U.S. Philips Corporation

Martinus P Van Den Thillart

Joris A Nieuwendijk

Johannes W Bax

Henricus H Roelofs

Wilhelmus H Evers

Dirk De Boe

Johannes A Das

Cornelis J Oepkes

Raoul E Keereman

A television receiver has a subwoofer box situated inside the cabinet of the television receiver. The subwoofer box has a loudspeaker arranged in a chamber and mounted in such a manner that it is situated outside the space enclosed by the subwoofer box. The chamber is dimensioned so as to accommodate the loudspeaker. This enables the volume of the subwoofer box to be optimized in view of the space available inside the cabinet of the television receiver. Moreover, mounting of the loudspeaker and the wiring thereof is simplified considerably.

Apparatus including a loudspeaker unit, loudspeaker unit, and housing

An enclosure (35) of a loudspeaker (37) is provided with a plurality of tubes (43) of different length via which the sound is emitted in order to achieve frequency spreading of resonance peaks in the SPL (sound pressure level) curve. The side walls (46, 47) of the tubes (43) have openings (63) via which the tubes are coupled to common Helmholtz resonators (59, 61) in order to suppress undesirable resonances in the tubes (43). By spreading the resonance peaks it is possible to use Helmholtz resonators of smaller dimensions than in the case that the sound would emanate via a single tube. This results in a loudspeaker system (33) with more compact and cheaper Helmholtz resonators (59, 61).

Loudspeaker system

An audio or video apparatus has a housing, a loud-speaker and an acoustic channel. The loud-speaker acoustically cooperates with the channel. One end of the channel opens into an aperture in a side of the apparatus. The dimensions of the loud-speaker and acoustic channel and the positioning thereof within the housing are chosen so as to provide an apparatus that is compact and at the same time produces improved audio reproduction.

Audio or video apparatus with a built-in loudspeaker

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Eindhoven, Netherlands

Martinus P Van Den Thillart