DE3150839A1 - Method and circuit arrangement for controlling volume, interval frequency and pitch in electro-acoustical transducers - Google Patents

Abstract

Published without abstract.

Description

Method and circuit arrangement for regulating sound

strength, interval frequency and pitch in electroacoustic transducers.

The invention relates to a method for regulating the volume, the interval and the pitch for electroacoustic transducers, especially for Telephony ringing, with the incoming alternating ringing voltage rectified and fed to an astable multivibrator.

Such a method is known from the Mitel data sheets. An integrated module with the designation ML 8204 is used here Input the rectified ringing alternating voltage is applied and at its outputs with RC circuits, pitch and interval are fixed. Furthermore is a circuit branch Can be connected to continuously adjust the volume.

It is the object of the present invention to provide a method and a Specify circuit arrangement in which a regulation of volume, pitch and interval frequency can be made independently of each other.

The object is achieved according to the invention in that for regulation an RC-S attitude is provided for the frequencies of interval and pitch, where either the resistor or the capacitor can be regulated and that for regulation the volume a further circuit branch is provided in which the height the volume through a variable resistor is adjustable.

This changes the volume, the interval and the pitch of the Converter can be regulated independently of one another over a wide range.

A circuit arrangement is now used to carry out the method specified = the one circuit module designed as an astable multivibrator and a Graetz bridge rectifying the incoming ringing AC voltage. The circuit also has a parallel to the DC voltage outputs of the Graetz bridge arranged, the DC voltage limiting diode and one parallel to the DC voltage outputs the Graetz bridge arranged smoothing capacitor.

An expedient embodiment of the invention can be achieved in that the astable multivibrator is arranged in an integrated module, on whose the first output, the interval frequency can be tapped, which is determined by an RC circuit it can be changed that a controllable resistor is connected to a second output which forms a second RC circuit together with a capacitor and is on one connection of the electroacoustic transducer is performed and that to a third Output connected to a variable resistor that regulates the volume of the converter is, which is led to the other terminal of the electroacoustic transducer. Of the The transducer can preferably be designed as a high-resistance, piezoelectric transducer be. However, it is also possible to use an electromagnetic or electrodynamic To use converters with impedance matching.

An advantageous further development of the invention can consist in that in relation to the integrated module (astable multivibrator) further components inte- that are not required for the regulation.

So it can be useful that the resistance of the first RC circuit Is part of the integrated module.

Furthermore, it can be useful that the capacitor of the second RC circuit is part of the integrated module.

Another expedient embodiment of the invention can consist in that the pitch and / or the interval can be adjusted by bridging components is (short-circuit bar), so that controllable resistors or capacitors are not required can.

In the following, the invention is illustrated with reference to two in the figures Circuit arrangements explained in more detail.

1 shows a circuit arrangement of a ringing device with an integrated module as an astable multivibrator as well as externally arranged Components and FIG. 2 shows a circuit arrangement of a ringer, with almost all components are integrated that do not regulate the volume and pitch required are.

After the circuit of FIG. 1, the incoming ringing alternating voltage is applied via the usual wake-up capacitor to terminals W1, W2 and resistor Ro to the Graetz bridge G with its diodes D1 to D4, where it is rectified. Limited the DC voltage is generated by the Zener diode ZO. One connected in parallel to the Zener diode Z0 Smoothing capacitor Co provides one of Relatively free harmonics DC voltage. The DC voltage is now applied to terminals 1 and 6 of the astable Multivibrators led. There is an RC circuit with the Resistor R1, C1 connected, the resistor R1 being designed to be controllable and determines the interval frequency.

Another RC circuit is connected to connections 4 and 7, which consists of the adjustable resistor R2 and the capacitor C2. Through this Circuit, the pitch of the ring tone is determined.

Finally, there is a further adjustable resistor at connection 5, among other things R3 connected, which determines the level of the volume of the ringer. The resistance R3 is led to the connection PW1 of the ringer converter TR. The connector PW2 of the converter is connected to the negative potential of the DC voltage.

In Fig. 2, a circuit arrangement for a tone call is shown. The alternating ringing voltage arriving at terminals W1 / W2 is supplied via a series resistor Ro a Graetz bridge arranged in an integrated module over the connections 1, 8 forwarded. The one required to limit the sliding voltage is also integrated Zener diode Z0. The smoothing capacitor C0 is arranged externally because of its size. An RC circuit is provided for setting the interval frequency the capacitor Cl and the resistor R1. The resistor R1 is integrated and the capacitor is arranged externally. The resistor is also arranged externally R2 of a second RC circuit, the capacitor C2 and the resistor being integrated R2 is designed to be adjustable for setting the pitch.

Terminal 5 of the integrated module is lich Another adjustable resistor R3 is connected, through which the volume of the Ringer is adjustable.

In principle, the ringing transducer TR is wired in the same way as the one in Fig. 1 shown circuit arrangement, with the circuit arrangement shown in FIG Most of the components not required for the control are integrated.

5 claims 2 figures Blank page

Claims (5)

Claims Ci. Procedure for regulating the volume, the interval frequency as well as the pitch for an electroacoustic transducer, especially for tone calls telephony, with the incoming ringing alternating voltage being rectified and is fed to an astable multivibrator, that is, by g e -k e n n n z e i c h n e t that an RC circuit is used to regulate the frequencies of the interval and pitch is provided, with either the resistor (Ri, R2> or the capacitor (C1, C2) can be regulated and that a further circuit branch for regulating the volume is provided in which the level of the volume is controlled by a variable resistor (R3) is adjustable. 2. Circuit arrangement for carrying out the method with an as astable multivibrator trained circuit module and one the incoming Graetz bridge rectifying ringing AC voltage and one parallel to the DC voltage outputs the Graetz bridge arranged, the DC voltage limiting diode and a Smoothing capacitor arranged parallel to the DC voltage outputs of the Graetz bridge, according to patent claim 1, d a d u r c h g e -k e n n z e i c h n e t that the astable Multivibrator is arranged in an integrated module, at the first output (3) the interval frequency can be tapped, which can be changed by an RC circuit (R1, C1) is that a controllable resistor (R2) is connected to a second output (4) which, together with a capacitor (C2), forms a second RC circuit (R2, C2) forms and is led to a terminal of the electroacoustic transducer (PW2) and that at a third output (5) the volume of the electroacoustic Converter regulating, variable resistor (R3) is connected to the other connection (PW1) of the converter is performed. 3. Circuit arrangement according to claim 2, d a d u r c h g e k e n n z e i c h n e t that the resistor (R1) of the first RC circuit is part of the integrated module is. 4. Circuit arrangement according to claim 2, d a d u r c h g e k e n n z e i c h n e t that the capacitor (C2) is part of the second RC circuit of the integrated module is. 5. Circuit arrangement according to claim 2, d a d u r c h g e k e n n indicate that the pitch and / or the interval by partially bridging of components (R1, C1) is adjustable (short-circuit bar).