System for electronically simulating radiation effects produced by a rotary loudspeaker
AssigneeCBS Inc.
InventorRobert A. Finch
Life of this patent
Estimating the term…
Abstract
A device for electronically simulating vibrato and tremulant effects and the radiation effects produced by a rotary loudspeaker with the aid of two loudspeakers, in which a musical tone signal is applied to a variable delay device associated with one of the loudspeakers. The frequency modulated signal produced by the variable delay device is also subjected to amplitude modulation, controlled in synchronism with the variable delay device, and the resulting composite signal applied to the other loudspeaker. Additionally, the high frequency components of the frequency modulated signal from the variable delay device are summed, in and out of phase relationship, with the composite amplitude modulated signal to simulate the effect of a rotating high frequency horn radiator.
Claims24
Circuit for use with two proximately positioned loudspeakers for electronically producing an effect which simulates the radiation of sound by a rotary loudspeaker, said circuit comprising:
- means for generating a sub-audio frequency, substantially sinusoidal, modulating signal;
- variable delay means connected to receive an audio input signal and responsive to said modulating signal to modulate the frequency of said audio input signal;
- means connected to the output of said variable delay means adapted to apply to a first of said loudspeakers the signal modulated in frequency;
- an amplitude modulator connected to receive said frequency modulated signal from said variable delay means and responsive to said modulating signal to modulate the amplitude of said frequency modulated signal to produce a composite amplitude modulated frequency modulated output signal;
- and
- means connected to the output of said amplitude modulator adapted to apply said composite output signal to a second of said loudspeakers.
System for modulating a musical tone signal to produce an effect which simulates the radiation of sound by a rotary loudspeaker, said system comprising:
- means for generating a sub-audio, frequency, substantially sinusoidal, modulating signal;
- a first signal channel containing a frequency modulator connected to receive a musical tone signal and responsive to said modulating signal to modulate the frequency of said musical tone signal, and first transducer means for converting the frequency modulated tone signal into sound;
- and
- a second signal channel containing an amplitude modulator connected to receive said frequency modulated tone signal from said frequency modulator and responsive to said modulating signal to modulate the amplitude of said frequency modulated tone signal and produce a composite amplitude modulated-frequency modulated output signal having maximum amplitude when said frequency modulated signal is in transition from sharp to flat relative to said input tone signal and having minimum amplitude when said frequency modulated signal is in transition from flat to sharp, and second transducer means for converting the said composite output signal into sound;
- said first and second transducers being positioned sufficiently proximate each other that the sound therefrom is acoustically mixed.
Circuit for producing a modulated musical tone signal which when converted to sound by two proximately positioned loudspeakers produces an effect simulative of the radiation of sound by a rotary loudspeaker, said circuit comprising:
- means for generating a sub-audio frequency, substantially sinusoidal, modulating signal;
- means responsive to said modulating signal for modulating the frequency of a musical tone signal and adapted to apply said frequency modulated tone signal to a first of said loudspeakers;
- an amplitude modulator connected to receive said frequency modulated signal and responsive to said modulating signal for modulating the amplitude of said frequency modulated signal to produce a composite output signal;
- and
- means adapted to apply the output of said amplitude modulator to the second of said loudspeakers.
Circuit for modulating a musical tone signal, which modulated signal when converted to sound by two proximately positioned loudspeakers produces an effect which simulates the radiation of sound by a rotary loudspeaker, said circuit comprising:
- means for generating a sub-audio frequency, substantially sinusoidal, modulating signal;
- a frequency modulator connected to receive a musical tone signal and responsive to said modulating signal to modulate the frequency of said musical tone signal;
- means connected to the output of said frequency modulator adapted to apply to a first of said loudspeakers the signal modulated in frequency;
- an amplitude modulator connected to receive the frequency modulated tone signal from said frequency modulator and responsive to said modulating signal to modulate the amplitude of said frequency modulated tone signal to produce a composite output signal;
- and
- means connected to the output of said amplitude modulator adapted to apply said composite signal to the second of said loudspeakers.
Circuit for modulating a musical tone signal to produce an effect which simulates the radiation of sound by a rotary loudspeaker, said circuit comprising:
- means for generating a sub-audio frequency, substantially sinusoidal, modulating signal;
- a frequency modulator connected to receive a musical tone signal and responsive to said modulating signal to modulate the frequency of said musical tone signal;
- means connected to the output of said frequency modulator for applying the signal modulated in frequency to a first stationary transducer for converting the frequency-modulated tone signal into sound;
- an amplitude modulator connected to receive the frequency-modulated signal from said frequency modulator and responsive to said modulating signal to modulate the amplitude of said frequency-modulated signal to produce a composite output signal, and
- means connected to the output of said amplitude modulator for applying said composite output signal to a second stationary transducer for converting said composite signal into sound.
System for modulating a musical tone signal to produce a tremolo effect when acoustically reproduced, said system comprising:
- means for generating a sub-audio frequency, substantially sinusoidal, modulating signal;
- a frequency modulator connected to receive a musical tone signal and responsive to said modulating signal to modulate the frequency of said musical tone signal;
- an amplitude modulator connected to receive the frequency modulated tone signal from said frequency modulator and responsive to said modulating signal to modulate the amplitude of said frequency modulated tone signal to produce a composite signal, said amplitude modulator inverting the phase of the frequency-modulated signal it receives from said frequency modulator;
- a high-pass filter connected to receive said frequency modulated signal from said frequency modulator;
- a summing amplifier connected to receive at its input selected frequency components of the composite signal from said amplitude modulator and also the higher frequencies of the frequency modulated tone signal, without phase inversion, from said high-pass filter, for summing said composite signal and the higher frequency components of said frequency modulated tone signal and modulating the amplitude of the higher frequency components of said frequency modulated tone signal;
- and
- a first stationary transducer connected to receive the output signal from said summing amplifier for converting said output signal into sound.
Dependencies are inferred from the claim text.