Yutou Technology (hangzhou) Co., Ltd.

Hangzhou Dianzi University

Peng Gao

Zhiqun Cheng

Zhen Wang

Ruoyu He

Xin Liu

Lichun Fan

Jiaqi Shi

Fan Lichun

Peng Cai

Meng Meng

Mingjun Cai

An impedance matching method for a low-profile ultra-wideband array antenna is provided. The method includes: connecting an arm of a balanced end of a hyperbolic microstrip balun in series with an open circuit line; directly coupling the open circuit line to a radiator layer; connecting another arm of the balanced end of the hyperbolic microstrip balun to the radiator layer via a metallized via hole, and welding an unbalanced end of the hyperbolic microstrip balun to a coaxial line, so that the coaxial line feeds a power to the antenna via the hyperbolic microstrip balun. In this method, the open circuit line is integrated between the hyperbolic microstrip balun and the radiator layer of the antenna to achieve an impedance matching of the ultra-wideband antenna and to simplify a structure of a matching circuit.

Impedance matching method for low-profile ultra-wideband array antenna

A microstrip ultra-wideband antenna is provided, including: an upper dielectric substrate, a radiation patch, an open-circuit line, a short-circuit line, a ground plane, a lower dielectric substrate, a vertical dielectric substrate, isolation walls, a hyperbolic microstrip balun feeder and an ideal wave port. The radiation patch is attached to a lower surface of the upper dielectric substrate; the ground plane is attached to an upper surface of the lower dielectric substrate; the short-circuit line and the open-circuit line are attached to a rear surface and a front surface of the vertical dielectric substrate respectively; the hyperbolic microstrip balun feeder is attached to the front and rear surface of the vertical dielectric substrate; the isolation walls are located between the upper dielectric substrate and the lower dielectric substrate perpendicularly to an end of the radiation patch; and the ideal wave port is provided below the hyperbolic microstrip balun feeder.

Microstrip ultra-wideband antenna

The present disclosure provides a multi-band base station antenna for scattering suppression, including a high-band dual-polarized antenna and a low-band dual-polarized antenna. The operating band of the high-band dual-polarized antenna is 1.7-3.0 GHz, which are four; the operating band of the low-band dual-polarized antenna operates is 0.69-0.96 GHz, and is comprised of two intersected dipoles; above the high-band dual-polarized antennas, a spacing between the high-band dual-polarized antenna and the low-band dual-polarized antenna is smaller than the quarter wavelength corresponding to the low-band dual-polarized antenna; the low-band dual-polarized antenna is provided with several rectangular open slots at equal spacings, with symmetrical openings on both sides of the dipole, with a width of 1-1.5 mm and a length of 4-to 6 mm; and a ratio of the sum of widths of the open slots to a length of an arm of the dipole is greater than 0.16 and less than 0.24.

Multi-band base station antenna for scattering suppression

The invention discloses a multi-language mixed speech recognition method, which belongs to the technical field of speech recognition; the method comprises: step S, configuring a multi-language mixed dictionary including a plurality of different languages; step S, performing training according to the multi-language mixed dictionary and multi-language speech data including a plurality of different languages to form an acoustic recognition model; step S, performing training according to multi-language text corpus including a plurality of different languages to form a language recognition model; step S, forming the speech recognition system by using the multi-language mixed dictionary, the acoustic recognition model and the language recognition model; and subsequently, recognizing mixed speech by using the speech recognition system, and outputting a corresponding recognition result. The above technical solution has the beneficial effects of being able to support the recognition of mixed speech in multiple languages, improving the accuracy and efficiency of recognition, and thus improving the performance of the speech recognition system.

Multi-language mixed speech recognition method

Provided is a system for a robot to eliminate its own sound source, comprising a sound pickup unit () used for acquiring a digital signal having mixed left and right sound channels and outputting same; a sound-card driver unit () used for mixing the received reference signal of the robot sound source and the digital signal having mixed left and right sound channels, to form a mixed voice signal, and outputting same; a signal separation unit () used for separating the mixed voice signal into a digital signal having mixed left and right sound channels and a reference signal, and determining whether the digital signal having the mixed left and right sound channels contains an interference signal, obtaining a playback signal volume, and outputting same.

System for robot to eliminate own sound source

A robot voice direction-seeking turning system and method. The robot voice direction-seeking turning system employs a voice activity detection unit () that detects a received voice signal to determine whether or not a voice signal transmitted by a user (S) is present; a direction-seeking angle for the voice signal is calculated by a voice direction-seeking unit (), and a voice direction-seeking turning unit () is employed to drive a robot to turn towards the direction of the sound source of the voice signal on the basis of a direction-seeking angle (S). Employment of the robot voice direction-seeking turning method allows accurate acquisition of a valid voice signal transmitted by the user, thus increasing signal-to-noise ratio and the accuracy of voice recognition.

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Hangzhou, China

Peng Gao