发明名称 |
SWITCHABLE ATTENUATION DEVICE |
摘要 |
A description is given of a switchable attenuation device (ES1, ES2) for optionally attenuating digital signals, having a control means (MULT) for evaluating the signal values by means of an attenuation factor (At) determining the instantaneous attenuation value, and having a control means (CM) for step-by-step control of the change in attenuation value within a prescribed turn-on or turn-off time. According to the invention, the control means (CM) contains at least one digital filter (DF) which controls the changes (Al') in the attenuation value by filtering a turn-on or turn-off pulse (X). In addition, the use of such attenuation devices as an echo attenuation device in cordless telephones and telephones with the hands-free set is described.
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申请公布号 |
CA2147973(A1) |
申请公布日期 |
1994.05.11 |
申请号 |
CA19932147973 |
申请日期 |
1993.10.12 |
申请人 |
SIEMENS AKTIENGESELLSCHAFT |
发明人 |
TELGES, BURKHARD;LUCIONI, GONZALO |
分类号 |
H04M1/60;H04B3/20;(IPC1-7):H04B3/20;H03G3/00;H04M1/74 |
主分类号 |
H04M1/60 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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