Electrical audio signal processing systems and devices – Noise or distortion suppression – Interpolation
Patent
1989-12-20
1992-06-02
Isen, Forester W.
Electrical audio signal processing systems and devices
Noise or distortion suppression
Interpolation
381188, 381205, H04R 102
Patent
active
051194295
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an audio installation, in particular stereophonic, for television sets with a large built-in low-frequency loudspeaker.
Present day aesthetic considerations with regard to television sets, in particular television sets with large and almost flat screens, demand cabinets which have, on each side of the cathode ray tube "audio columns" which are very narrow. Now it is known that in order to correctly reproduce the low frequencies of the audio spectrum, it is necessary to use large loudspeakers, preferably circular or elliptical loudspeakers. Such loudspeakers cannot be housed in these narrow audio columns. This problem is currently solved either by using low-frequency loudspeakers which are too small or which have a very elongated shape, or by connecting external loudspeakers housed in baffles which are independent of the television set. For stereophonic reproduction it is therefore necessary to use two such baffles
An object of the present invention is an audio installation, in particular a stereophonic audio installation for a television set, using a large loudspeaker for the reproduction of low frequencies, which loudspeaker is disposed in the cabinet of the television set.
The audio installation according to the invention comprises, in addition to the loudspeakers for reproducing the high frequencies of the audio spectrum, which are normally fixed to the front panel of the television set, at least one loudspeaker for the reproduction of low frequencies which is disposed in the cabinet of the television set, in its rear section, and associated with an enclosure opening on one side of the front panel of the television set. Preferably this enclosure is filled with a sound-absorbing product such as glass wool Advantageously, the rear cover and the internal surfaces of the cabinet which are not occupied by the enclosure are lined with sound-absorbing product.
The present invention will be better understood on reading the following detailed description of two embodiments, taken as non-limitative examples and illustrated by the appended drawing in which:
FIG. 1 is a front view of a television set according to the invention without the decorative front panel grids,
FIG. 2 is a plan view in cross-section along II--II in FIG. 1, and
FIG. 3 is view similar to that of FIG. 2 of another embodiment of a television set according to the invention.
The television set shown in the drawing is of the type having a cabinet having, on the front panel 1, two "audio columns" 2, 3, extending over the entire height of the front panel and over a narrow width of about 10 cm. In present day television sets of known type, the front panel includes, for each audio column, a cut-out for a loudspeaker for reproducing high frequencies (known as a "tweeter") and a loudspeaker for the reproduction of the low frequencies and the medium frequencies of the audio spectrum. Because of the very narrow width of the columns, the low- and medium-frequencies loudspeaker can only be of mediocre quality.
The audio installation according to the invention comprises a loudspeaker 4 of large size (for example having a diameter of at least 10 cm) capable of correctly reproducing, in particular, the low frequencies of the audio spectrum (starting from about 30 Hz). This loudspeaker 1 is fixed in the rear section of the cabinet 5 of the television set.
According to the embodiment shown in FIG. 2, the loudspeaker 4 is fixed to the rear of the acoustic enclosure 6, about half way up the vertical height of the television set This enclosure 6 is produced from a material currently used for producing acoustic enclosures, such as a compound of wood particles or of loaded plastic, of appropriate thickness (a thickness of at least about 10 mm) The enclosure 6 extends over almost the entire height of the television set cabinet Its shape is adapted to the space remaining between the cathode ray tube 7 and one of the sides of the cabinet 5. In the drawing, the enclosure is disposed in the right hand section of the cabinet, but it is of co
REFERENCES:
patent: 3086078 (1963-04-01), Sharma
patent: 3523589 (1970-08-01), Vivra
patent: 4128738 (1978-12-01), Gallery
Isen Forester W.
Plottel Roland
Societe Electronique de la Region Pays de Loire
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