CN1219282C - Wide-area PA - Google Patents

Abstract

The invention relates to a wide-area sound amplifying device, which comprises a sound amplifying host machine, more than one loudspeaker and loudspeakers which are in the same number with the loudspeakers and are connected with the sound amplifying host machine in series, wherein each loudspeaker comprises an input port, a signal current generating element, a current sensing element and an amplifier; the input port of each loudspeaker receives a sound signal from the loudspeaker host; the signal current generating element is electrically connected with the input port to pass an acoustic signal; the current sensing element is adjacent to the signal current generating element, and when an acoustic signal passes through the signal current generating element, the current sensing element generates a sensing acoustic signal; the amplifier is electrically connected with the current sensing element, and the sensing sound signal is amplified by the amplifier and then output by the loudspeaker. Therefore, the sound signal can be stably transmitted, and the number of the loudspeakers can be changed according to the requirements of users, so that the broadcasting range is conveniently expanded.

Description

Wide-area PA

Technical field The present invention relates to a kind of loudspeaker device.

Background Art As shown in Figure 1, a general sound amplification system uses a sound amplification main unit 11 to output sound. The output end of the sound amplification main unit 11 is connected in parallel with an impedance matching network 13, which is composed of several speakers 131 connected in series and in parallel. In addition, in order to make the broadcast quality of each speaker 131 meet the required requirements, the main amplifier 111 is also connected with a transformer 112 that can increase the output impedance in the main amplifier 11, so as to improve the output of the main amplifier 11 at the same time. Voltage for each speaker 131 to operate.

There are following disadvantages in the above-mentioned existing general public address system in actual use:

1. Since the impedance matching network 13 of the general PA system is directly connected to the output end of the PA host 11, in order to achieve the best power transmission, the impedance of the output end of the PA host 11 must match the total impedance of the impedance matching network 13 at the load end equal, otherwise the power transfer from the main amplifier output will be greatly reduced, thus causing the impedance design of the impedance matching network 13 to become more complicated, and also because the load end of the main amplifier 11 is connected in series or in parallel with too many impedance elements, resulting in a frequency response of the audio frequency How much attenuation will occur, which will affect the quality of broadcasting.

2. Since the output power of the same PA host 11 is a fixed value, in order to realize the optimal power transmission, the impedance of the output end of the PA host 11 in the general PA system must be equal to the total impedance of the impedance matching network 13 at the load end. match. As a result, the user must consider the series and parallel arrangements of the loudspeakers 131 and the total power they occupy when selecting the main amplifier 11 . Once the design of the impedance matching network 13 is completed, it means that the total impedance of the impedance matching network 13 matches the main amplifier 11, and the positions and numbers of the speakers 131 are fixed, so that the number of speakers 131 cannot be increased arbitrarily. Then the impedance will not be matched, and the output power of the main amplifier 11 is not enough. Therefore, the number of speakers 131 formed by the same main amplifier 11 in the general public address system is limited.

3. When the number of loudspeakers in the impedance matching network 1 needs to be increased, it is necessary to replace the amplifying host 11 with another amplifying host, resulting in high construction costs.

SUMMARY OF THE INVENTION The technical problem to be solved by the present invention is to avoid the shortcomings of the above-mentioned prior art and propose a wide-area sound amplification device that facilitates the expansion of the broadcasting range and reduces the cost of equipment for expanding the broadcasting range.

The present invention solves described technical problem and can realize by adopting following technical scheme:

The design and use also include loudspeakers connected in series with the main amplifier with the same number as the loudspeakers, and each loudspeaker includes an input port, a signal current generating element, a current sensing element and an amplifier;

The input port of each loudspeaker receives the sound signal from the sound amplification host; the signal current generating element is electrically connected to the input port so that the sound signal passes through the signal current generating element; the current sensing element is connected to the signal current generating element. The signal current generating element is adjacent, and when the sound signal passes through the signal current generating element, the current sensing element generates an induced sound signal; the amplifier is electrically connected to the current sensing element, and the induced sound signal passes through the After the amplifier is amplified, it is output through the speaker.

Compared with prior art, technical effect of the present invention is:

1. Since the sound signal output by the sound amplifier host only passes through the signal current generating components of each loudspeaker, the distortion of the sound signal can be minimized and the sound signal can be transmitted stably;

2. Since the wide-area sound amplifying device of the present invention utilizes the current sensing elements of each loudspeaker to generate induced sound signals, and the number of the loudspeakers can vary according to user needs, the present invention can provide a wide range of sound broadcasting.

3. No matter how many loudspeakers are used in the present invention, there is no need to consider the impedance matching between the output end of the main amplifier and the input end of each loudspeaker, so when the number of loudspeakers increases, the main amplifier does not need to be replaced, greatly reducing the equipment cost.

Description of drawings

Fig. 1 is the schematic diagram of existing general public address system;

Fig. 2 is the schematic circuit diagram of the first embodiment of the wide-area sound amplification device of the present invention;

Fig. 3 is the schematic circuit diagram of the second embodiment of the wide-area sound amplification device of the present invention;

Fig. 4 is a schematic diagram of the loudspeaker of the second embodiment of the wide-area sound amplifying device of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Below in conjunction with the preferred embodiments shown in the drawings, further details will be given.

As shown in FIG. 2 , according to the first embodiment of the present invention, the wide-area sound amplification device 3 includes a sound amplification host 31 and multiple loudspeakers 32 .

The output terminal 310 of the sound amplification host 31 outputs a sound signal.

The loudspeakers 32 are connected in parallel with the loudspeaker host 31 . Each microphone 32 includes an input terminal 320 , a signal current generating element 324 , a current sensing element 323 , an amplifier 322 , a speaker 333 and a housing 321 . The input terminal 320 receives the audio signal from the speaker host 31 . The signal current generating element 324 is electrically connected to the input terminal 320 so that the sound signal can pass through. For example, the signal current generating element 324 can be a wire, and the two ends of the wire are connected to the positive and negative poles of the input port. The current sensing element 323 is adjacent to the signal current generating element 324 , and when the sound signal passes through the signal current generating element 324 , the current sensing element 323 generates an induced sound signal. In this embodiment, the current sensing element 323 is an iron core wound coil, and is arranged in parallel with the signal current generating element. The amplifier 322 is electrically connected to the current sensing element 323 , and the sensed sound signal is amplified by the amplifier 322 and then output through the speaker 333 . The signal current generating element 324 , the current sensing element 323 , the amplifier 322 and the speaker 333 are all accommodated in the casing 321 .

The second embodiment of the present invention is shown in Fig. 3 and Fig. 4, and this embodiment is a modification on the basis of the first embodiment. In this embodiment, the wide-area sound amplifying device includes a sound amplifying host 41 and multiple loudspeakers 42 connected in series with it. Each loudspeaker 42 includes an output terminal 420 , a signal current generating element 424 , a current sensing element 423 which is a coil wound around an iron core, an amplifier 422 , a horn 433 and a housing 421 . The difference from the first embodiment is that, as shown in FIG. 4 , the iron core winding coil 423 is annular, and the signal current generating element 424 is placed in the center of the annular iron core 423 and is connected with the iron core 423. plane vertical.

Claims (6)

1. A wide-area sound amplification device, comprising a sound amplification host and more than one loudspeaker, is characterized in that: It also includes a loudspeaker connected in series with the main amplifier with the same number as the loudspeaker, and each loudspeaker includes an input port, a signal current generating element, a current sensing element, and an amplifier; The input port of each loudspeaker receives the sound signal from the loudspeaker host; the signal current generating element is electrically connected to the input port so that the sound signal passes through; the current sensing element is connected to the signal current generating The components are adjacent, and when the sound signal passes through the signal current generating element, the current sensing element generates an induction sound signal; the amplifier is electrically connected to the current induction element, and the induction sound signal is amplified by the amplifier and passed through the speaker output; The current sensing element is an iron core wound coil, which is arranged in parallel with the signal current generating element. 2. The wide-area sound amplifying device according to claim 1, characterized in that: each of the loudspeakers also includes a housing, the signal current generating element, the current sensing element, the amplifier and the The horns are accommodated in the housing. 3. The wide-area sound amplification device according to claim 1, wherein the signal current generating element is a wire, and the two ends of the wire are connected to the positive and negative poles of the input port. 4. A wide-area sound amplification device, comprising a sound amplification host and more than one loudspeaker, characterized in that: It also includes a loudspeaker connected in series with the main amplifier with the same number as the loudspeaker, and each loudspeaker includes an input port, a signal current generating element, a current sensing element, and an amplifier; The input port of each loudspeaker receives the sound signal from the sound amplification host; the signal current generating element is electrically connected to the input port so that the sound signal passes through the signal current generating element; the current sensing element is connected to the signal current generating element. The signal current generating element is adjacent, and when the sound signal passes through the signal current generating element, the current sensing element generates an induced sound signal; the amplifier is electrically connected to the current sensing element, and the induced sound signal passes through the After the amplifier is amplified, it is output through the speaker; The current sensing element is a coil wound with an iron core, and the iron core is annular, and the signal current generating element is placed in the center of the annular iron core and is perpendicular to the plane where the iron core is located. 5. The wide-area sound amplifying device as claimed in claim 4, characterized in that: each of the loudspeakers also includes a housing, the signal current generating element, the current sensing element, the amplifier and the The horns are accommodated in the housing. 6. The wide-area sound amplification device according to claim 1, wherein the signal current generating element is a wire, and the two ends of the wire are connected to the positive and negative poles of the input port.

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