公开(公告)号：EP1443461B1

公开(公告)日：2006-11-02

申请号：EP03002205.7

申请日：2003-01-31

Applicant: STMicroelectronics S.r.l.

Inventor： Barone, Massimiliano ,  Vitali, Andrea ,  Pau, Danilo Pietro ,  Sirtori, Daniele ,  Lavigna, Daniele ,  Gardella, Pierluigi

IPC: G06T9/00

CPC classification number: G06T9/005

公开(公告)号：EP1443461A1

公开(公告)日：2004-08-04

申请号：EP03002205.7

申请日：2003-01-31

Applicant: STMicroelectronics S.r.l.

Inventor： Barone, Massimiliano ,  Vitali, Andrea ,  Pau, Danilo Pietro ,  Sirtori, Daniele ,  Lavigna, Daniele ,  Gardella, Pierluigi

IPC: G06T9/00

CPC classification number: G06T9/005

Abstract: A method for texture compressing images having a plurality of color components (R, G, B) includes the step of defining color representatives for use in encoding by defining groups of colors for each said color component (R,G,B), and selecting for each said group a representative color for the group, the median color being chosen as the representative color of the group. Each said group is preferably composed of 3 to 15 colors and the method includes the step of computing, for each group, an error between each member of the group and said representative color of the group. Typically, the error is computed as the sum of the absolute differences (SAD) between each member of the group and said representative color of the group. In order to select each said group and then extract therefrom said representative color, a criterium is used selected from the group consisting of:

selecting the group that minimizes said error by assuming each group comprised of the lower colors sorted in ascending order, wherein the same applies for the groups comprised of the higher colors,
accruing the error as computed separately for two groups in all possible combinations and finding the minimum of the composite error.

Abstract translation: 用于纹理压缩具有多个颜色分量（R，G，B）的图像的方法包括通过为每个所述颜色分量（R，G，B）定义颜色组来定义用于编码的颜色代表的步骤，以及选择 对于每个所述组，该组的代表颜色，中间颜色被选择为该组的代表颜色。 每个所述组优选地由3至15种颜色组成，并且该方法包括以下步骤：针对每个组计算组的每个成员与组的所述代表颜色之间的误差。 通常，误差被计算为组的每个成员与组的所述代表颜色之间的绝对差（SAD）之和。 为了选择每个所述组，然后从其中提取所述代表性颜色，使用选自以下的标准：选择通过假设由按升序排列的较低颜色组成的每个组，使所述误差最小化的组，其中相同 适用于由较高颜色组成的组，在所有可能的组合中分别计算出两组的误差，并找出复合误差的最小值。

公开(公告)号：EP1058451B1

公开(公告)日：2006-07-19

申请号：EP99830330.9

申请日：1999-05-31

Applicant: STMicroelectronics S.r.l.

Inventor： Della Torre, Luigi ,  Ronchi, Marco ,  Vitali, Andrea

IPC: H04N5/455 ,  H03D1/22

CPC classification number: H03D1/00 ,  H04N5/455 ,  H04N21/4382

公开(公告)号：EP1058451A1

公开(公告)日：2000-12-06

申请号：EP99830330.9

申请日：1999-05-31

Applicant: STMicroelectronics S.r.l.

Inventor： Della Torre, Luigi ,  Ronchi, Marco ,  Vitali, Andrea

IPC: H04N5/455

CPC classification number: H03D1/00 ,  H04N5/455 ,  H04N21/4382

Abstract: A digital AM demodulator, particularly for demodulating a signal (x) originating from a tuner, comprising:

means (13) for generating a first carrier (ω a t) which is not correlated with the input signal (x) to be demodulated;
first means (3) for multiplying the first carrier (ω a t) by the input signal (x) to be demodulated;
filtering means (1, 2), arranged upstream and downstream of said multiplier means (3) and adapted to eliminate unwanted spectral repeats;
the particularity of which is the fact that it comprises means (15) for detecting the phase shift between the pulse (ω i ) of the input signal (x) to be demodulated and a local carrier (ω o t) and means (18) for correlating the first carrier with the input signal, the first carrier and the local carrier being mutually correlated, the local carrier not being correlated with the input signal to be demodulated.

Abstract translation: 一种数字AM解调器，特别是用于解调来自调谐器的信号（x），包括：用于产生与要解调的输入信号（x）不相关的第一载波（ω）的装置（13） 第一装置（3），用于将第一载波（ωa）乘以待解调的输入信号（x）; 滤波装置（1,2），布置在所述乘法器装置（3）的上游和下游，并适于消除不需要的频谱重复; 其特征在于它包括用于检测要被解调的输入信号（x）的脉冲（ωi）与本地载波（ω）之间的相移的装置（15）和用于 将第一载波与输入信号相关，第一载波和本地载波相互相关，本地载波不与要解调的输入信号相关。

公开(公告)号：EP1058451B9

公开(公告)日：2006-10-25

申请号：EP99830330.9

申请日：1999-05-31

Applicant: STMicroelectronics S.r.l.

Inventor： Della Torre, Luigi ,  Ronchi, Marco ,  Vitali, Andrea

IPC: H04N5/455 ,  H03D1/22

CPC classification number: H03D1/00 ,  H04N5/455 ,  H04N21/4382

公开(公告)号：EP1217724A1

公开(公告)日：2002-06-26

申请号：EP00830838.9

申请日：2000-12-21

Applicant: STMicroelectronics S.r.l.

Inventor： Ronchi, Marco ,  Della Torre, Luigi ,  Zambotti, Paolo ,  Vitali, Andrea

IPC: H03D3/00

CPC classification number: H03D3/007

Abstract: A digital demodulator for angle-modulated (PM, FM) signals comprises:

an input module (1, 2) for generating, starting from the modulated signal (s fm ), a first component (cosφ(n)) and a second component (sinφ(n)) in quadrature with respect to one another, said components in quadrature being representative of the real part and of the imaginary part of the modulating signal (s'(t); s"(t)) represented as a complex variable; and
a processing module (4) able to generate an output signal, calculating the arctangent function of the ratio between said imaginary part and said real part, the output signal identifying the demodulated signal (s'(t); s"(t)).

The processing module (4) acts on the components in quadrature either directly, in the case of phase demodulation, or indirectly, in the case of frequency demodulation. In the latter case, the above-mentioned real component and imaginary component are calculated, respectively, as the sum of the products of each of the components in quadrature with a corresponding delayed version, and as the difference of the cross products of each of the two components in quadrature with a version delayed in time of the other component in quadrature.
The demodulator may be implemented either as a dedicated hardware unit, or else resorting to a computer program product for DSP or microprocessor.

Abstract translation: 用于角度调制（PM，FM）信号的数字解调器包括：输入模块（1,2），用于从调制信号（sfm）开始产生第一分量（cosφ（n））和第二分量 sin（n））相互正交，所述正交分量表示调制信号的实部和虚部（s'（t）; s“（t）），表示为复数 变量;以及处理模块（4），其能够产生输出信号，计算所述虚部与所述实部之间的比值的反正切函数，所述输出信号识别解调信号（s'（t）; s“（t ））。 在频率解调的情况下，处理模块（4）在相位解调的情况下直接作用在正交的部件上。 在后一种情况下，分别计算上述实数分量和虚分量作为正交的每个分量的乘积与对应的延迟版本的和的总和，以及作为每个 正交的两个组件，其中正交的另一个组件的时间延迟版本。 解调器可以被实现为专用硬件单元，或者采用用于DSP或微处理器的计算机程序产品。