G - Physics – 10 – L
Patent
G - Physics
10
L
G10L 19/00 (2006.01) G10L 21/02 (2006.01) G10L 19/04 (2006.01)
Patent
CA 2248891
The present invention relates to a method and an arrangement for reconstruction of a received speech signal (r), which has been transmitted over a radio channel that has been subjected to disturbances, such as e.g. noise, interference or fading. A speech signal (rrec), where the effects from these disturbances are minimised, is generated by an estimated speech signal (r), corresponding to expected future values of the received speech signal (r), being produced according to a linear predictive reconstruction model in a signal modelling circuit (500). The received speech signal (r) and the estimated speech signal (r) are combined in a signal combination circuit (600) according to a variable ratio, which is determined by a quality parameter (q). The quality parameter (q) may be based on measured power level of a received radio signal, an estimate of a received power level of the desired radio signal in proportion to an interfering radio signal or a bit error rate signal or bad frame indicator alternatively, which has been calculated from a data signal that has been transmitted via a certain radio channel and which represents the received speech signal.
La présente invention concerne un procédé et un dispositif de reconstitution d'un signal vocal reçu (r), qui a été émis via un canal radio ayant subi des perturbations telles que du bruit, des parasites ou de l'atténuation. Le procédé consiste à générer un signal vocal (r¿rec?) dans lequel on a minimisé les effets de ces perturbations. Cette génération se fait en utilisant un signal vocal (r) correspondant aux valeurs futures attendues pour le signal vocal reçu (r) et produit selon un modèle prédictif linéaire de reconstitution par une logique de mise en forme du signal (500). Le procédé consiste ensuite à combiner le signal vocal reçu (r) et le signal vocal estimé (r) dans un combinateur (600) utilisant un taux variable régi par un paramètre de qualité (q). Ce paramètre de qualité (q) peut résulter du rapport entre d'une part le niveau de puissance mesuré d'un signal radio reçu ou une estimation de niveau de puissance reçu du signal radio reçu et d'autre part un signal radio parasite ou, suivant le cas, un signal de taux d'erreur binaire ou un indicateur de trame erronée qui a été calculé à partir d'un signal de données qui a été émis via un certain canal radio et qui est représentatif du signal vocal reçu.
Brighenti Daniel
Ekudden Erik
Marks & Clerk
Telefonaktiebolaget Lm Ericsson
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