| 摘要 |
The invention relates to echo elimination in a subscriber line circuit having digital signal processing. Echo elimination is effected with the aid of a digital balance filter which is connected in an interface where the sampling frequency, e.g. 16 kHz, is higher than the original sampling frequency, e.g. 8 kHz, of transmitted signals. The requisite size of the balance filter can be reduced by sampling the filter at the same frequency, e.g. 8 of kHz, as the original sampling frequency of the transmitted signals. |
