes quite complex. It is an object of the invention to provide an ASRC with a simplified design for such purposes. It is suggested to use an ASRC which has a n-tap polyphase filter, whereby a computational entity performs a polynomial computation of the filter coefficients. The attenuation at the notch frequencies is best when using a Parzen window or a quadratic window.
摘要:
An ITR (Interpolated Timing Recovery) data reproducing apparatus capable of acquiring an excellent reproduction output waveform with less distortion and updating sampling timing at high speed with a simple configuration is provided. Each sampling period (Ts) of a desired interpolation function f(t) is split into a plurality of periods, linear interpolation is performed for each of the split periods, and data at each interpolation point within each of the split periods is calculated. In addition, only a binary integer representation part is extracted as a quotient obtained by performing integer division of sampling timing for a sampling period, and only input sampling data (Ds) for a number of the binary integer representation part is captured into an interpolation filter to operate a pipeline. Only a binary fraction representation part is extracted as a remainder obtained by performing integer division of the sampling timing for the sampling period, and a tap coefficient of the interpolation filter is determined in accordance with the extracted value, which is used as sampling timing (µk).
摘要:
An oversampling circuit and a digital/analog converter which have small circuit scales and the component costs of which are reduced. The oversampling circuit comprises a multiplying section (1), four data holding sections (2-1 to 2-4), four data selectors (3-1 to 3-4), an adding section (4), and two integrating circuits (5-1, 5-2). Input data is multiplied by four multiplicators by the multiplying section (1), and four multiplication results are held, as one set, in the data holding sections. The data selector reads out the data held in the four data holding sections in a predetermined order and generates step function data. The adding section adds the values of the four step functions outputted from the respective data selectors, and then digital integrating operations corresponding to the sum are carried out by means of two integrating circuits.
摘要:
An oversampling circuit and a digital/analog converter which have small circuit scales and the component costs of which are reduced. The oversampling circuit comprises four D flip-flops (10-1 to 10-4), four multipliers (12-1 to 12-4), three adders (14-1 to 14-3), and two integrating circuits (16-1, 16-2). Input data is fed sequentially to the four D flip-flops and held therein. The multipliers multiply the data held in the respective D flip-flops by different multiplicators in the first half and second half of one clock period, and the multiplication results are added by the three adders. Furthermore, two digital integrating operations corresponding to the sum are carried out by means of the two integrating circuit.
摘要:
A sample rate converter for converting the sampling frequency of an input signal from a first frequency to a second frequency. Such a sample rate converter uses interpolation means and a phase locked loop receiving the first and the second sampling frequency. The invention provides a sample rate converter which uses interpolation means implemented as polynomial interpolation means.