Other

Tritech Microelectronics, Ltd

Vlsi Solution Oy

Fincitec Oy

Nokia Matkapuhelimet Oy

Vaisala Oy

Tapani Ritoniemi

Ville Eerola

Timo Husu

Eero Pajarre

Seppo Ingalsuo

Hannu Tenhunen

Teppo Karema

Toni Liitola

Tapio Saramaki

Kim Kaisti

Pekka Seppä

Sami Kiiskilä

Tapio Saram&auml;ki

Jukka Makela

Vesa Karttunen

Timo Saarnimo

A system for adjusting a response of a loudspeaker system. The system includes a woofer installed in a housing. The woofer includes a woofer cone. A transmitter for transmitting an ultrasonic audio signal towards the woofer cone. A receiver for receiving the ultrasonic audio signal. A detection unit for determining the position of the woofer cone on the basis of a difference between the phase of the reflected ultrasonic audio signal with respect to the ultrasonic audio signal transmitted from the transmitter. A control unit for adjusting a spring constant of the membrane of the loudspeaker system on the basis of the determined position. A method for adjusting a response of a loudspeaker system, to a module to be used in the system. A computer program product including computer code for adjusting a response of the loudspeaker system.

Method and device for detecting a displacement and movement of a sound producing unit of a woofer

Object tracking using ultrasonic signals. A receiver receives a signal transmitted from a transmitter. The receiver uses at least two receiving elements for forming at least two analysis signals on the basis of the received signal. The receiver includes a detector, such as a phase detector, which examines the analysis signals and forms an indication on a difference between the analysis signals. The indication is, for example, indicative of a phase difference between the analysis signals. The transmitted signal is a modulated ultrasonic signal, wherein the receiver demodulates the signal to recover the modulating signal. The indication can be used to determine a heading angle information of the object to be tracked. The heading angle information may be a direction of the object with respect to the transmitter. The heading angle information can be used to make e.g. a corrective action to audio signals to be formed for listening.

Object tracker

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

Cascaded Nth order (N&gt;2) feedforward sigma-delta modulators

The invention relates to a method and an arrangement for stabilizing a high-order sigma-delta modulator comprising at least two integrator stages and a quantizing means. The first, the first two or the first three integrator stages of the high-order modulator form a low-order modulator which is stable at all input signal values. The arrangement comprises a means for resetting the integrator stages following the low-order modulator when the stable operation range of the high-order modulator is exceeded. For an MF modulator the arrangement further comprises a coupling means for decoupling the output of the last integrator of the high-order modulator from the quantizing means and for coupling the output of said low-order modulator to the quantizing means simultaneously with the resetting.

Delta-sigma analog-to-digital converter with overload dependent

The invention relates to a digital sigma-delta modulator for a D/A converter, comprising an integration stage or several cascaded integration stages and a feedback circuit for feedbacking the sign of the output signal of the last integration stage, delayed by one clock cycle and multiplied by a predetermined scaling coefficient, to each integration stage. To avoid limit cycle oscillation, the state of at least the least significant free bit in at least one integration stage is variable at random.

Sigma-delta modulator for a D/A converter with pseudorandom jitter

Growing community of inventors

Tampere, Finland

Tapani Ritoniemi