Speech transmission between terminals in different networks
First Claim
1. System for speech transmission between two pieces of terminal equipment, of which the first terminal equipment is a mobile station which is connected to a mobile telephone network through a radio link and the speech coder of which produces speech frames containing speech parameters, and the second terminal equipment is connected to a fixed network,whereinthe fixed network is a data network conveys data packets and the second terminal equipment having telephone characteristics transmits and receives data packets in accordance with the protocol of the network in question,the second terminal equipment has a speech coder in accordance with the mobile station system which synthesizes the original speech from the speech parameters sent by the mobile station contained in the data packets arriving from the data network and produces speech parameters for location in outgoing data packets,the speech parameters are relayed as such between the terminal equipment without doing any further coding on them.
4 Assignments
0 Petitions
Accused Products
Abstract
The invention concerns a system, which allows speech transmission between a mobile station and terminal equipment connected to a data network. The terminal equipment, preferably an Internet telephone, sends and receives data packets in accordance with the protocol of the data network in question and is provided with telephone characteristics. It has a speech coder in accordance with the mobile station system which synthesises the original speech from the speech parameters sent by the mobile station and contained in the data packets arriving from the data network and which correspondingly produces speech parameters for location in outgoing data packets. The speech parameters are conveyedas such between the mobile station and the terminal equipment without applying any additional coding to them. When the mobile telephone network is a packet switched network, it may be connected directly to the data network or, when the mobile telephone network is a circuit switched network, a gateway is used, which performs any necessary conversions, so that the call can be connected from one network to the other.
89 Citations
10 Claims
-
1. System for speech transmission between two pieces of terminal equipment, of which the first terminal equipment is a mobile station which is connected to a mobile telephone network through a radio link and the speech coder of which produces speech frames containing speech parameters, and the second terminal equipment is connected to a fixed network,
wherein the fixed network is a data network conveys data packets and the second terminal equipment having telephone characteristics transmits and receives data packets in accordance with the protocol of the network in question, the second terminal equipment has a speech coder in accordance with the mobile station system which synthesizes the original speech from the speech parameters sent by the mobile station contained in the data packets arriving from the data network and produces speech parameters for location in outgoing data packets, the speech parameters are relayed as such between the terminal equipment without doing any further coding on them.
Specification