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Machine translation
1. (WO1980000207) PREDICTIVE DIFFERENTIAL PULSE-CODE MODULATION APPARATUS
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/1980/000207    International Application No.:    PCT/GB1979/000105
Publication Date: 07.02.1980 International Filing Date: 27.06.1979
IPC:
H03M 3/04 (2006.01), H04N 11/04 (2006.01)
Applicants:
Inventors:
Priority Data:
7828071 27.06.1978 GB
Title (EN) PREDICTIVE DIFFERENTIAL PULSE-CODE MODULATION APPARATUS
(FR) APPAREIL DE MODULATION DIFFERENTIELLE IMPULSION-CODE DE PREDICTION
Abstract: front page image
(EN)Predictive differential pulse-code modulation apparatus provided with one or more predictors (71, 72) for predicting the value of incoming data samples (S1), e.g. derived from a television signal, on the basis of a number of previously received data samples. A differential signal is produced which is the difference between the prediction and the incoming data sample, this differential signal being quantised into a signal having a lesser number of bits to the differential signal. The quantised signal is transmitted and reception apparatus includes a restorer for restoring the quantised signal into its original differential form, and a further predictor identical to that in the transmitter for combining an identical prediction with the restored signal to provide a reception signal substantially identical to that fed to the transmitter. The predictors (71, 72) may be responsive to the second preceding and earlier samples. Predictions are preferably based on previous samples within the same line, in the case of a television signal, but can also be based on samples from preceding lines, and/or preceding fields.
(FR)Un appareil de modulation differentielle a impulsions - code de prediction comprend un ou plusieurs predicteurs (71, 72) pour predire la valeur d"echantillons de donnees d"entree (S1, par exemple derives d"un signal de television, sur la base d"un nombre d"echantillons de donnees recues anterieurement. Un signal differentiel est produit representant la difference entre la prediction et l"echantillon de donnees entre, ce signal differentiel etant quantifie en un signal ayant un nombre de bits inferieur a celui du signal differentiel. Le signal quantifie est transmis et un appareil de reception comprend un dispositif pour retablir le signal quantifie dans sa forme differentielle d"origine, et un autre predicteur identique a celui se trouvant dans les emetteurs pour combiner une prediction identique avec le signal retabli de maniere a obtenir un signal de reception sensiblement identique a celui qui est envoye a l"emetteur. Les predicteurs (71, 72) peuvent etre sensibles aux echantillons precedant en second lieu et aux echantillons anterieurs. Les predictions se basent de preference sur des echantillons anterieurs dans la meme ligne, dans le cas d"un signal de television, mais peuvent aussi se baser sur des echantillons d"une ligne precedente, et/ou des champs precedents.
Designated States:
Publication Language: English (EN)
Filing Language: English (EN)