JPS584159Y2 - Crosstalk prevention circuit - Google Patents

Description

[Detailed description of the invention] The present invention is based on an electric stringed instrument in which a pickup provided independently for each string only converts the string vibration of the corresponding string into an electric signal. figure,
As a result of converting even the string vibrations of adjacent strings corresponding to pink-up into electrical signals, it is not possible to extract electrical signals based on the string vibrations of each string independently for each string, and the vibrations of adjacent strings cannot be extracted independently. The present invention relates to a circuit for preventing the so-called crosstalk phenomenon caused by the mixing of electrical signals.

Conventionally, most electric guitars were equipped with a common pink amplifier for each string, facing the strings, but because the pink amplifier is common, the electric signals generated by the string vibrations of each string can be transmitted separately and independently. It cannot be taken out.

Therefore, if it is desired to convert the string vibration into an electrical signal for each string independently and extract it as necessary, one possible method is to install a pick amplifier independently facing each string. However, even in such a case, since the distance between adjacent strings is relatively narrow, an electric signal based on the string vibration of the plucked string is generated in the pink amplifier corresponding to the plucked string, and at the same time, an electric signal is generated in the adjacent string of the plucked string. The corresponding pink-up also generates a small electric signal based on the string vibration, and that electric signal is converted into an electric signal by the pick amplifier corresponding to the adjacent string based on the string vibration of the above-mentioned string itself. In some cases, so-called crosstalk that mixes into the output electrical signal obtained based on the string vibration may occur, making it difficult to fully achieve the purpose of independently extracting the electrical signal based on the string vibration of each string. could not.

The present invention eliminates the above-mentioned drawbacks and achieves the purpose of extracting independent electrical signals from each string.

Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 is an external perspective view showing an example of an electric guitar embodying the present invention, and FIG. 2 is a basic circuit diagram of a crosstalk prevention circuit showing an embodiment of the present invention.

To make the explanation easier to understand, in Fig. 2, which shows a crosstalk prevention circuit between two adjacent strings as a basic circuit, when string 1 is plucked, the string vibration of string 1 is
The electrical signal is converted into an electrical signal by the pink-up P□ provided opposite to the above-mentioned pink-up P1, and the electrical signal is led out by the output line L1 of the pink-up P1, and is connected to the differential amplifier that constitutes the operational amplifier OA1 via the resistor R1□. The signal is applied to the negative input terminal of G1, amplified by the differential amplifier G1, and taken out as an output electrical signal from the output terminal 01.

On the other hand, the string vibration of the string 1 is also slightly converted into an electric signal by the pink-up P2 adjacent to the pink-up P□, which is led out by the output line L2 of the pink-up P2, and then reproduced via the resistor R2°. It is applied to the negative polarity input terminal of the differential amplifier G2 constituting the maximum amplifier OA2.

For convenience of explanation, the above pickups P1 and P2
Therefore, it is assumed that the electrical signals derived from the output lines L1 and L2 are in phase.

Therefore, the electric signal derived from the output line L1 is voltage-divided by the resistors R□2 and R23 and applied to the positive input terminal of the differential amplifier G2, and is mutually connected to the electric signal applied to the negative input terminal. If the values of the resistors R□2 and R23 are set so that they cancel each other out, the signal voltages applied to the positive and negative input terminals are canceled by the differential amplifier G2, and the output side of the differential amplifier G2 is No output signal appears.

In other words, at the output terminal 02 (the string vibration of the ball string 1 is picked up P
The output electrical signal based on the electrical signal converted by 2 does not appear.

Similarly, when string 2 is plucked, the resistance R
If the values of 22 and R13 are appropriately determined, no output signal will appear on the output side of the differential amplifier G1 as described above.

That is, an electric signal based on an electric signal obtained by converting the string vibration of string 2 by pink-up P1 does not appear at the output terminal O.

Therefore, the output electrical signals obtained from the output terminals 01 and 02 are only force electrical signals converted and derived by the pink-ups P1 and P2 based on the string vibrations of the strings 1 and 2, respectively.

For convenience, in the above explanation, the electrical signals converted from the string vibrations of the same string are assumed to be in phase with the pickups P1*P2, but in reality, the phases may be opposite depending on the configuration conditions of the pink amplifier and the strings. In that case, an adder may be used instead of the differential amplifier to cancel out the electrical signals mixed in due to the crosstalk phenomenon.

Although FIG. 2 shows a crosstalk prevention circuit that only supports strings 1 and 2, FIG. 3 shows an example of a crosstalk prevention circuit in which the present invention is applied to a 6-string electric guitar. The electric signals obtained based on the vibrations of each string of strings 1 to 6 are obtained as independent output electric signals from the output terminals 01 to 06 corresponding to each string, respectively, based on the circuit operation explained in FIG. , will not be mixed into the output electrical signal based on the string vibration of the adjacent string obtained from the output terminal corresponding to the adjacent string of each string.

It goes without saying that the arithmetic intensifier described above can be constructed from transistors.

As described above, the present invention is implemented in an electric stringed instrument whose purpose is to extract electrical signals based on string vibrations independently for each string, so that electrical signals based on string vibrations of adjacent strings are transmitted to each string. The present invention provides a highly practical crosstalk prevention circuit that uses a simple circuit to prevent the so-called crosstalk phenomenon from being mixed into corresponding independent output electrical signals.

[Brief explanation of drawings]

Fig. 1 is an external perspective view showing an example of an electric guitar, Fig. 2 is a basic circuit diagram of a crosstalk prevention circuit showing an embodiment of the present invention, and Fig. 3 is an example of the present invention implemented in a 6-string electric guitar. This is an example of a crosstalk prevention circuit. 1 to 6... Strings, pickup between P□ and P6,
Ll-(,6...output line, R□, ~R139R
2□~R23...Resistance, OA□, OA2...
...Operation amplifier q, G□~G6...Differential amplifier, 01-□6...Output terminal.

Claims (1)

[Scope of utility model registration request] In an electric stringed instrument, each string is independently equipped with a mechanical-electrical conversion means for converting string vibration into an electrical signal, and the electrical signal is outputted to each string via an operational amplifier, and
The output line of the electrical conversion means is connected to the machine via a level reducer.
Connected to the input terminal of the operational amplifier corresponding to the mechanical-electrical converting means adjacent to the electric converting means, the string vibration caused by the plucked string is converted by the mechanical-electrical converting means corresponding to the string adjacent to the plucked string. An electric signal input to an operational amplifier corresponding to the adjacent string is converted from the string vibration by the mechanical-electrical conversion means corresponding to the plucked string, and is applied to the adjacent string via the level reducer. The electrical signals input to the operational amplifiers are canceled by the operational amplifiers, and the string vibrations of each adjacent string are included in the output electrical signals obtained from each output side of the operational amplifier corresponding to each string. A crosstalk prevention circuit that prevents electrical signals from being mixed in.