Tritech Microelectronics, Ltd

Other

Vaisala Oy

Timo Husu

Tapani Ritoniemi

Ville Eerola

Eero Pajarre

Seppo Ingalsuo

Tapio Saramaki

Kim Kaisti

Tapio Saram&auml;ki

Jukka Makela

Vesa Karttunen

Timo Saarnimo

The invention relates to a method and an arrangement in a transposed digital FIR filter for multiplying a binary input signal by tap coefficients, and to a method for designing such a filter. The invention comprises a shift register ( ) shifting in the direction of the least significant bit and copying the most significant bit or filling in zero values. The register receives the binary input signal of the filter and has outputs for outputting the content of the desired bit positions. A plurality of bit-serial subtractor and adder elements ( ) multiply the binary input signal by N&plus;1 different tap coefficients by combining output bits of the shift register ( ). The subtractor and/or adder elements form a network wherein at least one element participates in the multiplying operation of at least two different tap coefficients.

Method and arrangement in a transposed digital FIR filter for multiplying a binary input signal with tap coefficients and a method for designing a transposed digital filter

Calculation of a scalar product in a direct-type FIR filter

The invention relates to a method and an apparatus for codeless GPS positioning. According to the method, the unit (2) to be positioned receives GPS signals from several satellites (4), the codes of the GPS signals are removed, and the extracted carrier signals are transmitted out from the unit (2) to be positioned for the purpose of determining the position and/or velocity of said unit (2) to be positioned. According to the invention, the carrier signal frequencies are detected by means of a phase-locked loop and the thus detected signals are transmitted in digital format out from the unit (2) to be positioned for the purpose of further processing.

Codeless GPS positioning method and apparatus for such codeless

Decimation filter

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Joensuu, Finland

Timo Husu