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1. WO1979000728 - TRADUCTEUR DE SIGNAUX AVEC REGLAGE SILENCIEUX

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

CLAIMS

1. A signal translator, comprising a square wave translating device having an alternating current signal input for receiving alternating current signals and a square wave output for delivering square wave output
signals corresponding to said alternating current signals, said translating device having a switching input for
receiving a first control voltage for activating said translating device and a second control voltage for
squelching said translating device, and squelch control voltage generating means for receiving said alternating current signals and producing said first control voltage when said alternating current signals exceed a predetermined threshold level while producing said second control voltage when said alternating current signals are less than said threshold level, said squelch control
voltage generating means including control signal producing -means for converting said alternating current
signals into a corresponding control signal, and co pa-rator means for receiving said control signal and producing said first control voltage when said control signal exceeds an established level while producing said second control voltage when said control signal is less than said established level, whereby said translating device is activated when said control signal exceeds the established level but is squelched when said control signal is less than the established level.

2. A signal translator according to claim 1, in which said squelch control voltage generating means
includes rectifying means for producing a rectified
direct current signal in response to said alternating current signals, and integrating means for producing an integrated direct current signal in response to said

OMPI rectified direct current signal, said integrated direct current signal providing said control signal.

3. A signal translator according to claim 2, i which said squelch control voltage generating means includes regulating means for regulating and limiting the magnitude of said integrated direct current signal in excess of said established level.

4. A signal translator according to claim 3, i which said regulating means includes a Schottky diode connected to said integrating means.

5. A signal translator according to claim 2, in which said integrating means includes an integrating resistance in series with an integrating capacitor adapted to be charged and discharged through said
resistance, and regulating means for regulating and limiting the maximum magnitude of the integrated direct current signal across said capacitor to reduce the time required for said capacitor to discharge through said resistance.

6. A signal translator according to claim 5, in which said regulating means includes a Schottky diode connected across said capacitor.

■7. A signal translator according to any of the preceding claims, in which said comparator means includes an operational amplifier having an inverting input for receiving said control signal, said operational amplifier having a non-inverting input, means for producing a bias, voltage at said established level on said non-inverting input, said operational amplifier having an output, means connecting said last mentioned output to said switching input of said translating device, and a feedback resistance connected between said last mentioned output and said non-inverting input to provide a hysteresis action.

8. A signal translator according to claim 7, including a feedback capacitor connected in parallel with said feedback resistance.

9. A signal translator according to any of the preceding claims, in which said square wave translating device comprises an operational amplifier.