JP4272896B2 - Broadcast equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a broadcasting apparatus, and more particularly to a broadcasting apparatus that broadcasts different contents to a plurality of broadcasting areas, and these broadcasting areas are adjacent to each other.
[0002]
[Prior art]
For example, different contents may be broadcast to a plurality of adjacent broadcast areas. If there is an overlapping part in these broadcast areas, both broadcasts are mixed in this overlapping part, and at least one of the broadcasts may not be clearly heard.
[0003]
In order to improve this point, conventionally, for example, it is conceivable to provide a difference in sound quality between a sound source for one broadcast area and a sound source for the other broadcast area. For example, broadcasting is performed with a male voice for one broadcasting area, and broadcasting with a female voice is performed on the other broadcasting area. Since male and female voices have different frequency components, one voice is not erased by the other voice in the overlapping region.
[0004]
Alternatively, it is conceivable to narrow the overlapping broadcast area to the minimum by broadcasting with a narrow directivity speaker.
[0005]
Alternatively, it is also conceivable to reduce the leakage of broadcast sound to unnecessary portions by using a large number of low-volume speakers as broadcast speakers for each broadcast area.
[0006]
[Problems to be solved by the invention]
However, in the technique of providing a sound quality difference between sound sources, a sound source based on a male voice and a sound source based on a female voice must be prepared separately. For this reason, male and female voice actors must be arranged at the time of creating the sound source, and furthermore, both the recording work and the recording / playback medium for each must be prepared. As a result, the initial cost and the maintenance cost increase.
[0007]
In the technique using a narrow directivity speaker, the narrow directivity speaker is expensive and the broadcasting apparatus is also expensive. Furthermore, the narrow directivity speaker is large in size and has a complicated mounting direction, and the mounting position is limited.
[0008]
The technique of providing a large number of speakers with a small volume cannot be used unless an environment in which a large number of speakers can be installed. For example, there is no problem if the speaker can be embedded in the ceiling as in a normal room, but there is no place to install the speaker because there is no ceiling, and the aesthetics are impaired by the installation of the speaker. This technique is not suitable when there are inconveniences. In particular, when the ceiling is high, even if a speaker is embedded, the sound is output at a low volume, so that a sufficient sound pressure cannot be obtained.
[0009]
It is an object of the present invention to provide a broadcasting apparatus that can reduce initial costs and maintenance costs and can be sufficiently improved in clarity and can be implemented in any environment.
[0010]
[Means for Solving the Problems]
The broadcasting device according to the present invention has a plurality of speakers. The plurality of speakers emit sound to the corresponding broadcast area, but some of these broadcast areas overlap. An audible frequency signal is supplied from the sound source to each speaker. The audible frequency signal may be an audio signal or a sound such as a buzzer or chime. These audible frequency signals have the same sound quality, but are different for each broadcast area. It is assumed that the sound source can simultaneously supply an audible frequency signal to each speaker. Frequency characteristic adjusting means is provided between each speaker and the sound source. The frequency characteristic adjusting means is set to different frequency characteristics in which the sound ranges through which the audible frequency signals pass are different from each other . For example, when two speakers are provided and frequency characteristic adjusting means are provided for each of them, if one frequency characteristic adjusting means is set to output a high sound range, the other frequency characteristic adjusting means is , Set to output the bass range. For example, when three speakers are provided and frequency characteristic adjusting means are provided for each of them, one frequency characteristic adjusting means outputs a high sound range, and the other outputs a low sound range. The remaining one is set to output midrange. Each frequency characteristic adjusting means can be provided in the preceding stage when a power amplifier that supplies an audible frequency signal amplified to each speaker is provided. Alternatively, each frequency characteristic adjusting means can be provided with each speaker. In this case, if a power amplifier is provided, each frequency characteristic adjusting means is provided between each power amplifier and each speaker.
[0011]
In the broadcasting apparatus configured in this manner, audible frequency signals having the same sound quality and different contents are adjusted to different frequency characteristics by the frequency characteristic adjusting means, and then amplified from the corresponding speakers. Therefore, even if sound of an audible frequency is simultaneously emitted from the speaker to the adjacent portion of the broadcasting area of each speaker, these frequency characteristics are different. Therefore, the person in this adjacent part can distinguish these sounds clearly.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
The broadcasting apparatus according to the first embodiment of the present invention is used, for example, for in-station broadcasting at a station as shown in FIG. One of the longitudinal edges of the platform 2 of the station is the upside 2U, and the other is the downside 2D. A support column 4 is provided in the center of the platform 2. The support column 4 is provided with two speakers 6U and 6D. The speaker 6U is for emitting sound to the upstream side 2U. The speaker 6D is for emitting sound to the downstream side 6D. The speaker 6U has directivity for emitting sound in a broadcast area as indicated by reference numeral 8U. The speaker 6D has directivity for emitting sound in a broadcast area as indicated by reference numeral 8D. These broadcast areas 8U and 8D are adjacent to each other at the center of the platform 2 and partially overlap. Therefore, if sound of the same sound quality is simultaneously emitted to the broadcast areas 6U and 6D at the same volume, a person existing in the overlapping area of the broadcast areas 8U and 8D cannot recognize the contents of both sounds. Further, when one volume is larger than the other, only a loud sound is heard.
[0013]
Therefore, as shown in FIG. 1, the amplifiers 10U and 10D that supply audible frequency signals, for example, audio signals to the speakers 6U and 6D are provided with frequency characteristic adjusting means, for example, equalizers 12U and 12D. The amplifier 10U is supplied with an audible frequency signal for upstream broadcasting, for example, an audio signal for upstream broadcasting, from the sound source 14, and an audible frequency signal for downstream broadcasting, for example, an audio signal for downstream broadcasting, is supplied from the sound source 14 to the amplifier 10D. Have been supplied. The sound source 14 is capable of dual output for simultaneously and separately outputting the upstream broadcast audio signal and the downstream broadcast audio signal to the amplifier 10U belonging to the upstream broadcast system and the amplifier 10D belonging to the downstream broadcast system. It is. These audible frequency signals for upstream and downstream broadcasts have the same sound quality, for example, one voice actor previously recorded on a recording medium for upstream and downstream broadcasts.
[0014]
In the amplifiers 10U and 10D, the input uplink and downlink broadcast audio signals are amplified by the pre-stage amplifiers 16U and 16D, then amplified by the power amplifiers 18U and 18D, and supplied to the speakers 6U and 6D. An equalizer 12U is provided between the power amplifier 18U and the front-stage amplifier 16U, and similarly, an equalizer 12D is provided between the power amplifier 18D and the front-stage amplifier 16D.
[0015]
The frequency characteristics of the equalizers 12U and 12D are set differently. For example, as indicated by the symbol U in FIG. 2, the frequency characteristic of the equalizer 12U is such that the high sound range when the frequency band reproducible by the speakers 6U and 6D and the power amplifiers 18U and 18D is divided into a high sound region and a low sound region The cut low frequency component of the upstream broadcast audio signal is output from the equalizer 12U to the power amplifier 18U. As indicated by the symbol D, the frequency characteristic of the equalizer 12D is that the low frequency range is cut, the high frequency range of the audio signal for downlink broadcasting is cut, and the high frequency component of the audio signal for downlink broadcasting is , And output from the equalizer 12D to the power amplifier 18D.
[0016]
Even when the upstream and downstream broadcast audio signals having the same sound quality are supplied from the sound source 14 to the amplifiers 10U and 10D, the sound quality of the upstream and downstream broadcast audio signals emitted from the speakers 6U and 6D is equalized by the equalizers 12U and 12D. It is different depending on the existence of. Therefore, a person who is present in the overlapping portion of the broadcast areas 8U and 8D that receive sound from both speakers 6U and 6D can clearly distinguish both sounds even if broadcast is simultaneously performed from both speakers 6U and 6D. . Moreover, one speaker is used for each of the broadcast areas 8U and 8D. Therefore, the configuration is simple, and it can be easily installed in any environment. Moreover, since the same sound quality can be used for the upstream and downstream audio signals from the sound source 14, it is easy to create a recording / reproducing medium, and the initial cost and maintenance cost can be reduced. .
[0017]
In the broadcasting apparatus of the first embodiment, the upstream broadcast audio signal from the sound source 14 is always supplied to the amplifier 10U, and the downstream broadcast audio signal is always supplied to the amplifier 10D. Therefore, the equalizers 12U and 12D can be provided in the amplifiers 10U and 10D. For example, when it is necessary to supply audio signals having the same contents to the speakers 6U and 6D at the same time, or when there are audio signals having contents commonly used for uplink and downlink, as shown in FIG. An audio frequency signal is supplied to one of the amplifiers 10a and 10b, for example, the amplifier 10a, and after being amplified there, is supplied to the speaker 6U or 6D or both selected by the selection means, for example, the matrix circuit 20. Reference numeral 22 indicates a control circuit of the matrix circuit 20. In the case of using such a matrix circuit 20, the speakers to which the output signals of the amplifiers 10a and 10b are supplied are not constant. Therefore, in the second embodiment, as shown in FIG. 4, equalizers 12U and 12D are provided on the input sides of the speakers 6U and 6D. Of course, the frequency characteristics of the equalizers 12U and 12D are different from each other as in the first embodiment. As a result, the frequency characteristics of the sound broadcast to the broadcast areas 8U and 8D are different, and both sounds can be clearly distinguished even in the overlapping areas of the broadcast areas 8U and 8D.
[0018]
In each of the above embodiments, the broadcasting device of the present invention is implemented in a broadcasting device on a station platform. However, the present invention is not limited to this, and in a place where broadcasting areas are adjacent, for example, partially overlap. If there is, it can be installed in various places. In the above embodiment, the frequency band reproducible by the speakers 6U and 6D and the amplifiers 18U and 18D is divided into two low and high ranges, but two or more ranges, such as a low range, a mid range, and a high range. The equalizers 12U and 12D may be adjusted so as to be divided into sound ranges and to supply low and high sound signals to one of the upstream and downstream broadcast regions 8U and 8D and to supply the middle sound signal to the other. it can. Further, in the above embodiment, two broadcast areas partially overlapping are used. However, the present invention is not limited to this, and the present invention is also applicable to the case where there are three or more broadcast areas partially overlapping. Can be implemented. In this case, the frequency characteristics of the equalizers set for each broadcast area are set so as not to overlap. In the above embodiment, the high frequency is set for the high frequency cut on the upstream side and the low frequency characteristic for the low frequency is set on the downstream side. However, the present invention is not limited to this, and can be set in reverse. In the above embodiment, an audio signal is used as an audible frequency signal. However, the present invention is not limited to this, and for example, a buzzer or a chime sound can be used.
[0019]
【The invention's effect】
As described above, in the broadcasting apparatus of the present invention, the sound source having the same sound quality can be used, so that the initial cost and the maintenance cost can be reduced. Further, since the frequency characteristics of the audible frequency signal having the same sound quality are made different by the frequency characteristic adjusting means and broadcast to the adjacent broadcast area, each audible signal is transmitted even if the broadcast is performed simultaneously in the adjacent part of the broadcast area. The clarity of the frequency signal can be increased. In addition, since the number of speakers to be used can be reduced, it can be easily implemented in any environment.
[Brief description of the drawings]
FIG. 1 is a block diagram of a broadcasting device according to a first embodiment of the present invention.
FIG. 2 is a frequency characteristic diagram of an equalizer used in the broadcasting apparatus of FIG.
3 is a plan view of a platform in which the broadcasting apparatus of FIG. 1 is implemented.
FIG. 4 is a block diagram of a broadcasting device according to a second embodiment of this invention.
[Explanation of symbols]
6U 6D speaker 12U 12D equalizer (frequency characteristic adjusting means)
14 14a Sound source

Claims (3)

Among a plurality of overlapping broadcast areas, a plurality of speakers emitting sound to the corresponding ones,
A sound source capable of supplying a plurality of audible frequency signals having the same sound quality and different contents individually to the corresponding ones of the speakers, and
A plurality of frequency characteristic adjusting means provided between each of the speakers and the sound source and set to frequency characteristics in which sound ranges through which the audible frequency signals pass are different from each other ;
A broadcasting apparatus.   2. The broadcasting apparatus according to claim 1, wherein each frequency characteristic adjusting means is provided in a stage preceding the power amplifier for each speaker.   The broadcasting apparatus according to claim 1, wherein each frequency characteristic adjusting unit is attached to each speaker.

Images