CN201541345U

CN201541345U - Loudspeaker sound testing device

Info

Publication number: CN201541345U
Application number: CN2009200983214U
Authority: CN
Inventors: 张淳武; 廖帮全; 尹熙正
Original assignee: Tianjin Samsung Electronics Co Ltd
Current assignee: Tianjin Samsung Electronics Co Ltd
Priority date: 2009-08-14
Filing date: 2009-08-14
Publication date: 2010-08-04
Anticipated expiration: 2019-08-14

Abstract

The utility model relates to a loudspeaker sound testing device, which is characterized in that a communication port of a single chip microcomputer circuit of the device is connected with a communication port of a computer, an input/output port of the single chip microcomputer circuit is connected with a sound amplifying circuit, the sound amplifying circuit amplifies and processes sound signals of the single chip microcomputer circuit and sends the amplified signals to a tested loudspeaker, a microphone is fixed on a microphone supporting base, an audio signal wire of the microphone is connected to an input end of a sound processing circuit, amplified audio signals are connected to an audio input port of the computer via a microphone audio signal port, a sound shield consists of a shield base and a shield cover and is made of sound insulation materials, the shield base is fixed on the bottom of the casing, the shield cover can be overturned, and a tested loudspeaker testing clamp, the tested loudspeaker, the microphone supporting base and a circuit board of the microphone are arranged in the sound shield. After being applied, the loudspeaker sound testing device increases detection efficiency and production efficiency and has popularization value.

Description

The loudspeaker sound testing apparatus

Technical field

The utility model relates to the electronic component detection technique, particularly loud speaker (SPEAKER) sound testing apparatus.

Background technology

Along with the vast product of applying electronic industry, consumer electronics field is used by the consumer group widely, the high-quality loud speaker of a new generation is applied in each electronic product widely, to satisfy the brand-new requirement of consumer to sound frequency response, saturation and the distortion factor of loud speaker.Simultaneously, high-fidelity tonequality increases one of important counterweight of product competitiveness beyond doubt for increasing consumer electronics series products.

In loud speaker (SPEAKER) production process, be at product assembling back quality inspection, according to its sounding principle, and according to the different characteristics of its outward appearance of different product, a series of sound that carry out under particular surroundings are tested.Strict test macro is provided, be to reduce the important ring of bad tonequality to the negative effect of product the subject of knowledge and the object of knowledge generation, at electronic technology field, loud speaker (speaker) sound detection is an important procedure, and its checkout equipment and method play crucial effects to testing result, along with the continuous release of new product, the requirement of checkout equipment is also improved constantly, checkout equipment and detection method also will be brought in constant renewal in; Therefore, during a series of sound test that the product of different outward appearances is carried out, loudspeaker sound method of testing and device there are higher requirement under the specific (special) requirements environment, with regard to existing technology, still have further improved space.

Summary of the invention

The purpose of this utility model is exactly the situation at the prior art field, for improving the deficiencies in the prior art part, according to three main test indexs in loud speaker (SPEAKER) audible frequency, be that scope is 300Hz, 1000Hz, the test request of 3000Hz sounding frequency range, by volume (speaker level value) to loud speaker (SPEAKER) sound, isoparametric mensuration of distortion (distortion) and comparison, and then judge whether the product audible segment is qualified, thereby realize providing the solution of a kind of loud speaker (SPEAKER) sound testing method and device to detected product sounding performance detection.

The utility model is to realize by such technical scheme: the loudspeaker sound testing apparatus, the loudspeaker sound testing apparatus mainly is made of casing and the single chip circuit, sound amplifying circuit, tested speaker test fixture, microphone bearing, microphone, sound treatment circuit, microphone audio signal port and the sound radome that are installed in the casing; The communication port of single chip circuit connects computer by the RS232 communication port, and the input/output end port of single chip circuit connects the sound amplifying circuit; Computer is by system test software human-computer interaction interface control single chip computer circuit, and the sound amplifying circuit is 300Hz with the frequency that single chip circuit produces, 1000Hz, the voice signal processing and amplifying of 3000Hz; Again signal is delivered to tested speaker; Microphone is fixed on the microphone bearing, and the audio signal wire of microphone connects the input of sound treatment circuit, is connected to the audio input port AUDIO IN of computer by the microphone audio signal port through the audio signal of processing and amplifying; The sound radome is made of cover seat and cover cap, and the cover seat is fixed in the bottom of casing, and cover body is connected by the hinge-type axle with cover cap, and cover cap is turning, the sound radome is made by acoustic material; The circuit board of tested speaker test fixture, tested speaker, microphone bearing and microphone part is placed in the sound radome.

The application of loudspeaker sound testing apparatus, make in the technological process of loud speaker (SPEAKER) after the product assembling, according to its sounding principle, and, equipped special test environment according to the different characteristics of its outward appearance of different product, the test macro of system's strictness is provided for a series of sound tests of carrying out, thereby reduce the negative effect that bad tonequality produces the product the subject of knowledge and the object of knowledge, improve detection efficiency, improved production efficiency, had promotional value.

Description of drawings

Fig. 1 is a loudspeaker sound testing apparatus structural representation;

Fig. 2 is a loud speaker sound testing apparatus sound amplifying circuit.

Embodiment

Below in conjunction with drawings and Examples the utility model is further elaborated.

The loudspeaker sound testing apparatus mainly is made of casing 1 and the single chip circuit 2, sound amplifying circuit 3, tested speaker test fixture 4, microphone bearing 5, microphone 51, sound treatment circuit 6, microphone audio signal port 7 and the sound radome 8 that are installed in the casing 1;

The communication port of single chip circuit 2 connects computer by the RS232 communication port, and the input/output end port of single chip circuit 2 connects sound amplifying circuit 3; Computer is by system test software human-computer interaction interface control single chip computer circuit 2, and sound amplifying circuit 3 is 300Hz with the frequency that single chip circuit 2 produces, 1000Hz, the voice signal processing and amplifying of 3000Hz; Again signal is delivered to tested speaker 41;

Microphone 51 is fixed on the microphone bearing 5, and the audio signal wire of microphone 51 connects the input of sound treatment circuit 6, is connected to the audio input port AUDIOIN of computer by microphone audio signal port 7 through the audio signal of processing and amplifying;

Sound radome 8 is made of cover seat and cover cap, and the cover seat is fixed in the bottom of casing 1, and cover body is connected with the hinge-type axle with cover cap, and cover cap is turning, the sound radome is made by acoustic material.

The circuit board of tested speaker test fixture 4, tested speaker 41, microphone bearing 5 and microphone 51 parts is placed in the sound radome 8.

According to the circuit structure of Fig. 1 and the circuit diagram of Fig. 2, singlechip chip adopts 80C51, by the clock circuit that crystal oscillator X1, capacitor C 9, C10 constitute, inserts TAL1 and the TAL2 pin of 80C51; SW1, C11, R5 constitute reset circuit, insert the RST pin of 80C51; SW2, R6 constitute interrupt requests input control end, insert the P3.2/INT0 pin of 80C51;

The sound amplifying circuit is that the P0.0～P0.3 by 80C51 draws, and P0.0 and P0.3 connect the two-way loud speaker sounding loop of symmetry in the sound amplifying circuit respectively; The loud speaker sounding loop (1) of drawing with the P0.0 by 80C51 is an example: the P0.0 link circuit is by slide rheostat RV1, and signal is delivered to amplifier S1 (LM386) and amplified, and S1 (LM386) connects capacitor C 4, and output audio signal is given tested speaker LS1; Circuit also comprises R1, C1, C2, C3; This loop is identical with structure, components and parts model, the value in the loud speaker sounding loop (2) that P0.3 by 80C51 draws; The P0.3 link circuit is by slide rheostat RV2, and signal is delivered to amplifier U2 (LM386) and amplified, and US1 (LM386) connects capacitor C 8, and output audio signal is given tested speaker LS2.

Microphone 51 is fixed on the microphone bearing 5, and the audio signal wire of microphone 51 connects the input of sound treatment circuit 6, is connected to the audio input port AUDIOIN of computer by microphone audio signal port 7 through the audio signal of processing and amplifying.

Its method is: by the human-computer interaction interface control loudspeaker sound testing apparatus of computer system prepackage testing software, at first product is placed in the sound radome of loudspeaker sound testing apparatus, make loud speaker self sounding and workshop environmental noise carry out isolation processing, come the corresponding steps of control loudspeaker sound test then by system test software;

1) tested speaker is placed in the sound radome of loudspeaker sound testing apparatus and is fixed on the test fixture; Tested speaker connects the output of sound amplifying circuit;

2) the human-computer interaction interface control single chip computer circuit of operating system testing software, single-chip microcomputer is carried out interrupt requests by instruction; Prepackage sound program in the memory of single-chip microcomputer, comprising three interrupt service routine, producing frequency respectively is 300Hz, 1000Hz, the voice signal of 3000Hz;

3) human-computer interaction interface of operating system testing software, the audio signal data of loudspeaker sound that microphone is received, after handling by audio frequency processing circuit and the audio signal data of system test software standard voice are measured comparison;

4) offer an explanation out defective products, send alarm, detect defective products.

Finish man-machine test interactive interface and realize that by the sound screening arrangement, product self sounding and workshop environmental noise are carried out isolation processing, system test software is used for controlling the corresponding steps that sound is tested by computer program is auxiliary.Because the pars stridulans of consumer electronics product mainly contains low-power speaker and finishes, mainly contain following main points so measure the environmental parameter setting:

Volume (speaker level value) and isoparametric mensuration of distortion (distortion) and comparison:

Speaker level value: detect 300Hz; 1000Hz; The speaker value numerical value of frequency ranges such as 3000Hz, wherein the initial school of system zero parameter mainly is that main reference is because 1000Hz is the most direct to blind tin of detection influence of people's ear with 1000Hz.

Distortion bias: this parameter detecting will be carried out the parameter setting of upper and lower limit according to speaker manufacturer respective model product, usually examination criteria should not surpass ± 5, cause in factors such as product appearances and to detect seal inadequately fully under the situation, visual actual conditions and revise the detection numerical value of this parameter.

Claims

1. loudspeaker sound testing apparatus is characterized in that mainly being made of casing (1) and the single chip circuit (2), sound amplifying circuit (3), tested speaker test fixture (4), microphone bearing (5), microphone (51), sound treatment circuit (6), microphone audio signal port (7) and the sound radome (8) that are installed in the casing (1); The communication port of single chip circuit (2) connects computer by the RS232 communication port, and the input/output end port of single chip circuit (2) connects sound amplifying circuit (3); Sound amplifying circuit (3) is 300Hz with the frequency that single chip circuit (2) produces, 1000Hz, the voice signal processing and amplifying of 3000Hz; Again signal is delivered to tested speaker (41); Microphone (51) is fixed on the microphone bearing (5), the audio signal wire of microphone (51) connects the input of sound treatment circuit (6), is connected to the audio input port AUDIO IN of computer by microphone audio signal port (7) through the audio signal of processing and amplifying; Sound radome (8) is made of cover seat and cover cap, and the cover seat is fixed in the bottom of casing (1), and cover body is connected by the hinge-type axle with cover cap, and cover cap is turning, the sound radome is made by acoustic material; The circuit board of tested speaker test fixture (4), tested speaker (41), microphone bearing (5) and microphone (51) part is placed in the sound radome (8).