Cross-talk component cancellation circuit in an angle-modulated wave signal transmission system

Claim 2

A cross-talk component cancellation circuit in an angle-modulated wave signal system for receiving first and second angle-modulated wave signals on at least two channels, wherein a cross-talk component of the second angle-modulated wave signal is admixed with the first angle-modulated wave signal, said cross-talk component cancellation circuit comprising: means for phase inverting the second angle-modulated wave signal; first means for mixing respective portions of the second angle-modulated wave signal and the phase-inverted second angle-modulated wave signal with the first angle-modulated wave signal to produce a first means output signal; means responsive to a control signal for varying at least one respective portion of the second angle-modulated wave signal and the phase-inverted second angle-modulated wave signal for mixing by the first means; second means for mixing the first means output signal with the second angle-modulated wave signal and the phase-inverted second angle-modulated wave signal in respective specific mixing quantities thereby to produce third and fourth angle-modulated wave signals; means responsive to the third and fourth angle-modulated wave signals to produce said control signal for variably controlling the amount of said at least one respective portion and to supply said control signal to said varying means; and means coupled to said first means for obtaining the first angle-modulated wave signal the cross-talk component of which has been canceled by the first means.

Claim 3

A cross-talk component cancellation circuit as claimed in claim 1 in which said varying means is so variably controlled that, in resultant effect, the peak values of the envelopes of the third and fourth angle-modulated wave signals become equal.

Claim 4

A cross-talk component cancellation circuit as claimed in claim 1 in which said means for producing said control signal comprises means for respectively envelope detecting the third and fourth angle-modulated wave signals and means for comparing the voltages of the resulting outputs of said envelope detecting means and producing as output said control signal.

Claim 5

A cross-talk component cancellation circuit as claimed in claim 1 in which said varying means comprises variable attenuation means having a resistance value which is varied.

Claim 6

A cross-talk component cancellation circuit as claimed in claim 3 in which said means for producing as output said control signal further has means for blocking a DC component of the output of the envelope detecting means and means for rectifying the output of said DC component blocking means and supplying the resulting output thus rectified to said voltage comparing means, and said varying means variably controls said at least one respective portion in a manner such that the variations of the envelopes of the third and fourth angle-modulated wave signals will become equal to each other.

Claim 7

A cross-talk component cancellation circuit as claimed in claim 1 in which said means for producing said control signal is so organized to produce no control signal at an instant when the level of said first angle-modulated wave signal is zero or extremely small.

Claim 8

A cross-talk component cancellation circuit as claimed in claim 5 in which rectifying means comprises a rectifier which is applied with a bias voltage when the level of said input angle-modulated wave signal is zero or extremely small.

Claim 9

A cross-talk component cancellation circuit as claimed in claim 1 in which said first means comprise first resistance means for mixing the second angle-modulated wave signal with the first angle-modulated wave signal and second resistance means for mixing the phase-inverted second angle-modulated wave signal with the first angle-modulated wave signal; said varying means comprises first and second variable resistance means which are respectively connected in series with the first and second resistance means and for varying respective resistance values by being applied with control signals from the control signal producing means; and said first and second variable resistance means are so organized to assume their OFF states at an instant when the level of the control signal becomes zero or an extremely small value whereby a mixing operation of the mixing means does not take place.

Claim 10

A cross-talk component cancellation circuit as claimed in claim 1 which further comprises synchronous detection means which is supplied with said first and second angle-modulated wave signals, detects a coincidence of the angle deviations of said signals, and produces a signal for stopping substantially the mixing operation of the first means when the angle deviations are coincident.

Claim 11

A cross-talk component cancellation circuit in an angle-modulated wave signal system for receiving first and second angle-modulated wave signals on at least two channels, wherein a cross-talk component of the second angle-modulated wave signal is admixed with the first angle-modulated wave signal, said cross-talk component cancellation circuit comprising: first phase inverting means for phase inverting the second angle-modulated wave signal; first means for mixing first respective portions of the second angle-modulated wave signal and the phase-inverted second angle-modulated wave signal with the first angle-modulated wave signal to produce a first means output signal; first variable means responsive to a first control signal for varying at least one of said first respective portions of the second angle-modulated wave signal and the phase-inverted second angle-modulated wave signal for mixing by the first means; second means for mixing the first means output signal with the second angle-modulated wave signal and the phase-inverted second angle-modulated wave signal in respective specific mixing quantities thereby to produce third and fourth angle-modulated wave signals; first control signal producing means to produce said first control signal in response to the third and fourth angle-modulated wave signals for variably controlling the amount of said at least one of said first respective portions and to supply said first control signal to said first variable means; means for phase shifting the second angle-modulated wave signal; second phase inverting means for phase inverting the phase shifted second angle-modulated wave signal; third means for mixing second respective portions of the phase shifted second angle-modulated wave signal and the phase shifted and phase-inverted second angle-modulated wave signal with the first means output signal to produce a third means output signal; second variable means responsive to a second control signal for varying at least one of said second respective portions of the phase shifted second angle-modulated wave signal and the phase shifted and phase-inverted second angle-modulated wave signal for mixing by the third means; fourth means for mixing the third means output signal with the phase shifted second angle-modulated wave signal and the phase shifted and phase-inverted second angle-modulated wave signal in respective specific mixing quantities thereby to produce fifth and sixth angle-modulated wave signals; second control signal producing means to produce said second control signal in response to the fifth and sixth angle-modulated wave signals for variably controlling the amount of said at least one of said second respective portions and to supply said second control signal to said second variable means; and means coupled to said third mixing means for obtaining the first angle-modulated wave signal the cross-talk component of which has been canceled by the first, second, third and fourth mixing means.

Claim 12

A cross-talk component cancellation circuit in an angle-modulated wave signal system for receiving first and second angle-modulated wave signals on at least two channels, wherein a cross-talk component of the second angle-modulated wave signal is admixed with the first angle-modulated wave signal, said cross-talk component cancellation circuit comprising: first phase inverting means for phase inverting the second angle-modulated wave signal; first means for mixing first respective portions of the second angle-modulated wave signal and the phase-inverted second angle-modulated wave signal with the first angle-modulated wave signal to produce a first means output signal; first variable means responsive to a first control signal for varying at least one of said first respective portions of the second angle-modulated wave signal and the phase-inverted second angle-modulated wave signal for mixing by the first means; second means for mixing the first means output signal with the second angle-modulated wave signal and the phase-inverted second angle-modulated wave signal in respective specific mixing quantities thereby to produce third and fourth angle-modulated wave signals; first control signal producing means to produce said first control signal in response to the third and fourth angle-modulated wave signals for variably controlling the amount of said at least one of said first respective portions and to supply said first control signal to said first variable means; means for phase shifting the second angle-modulated wave signal; second phase inverting means for phase inverting the phase shifted second angle-modulated wave signal; third means for mixing second respective portions of the phase shifted second angle-modulated wave signal and the phase shifted and phase-inverted second angle-modulated wave signal with the first means output signal to produce a third means output signal; second variable means responsive to a second control signal for varying at least one of said second respective portions of the phase shifted second angle-modulated wave signal and the phase shifted and phase-inverted second angle-modulated wave signal for mixing by the third means; fourth means for mixing the third means output signal with the phase shifted second angle-modulated wave signal and the phase shifted and phase-inverted second angle-modulated wave signal in respective specific mixing quantities thereby to produce fifth and sixth angle-modulated wave signals; second control signal producing means to produce said second control signal in response to the fifth and sixth angle-modulated wave signals for variably controlling the amount of said at least one of said second respective portions and to supply said second control signal to said second variable means; and means coupled to said third mixing means for obtaining the first angle-modulated wave signal the cross-talk component of which has been canceled by the first, second, third and fourth mixing means.