CN101009481B - Sound control circuit for hearing aid - Google Patents

Abstract

Tone control circuit includes: capacitance resistance circuit; the resistance capacitance circuit which is connected with said capacitance resistance circuit; and variable resistance which is connected with resistance capacitance circuit and capacitance resistance circuit or connection point of two circuits. So, when the voice is output, under the condition of unchanging sensuous volume, the toneis easily to be controlled in high frequency and low frequency.

Description

The tone control circuit that is used for hearing aids etc.

Technical field

The present invention relates to a kind of tone control circuit that is used for hearing aids, stereo set etc.

Background technology

Traditional tone control circuit that is used for hearing aids that comprises the control circuit on the high and low frequency is provided to control independently by as shown in Figure 7 capacitance resistance circuit and resistor capacitor circuit.

Therefore, because the control point divided by two points, be very difficult so control by the user of hearing aids.In addition, even because its Be Controlled, loudness when output sound (sensation amount (sensuousvolume)) also changes, so the user has to control simultaneously tone and volume, and to be controlled by the user be difficult.Therefore the user always asks to adjust Xiang doctor, expert.Therefore, the user to keep comfortable state to use be difficult always.

Summary of the invention

Therefore, an object of the present invention is to provide a kind of tone control circuit that is used for hearing aids, this tone control circuit just can easily be controlled tone on low-and high-frequency under the situation that does not change loudness (sensation amount) when output sound.

The present invention is understood to include these embodiment, such embodiment comprises the whole of above-mentioned purpose, feature and advantage or only a part of, unless it is cited being used for defining claim of the present invention, otherwise it should not be understood that to limit the explanation of such claim.According to the description below in conjunction with accompanying drawing, above-mentioned and other target, feature and advantage of the present invention will become obviously, wherein identical Reference numeral appointment components identical.

But, can be expressly understood that accompanying drawing is only used for the purpose of illustration and description, and not be intended to as restrictive definition of the present invention.

Description of drawings

Fig. 1 is the circuit diagram that shows the first embodiment of the present invention;

Fig. 2 is the explanatory diagram that shows the tone control characteristic of the first embodiment of the present invention;

Fig. 3 is the circuit diagram that shows the second embodiment of the present invention;

Fig. 4 is the explanatory diagram that shows the tone control characteristic of the second embodiment of the present invention;

Fig. 5 is the circuit diagram that shows the third embodiment of the present invention;

Fig. 6 is the explanatory diagram that shows the tone control characteristic of the third embodiment of the present invention; And

Fig. 7 is the circuit diagram of prior art.

Embodiment

Below with reference to accompanying drawing the preferred embodiments of the present invention are described in more detail.Can understand the present invention best by reference Fig. 1 and 2.

Reference numeral 1 is the tone control circuit that is used for hearing aids etc.Tone control circuit 1 is installed in hearing aids, the stereo set etc., and importation 2 is connected to signal source (microphone etc.) and output 3 and connects or be installed in earphone, the loud speaker etc.

Tone control circuit 1 comprises: be connected capacitance resistance (CR) circuit 4 between importation 2 and the output 3; Be parallel-connected to resistance capacitance (RC) circuit 5 of capacitance resistance circuit 4; Be connected between resistor capacitor circuit 5 and the capacitance resistance circuit 4 or the variable resistor (VR) 6 of the tie point of these two circuit.In addition, variable resistor 6 has the variable terminal 7 of the importation that is connected to inverting amplifier 8, and the output of this inverting amplifier 8 is connected to output 3.

For above-mentioned tone control circuit 1, when the output of variable resistor in frequency domain 6 occurs (occur) in resistor capacitor circuit 5 sides (side), it plays LPF (low pass filter) circuit, and (phase place is negative sense (backward), promptly, its negative sense works) effect so that it have as existing knowledge-characteristic of 6dB/oct.

On the other hand, when the output of variable resistor in frequency domain 6 appeared at capacitance resistance circuit 4 sides, it plays HPF (high pass filter) circuit, and (phase place was forward (forward), promptly, its forward works) effect so that it have as existing knowledge+characteristic of 6dB/oct.When the output from variable resistor 6 was positioned in intermediate range, frequency characteristic was obviously to have the plane (plane) that balance keeps two frequency characteristics, and this phase place is zero.

For the hearing aids with tone control circuit 1, when variable resistor 6 was changed, the frequency characteristic of tone control circuit smoothly and continuously changed to-6dB/oct from+6dB/oct, as shown in Figure 2.

Therefore, under the situation of the help that does not have doctor, expert etc., the user just can easily control the tone characteristic by user oneself, and it can be at any time feels to control this characteristic with any place according to the user.

In addition, C1, C2, R1, R2 in capacitance resistance series circuit 4 and the resistor-capacitor series circuit 5 is selected as value much at one, and when the cut-off frequency of C and R is based on described frequency, under the situation of the variable effect that does not have variable resistor 6, the amplification degree at the reference frequency place keeps constant.In addition, variable-resistance value is more preferably greater than the value of R1, R2.Fig. 2 has illustrated actual measured value.

And, in the present embodiment, be set at approximate midpoint in the gamut of the sense of hearing in the frequency of datum.Because the scope of hearing aids is approximately 200Hz to 5000Hz, so datum mark is approximate 1000Hz in this case.But, when datum mark is set to 1000Hz, surpasses effective controlled quentity controlled variable in effective controlled quentity controlled variable at low frequency place, thereby datum mark is set at from FR intermediate point little a spot of position that descends at high frequency treatment, for example, it preferably can be by the approximate 700Hz that is set in this case.

Describe other embodiments of the invention referring now to Fig. 3 to 6, by the accompanying drawing of this embodiment, identical parts are represented by the Reference numeral identical with the Reference numeral of first embodiment, and will no longer further be made an explanation in more detail.

Shown the second embodiment of the present invention among Fig. 3 and 4, this second embodiment and the first embodiment difference are that tone control circuit 1A comprises: a plurality of capacitance resistance division circuit 4A, 4B; A plurality of resistor capacitor circuit 5A, 5B, it is connected to a plurality of capacitance resistance division circuit 4A, 4B by related (by association); Variable resistor 6A, it is connected to the part between the output of resistor capacitor circuit 5A, 5B and capacitance resistance division circuit 4A, 4B; And, be used for input signal is carried out anti-phase as being used for the inverter 9 of the device of inverted phase, be connected to the importation of resistor capacitor circuit 5A, 5B and capacitance resistance division circuit 4A, 4B.Have and the similar advantage of tone control circuit that is used for hearing aids etc. according to the tone control circuit 1A that is used for hearing aids etc. of second embodiment according to first embodiment.

As shown in Figure 3, capacitance resistance circuit 4A links to each other with another capacitance resistance circuit 4B in tandem state (tandem state), and resistor capacitor circuit 5A also links to each other with another resistor capacitor circuit 5B.Output from the variable terminal 7 of variable resistor 6A is used to tone control.

In addition, in the present embodiment, be connected to the importation of capacitance resistance circuit and resistor capacitor circuit as the inverter 9 of phasing back device, and it can be connected in the output of capacitance resistance circuit 4A, 4B and resistor capacitor circuit 5A, 5B and the part between the variable resistor 6A.

And when alternative can reverse the phase place of the signal that inputs or outputs, phasing back device 9 can be replaced from division inverter, differential amplifier circuit, new method etc.

Moreover, use two capacitance resistance circuit 4A, 4B and resistor capacitor circuit 5A, 5B in the present embodiment, and can use 3,4 etc. capacitance resistance circuit 4 and resistor capacitor circuit 5.In this case, the flatness lack of balance of the midpoint of frequency, still, damping characteristic but becomes from strength to strength.

In the tone control circuit 1A of present embodiment, for example, as shown in Figure 4, following C and the R of being provided with:

C1＝C2＝C11＝C12＝C；

R1=R2=R11=R12=R; And

CR＝1/2πf。

Mark " f " is meant the reference frequency of tone control circuit and the intermediate frequency of characteristic variations, usually in hearing aids it be set at 1 (one) kHz about.Trunnion axis indication frequency among Fig. 4, the vertical axis indication output among Fig. 4, and each mark meaning is as follows:

C＝160nF；

R=1kohm; And

VR＝500kohm。

The frequency characteristic of the tone control circuit shown in Fig. 3 changes up and down in high scope and low scope place, and gradient changes to-12dB/oct from+6dB/oct.Naturally, basic status is that the face of midpoint is the plane, but from practical point of view, the indenture (dent) with uninterrupted level (uninterrupted level) can form as being taken place.

Shown the third embodiment of the present invention among Fig. 5 and 6, the 3rd embodiment and the second embodiment difference are that amplifier 10,10A are connected to capacitance resistance circuit 4A, 4B and resistor capacitor circuit 5A, 5B.Have and the similar advantage of tone control circuit that is used for hearing aids etc. according to the tone control circuit 1B that is used for hearing aids etc. of the 3rd embodiment, and obtain the characteristic of the tone control shown in Fig. 6 by certain constant displacement (constant shift) according to second embodiment.

In addition, in this embodiment, amplifier 10,10A are that the amplification degree is 1 amplifier, and can use the amplification degree less than 1 amplifier.

As top illustrated, advantage of the present invention is as described below:

(1) described tone control circuit comprises: capacitance resistance (CR) circuit; Be connected to resistance capacitance (RC) circuit of described capacitance resistance circuit; And variable resistor (VR), it is connected between described resistor capacitor circuit and the described capacitance resistance circuit or the tie point of described two circuit. Therefore, can smoothly and continuously change the frequency characteristic at height frequency place.

(2) as discussed above, an action operates tone control owing to only can easily utilize, so the user can come install and adjust audiphone etc. by themselves.

(3) as discussed above, the user can easily install and regulate audiphone etc. by themselves. Therefore, it can keep best condition cosily to use.

(4) as discussed above, owing to compare with traditional equipment, the number of parts comprises the adjusting button, so it can reduce cost, improves reliability and reduces its volume (size).

Claims (10)

1. the output signal that tone control circuit that is used for hearing aids, this tone control circuit are used for receiving inputted signal and provide tone to regulate comprises:

The input of control circuit signal is used to receive described input signal;

Inverting amplifier, the amplifier output that has anti-phase input and be used to export the output signal of described tone adjusting;

Resistance capacitance RC series circuit has RC series circuit input terminal, RC series circuit lead-out terminal and RC series circuit Control Node,

Described RC series circuit is included in RC first fixed resistor that the node place is connected with first capacitors in series that is connected in series, wherein

Described first fixed resistor has the first terminal that forms described RC series circuit input terminal;

Described first fixed resistor has second terminal, and this second terminal of first fixed resistor is connected to the first terminal of described first capacitor jointly at the described RC node place that is connected in series;

The described RC node that is connected in series is described RC series circuit Control Node; And

Described first capacitor has second terminal of the described RC series circuit output of the formation that is connected to described amplifier output;

Capacitance resistance CR series circuit has CR series circuit input terminal, CR series circuit lead-out terminal and CR series circuit Control Node,

Described CR series circuit is included in CR second fixed resistor that the node place is connected with second capacitors in series that is connected in series, wherein

Described second fixed resistor has the first terminal that forms described CR series circuit lead-out terminal and be connected to described amplifier output;

Described second fixed resistor has second terminal, and this second terminal of second fixed resistor is connected to the first terminal of described second capacitor jointly at the described CR node place that is connected in series;

The described CR node that is connected in series is described CR series circuit Control Node; And

Described second capacitor has second terminal that forms described CR series circuit input terminal;

Described RC series circuit is parallel-connected to described CR series circuit by being connected in parallel, described being connected in parallel comprises that described RC series circuit input terminal is connected to described CR series circuit input terminal and described RC series circuit lead-out terminal is connected to described CR series circuit lead-out terminal;

Variable resistance, this variable resistance has:

At the fixed resistance of described RC series circuit outside and described CR series circuit outside, the first terminal of the fixed resistance of described variable resistance is connected to described CR series circuit Control Node and its second terminal is connected to described RC series circuit Control Node;

The sliding contact part is along the fixed resistance of described variable resistance and move to the second place from primary importance; And

The sliding contact part terminal of described sliding contact part is connected to the anti-phase input of described inverting amplifier;

Wherein said sliding contact part along the position change of the fixed resistance of described variable resistance so that side by side change the frequency characteristic of tone control circuit at the high and low frequency place.

2. tone control circuit according to claim 1, wherein, described second terminal of the fixed resistance of described variable resistance is directly connected to described RC series circuit Control Node.

3. tone control circuit according to claim 2, wherein, described second terminal of described first fixed resistor directly is connected to the first terminal place of described first capacitor jointly at described RC series circuit Control Node place.

4. tone control circuit according to claim 3, wherein, described being connected in parallel comprises:

Be directly connected to the first terminal of described first resistor on described RC series circuit input terminal at second terminal of described second capacitor on the described CR series circuit input terminal; And

Be directly connected to second terminal of described first capacitor on described RC series circuit lead-out terminal at the first terminal of described second fixed resistor on the described CR series circuit lead-out terminal.

5. tone control circuit according to claim 1, wherein, the described the first terminal of the fixed resistance of described variable resistance is directly connected to described CR series circuit Control Node.

6. tone control circuit according to claim 5, wherein, described second terminal of described second fixed resistor directly is connected to the described the first terminal of described second capacitor jointly at described CR series circuit Control Node place.

7. tone control circuit according to claim 6, wherein, described being connected in parallel comprises:

Be directly connected to the first terminal of described first resistor on described RC series circuit input terminal at second terminal of described second capacitor on the described CR series circuit input terminal; And

Be directly connected to second terminal of described first capacitor on described RC series circuit lead-out terminal at the first terminal of described second fixed resistor on the described CR series circuit lead-out terminal.

8. tone control circuit according to claim 1, wherein, the described the first terminal of the fixed resistance of described variable resistance is directly connected to described CR series circuit Control Node, and described second terminal of the fixed resistance of described variable resistance is directly connected to described RC series circuit Control Node.

9. tone control circuit according to claim 8, wherein:

Described second terminal of described second fixed resistor directly is connected with the described the first terminal of described second capacitor jointly at described CR series circuit Control Node place; And

Described second terminal of described first fixed resistor directly is connected with the first terminal of described first capacitor jointly at described RC series circuit Control Node place.

10. tone control circuit according to claim 9, wherein, described being connected in parallel comprises:

Be directly connected to the first terminal of described first fixed resistor on described RC series circuit input terminal at second terminal of described second capacitor on the described CR series circuit input terminal; And

Be directly connected to second terminal of described first capacitor on described RC series circuit lead-out terminal at the first terminal of described second fixed resistor on the described CR series circuit lead-out terminal.

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