EP 1481484 A1 20041201 - SUPERHETERODYNE CIRCUIT WITH BAND-PASS FILTER FOR CHANNEL SELECTION
Title (en)
SUPERHETERODYNE CIRCUIT WITH BAND-PASS FILTER FOR CHANNEL SELECTION
Title (de)
SUPERHETERODYNSCHALTUNG MIT BANDPASSFILTER FÜR DIE KANALAUSWAHL
Title (fr)
CIRCUIT SUPERHETERODYNE A FILTRE PASSE-BANDE DE SÉLECTION DE CANAL
Publication
Application
Priority
- FR 0300586 W 20030221
- FR 0202658 A 20020301
Abstract (en)
[origin: WO03075474A1] The invention concerns a superheterodyne circuit comprising at least one reception input (5), at least one production output (6) wherefrom can be produced a baseband signal and at least one band-pass filter (8) for channel selection interposed in the signal path (7) between the input (5) and the output (6). The invention is characterized in that the filter (8) is adapted to be connected to means (38) for measuring a characteristic frequency of signal passage in said filter (8), controllable means (22, 23) for frequency shift are arranged in the signal path (7), and control means (40) are provided, connected to the measuring means (38) and controlling the means (22, 23) with a supplementary signal, which compensates the difference of the measured characteristic frequency relative to a prescribed characteristic frequency value of the filter passage (8) and whereof the frequency is determined based on the position of said path (7) of the shifting means (22, 23) relative to the filter (8).
IPC 1-7
IPC 8 full level
H03J 7/02 (2006.01); H04B 1/26 (2006.01); H04B 1/28 (2006.01)
CPC (source: EP US)
Citation (search report)
See references of WO 03075474A1
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT SE SI SK TR
DOCDB simple family (publication)
WO 03075474 A1 20030912; AU 2003224213 A1 20030916; EP 1481484 A1 20041201; FR 2836765 A1 20030905; FR 2836765 B1 20040709; JP 2005519517 A 20050630; US 2006166639 A1 20060727
DOCDB simple family (application)
FR 0300586 W 20030221; AU 2003224213 A 20030221; EP 03720635 A 20030221; FR 0202658 A 20020301; JP 2003573795 A 20030221; US 50616305 A 20050726