Fuzhou University

Sigmastar Technology Ltd.

Southeast University

Jie Liu

Zhiyong Ye

Changfa Hu

Yuanyuan Yue

Xiaojun Bao

Haibo Zhu

Xiaoquan Zhang

Pei Yuan

Zhengshuai Bai

Yunbin Zheng

Tinghai Wang

Jianyin Chen

Xueli Wang

Cheng-Wei Zheng

Jingjing Chen

Siting Zeng

Zhijian Huang

Dan Wu

Naixin Wu

Huidong Zheng

Fei-Yang Tong

Jin-Tao Wang

Qingyan Cui

Tinhai Wang

Nangui Lv

Ben Liu

A processing circuit performing a speech enhancement method processes a to-be-processed signal to generate a target signal and executes a plurality of program codes or program instructions to perform the following steps: performing Fourier transform on the to-be-processed signal to generate a spectral signal of the to-be-processed signal; performing a first noise reduction processing on the spectral signal to obtain a first intermediate signal; performing a noise analysis on the first intermediate signal to obtain a noise feature; performing a second noise reduction processing on the first intermediate signal to generate a second intermediate signal when the noise feature does not satisfy a target condition; and performing inverse Fourier transform on the second intermediate signal to generate the target signal. The first noise reduction processing is different from the second noise reduction processing.

Speech enhancement methods and processing circuits performing speech enhancement methods

Point-of-sale terminal

Scan code payment terminal

Cash register base

Cash register

An audio processing apparatus having an echo canceling mechanism is provided. An audio transmission circuit receives an input digital audio signal from an external device. A DAC circuit performs conversion according to the input digital audio signal to generate an output analog audio signal to an external display device for power amplification and playback. An ADC circuit performs analog-to-digital conversion on an amplified signal generated by a power amplification circuit and a received audio signal generated by an audio receiving device to generate an amplified digital signal and a received digital audio signal. A processor implements an echo canceling algorithm to perform echo cancellation according to the amplified digital signal and the received digital audio signal to generate an output digital audio signal to be transmitted to the external device through the audio transmission circuit.

Audio processing apparatus and method having echo canceling mechanism

A catalytic cracking gasoline upgrading method is provided. First, in the presence of a prehydrogenation catalyst, the full-range FCC gasoline undergoes prehydrogenation in a prehydrogenation reactor to remove diolefins, mercaptans and sulfides, and then the prehydrogenation product undergoes selective hydrodesulfurization in the presence of a hydrodesulfurization-isomerization catalyst, and straight-chain olefins are isomerized into single-branched olefins or single-branched alkanes, thus obtaining a low-olefin, ultralow-sulfur and high-octane clean gasoline product.

Catalytic cracking gasoline upgrading method

A catalytic cracking gasoline prehydrogenation method is provided. Thiol etherification and double bond isomerization reactions are carried out on catalytic cracking gasoline through a prehydrogenation reactor. The reaction conditions are as follows: the reaction temperature is between 80&#xb0; C. and 160&#xb0; C., the reaction pressure is between 1 MPa and 5 MPa, the liquid-volume hourly space velocity is from 1 to 10 h, and the hydrogen-oil volume ratio is (3-8):1; a prehydrogenation catalyst comprises a carrier and active ingredients, the carrier contains an aluminium oxide composite carrier with a macroporous structure and one or more of ZSM-5, ZSM-11, ZSM-12, ZSM-35, mordenite, amorphous form aluminum silicon, SAPO-11, MCM-22, a Y molecular sieve and a beta molecular sieve, the surface of the carrier is loaded with one or more of the active ingredients cobalt, molybdenum, nickel and tungsten; based on oxides, the content of the active ingredients is between 0.1% and 15.5%.

Catalytic cracking gasoline prehydrogenation method

The present invention discloses a nickel/titanium oxide-silicon oxide catalyst for synthesizing terpinene-4-ol as well as a preparation method and method of synthesizing terpinene-4-ol using the same. The preparation method includes the steps of catalyst preparation, terpinene-4-ol synthesis and the like are disclosed in the present invention. The preparation method includes the following steps: firstly, preparing a mixed colloid of TiOand SiOby using a sol-gel method, and then centrifuging, washing, drying and roasting is performed to prepare a TiO&#x2014;SiObinary oxide; then, preparing Ni/TiO2-SiO2 by dipping in a nickel nitrate solution, and preparing a supported catalyst by drying and roasting; and finally, adopting a terpinolene-4, 8-epoxide a raw material, carrying out isomerization under the dual catalytic action of TiO2-SiO2 and Ni of the supported catalyst, and carrying out hydrogenation to prepare terpinene-4-ol. The preparation method can combine isomerization and hydrogenation reaction on the same catalyst, has good selectivity on terpinene-4-ol, and is simple to operate and high in product yield.

Nickel/titanium oxide-silicon oxide catalyst for synthesizing terpinene-4-ol, preparation method thereof, and method of synthesizing terpinene-4-ol using the same

A method of preparing a mesoporous Fe&#x2014;Cu&#x2014;SSZ-13 molecular sieve includes activating an aluminum source, a silicon source, an iron source and a copper source respectively; mixing the activated minerals with sodium hydroxide, water and a seed crystal at 25-90&#xb0; C., while controlling feeding amounts of respective raw materials so that molar ratios of respective materials in a synthesis system are as follows: SiO/AlO=10-100, SiO/FeO=30-3000, SiO/CuO=1-100, NaO/SiO=0.1-0.5, HO/SiO=10-50, template/SiO=0.01-0.5; adding an acid source to adjust pH of the system for first aging; and adding the acid source again to adjust the pH of the system for second aging to obtain aged gel; pouring an aged mixture into a kettle; cooling a crystallized product and filtering to remove a liquor; washing a filter cake; drying to obtain a solid; performing ion exchange; and filtering, washing and drying the solid to obtain powder; and placing the powder in a muffle furnace.

Preparation method of mesoporous Fe&#x2014;Cu-SSZ-13 molecular sieve

Growing community of inventors

Fujian, China

Jie Liu