| 摘要 |
The present invention is an ADSL encoder and decoder. Wherein, the ADSL encoder comprises a digital signal processor, a buffer, a bit extractor and a constellation point mapper. The digital signal processor delivers data bits to the buffer, and again the delivered data bits are transmitted to the bit extractor by buffer. Bit extractor shifts partial received data bits to an extracted data. The constellation point mapper processes constellation point mapping operation corresponding to the extracted data based on transmitted bits that a sub-carrier can transmit. The ADSL decoder comprises a constellation decoder, a bit packet component and a buffer. The constellation decoder combines a horizontal axis data and a vertical axis data to packed data depending on constellation decoding procedures. The bit packet component stores extracted data to digital data in sequence, and the digital data is stored by buffer in sequence as well, then transmitted to digital signal processor.
|
