MULTIMEDIA CONTENT BROADCAST PROCEDURE

1 . A procedure for broadcasting of multimedia digital content to subscribers, the method comprises

reception in a customer device of a first transport stream of digital data broadcast from a header source through a first telecommunications network differing from a telecommunications network based on an IP internet protocol to subscribers;

playing in the subscriber's audiovisual receiver of the desired content recovered by a decoding unit and supplied to a first storage unit connected to the receiver;

wherein the method additionally comprises

broadcasting from a first channel change unit of a first channel change message to a second channel change unit comprised in a service application unit connectable to a customer device through a second telecommunications network based on an IP internet protocol, in response to a channel change message received by the first channel change unit;

broadcasting of a second digital data stream associated with the channel selected by the customer, which begins in a key frame, corresponding to the audiovisual content of the desired channel, stored in a second storage unit comprised in a service application unit as response to the reception of a first channel change message.

2 . Procedure in accordance with claim 1 wherein it also comprises play in the audiovisual receiver of the desired channel content decoded by a decoding unit from the second data stream received.

3 . Procedure in accordance with claim 1 wherein it comprises in addition storage in the second storage unit of the server of the first digital data stream diffused from the header source through the first telecommunications network.

4 . Procedure in accordance with claim 2 wherein it also comprises a conclusion of the decoding of the second data stream by the decoding unit when the first change unit identifies that the data packages of the second stream coincide with data packages of the first data stream stored in the first buffer.

5 . A customer device receives a first digital data stream transmitted from a header source through a first telecommunications network differing from a telecommunications network based on an IP internet protocol, wherein it comprises a first channel change unit which is adapted to transmit a first channel change message to a second channel change unit comprised in a server application unit connectable to the customer device through a second telecommunications network based on an IP internet protocol in response to a channel change message received by the first channel change unit.

6 . A device in accordance with claim 4 wherein a coder which is adapted to receive a second digital data stream associated with a desired channel content, including at least the final key frame stored in a second storage unit comprised in a service application unit, in response to the reception of the first channel change message in the second channel change unit.

7 . A device in accordance with claim 5 wherein the decoder is adapted to decode the second data stream received and supply the decoded content of the desired channel to the subscriber's audiovisual receiver.

8 . Device in accordance with claim 6 wherein it is adapted to conclude decoding of the second data stream by the decoding unit when the first change unit identifies that the data packages of the second stream coincide with data packages of the first data stream stored in the first buffer.

9 . Device in accordance with claim 6 wherein the decoder is adapted to decode data packages of the first data stream stored in a first buffer after the first channel change unit has identified that the data packages of the second stream coincide with data packages of the first data stream stored in the first buffer.

10 . A service application unit receives a first digital data stream transmitted from a header source through a first telecommunications network differing from a telecommunications network based on an internet protocol or IP wherein it comprises a second channel change unit which is adapted to receive a second telecommunications network based on an IP internet protocol from a first channel change unit comprised in a customer device in response to a channel change message received by the first channel change unit.

11 . Application unit in accordance with claim 9 wherein the application unit is adapted to transmit a second digital data stream associated with the customer's desired channel content, including at least the final key frame stored in a second storage unit comprised in a service application unit, as response to the reception of the first channel change message.

12 . Application unit in accordance with claim 10 wherein the second storage unit is adapted to store the first digital data stream diffused from the header source through the first telecommunications network.

13 . Application unit in accordance with claim 10 wherein the service application unit is adapted to stop transmitting the second data stream when the first change unit identifies that the data packages of the second stream coincide with data packages of the first data stream stored in the first buffer.

14 . A computer programme may be loaded in an internal computer memory with entry and outlet units and a processing unit, where the computer programme comprises executable codes configured to carry out the transmission procedure for multimedia digital content in response to a second channel change request message received in a second channel change unit, supplying a second digital data stream associated with the customer's selected channel, which comprises at least the last key frame corresponding to the desired channel and stored in a third storage unit comprised in a service application unit, in accordance with claim 1 .