Method and arrangement for adding a new speech encoding method t

Details Method and arrangement for adding a new speech encoding method t Method and arrangement for adding a new speech encoding method t

1998-10-09

2000-12-12

Smits, TaI.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704270, G10L 1900, H04B 1402

Patent

active

061610852

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The invention relates to an arrangement for introducing a new, more advanced speech encoding method into a digital, speech transmitting telecommunications system.


DISCUSSION OF RELATED ART

A known method of selecting, for example, the speech encoding algorithm to be used is to agree on the speech encoding and signaling based on the basis of a standard or other such agreement. A new speech code (coder-decoder) can be arranged in an existing system afterwards, if the action has been anticipated in some way. In the field of telecommunications systems, however, no methods are known by which a new speech encoding method could be added to a existing system without making any changes in the standard or other agreement.
Based on the above introduction, the object of the invention is to provide a signaling method by which, for example, a new speech code can be introduced into an existing telecommunications system. The invention seeks to solve the problem that arises when the introduction of a new speech codec has not been ag reed upon and when a signaling system by which the communicating transceivers could select the method to be used does not exist. This is the situation, for example, with a GSM full rate channel.
The method of the invention thus has to solve two separate problems: (1) The new codec must operate on an existing channel. The transfer rate of a speech encoding method on a GSM full rate channel is 13 kbit/s. A solution to the problem is presented in Finnish Patent Application No. 943,302, entitled `Method and equipment for transmitting speech in a telecommunications system` (Jarvinen et al.). It is thus possible to apply a lower rate speech encoding method to this same channel. (2) When there are two possible speech codecs, how do two pieces of communication equipment select a method they both will use? Normally, the problem is solved by agreeing on signaling. However in unexpected situations, this is not possible. The problem is discussed in Finnish Patent Application No. 955,266. this application also discusses a signaling method that can be used in connection with the present invention.
An object of the invention is to develop a method and equipment implementing the method to solve the above problems.


SUMMARY OF THE INVENTION

The basic idea of the invention is that the speech codec to be used is selected by communication between transceivers on a speech channel. The method makes it possible, for example, to introduce into a GSM system, a better quality speech codec specific to the manufacturer, whereby the speech codec concerned i s only used when equipment of a specified manufacturer are communicating with each other. When the equipment communicate with equipment of other manufacturers, a standard GSM speech codec is used.
The procedure according to the invention is described as follows. Let us assume that both an `old` (known to all) and a `new` (known to new equipments) speech encoding method have been implemented in the communicating equipment. At the beginning of each speech connection, the old speech encoding method is used, since it is impossible to know for certain whether the new method has been implemented in the equipment used at the other end. A handover corresponds to the start of a connection because the network transceiver may change. The message transmission method according to the above-mentioned patent application (Haavisto) discusses how to initiate a dialogue between the transceivers to find out whether a new speech encoding method is used in both equipment. If so, then the equipment proceeds to use it.
The advantage of the method and system according to the invention is that although a new speech encoding method is introduced, the equipment previously used in the system can continue to use the old speech encoding method. The advantage is achieved so that an `old` type receiver, which cannot interpret the bit patterns intended as messages, processes them as if they were normal speech frames. Since the speech frames that correspond to messages have

REFERENCES:
patent: 4476559 (1984-10-01), Brolin et al.
patent: 5768613 (1998-06-01), Asghar
patent: 5822360 (1998-10-01), Lee et al.
Patent Abstract of Japan, JP 7030947, Jan. 31, 1995.
Patent Abstract of Japan, JP 6006295, Jan. 14, 1994.

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