H.u.c. Elektronik Gmbh

Feelbelt Gmbh

H.u.c. Elektronik Hansen & Co.

First Sensor Ag

Jens Hansen

A method and a device for increasing the perception of acoustic events, particularly for increasing musical sensitivity. As high a correlation as possible between heard and felt perceptions can be achieved by the conversion of the musical signal into vibrations on the skin, the local impact distribution of the filtered musical signals, the emphasis of the dominant musical signals by expanding the extent of the impact, the transfer of the signal portions in the non-feelable range into the feelable range, and the variable base spectrum adapting to the current musical spectrum.

Method and device for increasing musical sensitivity

FM receiver which detects and responds to receiving and interference

FM receiver with muting circuit

FM receiver

An FM receiver includes an IF unit followed by an LF unit, the IF unit having an IF filter arrangement. The center frequency of the IF filter arrangement, which is relatively narrowbanded with respect to the channel bandwidth, is controlled as a function of the receiving conditions. The receiver has circuitry for changing the signal transmission characteristic of the IF and/or LF unit, including a detector module with detector circuits for detecting values characteristic of receiving or interference states, with the inputs of these circuits each being connected with a circuit point of the IF or LF unit carrying the signal to be processed and with the outputs of these circuits providing signals characterizing receiving or interference states. The circuitry for changing the signal transmission characteristic also includes an evaluation circuit for processing the signals characteristic of receiving or interference states, the evaluation circuit having an input portion with at least one amplitude and/or time threshold circuit connected with the detector module and having a logic unit which is connected to the input portion and which provides processed signals characteristic of receiving and interference states as control signals for influencing individual stages of the IF or LF unit.

Arrangement having tracking IF filter

FM receiver having variable IF filter

Intermediate frequency signals are produced by mixing with an oscillator voltage and subsequently filtered and demodulated. The oscillator voltage or the resonance frequency of the filter or filters are followed up by a control voltage derived from the demodulated signal corresponding to the intermediate frequency. The perturbatory phase modulator occurring as a result of the control lag is compensated by opposite-phase phase-modulation which is superimposed on the intermediate frequency. In this, the phase modulation is achieved by a phase modulator which is connected with the output of a demodulator by a matching circuit. Another possibility for achieving phase modulation of the intermeidate frequency is to modulate the oscillator of the mixing stage.

Filter and demodulation circuit for filtering an intermediate frequency

Method and circuit for converting frequency-modulated signals through at

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Berlin, Germany

Jens Hansen