Data processing: speech signal processing – linguistics – language – Speech signal processing – For storage or transmission
Patent
1997-01-31
2000-10-17
Hudspeth, David R.
Data processing: speech signal processing, linguistics, language
Speech signal processing
For storage or transmission
714747, G06F 1120
Patent
active
061345229
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a signal processing method and apparatus for block-coded audio signals of a communication system.
Transmitting and receiving devices are used for message processing and transmission in communications systems having a message transmission path between a message origin and a message destination. The message produced by the message origin is transmitted by the transmitting device via a message channel to the receiving device, which subsequently emits the received message to the message destination. The message processing and transmission can in this case be carried out in a preferred transmission direction or in both transmission directions (duplex operation).
"Message" is a generic term which represents both the meaning content (information) and the physical representation (signal). Signals may represent, for example, normally characterized by continuous (analog) signals, while non-continuous signals (for example pulses, digital signals) are normally produced for the type of transmission according to (4).
The present invention primarily relates to the transmission of audio messages (for example voice or music messages, etc.). However, it can also be applied to other messages, such as appropriately processed video messages, for example.
Either continuous signals (pure analog signals) or a mixture of continuous and non-continuous signals occur as possible signal forms for an audio communications system, using A/D (analog to digital) converters and D/A (digital to analog) converters. Devices which are specific to the message type are in each case required for the functions of "transmitting" and "receiving". The question as to which of these devices is finally used also depends, inter alia, on the communications channel which is used as the basis for the audio communications system. The present invention thus primarily relates to telecommunications systems, which have a wire-free telecommunications channel. Telecommunications systems having such a structure are, for example, cordless telephones to the DECT standard (Digital European Cordless Telecommunication; cf. (1) European Telecommunication Standard; prETS 300 175-1 . . . 9, October 1992, Parts 1 to 9, ETS-Institute 06921 Sofia Antipoles, France; (2) Nachrichtentechnik Elektronik 42 (Telecommunications Electronics 42) (January/February 1992), No. 1, Berlin; U. Pilger: "Struktur des DECT-Standards" (Structure of the DECT Standard); pages 23 to 29; (3) Philips Telecommunication Review: "DECT, Universal Cordless Access System"; Vol. 49, No. 3, September 1991, pages 68 to 73) or mobile radio telephones to the GSM standard (Groupe Speciale Mobile Systems for Mobile Communication; cf. Informatik Spektrum (Information Spectrum), Springer Press Berlin, Year 14, 1991, No. 3, pages 137 to 152, "Der GSM-Standard--Grundlage fur digitale europaische Mobilfunknetze" (The GSM Standard Basis for digital European mobile radio networks)).
The DECT cordless telephone and the GSM mobile radio telephone are audio communications systems in which block-coded audio signals--for example signals which are coded using the TDMA or CDMA method (Time Division Multiple Access or Code Division Multiple Access)--are processed. The message transmitted using these telephones as a rule comprises, according to the above definition of message types, a mixture of continuous and non-continuous signals. This signal mixture is in this case produced by the use of analog/digital and digital/analog converters.
FIG. 1 shows a DECT cordless telephone having a cordless base station FT (Fixed Termination) to which a maximum of twelve cordless mobile sections (PT1 . . . PT12 (Portable Termination) are assigned for cordless telecommunication via a radio channel FK. Cordless base stations designed in such a way have been introduced to the market using the product name "Gigaset 952"--cf. DE-Z: the German journal Funkschau December 1993, pages 24 and 25; "Digitale Freiheit--Gigaset 952: Das erste DECT-Telefon" (Digital freedom--Gigaset 952: The first DECT te
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Hudspeth David R.
Siemens Aktiengesellschaft
Zintel Harold
LandOfFree
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