A DAB receiver channel decoder

A Coded Orthogonal Frequency Division Multiplex (COFDM) cannel decoding apparatus in which the frequency deinterleaving (or bit deinterleaving or symbol deinterleaving) step is merged with the bit-reversing step of the Fast Fourier Transform (FFT) processor (block 1). The combined function may also be combined with certain demodulation function (DQPSK or QAM) (Figure 6). The hardware/software arrangement of the COFDM decoder is simplified and has reduced memory requirements for storing intermediate results. In contrast to conventional arrangements (Figure 1) wherein the decoder performs the steps in the order of FFT processing the demodulation then deinterleaving the proposed arrangement performs FFT processing then deinterleaving before demodulation. The arrangement may be used for example in DAB, DVB-T, DVB-H or DRM systems.

Design method of COFDM channel decoder

The invention relates to an orthogonal frequency division modulation (COFDM) decoder, in particular to a design method of a frequency convolutional de-interleaver in the COFDM decoder, which combines the frequency de-interleave or sign de-interleave or bit de-interleave with an FFT processor in the data processing flow of the COFDM decoder, and changes the traditional method of placing on the back of DQPSK/QAM or any other modal of a modem into the method of placing in the front of the modem. The frequency or sign or bit de-interleave, FFT bit modem and reading sequence of the modem are combined integrally to obtain an address sequence which is collated independently on the basis of the frame of the COFDM decoder, which can be realized in the process of reading out data of the modem. The invention simplifies hardware and software which are demanded in the frame of the COFDM decoder, and reduces the capacity of a data register which is demanded in the process of storing intermediate object ...

Means for implementing a DAB receiver channel decoder

Huffman decoder using modified Huffman Code Table

This invention proposes a Huffman Code Table (HCT) transform and a parallel Huffman decoding method based on this transformed HCT. The transformation of the HCT reorders the rows of the original HCT so that the codes are arranged in an ascending or descending order, and partitions it into a number of sub-bands, each respective sub-band containing codes of the same length. Two kinds of modification, namely bit removal or bit stuffing, may also be made to the reordered codes in the HCT in order to reduce the number of sub-bands of the reordered HCT. Incoming data is compared to threshold values for each sub-band to determine the correct sub-band for the data, and the correct entry for the incoming data is then found using the sub-band number and an offset code in each sub-band.

A decoding method for electronic program guidance of a digital multimedia broadcast receiver

The invention discloses a method for decoding an electronic program guide of a digital multimedia broadcast receiver. The method comprises the steps as follows: firstly, a signal of a digital multimedia broadcast enters into the RF module of the digital multimedia broadcast receiver to be converted into an intermediate-frequency signal; secondly, the intermediate-frequency signal is treated with A/D conversion to become an intermediate-frequency digital signal which is then sent into a baseband decoding module for carrying out channel decoding and audio decoding, meanwhile, the baseband decoding module sends information in a fast information channel into a processor to be treated with software decoding; thirdly, the software decoding is carried out; fourthly, decoded electronic program guide data is sent to a display device.

Production method of fine denier hollow polyester staple fiber

The invention provides a production method for fine denier hollow polyester staple fiber. The spinneret hole of the spinneret is a single opening C-shaped circle, the spinning temperature is 288-292 DEG C, the circular air blow speed is 0.8-1.3 m/s and the air blow temperature is 17-23 DEG C. The 0.8 dt-1.5 dt fine denier hollow polyester staple fiber is obtained by processing adopting the process route of conventional polyester staple fiber. The invention has the advantages of stable production process and high product closing success rate. The titer and modulus of fiber are decreased further on the precondition of ensuring physical properties of the fiber such as higher hollowness, excellent fracture strength and elongation at break, thus improving the flexibility of fiber and soft feeling of fabric effectively and meeting the market demand for further fine denier of hollow polyester staple fiber.

Production method of fine denier hollow polyester staple fiber

The invention provides a production method for fine denier hollow polyester staple fiber. The spinneret hole of the spinneret is a single opening C-shaped circle, the spinning temperature is 288-292 DEG C, the circular air blow speed is 0.8-1.3 m/s and the air blow temperature is 17-23 DEG C. The 0.8 dt-1.5 dt fine denier hollow polyester staple fiber is obtained by processing adopting the process route of conventional polyester staple fiber. The invention has the advantages of stable production process and high product closing success rate. The titer and modulus of fiber are decreased further on the precondition of ensuring physical properties of the fiber such as higher hollowness, excellent fracture strength and elongation at break, thus improving the flexibility of fiber and soft feeling of fabric effectively and meeting the market demand for further fine denier of hollow polyester staple fiber.

SURFACE TREATMENT METHOD OF SEMICONDUCTOR DIRECT BONDING

... 用于半导体片直接键合的表面处理方法，采用等离子体表面处理，不仅可以增加半导体表面的ＯＨ浓度，而且可以增加表面层内原子活性，从而显著增大键合强度。本方法可以在半导体表面生长绝缘层的同时完成，操作方便，成本低，便于在批量生产中应用。 ...