CN2371729Y

CN2371729Y - Integrated speakerphone that eliminates feedback

Info

Publication number: CN2371729Y
Application number: CN 99200193
Authority: CN
Inventors: 陈怡全
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-01-07
Filing date: 1999-01-07
Publication date: 2000-03-29
Anticipated expiration: 2009-01-07

Abstract

An integral hand-free receiver able to eliminate feedback noise is composed of a hand-free receiver, a mobile telephone and an adapter for connecting them, and features that a microphone and a loudspeaker are arranged in the same casing of said receiver, a noise eliminating circuit is arranged between microphone and loudspeaker and connected to mobile telephone via I/O interface.

Description

Can eliminate the integral type Handless of whistler-type noise

The utility model relates to the Handless in a kind of electric communication technique field telephone communication, particularly relate to a kind of utilization and detect input, export source of sound and give anti-phase back generation inversion signal, be located at the integral type Handless that a place produces the whistler-type noise eliminated of whistler-type noise with payment removal microphone, loudspeaker.

See also shown in Figure 4, it is a kind of prior mobile phone Handless 80, these Handless 80 1 ends are provided with cigarette lighter plug 81, supply to be plugged in the cigar lighter on the car, and are provided with circuit in inside, be provided with loudspeaker in its surperficial 82 inboards, grid hole, for playing the other side's sound, Handless 80 is provided with long lead 83 in addition, and lead 83 ends are provided with connector 84, constitute line for pegging graft with mobile phone 85, lead 83 is being provided with a microphone 86 near connector 84 places again.And the user promptly gives orders or instructions by this microphone 86, plays giving orders or instructions of the other side by the loudspeaker on the Handless 80 in addition.

Aforementioned existing Handless 80 no doubt provides the basic function of HANDS FREE, but still have obvious inconvenience in the use, as its loudspeaker is to be arranged on the cigarette lighter plug 81,86 of microphones are located near the lead 83 of mobile phone 85 end place in addition, this kind structural arrangements kenel is subject to fixing pattern, be not used person's actual needs, microphone 86 positions obviously are difficult near the user as described above, and influence communication quality and clarity of signal.

Also there is the dealer to make loudspeaker into earphone again at present, and with lead microphone is pulled out in addition, with the signal input that improves Handless, the quality of output, this kind mode no doubt helps the improvement of signal quality, but make distribution more become complicated simultaneously, and influence the operation of steering wheel, so the aforementioned structure mode is obviously also undesirable.

And in order to take signal quality and distribution simplification into account, microphone and loudspeaker are located in the same Handless housing, and to make Handless directly wear in the user be a feasible scheme on one's body, but generally used the sound appliances person all to understand, when microphone is too near to loudspeaker, because feedbacking, audible warning gives microphone, ear-piercing whister-type noise of disturbing the people will be produced, modern desire is located at the microphone and the loudspeaker of Handless together, as overcoming aforesaid whistler-type noise problem, the aforementioned techniques conception can't be realized,, at first promptly must solve the problem of whistler-type noise so desire to make the microphone of Handless and loudspeaker to be located at a place.This shows that above-mentioned existing Handless still has many defectives, and the assistant officer waits to be improved.

Because the defective that above-mentioned existing Handless exists, the design people actively study innovation based on abundant practical experience and professional knowledge, through constantly studying, design, and after studying sample and improvement repeatedly, creates the utility model finally.

Main purpose of the present utility model is, overcomes the existing defective of existing Handless, and a kind of integral type Handless of eliminating whistler-type noise is provided.

The purpose of this utility model is realized by following technical scheme.According to a kind of integral type Handless of eliminating whistler-type noise that the utility model proposes, include a Handless, a mobile phone and as aforementioned the two connect the adapter of interface, it is characterized in that: it is provided with a whister-type noise and eliminates circuit, it is to detect input respectively on microphone and mobile phone, export source of sound and give anti-phase generation one inversion signal that this whister-type noise is eliminated circuit, through with former output, input smear after remove output, the input source of sound of carrying secretly in former input, the output source of sound with decay, and eliminate whistler-type noise.

The purpose of this utility model can also further realize by following technical measures.

The aforesaid integral type Handless of eliminating whistler-type noise, wherein said whister-type noise is eliminated circuit and is made up of an input unit, an output unit and a central signal control unit, wherein: this input unit, it includes a microphone drive circuit, an amplifying circuit, signal deteching circuit, an attenuator etc.; This signal deteching circuit, be by the microphone drive circuit detect the input source of sound and give anti-phase after, send into output source of sound that central signal control unit and mobile phone deliver to output unit relatively, remove with decay and become entrained in the input source of sound of exporting in the source of sound; This output unit includes an amplifying circuit, signal deteching circuit, an attenuator and a loudspeaker driving circuit etc.; This signal deteching circuit is to detect the output source of sound by linkage interface from mobile phone, sends into the central signal control unit after anti-phase, delivers to input unit again and removes the output source of sound that becomes entrained in the input source of sound with decay.

The aforesaid integral type Handless of eliminating whistler-type noise, the central signal control unit of wherein said whister-type noise elimination circuit can be controlled the work time difference of switch microphone and loudspeaker by the time difference, causes whister-type noise in case stop signal is feedback.

The aforesaid integral type Handless of eliminating whistler-type noise, wherein said attenuator is to be made of mixer.

The utility model compared with prior art has tangible advantage and good effect.By above technical scheme as can be known, the utility model main feature is: this microphone and loudspeaker are located at the Handless of one, can wear nearby on caller's body, numerous and diverse distribution needn't be arranged and influence caller's direction of operating dish; Because microphone and loudspeaker are too near certainly leading to whistler-type noise, and the utility model utilizes whister-type noise elimination circuit can thoroughly solve this problem, and this circuit design only decays and is feedback to the signal of microphone by loudspeaker, the signal of microphone is sent in the outside of can not decaying, and can remove the ear-piercing whister-type noise that produces when signal is feedback effectively.

In sum, the utility model mainly is that microphone and loudspeaker are located in the same Handless housing, be provided with a whister-type noise between this microphone, loudspeaker and eliminate circuit, and by I/O interface and mobile phone line, it is to send into an attenuator respectively after utilization detects input, exports source of sound and gives anti-phase processing that this whister-type noise is eliminated circuit, after can removing microphone, loudspeaker and being located at together with the whistler-type noise that produces, also can utilize the work time difference of switch microphone, loudspeaker in addition, also can reach identical effect.No matter it structurally or bigger improvement is all arranged on the function, and have than much progress technically, and produced handy and practical effect, and have the effect of enhancement really, thereby be suitable for practicality more, really is a new and innovative, progressive, practical new design.

Concrete structure of the present utility model is provided in detail by following examples and accompanying drawing thereof.

Fig. 1 is the stereoscopic figure of the utility model embodiment.

Fig. 2 is a circuit block diagram of the present utility model.

Fig. 3 is a circuit detailed circuit diagram of the present utility model.

Fig. 4 is the stereoscopic figure of existing Handless.

Below in conjunction with accompanying drawing and preferred embodiment, to its concrete structure of integral type Handless, feature and effect thereof according to the whistler-type noise eliminated that the utility model proposes, describe in detail as after.

See also shown in Figure 1, the utility model can be eliminated the integral type Handless of whistler-type noise, it includes a Handless 10, one mobile phone 11 and as aforementioned the two connect the adapter 12 of interface, wherein Handless 10 is arranged with microphone and loudspeaker in same housing, and provide for oneself and be provided with battery working power is provided, can wear nearby on one's body the caller, to keep good communication quality, again because of power autonomous, need not be connected on the cigar lighter, can avoid distribution to hinder the steering wheel operation, and can guarantee the safety of driving a vehicle, moreover this Handless 10 is to be connected with adapter 12 by the lead 13 that two ends are respectively equipped with plug, again by adapter 12 and mobile phone 11 lines.

Because Handless 10 is provided with microphone and loudspeaker simultaneously, so must overcome the problem of whistler-type noise, therefore, the utility model is provided with a whister-type noise and eliminates circuit in the inside of Handless 10, to solve signal back coupling problem.

See also shown in Figure 2ly, this whister-type noise is eliminated circuit, includes an input unit 20, a central signal control unit 30, an output unit 40 etc., wherein:

This input unit 20, it includes a microphone drive circuit that is connected with microphone 21 22, an amplifying circuit 23, a signal deteching circuit 24 and an attenuator 25;

This output unit 40 includes an amplifying circuit that is connected with the mobile phone end 41, a signal deteching circuit 42, an attenuator 43, a loudspeaker driving circuit 44 and is connected in the loudspeaker 45 of loudspeaker driving circuit 44 outputs.

Again the detailed construction of aforementioned circuit and connect to close please cooperate consult shown in Figure 3, the microphone drive circuit 22 of this input unit 20 is made up of some electric capacity, resistance, its output is divided into two, and except that being connected to attenuator 25, is connected to signal deteching circuit 24 simultaneously;

This signal deteching circuit 24, form by two groups of operational amplifiers, two operational amplifiers are to be connected in the input and output of attenuator 25 with its negative terminal input respectively, detect the input sound source signal of sending into by microphone 21 with this, and give anti-phase and constitute an inversion signal, this inversion signal that detects is then delivered on the central signal control unit 30;

This attenuator 25 can be made of a mixer, and its output is except that one group of operational amplifier negative terminal through signal deteching circuit 24 is connected to the central signal control unit 30, and the input that is connected to amplifying circuit 23 again carries out signal and amplifies;

These amplifying circuit 23 outputs then are connected with the mobile phone end by adapter 12.

With regard to aforesaid input unit 20, after the input source of sound is sent into by microphone 21, carried out in 22 minutes two the tunnel by the microphone drive circuit, the first is delivered to the mobile phone end through attenuator 25, amplifying circuit 23, in addition the aspect is then detected by signal deteching circuit 24 and constitutes an inversion signal, and deliver to central signal control unit 30, with foundation as filtration output unit 40 output signals.

The amplifying circuit 41 of output unit 40 again is made up of an amplifier and some resistance, electric capacity, and its input is to be connected with mobile phone by adapter 12, and its output also is connected to outside the attenuator 43, is connected to signal deteching circuit 42 again.

This signal deteching circuit 42 still is made up of two groups of operational amplifiers, two operational amplifiers are to be connected in the input and output of attenuator 43 with its negative terminal input respectively, to detect the output sound source signal that mobile phone sends through amplifying circuit 41 and to give anti-phase and constitute an inversion signal, this inversion signal that detects is also delivered on the central signal control unit 30.

In fact this attenuator 43 can be made of a mixer, its output is connected to the central signal control unit 30 except that one group of operational amplifier negative terminal through signal deteching circuit 42, be connected with loudspeaker 45 through loudspeaker driving circuit 44 again, wherein: this loudspeaker driving circuit 44 is made up of two groups of amplifiers and resistance, electric capacity etc.

With regard to aforesaid output unit 40, after being sent into by amplifying circuit 41, mobile phone output source of sound promptly divide two the tunnel to carry out, the first is delivered to loudspeaker 45 through attenuator 43, loudspeaker driving circuit 44, in addition the aspect is then detected by signal deteching circuit 42 and constitutes an inversion signal, and deliver to central signal control unit 30, with foundation as filtration input unit 20 input signals.

Eliminate circuit with aforesaid whister-type noise and can effectively remove whistler-type noise, its operation principle is detailed as described below:

So-called whistler-type noise is too approaching because of loudspeaker 45 and microphone 21, causes the output source of sound of loudspeaker 45 to be feedback to microphone 21, plays institute by loudspeaker 45 again and causes.Because the utility model is that loudspeaker 45 are located at microphone 21, therefore, the situation that signal is feedback can't be avoided, so the utility model then utilizes aforementioned circuit can effectively improve the back coupling phenomenon that has taken place.

When whister-type noise takes place, it is the input source of sound that comprises microphone 21 because of loudspeaker 45 output signals, and aforesaid central signal control unit 30 detects in contrast to the inversion signal of input, output source of sound by two signal deteching

circuits

24,42 respectively, when the inversion signal of input source of sound is sent into the attenuator 43 of output unit 40, promptly after the smear offset processing, can remove the input source of sound of being carried secretly in its output source of sound.

In like manner, when the inversion signal of output source of sound is sent into the attenuator 25 of input unit 20, then can offset and remove the output source of sound of being carried secretly in its input source of sound.

With above-mentioned operation principle, can solve signal back coupling problem, even microphone is located at loudspeaker, also can not produce whister-type noise.

See also shown in Figure 2ly again, the utility model is removed whistler-type noise except utilizing the aforementioned structure mode, and the also time difference controlled function that can produce by central signal control unit 30 is to solve the problem of whistler-type noise.

When the back coupling amount of Handless too big and when surpassing the controlled quentity controlled variable that the aforementioned structure mode allowed, the exchange frequency that this central signal control unit 30 will utilize a human ear to receive, the work time difference of switch microphone drive circuit 22 and loudspeaker driving circuit 44, when microphone 21 work, make loudspeaker 45 ground connection break-ofves, during loudspeaker 45 work, then make microphone 21 ground connection quit work, can prevent that with the work time difference of the two the stop signal back coupling causes whister-type noise.

The above, it only is preferred embodiment of the present utility model, be not that the utility model is done any pro forma restriction, every foundation technical spirit of the present utility model all still belongs in the scope of technical solutions of the utility model any simple modification, equivalent variations and modification that above embodiment did.

Claims

1, a kind of all-in-one hands-free hands-free hands-free hands-free hands-free hands-free hands-free hands-free hands-free hands-free hands-free hands-free hands-free hands-free hands-free hands-free handset, a mobile phone and the adapter as the aforementioned two connection interfaces are characterized in that:

It is equipped with a howling cancellation circuit. The howling cancellation circuit detects the input and output audio sources from the microphone and the mobile phone respectively and inverts them to generate an antiphase signal. After mixing with the original output and input, the original input is attenuated and removed. , The output and input audio sources contained in the output audio source, and eliminate the feedback howling.

2. The all-in-one hands-free receiver capable of eliminating feedback feedback according to claim 1, wherein the howling elimination circuit is composed of an input unit, an output unit and a central signal control unit, wherein :

The input unit includes a microphone drive circuit, an amplifier circuit, a signal detection circuit, an attenuator, etc.;

The signal detection circuit detects the input sound source by the microphone drive circuit and inverts the phase, then sends it to the central signal control unit and compares it with the output sound source sent to the output unit by the mobile phone, so as to attenuate and remove the input sound source entrained in the output sound source;

The output unit includes an amplification circuit, a signal detection circuit, an attenuator and a speaker drive circuit, etc.;

The signal detection circuit detects the output audio source from the mobile phone through the connection interface, sends it to the central signal control unit after phase inversion, and then sends it to the input unit to attenuate and remove the output audio source entrained in the input audio source.

3. The all-in-one hands-free receiver capable of eliminating feedback feedback according to claim 1 or 2, characterized in that the central signal control unit of the howling elimination circuit can switch the working time difference between the microphone and the speaker through time difference control , to prevent signal feedback from causing howling.

4. The integrated hands-free receiver capable of eliminating feedback howling according to claim 3, characterized in that said attenuator is composed of a mixer.