Monitoring audio fidelity and audio-video synchronization

摘要

Methods, systems, and computer programs for monitoring quality of audio delivered over a communications channel are presented. One method includes an operation for defining timestamps. The timestamps are associated with a measure of time while delivering audio to a client computer, where each timestamp includes a plurality of timestamp bits. Further, the method includes an operation for modulating an audio signal with pseudo noise (PN) codes when a timestamp bit has a first logical value, and modulating the audio signal with a negative of the PN codes when the timestamp bit has a second logical value. After transmitting the modulated audio signal to the client computer, the timestamp bits are extracted from a received modulated audio signal to obtain received timestamps. The quality of the audio is assessed based on the received timestamps, and the quality of the audio is stored in computer memory.

主权项

1. A method for monitoring quality of audio delivered over a communications channel, the method comprising:
defining a sequence of two or more timestamps, the timestamps being associated with a measure of time progress while delivering audio to a client computer, each timestamp including a plurality of timestamp bits; modulating an audio signal with the sequence of two or more timestamps, the modulating being with pseudo noise (PN) codes when a timestamp bit has a first logical value, and modulating the audio signal with a negative of the PN codes when the timestamp bit has a second logical value; transmitting the modulated audio signal to the client computer; extracting the timestamp bits from the received modulated audio signal to obtain two or more received timestamps; determining a quality value of the audio based on the two or more received timestamps; and storing the quality value of the audio in computer memory.