Electrical audio signal processing systems and devices – One-way audio signal program distribution – Public address system
Patent
1990-06-11
1992-07-14
Isen, Forester W.
Electrical audio signal processing systems and devices
One-way audio signal program distribution
Public address system
H04R 2700
Patent
active
051310503
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a device for generating sound in a hall comprising a first space for dancers and/or listeners and an adjacent second space, for instance a catering space. According to the standpoint of technique regarding dance-halls with a band positioned on a band stand the loudspeakers for the music sound as a rule are positioned on the band stand in such a way that the sound from these ones are directed out into the hall, where the dancers and the dinner guests are. In this connection the hall as a rule is designed in that way that the dance-floor is closest to the band stand and the space for those sitting at the tables and having their meals further away from the band stand.
the great disadvantage with loudspeakers on the band stand sending out the strong sound into the hall is that this sound also reaches the place where the dinner guests are sitting. Due to that fact a common conversational tone at the dining tables is made difficult, which is felt annoying by many of those sitting at the tables. Another disadvantage with common dance restaurants is that the strong music sound also rises upwards, and therefore hotel rooms positioned straight about the dance restaurant as a rule have not been able to be rent out.
The German patent 812.258 shows a device where the spoken sound from a speaker at a microphone reaches a certain area D. In order that the spoken sound shall reach further out into the hall a loudspeaker ramp L having several loudspeakers is directed obliquely downwards and outwards into the hall. Due to the fact the sound also reaches the area S. Thus, the intention with this idea is not to limit the sound within a certain area but to lead the sound out into the hall so that it reaches a larger area. Moreover, the patent does not show any sound-ceiling but only a ramp with loudspeakers.
The problems with known technique have been solved by the present invention. The solution comprises a device of the kind mentioned by way of introduction which is characterized in that a sound-ceiling is arranged in the first space in a distance from the floor and that a large number of loud-speakers are arranged in the sound-ceiling.
By this invention the music sound is essentially limited to that area where the dancers are. This has the great advantage that those sitting at the tables beyond the dance floor are not subjected to the strong sound by can converse in a common conversational tone. Due to the special design of the invention, the propagation of the sound upwards is also limited, and therefore also hotels rooms closest to the dance hall vertically can be rent out.
The invention shall be described more closely below, reference being made to the accompanying drawing which schematically shows dancers in one space and dinner guests at a table in an adjacent space.
In this drawing there is shown a band stand 1 and below and in front of this one a space 2 for the dancers. Beyond this space there is a catering space 3 for dinner guests and other sitting at tables for conversation. As a rule it is completely open between the spaces 2 and 3.
The novel and special thing with this invention is that the sound is distributed out via a sound-ceiling 4, which is placed above the heads of the dancers. This sound-ceiling comprises a large number of loudspeakers 5 having a special placing. The sound-ceiling comprises an essentially horizontal plate 6 provided with the loudspeakers, which are retracted in the plate, and further comprises a sound isolating layer 7 placed above the plate, whereby the propagation upwards of the sound is strongly reduced.
According to the invention the special sound-ceiling shall only be arranged in the space for the dancers, the number of loudspeakers and the placing of these ones being arranged in that way that the propagation of the sound is laterally minimized. If many loudspeakers are arranged in the sound-ceiling and the distance between the loudspeakers is limited, there arises something called destructive interference between the sound-waves from the loudspeakers. Thi
REFERENCES:
patent: 3125181 (1964-03-01), Pawlowski
patent: 4672675 (1987-06-01), Powell et al.
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