JPH03179399A - Timbre generating device - Google Patents

Abstract

PURPOSE:To obtain a general musical sound signal like an electric guitar from a string vibration signal which contains many higher harmonic components by setting mutually different frequency characteristics of comb-shaped filters provided for plural sound sources. CONSTITUTION:Features of higher harmonic components when the string vibration signal is detected by a pickup are simulated by the comb line filters. Namely, the comb line filters each consisting of a delay means 3, an inverting amplifier 4, an adder 5, etc., are provided for the respective sound sources, and the delay time of each delay means 3 is controlled to set the dip of the comb line filter corresponding to a specific frequency. Then when the string vibration signal which contain many higher harmonics is inputted like a signal obtained by detecting string vibration by a pickup nearby a bridge is inputted to an input terminal 1, musical sound signals are obtained by the respective sound sources like the pickup is provided at a general position. Thereby, the musical sound signal similar to the general electric guitar can be obtained even from a string vibration signal having much higher harmonic components.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention is capable of obtaining a musical tone signal similar to that detected by a pickup located at a different position from the pickup by simply detecting string vibration at one pickup location. The present invention relates to a timbre forming device that is effective when implemented in electric stringed instruments and electronic musical instruments such as electric guitars.

[Prior Art] Conventionally, there has been an electronic musical instrument called a guitar synthesizer, but a guitar synthesizer that extracts pitch from a string vibration signal is not a sound source that electronically generates musical sounds. In addition, I would like to have something that can output string vibration signals as they are in order to provide a variety of types of musical sound signals.

However, in such guitar synthesizers, the pickup was installed near the bridge in order to improve the separation between adjacent strings and to make it easier to detect the pitch of the string vibration signal.

However, since the string vibration signal detected by a pickup located in such a position contains many harmonic components,
You can use the string vibration signal as a back string vibration signal that shapes the tone with a bypass filter, band-pass filter, low-pass filter, etc., or alternatively, you can create a guitar synthesizer by attaching a pickup for a guitar synthesizer near the bridge of an ordinary electric guitar. It was improved so that it could be used as a controller for string vibrations, and the output signal from the electric guitar Bikua Tsubu, which had been included since the beginning, was used as the string vibration signal.

Note that the pin-up knob for the guitar synthesizer refers to a pin-up knob that is provided corresponding to each string and independently detects string vibration signals, and is hereinafter referred to as a divided pin-up knob.

[Problems to be Solved by the Invention] However, as mentioned above, even if tone formation is performed using only a bypass filter, band-pass filter, or low-pass filter, it is not possible to produce a good musical tone signal like that detected by a pickup installed in a general position. is not obtained. Furthermore, the method of separately installing a pickup for a guitar synthesizer on an ordinary electric guitar has the drawbacks of high cost and limited space for installing a divided pickup.

Therefore, the present invention uses only string vibration signals with high harmonic components detected by a divided pickup installed near the bridge, and a musical sound signal in which string vibrations are detected by a pickup installed in a general position such as an electric guitar. It is designed to provide a wide range of musical tones, and is also capable of providing a wider variety of musical tone signals than ordinary electric guitars.

The general position for mounting the pickup is about 1/4 of the total length of the strings 37 from the bridge 38, as shown in Figure 3, but there is no fixed position and each electric stringed instrument has its own location. In some cases, multiple pickups are installed in different positions to change the tone of the string vibration signal, for example, the one installed near the neck is the front pickup, and the one near the bridge is installed. The one installed is called a rear pickup.

Here, as an example, the general mounting position of the pickup will be explained at a position about 1/4 of the total length of the string.

When the pickup is in this position, Fig. 4 (4-1), (
4-4 harmonics such as 4-2), (4-3), (4-4), 8
Overtones, 12th overtones, 16th overtones.

The nodes of string vibration coincide with the position of the pickup, and as a result, the level of these harmonic components detected by the pickup becomes low.

On the other hand, if the pickup is located at the antinode of the string vibration, the level of these harmonic components will be high.

[Means for Solving the Problems] Therefore, the present invention uses a comb filter to imitate the characteristics of the harmonic components when a string vibration signal is detected by a pickup, thereby detecting the string vibration signal with a divided pickup installed near the bridge. It is possible to provide a musical tone signal similar to that of a general electric guitar even from a string vibration signal containing many harmonic components.

[Operation] The present invention detects string vibration signals with many harmonic components when detected by a divided pickup installed near the bridge.
The position of the pickup 49 as shown in (4-4) removes harmonic components corresponding to the nodes of string vibration, and attempts to obtain a musical tone signal that is detected by a pickup at a different position from the actually detected pickup. It is something.

[Embodiment] FIG. 1 is a block diagram of a timbre forming device according to a first embodiment of the present invention.

This tone forming device includes a buffer amplifier 2 connected to an input terminal 1, a delay means 3 whose input terminal is connected to the output terminal of the buffer amplifier 2, and an input terminal connected to the output terminal of the delay means 3. The adder 5 includes an inverting amplifier 4 and an adder 5 in which the output terminal of the buffer amplifier 2 and the output terminal of the inverting amplifier 4 are connected to input terminals, respectively, and the output terminal is connected to an output terminal 6.

The frequency characteristic dip of this comb filter is DC (
Direct current) IF, 2F, 3F, etc. are generated at positions that are integral multiples of the frequency F of the next lowest dip following the DC component.

The frequency F of the dip can be set by changing the delay time of the delay means 3, and this timbre forming device is provided for each of the plurality of sound sources.

In the above configuration, the delay time of the delay means 3 is controlled to change the dip of the comb filter in FIGS.
2), (4-3), and (4-4) to correspond to frequencies continuing to higher harmonics.

If you manually input a string vibration signal with many harmonics, such as string vibration detected by a pickup near the bridge, to input terminal 1,
A musical tone signal similar to that obtained when a pickup is provided at a position approximately 1/4 of the total length of the string as shown in FIG. 3 is obtained for each sound source.

FIG. 2 is a block diagram of a timbre forming device according to a second embodiment of the present invention.

An electric guitar 28 is provided with a divided pickup 26 that corresponds to a plurality of strings 27 and detects the vibration of each string independently.

The string vibration signal outputted from the pickup 26 is manually applied to the comb filter 20 to form a tone, and then outputted from the output terminal 29.

The embodiment of the comb filter 20 has the same structure and the same numbers as in FIG. 1.

In the above configuration, the dips IF, 2F, 3F, etc. of the comb-shaped filter are arranged in the same way as in Fig. 1, and the pickup is installed at a position about 1/4 of the total length of the string as shown in Fig. 3. By combining it with the harmonic signal detected by the pickup 26 near the bridge as shown in FIG. 2, the musical tone signal with the positional relationship between the string 37 and the pickup 39 as shown in FIG. can be obtained from string vibration signals with a large number of Then, by changing the delay time and changing the frequency characteristics, the pickup 39
By changing the position of the string, it is possible to obtain an effect similar to detecting a string vibration signal.

Although not shown in the embodiment, a timbre correction filter may be provided after the comb filter 20, or a plurality of comb filters may be connected in parallel or in series.

For example, by connecting two comb filters with different characteristics in series, it is possible to obtain a musical tone signal similar to that obtained with a humbucking pickup or the halftone setting of an electric guitar.

Specifically, the configuration is as shown in the block diagram of FIG.

Note that the halftone setting of an electric guitar refers to the state in which, in an electric guitar equipped with a single-coil pickup, the tone switch that switches the pickups is set to an intermediate position, and the pickups are connected in parallel.

FIG. 5 corresponds to the comb filter of FIG. 1 and the comb filter 20 of FIG. 2, and is another embodiment of the comb filter.

51 is an input terminal, 52 is a first comb filter, 53
is a first timbre correction filter; 54 is a second comb filter; 55 is a second timbre correction filter; and 56 is an output terminal.

The first comb filter 52 is composed of a delay means 521, an inverting amplifier 522, and an adder 523, and its frequency characteristic dip is DC (direct current) IF, 2F.
, 3F, . . . occur at frequencies that are integral multiples of the frequency F of the next lowest dip following the DC component.

The second comb filter 54 is composed of a delay means 541, a non-inverting amplifier 542, and an adder 543, and its frequency characteristic dip is IF, 3F, 5F, 7F,
. . . occur at frequencies that are odd multiples of the lowest dip frequency F.

Although the frequency at the dip position is F for both the first and second comb filters, the actual frequency at the dip position differs depending on each filter.

After each comb filter, timbre correction filters 53 and 55 are provided to correct the timbre of the output signal of the comb filter. The timbre correction filters 53 and 55 are general filters such as low-pass filters, bypass filters, band-pass filters, or combinations thereof, and filters with appropriate frequency characteristics may be provided as necessary. However, this filter is not necessarily necessary and may be omitted if unnecessary.

In the above configuration, by setting the delay times of the delay means 521 and 541 to appropriate values, it is possible to obtain the musical tone signal of the humbucking pickup or halftone setting.

Although the embodiments in this specification are described in analog form, the above-described comb filter and timbre correction filter can be easily realized digitally.

If the invention were to be implemented digitally, an analog-to-digital converter would be required between the comb filter 20 and the divided pickup 26, as shown in FIG.
In the musical tone forming apparatuses shown in FIGS. and 5, an analog-to-digital converter is required when the input signal is analog. In either case, a digital-to-analog converter is required when the signal is finally output as a musical tone signal.

[Effects of the Invention] As described above, according to the present invention, it is possible to obtain a string vibration signal similar to that detected by a pickup installed at an arbitrary position using only a divided pickup installed near the bridge, and Even without using electric stringed instruments,
For example, if a sampler or synthesizer can generate a string vibration signal or a musical tone similar to it, then it is possible to change the pickup position of an electric stringed instrument by changing the frequency characteristics of a square filter. This timbre-forming device has a wide range of applications, and even more effects can be obtained by combining multiple timbre-forming devices or correcting the timbre with a filter.

[Brief explanation of drawings]

Fig. 1 is a block diagram of a tone forming device which is a first embodiment of the present invention, Fig. 2 is a block diagram of a tone forming device which is a second embodiment of the present invention, and Fig. 3 is a block diagram of a tone forming device which is a second embodiment of the present invention. FIG. 4 is a diagram showing the state of string vibration, and FIG. 5 is another embodiment of the comb filter. 1.51...Input terminal, 2...Buffer amplifier, 3,521,541...Delay means,
4.522...Inverting amplifier, 542...
...Non-inverting amplifier, 5.52:3,543...
Adder, 6.29.56... Output terminal, 28.
...Electric guitar 27.37...Strings, 2
6,39.49...Pickup 20,5
2.54... Comb filter 53.55.
...Tone correction filter

Claims (2)

[Claims] (1) A timbre forming device characterized in that a comb filter is provided for each of a plurality of sound sources, and different frequency characteristics are set for each of the comb filters. (2) a plurality of strings and a plurality of pickups that independently detect string vibrations as electric signals corresponding to each string;
A timbre forming device comprising a plurality of comb-shaped filters connected correspondingly to each of the pickups, and different frequency characteristics are set for each of the comb-shaped filters.