METHOD FOR SYNCHRONIZING THE REPLAY OF A DIGITAL SIGNAL TRANSMITTED FROM A SENDER TO A PLURALITY OF MOBILE AUDIO TERMINALS
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Abstract
A method for synchronizing the reproduction of a digital signal sent by a transmitter to a plurality of mobile audio terminals. The transmitter sends the digital signal as a multiplicity of data packets at a data rate that is constant as an average over time. A signal receiver of each mobile audio terminal receives at least a subset of the multiplicity of data packets and generates a time reference signal. A FIFO signal with information on an occupancy level of a FIFO memory of the mobile audio terminal at specific time points is generated, an instantaneous reproduction speed is set on the basis of the time reference signal and the FIFO signal, the audio reproduction unit reproduces at the instantaneous reproduction speed samples corresponding to the digital signal. The occupancy level of the FIFO memory is thereby kept constant as an average over time.
3 Citations
20 Claims
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1-10. -10. (canceled)
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11. A method for synchronizing a reproduction of a digital signal sent from a transmitter to a plurality of mobile audio terminals, wherein each of the mobile audio terminals has a signal receiver, a First-In-First-Out memory connected to the signal receiver and an audio reproduction unit connected to the FIFO memory, the method comprising:
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sending the digital signal from the transmitter as a multiplicity of data packets at a data rate that is constant as an average over time; each mobile audio terminal in each case; receiving with the signal receiver at least a subset of the multiplicity of data packets; generating with the signal receiver a time reference signal from the received data packets; generating from the FIFO memory a FIFO signal containing information on an occupancy level of the First-In-First-Out memory at specific time points; setting an instantaneous reproduction speed on a basis of the time reference signal and the FIFO signal; reproducing with the audio reproduction unit at the instantaneous reproduction speed samples corresponding to the digital signal; and thereby keeping constant the occupancy level of the FIFO memory as an average over time. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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12. The method according 11, which comprises:
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combining with the transmitter respective groups of data packets into temporal frames; wherein each frame has a time pattern containing a transmission time and a quiet time; transmitting all the data packets in a frame during the transmission time; and wherein the quiet time in each frame is longer than a time gap between any two data packets. - View Dependent Claims (13)
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Specification