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AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsTsuyoshi Kimura, Atsunao Shinoda, Kuniaki Ohsawa
Estimating the term…
To provide a loudspeaker broadcasting system and a loudspeaker broadcasting apparatus which can perform a loudspeaker broadcasting of appropriate contents at each block without reducing sound clearness. Bi-directional speakers 1 which performs sound-reinforcement having high intelligibility, and fire detecting sensors 3 which detect fire occurrence in a tunnel 10a, 10b and send fire occurrence signals are placed in the tunnel 10a, 10b in the tunnel extending direction. In an emergency such as a fire, emergency broadcasting is performed through each bi-directional speaker 1 at each of the predetermined blocks 5 in the tunnel 10a, 10b. The emergency broadcasting is different in contents at each block, and it is alternately performed at the adjacent blocks 5. Further, the frequency components having a long reverberation time is removed from the loudspeaker broadcasting through the bi-directional speaker 1.
A loudspeaker broadcasting system which performs loudspeaker broadcasting in a closed space, comprising:
Dependencies are inferred from the claim text.
From the US filing history. Foreign family members aren’t listed.
Public address systems
Loudspeakers, microphones, gramophone pick-ups or like acoustic electromechanical transducers
Term ended 6 Jul 2023 (estimated)
1. Field of the Invention
The present invention relates to a loudspeaker broadcasting system and a loudspeaker broadcasting apparatus which can precisely transmit, in a closed space such as a tunnel or an underpass where sound is difficult to damp and a reverberation time is long, broadcasting contents such as guide of shelter broadcasted in its space in an emergency.
2. Description of the Related Art
FIG. 1 is a constitutional diagram showing the whole constitution of a loudspeaker broadcasting system according to one embodiment of the invention;
FIG. 2 is a constitutional diagram showing the constitution of a bi-directional speaker provided for the loudspeaker broadcasting system according to the embodiment of the invention;
FIG. 3 is an explanatory view showing a broadcasting timing at each block of the loudspeaker broadcasting system according to the embodiment of the invention; and
An embodiment of the loudspeaker broadcasting system and loudspeaker broadcasting apparatus according to the invention will be described below with reference to drawings in detail.
FIG. 1 is a constitutional diagram showing the whole constitution of a loudspeaker broadcasting system according to one embodiment of the invention. As shown in the figure, the loudspeaker broadcasting system according to the one embodiment comprises a bi-directional speaker 1 corresponding to the speaker in the scope of the patent claim, a fire detecting sensor 3 corresponding to the accident occurrence detecting sensor, a fire detector 311 corresponding to the accident occurrence block detecting unit, a sound source 321, a controller 331 corresponding to the control unit, an automatic broadcasting switcher 341 corresponding to the broadcasting control unit, an equalizer 351, an automatic sound volume adjusting sensor 381 corresponding to the noise condition detecting unit, an automatic sound volume adjuster 361 corresponding to the sound volume adjusting unit, and an amplifier 371. The bi-directional speaker 1, the fire detecting sensor 3 and the automatic sound volume adjusting sensor 381 are provided in a closed space such as a tunnel or an underpass where sound is difficult to damp and the reverberation time is long (hereinafter as an example of the closed space, a tunnel 10 is given.).
In FIG. 1, a case where four bi-directional speakers 1a to 1d, fire detecting sensors 3a to 3d, equalizers 351a to 351d, automatic sound volume adjusters 361a to 361d, amplifiers 371a to 371d, and automatic sound volume adjusting sensor 381a to 381d are provided is exemplarily shown. However, these components are not limited to four sets. Further, in the tunnel 10, a block 5 corresponding to each bi-directional speaker 1 is set. In FIG. 1, four blocks 5a to 5d are set corresponding to the four bi-directional speakers 1a to 1d.