EP 0667065 A1 19950816 - SWITCHABLE ATTENUATION DEVICE.
Title (en)
SWITCHABLE ATTENUATION DEVICE.
Title (de)
SCHALTBARE DÄMPFUNGSVORRICHTUNG.
Title (fr)
ATTENUATEUR COMMUTABLE.
Publication
Application
Priority
- DE 9300970 W 19931012
- DE 4236408 A 19921028
Abstract (en)
[origin: DE4236408A1] Described is a switchable attenuation device (ES1, ES2) for the selective attenuation of digital signals, having a final control element (MULT) for analyzing the signal values using an attenuation factor (At) that determines the momentary attentuation value, and having a control means (CM) for controlling step-by-step the change in attenuation value within a predetermined turn-on or turn-off time, the control means (CM) having at least one digital filter (DF) which controls the attenuation value change (A1') by filtering a turn-on or turn-off pulse (X). Described also is the use of such attenuation devices as echo attenuating devices in cordless telephones and telephones with handsfree conversing equipment.
IPC 1-7
IPC 8 full level
CPC (source: EP)
H04B 3/20 (2013.01)
Citation (search report)
See references of WO 9410759A1
Designated contracting state (EPC)
BE CH DE DK ES FR GB IT LI NL PT SE
DOCDB simple family (publication)
DE 4236408 A1 19940505; AU 5107193 A 19940524; CA 2147973 A1 19940511; CN 1086358 A 19940504; EP 0667065 A1 19950816; FI 952006 A0 19950427; FI 952006 A 19950427; JP H07508628 A 19950921; WO 9410759 A1 19940511
DOCDB simple family (application)
DE 4236408 A 19921028; AU 5107193 A 19931012; CA 2147973 A 19931012; CN 93119691 A 19931028; DE 9300970 W 19931012; EP 93921819 A 19931012; FI 952006 A 19950427; JP 51053794 A 19931012