Method for controlling a digital television metrology equipment

Equipment for measuring the quality of digital television signals comprising a data stream organized in frames, the equipment comprising:

• an identifier device (MPCR) receiving the data stream as input and outputting a reference time signal (PCR) selected from said data stream;
• a clock generator (SSTC) whose phase is locked on the basis of said reference time signal (PCR) and outputting a multibit clock signal (MTS) operating at a given frequency and whose count is deduced unambiguously from the count of a time base (STC) generated during the initial encoding of the digital video signals;
• a sampler (ECH) receiving on a first input at least one bit of said multibit clock signal (MTS) and on a second input an analog video frame synchronizing signal (STV) present at the output from a data stream decoder (DEC), and outputting on each occurrence of said analog video frame synchronizing signal (STV) a signal representing the updated value at least the at least one bit of the multibit clock signal (NTS);
• a measurement device (EMES) receiving as input said updated value signal and generating as a consequence a signal (MSTC) for triggering measurements.