JPS6326859Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a two-channel electronic musical instrument ensemble circuit using two speakers. It is known that when acoustic currents are passed through two speakers separated from each other, when the acoustic currents are in the same phase, the sound image from the speakers is localized to the center of the front, and when the acoustic currents are in opposite phase, there is no sense of localization of the sound image.

In conventional string ensemble circuits, etc., 2
Since the string signal current input to each speaker changes its phase based on a phase difference of 0°, the sound image from the two speakers appears to spread around the center of the front. If you let
The drawback is that this sense of spaciousness is diminished.

The present invention utilizes the above-mentioned phenomenon to create a sense of sound expansion even when a string ensemble circuit, chorus ensemble circuit, or brass ensemble circuit is connected to a speaker system that is extremely close to each other, such as a radio cassette. The first, second, and third signal delay circuits are configured to periodically vary the delay times of input sound source signals by shifting their phases from each other, and The output side of the delay circuit is connected to the input circuit of the first speaker via the mixing circuit, and the output sides of the second and third signal delay circuits are connected to the input circuit of the second speaker via the mixing circuit. In the ensemble circuit, the musical tone signal flowing through the input circuit is connected to one of the input circuits of the first and second speakers in a low frequency range with respect to the musical tone signal flowing to the other of the input circuits of the first and second speakers. It is characterized by the intervention of a phase circuit that is close to the same phase and has an opposite phase in the mid-to-high range.

An embodiment of the present invention applied to a string ensemble circuit will be described below with reference to the drawings.

In Figure 1, BBD is used as signal delay circuit 1.
1 ₁ , 1 ₂ , 1 ₃ and three BBDs _{1 1} , 1 ₂ , 1 ₃
Each input side of is connected to a string signal input terminal 5. 1st
The output sides of the second and second BBDs _{1 1} and 1 ₂ are connected to the input circuit 3 ₁ of the speaker 2 ₁ through a mixing circuit, and the output sides of the second and third BBDs _{1 2} and 1 ₃ are connected to the speaker 2 through the mixing circuit. ₂ input circuit 3 connected to ₂ . The string signal input terminal 5 receives a string signal generated from a sound source (not shown) through a filter and a crescendo circuit. Said BBD1 ₁ , 1 ₂ , 1 ₃
A clock pulse generation circuit 5 that supplies a clock to
are 3 modulated with mutually out-of-phase low-frequency signals.
Generates phase clock pulses. The above circuit is the same as a conventional string ensemble circuit.
Input circuit 3 _of speaker 2 ₁ Phase shift circuit 4 intervening in 1
consists of a phase shifter 4 ₁ and an inverting amplifier 4 ₂ , and the phase shifter 4 ₁ has a frequency - as shown by the broken line in FIG.
Since it has a phase shift characteristic and its output is inverted by the inverting amplifier 4 ₂ , the inverting amplifier 4 ₂ generates a signal with the characteristics as shown by the solid line in FIG. 2, that is, the phase shift is 0° in the bass range. ~90°, and in the mid-to-high range, signals from 90° to almost 180° (reverse phase) are output.

Thus, in the circuit shown in the first diagram, when a sound source signal is input to the string signal input terminal 5, the musical tone signal input to the speaker ₂₁ is close to the same phase as the musical tone signal flowing to the input circuit ₃₂ in the low range, and in the middle and high range. Then the phase will be reversed.

With the circuit configuration described above, the present invention has the effect of providing a sense of spaciousness of the sound image compared to the conventional system without causing discomfort due to the lack of localization of the sound image in the bass range.

In addition to the string ensemble circuit of the embodiment, the present invention can also be applied to a chorus ensemble circuit and a brass ensemble circuit.

[Brief explanation of the drawing]

Figure 1 is a block diagram of one embodiment of the present invention;
The figure shows a frequency characteristic diagram of the phase shift circuit 4. 1 ₁ , 1 ₂ , 1 ₃ ... BBD, 2 ₁ , 2 ₂ ... speakers, 3 ₁ , 3 ₂ ... input circuits of speakers _{2 1} , 2 ₂ ,
4... Phase shift circuit, 5... Clock pulse generation circuit.

Claims (1)

[Scope of utility model registration request] The first and second signals are arranged so that the delay times of the input sound source signals are periodically varied by shifting the phase from each other.
and a third signal delay circuit, the first and second signal delay circuits
The output side of the signal delay circuit is connected to the first signal through the mixing circuit.
In the ensemble circuit, the first and second signal delay circuits are connected to the input circuit of the second speaker, and the output sides of the second and third signal delay circuits are connected to the input circuit of the second speaker via the mixing circuit. One of the input circuits of the speaker has a phase in which the musical tone signal flowing to the input circuit is in phase with the musical tone signal flowing to the other of the input circuits of the first and second speakers, so that it is in phase with the musical tone signal flowing in the other input circuit of the first and second speakers, so that it is in phase with the musical tone signal flowing in the input circuit of the input circuit. An ensemble circuit for an electronic musical instrument characterized by intervening circuit connections.