Abstract: Method and processing system for measuring the intelligibility of a degraded output signal (Y(t)) from an audio transmission system (10) in response to a reference input signal (X(t)). A measurement device (11) is arranged for outputting a measure (I) for the speech intelligibility of the output signal (Y(t)). The measurement device (11) executes processing of the input signal (X(t)) and output signal (Y(t)) to obtain a disturbance density function (D(f)n). The disturbance density function (D(f)n) is corrected by multiplying it with a correction function for each frame derived from a correlation calculation of the compensated pitch power densities (PPX?(f)n) associated with the input signal (X(t)) of a present frame (n) and an independent previous frame (n?2). The corrected disturbance density function (D?(f)n) is aggregated over frequency and time to obtain a measure (I) for the speech intelligibility of the output signal (Y(t)).

Abstract: The invention relates to a digital video test sequence comprising an intra coded picture (I) and a plurality of predicted pictures (P, B) following said intra coded picture. Each of said intra coded picture and predicted pictures comprises a luminance component (Y) and two chrominance components (Cr, Cb). A variation in at least one of the chrominance components between at least two successive pictures is uncorrelated with a variation in the luminance component between said successive pictures for at least a portion of a display panel on which said pictures are to be displayed. The video test sequence can be used in detecting packet loss for IPTV data connections.

Abstract: Method and processing system for establishing the impact of time response distortion of an input signal which is applied to an audio transmission system (10) having an input and an output. A processor (11) is connected to the audio transmission system (10) for receiving the input signal (X(t)) and the output signal (Y(t)), and the processor (11) is arranged for outputting a time response degradation impact quality score. The processor (11) executes preprocessing of the input signal (X(t)) and output signal (Y(t)) to obtain pitch power densities (PPX(f)n, PPY(f)n) comprising pitch power density values for cells in the frequency (f) and time (n) domain, calculating a pitch power ratio function (PPR(f)n) of the pitch power densities for each cell, and determining a on time response distortion quality score (MOSTD) indicative of the transmission quality of the system (10) from the pitch power ratio function (PPR(f)n).

Abstract: Device and method for measuring a talking quality of a communication link in a communications network (10). The device comprises measurement means (22; 31, 36) connected to the communication link, which are arranged to subject a degraded speech signal s?(t) with respect to a reference speech signal s(t) to an objective measurement technique for measuring a perceptual quality of means are arranged for producing a quality signal (q) which represents an estimated value concerning the talking quality degradation. The degraded speech signal comprises a returned signal r(t). The measurement means (22; 31, 36) are arranged to execute the objective effects in consequence of noise present in the returned signal. The objective measurement technique comprises the determination of a threshold noise level by determining a local minimum value of the degraded speech signal s?(t).