Method for creating a system clock in a receiver device and corresponding receiver device
First Claim
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1. A method for synchronizing a counter in a receiving device for digital data streams, comprising:
- generating the digital data streams in a transmitting device by sampling analog signals at a sampling frequency synchronized by a system time clock in the transmitting device;
determining the sampling frequency of one of the data streams in the receiving device;
synchronizing the counter with the determined sampling frequency of the one of the data streams;
setting an increment of the counter; and
determining the increment from a ratio between a program clock reference and the sampling frequency, whereinthe determining the sampling frequency of the one of the data streams in the receiving device is without the transmitter transmitting a value of the system time clock; and
the frequency of the system time clock in the transmitting device is not the same as the sampling frequency.
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Abstract
According to a method for generating a system time clock in a receiving device for digital packetized elementary data streams (E), the packetized elementary data streams (E) being generated in a transmitting device by sampling at a sampling frequency (fsample) synchronized by a system time clock of the transmitting device, the sampling frequency (fsample) of one data stream is determined in the receiving device, and the program clock reference counter is synchronized with the data stream'"'"'s sampling frequency.
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15 Claims
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1. A method for synchronizing a counter in a receiving device for digital data streams, comprising:
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generating the digital data streams in a transmitting device by sampling analog signals at a sampling frequency synchronized by a system time clock in the transmitting device; determining the sampling frequency of one of the data streams in the receiving device; synchronizing the counter with the determined sampling frequency of the one of the data streams; setting an increment of the counter; and determining the increment from a ratio between a program clock reference and the sampling frequency, wherein the determining the sampling frequency of the one of the data streams in the receiving device is without the transmitter transmitting a value of the system time clock; and the frequency of the system time clock in the transmitting device is not the same as the sampling frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A receiving device, comprising:
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a transport data stream demultiplexer for demultiplexing a transport data stream into packetized elementary data streams and for extracting flags that identify a presentation time stamp for the purpose of initializing a counter; a unit for correctly determining a sampling frequency of one of the packetized elementary data streams; an output control unit for synchronizing data streams obtained from the packetized elementary data streams; and a synchronization unit for synchronizing the counter according to the sampling frequency, wherein the determining the sampling frequency of the one of the packetized elementary data stream is without a transmitter transmitting a value of the system time clock; wherein the synchronization unit sets an increment of the counter, the increment being determined from a ration between a program clock reference and a nominal sampling frequency. - View Dependent Claims (11, 12, 13, 14, 15)
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Specification