Receiving apparatus and transmitting/receiving method

Abstract

According to one embodiment, there is provided a receiving apparatus including an interface section which receives a TTS (Transport stream with Time Stamp) packet via a network, a TTS packet buffer section which temporarily stores the TTS packet, a clock section which counts a clock signal, a monitor adjustment section which time-evaluates the TTS packet, and then, controls a clock speed of the clock section in accordance with the time evaluation, a decoding section which decodes the TTS packet in response to the clock signal, and then, outputs a TS packet, and an MPEG decoding section which MPEG-decodes the TS packet supplied from the TTS decoder.

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

A general architecture that implements the various feature of the invention will now be described with reference to the drawings. The drawings and the associated descriptions are provided to illustrate embodiments of the invention and not to limit the scope of the invention.

FIG. 1 is s block diagram depicting an example of a configuration of an IP broadcast time synchronization system according to an embodiment of the present invention;

FIG. 2 is a model chart showing an example of feedback control of an IP broadcast time synchronization system according to an embodiment of the present invention;

FIG. 3 is an explanatory view showing an example of numeric value simulation in the case where a clock of an IP broadcast time synchronization system according to an embodiment of the present invention is earlier by 25 ppm;

FIG. 4 is an explanatory view showing an example of numeric value simulation in the case where a clock of an IP broadcast time synchronization system according to an embodiment of the present invention is delayed by 25 ppm;

FIG. 5 is a model chart showing an example of feedback control of an IP broadcast time synchronization system according to an embodiment of the present invention;

FIG. 6 is an explanatory view showing an example of numeric value simulation in the case where a clock of an IP broadcast time synchronization system according to an embodiment of the present invention is earlier by 25 ppm;

FIG. 7 is an explanatory view showing an example of numeric value simulation in the case where a clock of an IP broadcast time synchronization system according to an embodiment of the present invention is delayed by 25 ppm; and

FIG. 8 is a flowchart showing an example of clock synchronization procedures in an IP broadcast time synchronization system according to an embodiment of the present invention.

Claims

1. A receiving apparatus comprising: an interface section which receives a TTS (Transport stream with Time Stamp) packet via a network;a TTS packet buffer section which temporarily stores the TTS packet;a clock section which counts a clock signal;a monitor adjustment section which time-evaluates the TTS packet, and then, controls a clock speed of the clock section in accordance with the time evaluation;a decoding section which decodes the TTS packet in response to the clock signal, and then, outputs a TS packet; andan MPEG decoding section which MPEG-decodes the TS packet supplied from the TTS decoder.

2. The receiving apparatus according to claim 1, wherein initial setting of the clock is set to be slower than a clock at a transmitting side over the network;

3. The receiving apparatus according to claim 1, wherein the monitor adjustment section detects an increasing or decreasing tendency of time evaluation of the TTS packet as well as time evaluation of the TTS packet, and then, controls a clock speed of the clock section in response to the detection.

4. The receiving apparatus according to claim 1, further comprising: a tuner section which supplies to the MPEG decoding section a voice/video image signal obtained by demodulating an external broadcast signal;a display device which displays on a screen a voice/video image signal outputted from the MPEG decoding section; anda speaker section which reproduces a voice signal outputted from the MPEG decoding section.

5. The receiving apparatus according to claim 1, wherein the monitor adjustment section carries out the time evaluation based on a time stamp of the TTS packet.

6. The receiving apparatus according to claim 1, wherein the monitor adjustment section carries out the time evaluation by calculating a difference between first and last time stamps in the TTS packet buffer section.

7. A transmitting/receiving method between a transmitting apparatus and a receiving apparatus via a network, the method comprising: transmitting a TTS (Transport stream with Time Stamp) packet from the transmitting apparatus via the network;receiving the TTS packet via the network;temporarily storing the TTS packet in a TTS packet buffer section;time-evaluating the TTS packet, and then, controlling a clock speed in accordance with the time evaluation;decoding the TTS packet in response to the clock signal, and then, outputting a TS packet; andMPED-decoding the TS packet supplied from the TTS decoder.

8. The transmitting/receiving method according to claim 7, wherein initial setting of the clock is set to be slower than a clock at a transmitting side over the network.

9. The transmitting/receiving method according to claim 7, wherein an increasing or decreasing tendency of time evaluation of the TTS packet as well as time evaluation of the TTS packet is detected, and then, a clock speed of the clock section is controlled in response to the detection.

10. The transmitting/receiving method according to claim 7, wherein, in the receiving apparatus, there is further provided: a tuner section which supplies to an MPEG decoding section a voice/video image signal obtained by demodulating an external broadcast signal;a display device which displays on a screen a voice/video image signal outputted from the MPEG decoding section; anda speaker section which reproduces a voice signal outputted from the MPEG decoding section.

11. The transmitting/receiving method according to claim 7, wherein the time evaluation is carried out based on a time stamp of the TTS packet.

12. The transmitting/receiving method according to claim 7, wherein the time evaluation is carried out by calculating a difference between first and last time stamps in the TTS packet buffer section.