Stereophonic sound synthesizer

Details Stereophonic sound synthesizer Stereophonic sound synthesizer

1979-03-09

1980-12-16

Olms, Douglas W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358198, H04S 500

Patent

active

042399394

ABSTRACT:
A system is provided which synthesizes stereophonic sound by developing two separate sound channels from a single monophonic sound source. A synthetic stereophonic sound system constructed in accordance with the principles of this invention may be advantageously utilized in combination with a visual display such as a television receiver. A monaural signal is applied as the input signal for a transfer function circuit of the form H(s), which modulates the intensity of the monaural signal as a function of frequency. The intensity modulated H(s) signal is coupled to a reproducing loudspeaker, and comprises one channel of the synthetic stero system. The H(s) signal is also coupled to one input of a differential amplifier. The monaural signal is coupled to the other input of the differential amplifier to produce a difference signal which is the complement of the H(s) signal. The difference signal is coupled to a second reproducing loudspeaker, which comprises the second channel of the synthetic stereo system. In accordance with a preferred embodiment of the present invention, a stereo synthesizer is utilized as the sound reproducing system of a television receiver, with the reproducing loudspeakers located on either side of the kinescope. The amplitude -vs- frequency response curves of the two output channels have crossover points at which the amplitudes of the two response curves are equal, which effectively centers sounds at these frequencies between the loudspeakers. Two crossover frequencies are chosen to occur at approximately the frequency of peak intensity of the human voice, and at the center frequency of the second (articulation) formant frequencies of the human voice so as to effectively center voices on the kinescope while preserving the ambience effect of other, more randomly distributed sound signals. Centering the second formant frequencies also provides increased quality in the reproduction of speech sounds.

REFERENCES:
patent: 2616970 (1952-11-01), Broos
patent: 3056854 (1962-10-01), Katzenstein
patent: 3670106 (1972-06-01), Orban
patent: 4137510 (1979-01-01), Iwahara
"Constant-Voltage Crossover Network Design", by Small in Proceedings I.R.E.E. Australia, vol. 31, No. 3, Mar. 1970, pp. 66-73.
"An Artificial Stereophonic Effect Obtained From a Single Audio Signal", by Schroeder in Journal of the Audio Engineering Society, Apr. 1958, vol. 6, No. 2, pp. 74-79.
"A Rational Technique for Synthesizing Pseudo-Stereo From Monophonic Sources", by Orban in Journal of the Audio Engineering Society, Apr. 1970, vol. 18, No. 2, pp. 157-164.

Affiliated with

Also associated with

Rating

Stereophonic sound synthesizer does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Stereophonic sound synthesizer, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Stereophonic sound synthesizer will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-609361