CN202979261U

CN202979261U - Adjustable gain microphone

Info

Publication number: CN202979261U
Application number: CN 201220667279
Authority: CN
Inventors: 田达亨; 姜增文; 许澎胜
Original assignee: Shandong Gettop Acoustic Co Ltd
Current assignee: Shandong Gettop Acoustic Co Ltd
Priority date: 2012-12-06
Filing date: 2012-12-06
Publication date: 2013-06-05
Anticipated expiration: 2022-12-06

Abstract

The application discloses an adjustable gain microphone. A V/I conversion device of the microphone is an ASIC having an adjustable gain function and is used for carrying out read-write adjustment to a gain control register in the ASIC. The ASIC is provided with two work states which concretely comprise a normal use state and a gain adjustment state. An eligible sensitivity scope is set by externally debugging devices. By adopting the ASIC provided with the adjustable gain function, manufactured products have a consistent sensitivity value, so that a yield is raised and production cost is reduced.

Description

A kind of adjustable gain microphone

Technical field

The utility model relates to the mike technique field, in particular, relates to a kind of adjustable gain microphone.

Background technology

MIC(Microphone, microphone or microphone), be voice signal to be converted to the energy conversion device of the signal of telecommunication, also be known as microphone or microphone.At present, most of microphones are all ECM(Electret Condensor Microphone, electric capacitor microphone), its operation principle is to utilize the polymeric material vibrating membrane with permanent charge isolation.

The sensitivity of ECM is made of acoustic sensitiveness and circuit gain two aspects, and wherein, acoustic sensitiveness is relevant to vibrating diaphragm area, diaphragm tensile force, polar plate spacing, polarization potential and the back of the body operatic tunes volume etc. of ECM; Circuit gain is relevant to aspects such as lead-out wire parasitic capacitance, amplifier gain and amplifier parasitic capacitances, the possible excursion of above-mentioned parameter is very limited, and its nuance is inevitable, and that its V/I switching device uses is J-FET, and for J-FET, its gain is fixed, the adjustment that cannot also cannot gain, and the nuance of parts and the difference of manufacturing process cause the dispersion of sensitivity.After ECM completes, in the situation that the later stage basis requires sensitivity, ECM is screened to survey select qualified product, therefore, the distribution of sensitivity is still a kind of distribution situation of discrete type, error for+/-finished product of 2dB best be only also 95% left and right.

Therefore, because these differences are inevitable, a kind of adjustable gain microphone is provided for this reason, can be after MIC completes, gaining by adjustment when the sensitivity that needs is set makes the product that is made into have consistent Sensitirity va1ue, and then improve rate of finished products and reduce cost of manufacture, be those skilled in the art's problem demanding prompt solutions.

The utility model content

In view of this, the utility model provides a kind of adjustable gain microphone, J-FET to overcome in prior art what use due to the V/I switching device, and for J-FET, its gain is fixed, the adjustment that cannot also cannot gain can't arrange the sensitivity that needs and make the product that is made into have consistent Sensitirity va1ue, and then improves the problem of rate of finished products and reduction cost of manufacture.

For achieving the above object, the utility model provides following technical scheme:

A kind of adjustable gain microphone, the V/I switching device of described microphone are the ASIC integrated circuit with gain adjustable function, and the gain control register in described ASIC integrated circuit is read and write adjustment.

Wherein, described ASIC integrated circuit has two kinds of operating states, is specially: normal operating condition and gain adjustment state.

Via above-mentioned technical scheme as can be known, compared with prior art, the utility model openly provides a kind of adjustable gain microphone, the V/I switching device of described microphone is the ASIC integrated circuit with gain adjustable function, and the gain control register in described ASIC integrated circuit is read and write adjustment.Described ASIC integrated circuit has two kinds of operating states, is specially: normal operating condition and gain adjustment state.By external debug equipment, the qualified range of sensitivity is set, adopts the ASIC integrated circuit with gain adjustable function to make the product that is made into have consistent Sensitirity va1ue, thereby improve rate of finished products and lower production cost.

Description of drawings

In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or description of the Prior Art, apparently, accompanying drawing in the following describes is only embodiment of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to the accompanying drawing that provides other accompanying drawing.

Fig. 1 is the disclosed a kind of adjustable gain microphone construction schematic diagram of the utility model embodiment;

Fig. 2 is the schematic diagram of the disclosed ASIC integrated circuit of the utility model embodiment.

Embodiment

Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is only the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that obtains under the creative work prerequisite, all belong to the scope of the utility model protection.

The utility model openly provides a kind of adjustable gain microphone, and the V/I switching device of described microphone is the ASIC integrated circuit with gain adjustable function, and the gain control register in described ASIC integrated circuit is read and write adjustment.Described ASIC integrated circuit has two kinds of operating states, is specially: normal operating condition and gain adjustment state.By external debug equipment, the qualified range of sensitivity is set, adopts the ASIC integrated circuit with gain adjustable function to make the product that is made into have consistent Sensitirity va1ue, thereby improve rate of finished products and lower production cost.

See also accompanying drawing 1, be the structural representation of the disclosed a kind of adjustable gain microphone of the utility model embodiment.The utility model embodiment discloses a kind of adjustable gain microphone a kind of, and the V/I switching device of described microphone 1 is the ASIC integrated circuit 2 with gain adjustable function, and the gain control registers in described ASIC integrated circuit 2 are read and write adjustment.Described ASIC integrated circuit 2 has two kinds of operating states, is specially: normal operating condition and gain adjustment state.

See also accompanying drawing 3, be the schematic diagram of the disclosed ASIC integrated circuit of the utility model embodiment.

Use this ASIC integrated circuit in microphone, after the microphone assembling is completed, the qualified range of sensitivity is set, sensitivity to microphone is tested, the setting in scope does not make the ASIC integrated circuit enter " gain adjustment state ", according to the height of sensitivity and turn down or heighten the gain of ASIC integrated circuit, make microphone get change of sensitivity in the qualified range of sensitivity.

The utility model discloses a kind of adjustable gain microphone, by external debug equipment, the qualified range of sensitivity is set, the ASIC integrated circuit that employing has the gain adjustable function makes the product that is made into have consistent Sensitirity va1ue, thereby improves rate of finished products and lower production cost.

In sum, the utility model discloses a kind of adjustable gain microphone, the V/I switching device of described microphone is the ASIC integrated circuit with gain adjustable function, and the gain control register in described ASIC integrated circuit is read and write adjustment.Described ASIC integrated circuit has two kinds of operating states, is specially: normal operating condition and gain adjustment state.By external debug equipment, the qualified range of sensitivity is set, adopts the ASIC integrated circuit with gain adjustable function to make the product that is made into have consistent Sensitirity va1ue, thereby improve rate of finished products and lower production cost.

To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the utility model.Multiple modification to these embodiment will be apparent concerning those skilled in the art, and General Principle as defined herein can be in the situation that do not break away from spirit or scope of the present utility model, realization in other embodiments.Therefore, the utility model will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.

Claims

1. an adjustable gain microphone, is characterized in that, the V/I switching device of described microphone is the ASIC integrated circuit with gain adjustable function, and the gain control register in described ASIC integrated circuit is read and write adjustment.

2. microphone according to claim 1, is characterized in that, described ASIC integrated circuit has two kinds of operating states, is specially: normal operating condition and gain adjustment state.