Thomson Licensing

Mario Sieck

Markus Schlosser

Ulrich Schreiber

Peter Steinborn

A circuit for correcting the output of an audio level meter comprises input means for generating the square or the absolute value of an input signal, a low pass filter having a predetermined attack time and release time, and output means for converting the output signal from a linear scale to a logarithmic scale. The circuit further comprises a correction means to which an information about whether the input signal to the audio level meter was subject to squaring or converting into an absolute value at the input, as well as the attack and release time of the low pass filter, are supplied as input values, and which provides, at its output, a value representing the difference between the output of the audio level meter and the true signal power of the input signal.

Audio level meter

A synchronisation of the presentation or reproduction of video data with audio data is described, which data each are processed on two non-synchronised computers. An MPEG-type stream is separated into video data and audio data, wherein the video data is processed utilising the first processing means and the audio data is timestamped and forwarded to the second processing means which compares the received time-stamp to the local time. The transmission time periods of sending audio data packets from the first processing means to the second processing means are calculated based on the local system time and timestamp is inserted into the audio data packets. Subsequently, synchronised audio and video presentation or reproduction is performed.

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Isernhagen NB, Germany

Mario Sieck