Title: Audio signal mixing system

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Claims: I claim as my invention:

1. An audio signal mixing system comprising:

a. left and right channels for transmitting stereophonic left and right signals L and R each, respectively, containing a monaural signal;

b. a first circuit for eliminating said monaural signal contained in either one of said left and right signals L and R; and

c. a second circuit supplied with an additional signal and mixing it with either one of said left and right signals L and R, whereby said either one of said left and right signals L and R and said additional signal are passed by one of said left and right channels, and the other one of the L and R signals and the monaural signal are passed by the other channel.

2. An audio signal mixing system as claimed in claim 1, wherein said first circuit comprises a first variable resistor with a slide contact arm connected between the left and right channels and said second circuit comprises a second variable resistor with a slide contact arm connected between the left and right channels, a signal of opposite polarity to said stereophonic signals L and R applied to said slide contact arm of said first variable resistor and said additional signal applied to said slide contact arm of said second variable resistor.

3. An audio signal mixing system as claimed in claim 2, wherein said slide contact arms of said first and second variable resistors are mechanically ganged together.

4. An audio signal mixing system as claimed in claim 2, wherein said slide contact arm of said second variable resistor is connected at one end of said second variable resistor to a microphone which furnishes said additional signal.

5. An audio signal mixing system as claimed in claim 4, wherein a delay circuit is connected between said microphone and the slide contact arm of said second variable resistor.

6. An audio signal mixing system as claimed in claim 2, wherein said left channel includes a first transistor having base, emitter and collector electrodes and said right channel includes a second transistor having base, emitter and collector electrodes, and the collector electrodes of said first and second transistor connected together and to said slide contact arm of said first variable resistor.

7. An audio signal mixing system as claimed in claim 1, wherein said first circuit includes a first variable resistor which has a slide contact arm and is connected between said left and right channels, first and second filters respectively connected to said left and right channels and passing signals corresponding to a frequency band of a human voice, and a means for applying the output signals from said first and second filters to said slide contact arm of said first variable resistor, and said second circuit includes a second variable resistor which is connected between said left and right channels and has a slide contact arm.

8. An audio signal mixing system as claimed in claim 7, further comprising a circuit for producing a signal which is the sum of said stereophonic left and right signals, L and R, a third filter connected to said sum signal producing circuit and passing a signal with a frequency band of a human voice, and a means for supplying the output signal from said third filter to said slide contact arm of said second variable resistor, whereby the signal with said frequency band of a human voice in said stereophonic signals becomes the additional signal.

9. An audio signal mixing system as claimed in claim 8, wherein a signal emphasis circuit is provided between said sum signal producing circuit and said slide contact arm of said second variable resistor, said signal emphasis circuit includes delay signal means.

Other info:

Inventors: Osakabe, Yoshio (Yokohama, JA)

Application Number: 441206
Filing Date: 1974-02-11
Publication_date: 1976-03-02
Assignee: Sony Corporation (Tokyo, JA)
Primary Class(es): 381/1
Other Classes:
US Patent Ref:

3200199	Aug, 1965	Bang	179/1.
3249696	May, 1966	Van Sickle	179/1.
3272906	Sep, 1966	De Vries et al.	179/1.
3478167	Nov, 1969	Sorkin	179/1.
3518375	Jun, 1970	Hawkins	179/1.
3665105	May, 1972	Chowning	179/1.

Other Refs:
Primary Examiner: Claffy, Kathleen H.
Assistant Examiner: Olms, Douglas W.
Attorney: Hill, Gross, Simpson, Van Santen, Steadman, Chiara & Simpson