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| Accordingly, it is a general object of the present invention to provide an improved biasing circuit ... |
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| Fiber optic alignment sleeve |
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| Connectors for optical fibers |
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| Circuitry for generating a sine wave and/or cosine wave from a pulse signal |
| The text of U.S. Pat. No. 3,938,394 is incorporated by reference at this point, specifically, ... |
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| Single mode fiber-to-channel waveguide through-line coupler |
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| Remote control system |
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| Electronic telephone set |
| OF THE PREFERRED EMBODIMENTS In FIG. 1 is shown the transmission circuit 1 connected to a ... |
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| Audio signal reproduction apparatus with frequency response dependent upon error rates |
| FIG. 1 shows a basic circuit of an audio reproduction circuit having a linear interpolation stage 2... |
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Device for modulating a musical tone signal to produce a rotating sound effect
| Details |
Inventors: Takada, Akira; Sakai, Tadao;
Assignee: Roland Corporation (Osaka, JA)
Primary Examiner: Jackmon; E. S.
Assistant Examiner:
Attorney, Agent or Firm:
A device for modulating a musical tone signal to produce a rotating sound effect. A first channel is coupled to an input for a musical tone and has an amplitude modulator therein. At least two further channels each having an amplitude modular therein are coupled to the input through a delay circuit. A frequency modulator is coupled to the amplitude modulator in the first channel and to the delay circuit means for frequency modulating the musical tone signals therein and phase shifters are coupled between the frequency modulator and the respective amplitude modulators in the further channels for shifting the phase of the musical tone signal in the channels. The outputs of the amplitude modulators are coupled acoustically or electrically for converting the modulated musical tone signals into sound, with the musical tone signal from said first channel being in the center of the reproduced sound and the musical tone signals from the further channels being on opposite sides of the musical tone signal from the first channel. The frequency modulator, amplitude modulators and phase shifters modulate the signals in the further channels so that when the volume level in one channel is a maximum the volume level in the other channel is a mimimum and vice versa and when the volume level in one channel is a maximum the modulated frequency is substantially a maximum and when the volume level in the other channel is a maximum the modulated frequency is substantially a minimum, and when the volume levels of the signals in the other channels are about equal the volume level and frequency of the signal in the first channel is successively a maximum and a minimum, whereby a rotating sound effect is produced. |
|
DETAILED DESCRIPTION OF THE INVENTION As seen in FIG.
2, the circuit system according to this invention receives a musical tone signal at the input terminal 1 and divides into two musical tone signals G.
sub.
1 and G.
sub.
2, the former tone signal G.
sub.
1 being supplied directly into an amplitude modulator 4B, and the latter tone signal G.
sub.
2 being supplied through a delay circuit 3 to the remaining two amplitude modulators 4A and 4C connected to the delay circuit.
The musical tone signal G.
sub.
2 is modulated by a delay time by a modulation wave f.
sub.
o, shown in FIG.
3(1), from a modulation signal generator 2 connected to the delay circuit 3, and the time phase of the musical signal G.
sub.
2 will be caused to advance or to slow down in accordance with the increase or decrease of the varying voltage of the modulation wave f.
sub.
o, and consequently there will be a frequency variation in accordance with the variation of the voltage of the modulation wave f.
sub.
0 per unit time, so that the musical tone signal G.
sub.
2 will become a frequency modulated signal as shown in FIG.
3 (2).
FIG.
3 (3) is a graph to show the frequency variation of the musical tone signal G.
sub.
2.
On the other hand, the modulation signal (about 0.
2 - 10 Hz) from the modulation signal generator 2 is supplied to the amplitude modulator 4B or as modulation wave f.
sub.
0, and is also supplied to a phase shifter P.
sub.
1 wherein its phase is shifted to produce a modulation wave f.
sub.
1, shown in FIG.
3(4).
This is in turn supplied to the amplitude modulator 4A, and also to a phase shifter P.
sub.
2, wherein it is again phase shifted to produce a modulation wave f.
sub.
2, shown in FIG.
3 (5), which is then supplied to the amplitude modulator 4C.
The modulation wave f.
sub.
0 is phase retarded by 90.
degree.
by the phase shifter P.
sub.
1 to produce modulation wave f.
sub.
1, and said modulation wave f.
sub.
1 is phase retarded by 180.
degree.
by the phase shifter P.
sub.
2 to produce modulation wave f.
sub.
2.
Consequently, the modulation wave f
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