JPH05344598A - Configuration of output signal adjusting circuit for multichannel electroacoustic device - Google Patents

Abstract

PURPOSE: To enable the conditioning of the stereo angle and the spatial distribution of different sound sources and to contrive the transduction of a stereo sound experience within wide limits by forming the input circuit of plural electroacoustic transducers with a specific configuration and inputting the output signals of different channels. CONSTITUTION: Connecting terminals 4A and 4B which correspond a certain polar of the electroacoustic transducers 6A and 6B respectively are connected to output signal terminals 3A and 3B of different channels respectively, connecting terminals 4C and 4D corresponding to another polar are mutually connected and grounded via a potentiometer 7. In such circuit configuration, by adjusting the potentiometer 7, the phase position of signals and input voltages to be given to the electroacoustic transducers 6A and 6B can be infinitely converted. Thus, dynamic, the position of a sound source, stereoscopic impresion and sound volume can be changed within wide limits.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a circuit arrangement for conditioning the output signal of a multi-channel, electro-acoustic device, which comprises an output amplifier and an electro-acoustic converter for each channel. It is composed of circuit elements and derives mutual effects between output signals of different channels.

[0002]

2. Description of the Prior Art A circuit arrangement of this type is described in DE-PS 737,121, which is the same as US Pat. Nos. 24,81,911 and 39,24,072. In this prior art, the adjustment of the output signal is to allow other stereo signals to be added to different stereo channels to different extents, in order to actually suppress the stereo effect to a greater or lesser extent. .. However, in this case, the variability of the acoustic impression is limited because the phases of the individual signals contained within all signals are not evaluated and influenced.

[0003]

The object of the present invention is to design a circuit arrangement of the type described above, so that the stereophonic sound experience can be altered rather than the previously known methods.

[0004]

It is an object of the invention, according to the invention, for the corresponding coupling terminals of an electro-acoustic transducer of one polarity to be connected to a point of the circuit carrying the output signal of the output amplifier of the various channels and to another. This is accomplished by having the corresponding coupling terminals of the polarities of 1 and 2 connected together and connected to earth by a potentiometer.

[0005]

With the circuit configuration according to the present invention, the phases of signals appearing in the electro-acoustic transducers belonging to various channels can be adjusted infinitely over a wide range. In contrast to the prior art, it makes it possible to adjust the stereo angles and spatial distributions of different sound sources (musical instruments and singers) depending on the subjective wishes. The mono signal added to the multi-channel total signal can be pushed back to a considerable extent without the signal apparently losing its multi-channel characteristics and its dynamics.

The circuitry of the present invention may be included in an additional device, which is conventionally between the output terminal of a commercially available electro-acoustic device and the corresponding input terminal of the associated electro-acoustic transducer. You can connect with. An "adapter" type is conceivable in this connection, which can be connected between the stereo device and the headphones or even the loudspeaker unit. As a variant, the circuit arrangement according to the invention can also be integrated in an electro-acoustic device in a fixed manner. The potentiometer according to the invention then has the same important functions as volume control, balance and pitch control as adjusting elements.

Since the potentiometer adjustment provided by the present invention involves some dynamic changes, improvements in the circuitry of the present invention are recommended, where another potentiometer is coupled to the corresponding polar output amplifier. Located on each of the terminals, the potentiometer pick-off of which is placed on the same axis of rotation as the potentiometer pick-off, so that the corresponding coupling terminal of the other polarity is connected to ground. However, the resistance value of this other potentiometer changes in the opposite direction of the resistance value of the potentiometer described in claim 1. In this configuration, changes in dynamics are automatically compensated for, although adjustment of the stereo sound experience with it would otherwise be required for another potentiometer.

[0008]

Embodiments of the invention will be described in detail hereinafter in connection with the drawings. FIG. 1 diagrammatically shows the circuit configuration of the additional device, which is connected between the headphone connection terminal of the stereo device and the headphones. FIG. 2 diagrammatically shows the corresponding circuitry for operating the two loudspeakers of a stereo device, which can optionally be integrated in the stereo device or designed as an adapter. Figure 3
Shows the adjustment of the circuit configuration of FIG. FIG. 4 contains a schematic diagram of the additional device, the circuit configuration of which is shown in FIGS.

The circuit configuration shown in FIG. 1 is mainly shown in FIGS. 4A and 4A.
It is intended for an additional device as schematically depicted in B. That is, the circuit configuration itself is placed in the small box 1 and then the lead 2 leads to the plug 3, which is connected to the headphone connection terminal where the stereo device is present. The cable 20 connected to the small box 1 by the plug connection terminal 4 reaches the headphones 6. The stereo sound experience can be changed by rotating the operating knob 7.

The embodiment of the add-on device shown in FIG. 4B is entirely identical to that of FIG. 4A except that a slide controller 7A is provided instead of the rotary knob 7. The circuit arranged in the small box 1 is the simplest, the first embodiment is shown in FIG. The input terminal 3A, which is part of the plug 3 and is connected from the back to the output amplifier of the left stereo channel of the stereo device, is directly connected to the positive connection terminal 4A of the left headphone earpiece 6A.

The terminal 3B is connected in a manner corresponding to the output amplifier of the right stereo channel of the stereo device and is directly connected to the positive connection terminal 4B of the right headphone earpiece 6B. The negative connection terminals 4C and 4D of the headphone earpieces 6A and 6B are interconnected and connected through the potentiometer 7 to the terminal 3C of the plug 3, which is connected to the ground of the stereo device.

By adjusting the potentiometer 7, the phase position of the signal provided to the headphone earpiece, ie the stereophonic experience, can be altered in a manner different from what is known in the art. The resistance value adjusted by potentiometer 7 is continuously variable between 0 ohm and "infinity" (actually a relatively high value). If this resistance is equal to 0, then an independent current flows from the output stage amplifier of the stereo device through the coils of the headphone earpieces 6A and 6B and the terminal 3C of the plug 3 and through the terminals 3A and 3B. This corresponds to the usual way of operating stereo equipment, in which the right and left channels have no influence on each other.

However, if the resistance value of the potentiometer is increased by rotating the knob depicted in FIG. 4A or by sliding the slide controller 7A of FIG. 4B, then the terminal 3A.
And the stereo signals appearing in 3B interact in an innovative and indeed signal-dependent manner. By changing the value of the potentiometer 7, the headphone earpiece 6A and 6
The voltage effectively appearing on B can be changed infinitely. This allows the dynamics, the position of the instrument at the listening angle, the stereo impression, the low volume and even, for example, the volume of the singer to be varied within wide limits. For example, it is possible to change the singer's voice added to the stereo music signal as a mono signal, so that the integrated music hardly changes as a stereo signal with 70-80% dynamics. However, the singer's voice dynamics are reduced to 90%, so that it is only heard in the background as almost individual echoes.

The circuit configuration depicted in FIG. 2 is consistent with the embodiment described above in connection with FIG. 1, with a few exceptions described hereafter. Corresponding parts are therefore given the same reference numbers, plus 100. Terminal 103
A, 103B and 103C are in this case attached to the output amplifier of the stereo device and its casing (c
should be considered as internal. The left loudspeaker 106A and the right loudspeaker 106B are used as electro-acoustic transducers. The negative connection terminal 104 of the loudspeaker 106A is in this case the same as the circuit point 103A,
It is connected to the output of the output amplifier for the left stereo channel. Similarly, the negative connection terminal 104B = 103B of the right loudspeaker 106B is connected to the output of the output amplifier for the right stereo channel.

The positive connection terminals 104C and 104D of the corresponding loudspeakers 106A and 106B are interconnected and connected to a potentiometer 107 which should be considered to be internal to the stereo system. The other end of potentiometer 107 is connected to point 103C on the internal circuitry of the stereo device, which is connected to ground. The method of operation of the embodiment depicted in FIG. 2 is substantially similar to that of the embodiment of FIG.

If a pure mono signal appears at terminals 3A, 3B or 103A, 103B of the circuit arrangement according to FIGS. 1 and 2, then potentiometers 7 and 107 (preferably added) are volume control members. ) Function. As described above, the adjustment of the values of the potentiometers 7 and 107 does not change the phase position at all. That is to say, there is a further change in the dynamics of the signal appearing at the electro-acoustic transducer 6 or 106. This change in dynamics can in principle be basically compensated for by the volume controllers that are respectively present in the stereo device. However, it is easier to automatically compensate for this change in dynamics, as shown in the example depicted in FIG. This embodiment is a simple adjustment of the circuit configuration depicted in FIG. Corresponding parts are therefore characterized by adding 200 to the same reference numbers.

In FIG. 3, the headphone having the left headphone earpiece 206A and the right headphone earpiece 206B is used as an electro-acoustic transducer. The positive connection terminal 204A of the left headphone earpiece 206A is the small box 1 of the additional device (see FIG. 4).
Another potentiometer that should be considered as one in
08 is sequentially connected to the terminal 203A of the plug 203 for transmitting the left stereo signal of the stereo device. The potentiometer 208 is connected in the opposite direction of the potentiometer 207, that is, when rotating in the same direction, the resistance values of the potentiometers 208 and 207 change in opposite directions.

Similarly, the right headphone earpiece 20
The positive connection terminal 204B of 6B is the potentiometer 20.
9 is connected to a terminal 203B of a plug 203 for transmitting the right stereo signal of the stereo device. Headphone earpieces 206A and 206B negative connection terminal 204
C and 204D are again interconnected and connected to terminal 203C of plug 203 which is connected to ground through potentiometer 207. Potentiometer 207, 2
08 and 209 are placed on a common axis and coordinated together. Thus, when rotating the common axis through an angle, the values of resistors 208 and 209 are measured by potentiometer 207.
Is increased or decreased by the amount required to equalize the dynamic changes caused by.

[0019]

With the circuit configuration according to the present invention, the phases of signals appearing in electro-acoustic transducers belonging to various channels can be adjusted infinitely over a wide range. In contrast to the prior art, it makes it possible to adjust the stereo angles and spatial distributions of different sound sources (musical instruments and singers) depending on the subjective wishes. The mono signal added to the multi-channel full signal can be pushed back to a considerable extent without the signal clearly losing its multi-channel characteristics and its dynamics.

The circuitry of the present invention may also be included in an add-on device, which conventionally corresponds to the output terminal of a commercially available electro-acoustic device and the corresponding input terminal of the electro-acoustic transducer. Can be connected between. An "adapter" type is conceivable in this connection, which can be connected between a stereo device and headphones or even a loudspeaker unit, and as a variant, the circuit arrangement according to the invention can also be integrated in a fixed manner in an electro-acoustic device. The potentiometer according to the invention then has the same important functions as volume control, balance and pitch control as adjusting elements. Further, since the potentiometer adjustment provided by the present invention involves certain dynamic changes, improvements in the circuitry of the present invention are recommended, and dynamic changes are automatically compensated.

[Brief description of drawings]

FIG. 1 schematically shows the circuit configuration of an additional device, which is connected between a headphone connection terminal of a stereo device and a headphone.

FIG. 2 diagrammatically shows the corresponding circuitry for operating the two loudspeakers of a stereo device, which may optionally be integrated in the stereo device or designed as an adapter.

FIG. 3 illustrates adjustment of the circuit configuration of FIG.

FIG. 4 includes a schematic diagram of an additional device, the circuit configuration of which is shown in FIGS.

[Explanation of symbols]

1 ... Small box 2 ... Lead 3 ... Plug 4 ... Connecting terminal 6 ... Headphone 7 ... Rotating knob 7A ... Slide controller 6A, 6B, 106A, 106B, 206A, 206B
... Electric-acoustic transducer 7,107,207,208,209 ... Potentiometer 20 ... Cable 4A, 4B, 104A, 104B, 204A, 204B
... Plus terminal for electric-acoustic converter 4C, 4D, 104C, 104D, 204C, 204D
... Electric-acoustic converter compatible negative terminals 3A, 3B, 103A, 103B, 203A, 203B
… Electric-acoustic equipment corresponding output terminals 3C, 103C, 203C ... Electro-acoustic equipment corresponding ground terminals

Claims (4)

[Claims] 1. An output signal of an electro-acoustic device comprising an output amplifier and an electro-acoustic transducer of each channel, a multi-channel composed of circuit elements provided to induce an interaction between the output signals of various channels. In the circuit configuration for adjustment of the electro-acoustic transducer (6A, 6B; 106
A, 106B; 206A, 206B) with polarity (+ or-) (4A, 4B; 104A, 104B; 204A,
Circuit points (3A, 3B; corresponding connection terminals of 204B) carry output signals of output amplifiers of various channels;
103A, 103B; 203A, 203B) and another polarity (-or +) (4C, 4D; 104
The corresponding connection terminals of C, 104D; 204C, 204D) are interconnected and the potentiometer (7; 10
7; 207) connected to ground through a circuit arrangement for conditioning the output signal of a multichannel, electro-acoustic device. 2. It is traditionally a commercially available electricity-
2. The circuit arrangement according to claim 1, characterized in that it is included in an additional unit which can be connected between the output terminal of the audio device and the corresponding input terminal of the associated electro-acoustic transducer. 3. A circuit arrangement according to claim 1, characterized in that it is integrated in a manner fixed in the electro-acoustic device. 4. A potentiometer (208,
209) has one polarity (204A, 204B)
Placed within the connection to the output amplifier of the corresponding connection terminal of
The pick-off is placed on the same axis of rotation as the pick-off of the potentiometer (207), through which the corresponding connection of the other polarity (204C, 204D) is connected to ground, however these additional ports are connected. 4. The circuit according to claim 1, wherein the resistance value of the tensiometer (208,209) changes in the opposite direction to the resistance value of the potentiometer (207) according to claim 1. Constitution.