US3119027A - Signal actuated control circuit - Google Patents

Signal actuated control circuit Download PDF

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Publication number
US3119027A
US3119027A US19314A US1931460A US3119027A US 3119027 A US3119027 A US 3119027A US 19314 A US19314 A US 19314A US 1931460 A US1931460 A US 1931460A US 3119027 A US3119027 A US 3119027A
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US
United States
Prior art keywords
circuit
transistor
capacitance
capacitor
emitter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US19314A
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English (en)
Inventor
Claude M Faust
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Code-A-Phone Electronics Inc
Original Assignee
Code-A-Phone Electronics Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to NL260729D priority Critical patent/NL260729A/xx
Priority to NL122369D priority patent/NL122369C/xx
Application filed by Code-A-Phone Electronics Inc filed Critical Code-A-Phone Electronics Inc
Priority to US19314A priority patent/US3119027A/en
Priority to FR853122A priority patent/FR1281078A/fr
Priority to BE601953A priority patent/BE601953A/fr
Priority to SE3411/61A priority patent/SE310899B/xx
Priority to DEF33583A priority patent/DE1242703B/de
Application granted granted Critical
Publication of US3119027A publication Critical patent/US3119027A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/64—Automatic arrangements for answering calls; Automatic arrangements for recording messages for absent subscribers; Arrangements for recording conversations
    • H04M1/65—Recording arrangements for recording a message from the calling party
    • H04M1/654—Telephone line monitoring circuits therefor, e.g. ring detectors
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/28—Modifications for introducing a time delay before switching
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
    • H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
    • H03K3/53—Generators characterised by the type of circuit or by the means used for producing pulses by the use of an energy-accumulating element discharged through the load by a switching device controlled by an external signal and not incorporating positive feedback
    • H03K3/57—Generators characterised by the type of circuit or by the means used for producing pulses by the use of an energy-accumulating element discharged through the load by a switching device controlled by an external signal and not incorporating positive feedback the switching device being a semiconductor device
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/64—Automatic arrangements for answering calls; Automatic arrangements for recording messages for absent subscribers; Arrangements for recording conversations
    • H04M1/65—Recording arrangements for recording a message from the calling party

Definitions

  • This invention pertains to electric control circuits and relates particularly to a control circuit in which the control of an electric load is dependent upon predetermined characteristics of an electrical input signal.
  • Another important object of this invention is the provision of a control circuit by which an electric load is maintained activated by intermittent electrical input signals and is deactivated after a predetermined period of time following the introduction of a steady electrical input signal.
  • Still another important object of the present invention is the provision of a control circuit of the class described in which means is provided for varying the aforesaid predetermined periods of time.
  • Still another important object of this invention is the provision of a signal actuated control circuit which is characterized by the absence of mechanical relays.
  • a further specific objective of the present invention is to provide a voice actuated control circuit for use in telephone answering and recording apparatus, which circuit functions to maintain the apparatus activated by intermittent electrical input signals derived from speech received by the apparatus from a calling party, wherein the apparatus is deactivated either when a silent period following speech exceeds a predetermined maximum, or after a predetermined time following the initiation of the dial tone in a telephone line.
  • a still further object of the present invention is to provide a signal actuated control circuit which is of simplified construction for economical manufacture and provides long and faithful operation with a minimum of maintenance.
  • one side of the capacitor is connected through the resistance 12 to a terminal 14 of a source of negative potential.
  • the opposite side of the capacitor is connected through the series arrangement of the diode rectifier 16 and potentiometer 18 to the base of the transistor 20.
  • the emitter of this transistor is connected to a common ground or other source of potential which is positive with respect to the negative potential supplied at the terminal 14.
  • the resistance 22 interconnects the base and the emitter to provide cut-off biasing for the transistor.
  • a second capacitor 24 is connected at one end between the rectifier 16 and potentiometer 18 and at the opposite 3,119,027 Patented Jan. 21, 1964 ice end to the ground or positive potential, to charge with the first mentioned capacitor 10.
  • the charging path of the capacitor 10 is shunted by the transistor 26 whose collector is connected between the capacitor 10 and resistance 12 and whose emitter is connected to the common ground or positive potential.
  • the base and emitter of the transistor 26 are interconnected by the cut-off biasing resistance 28.
  • this transistor circuit provides a discharge path for the capacitor 10 through the diode rectifier 30 which is connected at its input side to the common ground or positive potential and at its output side between the capacitor 10 and the input of the first mentioned diode rectifier 16.
  • the arrangement of this second rectifier functions to divert the charging path for the capacitor 10 through the transistor 20, and the arrangement of the first mentioned rectifier 16 functions to divert the discharge of the second mentioned capacitor 24 through the transistor 20.
  • the base of the transistor 26 is connected through the filter capacitor 32 and resistance 34 to the output side of a diode rectifier 36, the input side of which is connected to an output terminal 38 of a source of electrical input signals.
  • the other output terminal 40 is connected to the common ground or positive potential.
  • the control circuit described hereinbefore functions to control the activation of an electric load of any desired type.
  • the load may be an indicator lamp or alarm, a recording instrument, a motor control, a capacitor in the circuit of another control transistor, and many others.
  • the load is a relay coil 42 connected at one end to the collector of the transistor 20 and at the other end to the terminal 14 of the negative potential supply.
  • the switch contacts 44, 46 associated with the relay coil are arranged in an electric circuit, the terminals 48, 50 of which may be connected to a device to be controlled, such as the telephone answering and recording apparatus mentioned hereinbefore.
  • the operation of the control circuit disclosed hereinbefore now will be described with reference to a telephone answering and recording apparatus.
  • the input terminals 38, 40 are connected to the output of a telephone receiver amplifier and the terminals 48, 50 are connected to the electric circuit of the telephone answering and recording apparatus.
  • the terminal 14 then is connected, as by means of a switch controlled by the apparatus, to the source of negative potential. Negative current thus is passed through the resistor 12, capacitor 10, rectifier 16, potentiometer 13 and base-emitter circuit of the transistor 20, to the common ground or positive potential.
  • the capacitors 10 and 24 thus begin to charge, resulting in current flow in the base-emitter and emittercollector circuits of the transistor 20.
  • the emitter-collector circuit thus functions as a switch in the circuit of the relay coil 42, the switch being actuated by current How in the base-emitter circuit.
  • the relay coil 42 thus is activated, closing the associated switch contacts in the circuit of the apparatus.
  • the time required to fully charge the capacitor 10 is determined by the setting of the potentiometer 18, and this may be varied over a considerable range to provide the charge time desired. As an illustration, a charging time of about 15 seconds has been found to be desirable for the illustrated purpose.
  • capacitor 24 has completely discharged, let it be assumed that a calling party has begun to speak his message.
  • the resulting alternating current signal to the input terminal 38 is rectified at rectifier 36 and passed through the filter circuit to the base of the transistor 26.
  • this transistor Upon activation of this transistor its resistance is lowered, permitting the capacitor 10 to discharge through the collector-emitter circuit.
  • the collector-emitter circuit of transistor 26 functions as a switch in the discharge circuit of capacitor 10, the switch being actuated by current fiow in the base-emitter circuit.
  • the capacitor 10 discharges during the intervals of speech signals, and since its discharge path does not include transistor 20 current ceases to flow through it from capacitor 10. However, during these intervals the capac itor 24 discharges through the transistor 20 to maintain the latter activated and the relay energized. A short discharge time of about three seconds for this capacitor has been found to be quite suitable for normal speech characteristics.
  • the dial tone on the telephone line causes the transistor 26 to be activated, whereupon the capacitor 10 discharges through it. Since the capacitor cannot recharge while the transistor 26 is activated, current will not flow in the base-emitter circuit of the transistor 20, after the second capacitor 24 has discharged through it, and hence the relay coil 42 will be deenergized.
  • an electric load such as the relay coil 42 is maintained energized as long as there is impressed upon the base of transistor 26 an intermittent electrical signal derived from an intermittent alternating current signal applied to input terminal 38.
  • This alternating current signal may be provided by the telephone message described hereinbefore, or from'a radio signal or otherhigh frequency source.
  • the electric load is deactivated when the intermittent signal is replaced either by a steady signal or by no signal, for a period of time determined by the setting of the potentiometer 18 which determines the charge time for the capacitor 10.
  • the setting of the potentiometer also determines the discharge time for the capacitor 24, and this normally is chosen to be compatible with the time duration of the intermittent signal.
  • a signal actuated control circuit for an electric load circuit comprising a capacitance, a charging circuit for the capacitance, first switch means adapted for connection in the load circuit, first electrical switch actuator means including rectifier means for the first switch means connected in series with the capacitance in the said charging circuit for actuating the first switch means during charging of the capacitance, second switch means including an electric circuit releasably shunting the capacitance for discharging the latter, and second electrical switch actuator means for the second switch means and having an electric circuit, the second switch actuator means being operable by an electric signal to actuate the second switch means and shunt and discharge the capacitance, whereby to deactivate the first switch actuator means during discharge of the capacitance.
  • first switch means comprises the collector-emitter circuit or" a first transistor
  • first switch actuator means comprises the base-emitter circuit of the first transistor
  • second switch means comprises the collector-emitter circuit of a second tran sistor
  • second switch actuator means comprises the base-emitter circuit of the second transistor
  • the circuit of claim 1 including means in the charging circuit for varying the charging time for the capacitance.
  • a signal actuated control circuit for an electric load circuit comprising a capacitance, a charging circuit for the capacitance, first switch means adapted for connection in the load circuit, first electrical switch actuator means including rectifier means for the first switch means connected in series with the capacitance in said charging circuit for actuating the first switch means during charging of the capacitance, second switch means including an electric circuit releasably shunting the capacitance for discharging the latter, second electrical switch'actuator means for the second switch means and having an electric circuit, the second switch actuator means being operable by an electric signal to actuate the second switch means and shunt and discharge the capacitance, and a second capacitance shunting the first switch actuator means and connected to the said charging circuit for charging with the first named capacitance, the second capacitance functioning to discharge following full charge or during discharge of the first named capacitance, whereby to maintain the first switch actuator means activated for the additional time of discharge of the second capacitance.
  • first switch means comprises the collector-emitter circuit of a first transistor
  • first switch actuator means comprises the base-emitter circuit of the first transistor
  • second switch means comprises the collector-emitter circuit of a second transistor
  • second switch actuator means comprises the base-emitter circuit of the second transistor
  • the circuit of claim 4 including means in the charging circuit for varying the charging and discharging time for the capacitances.
  • a signal actuated control circuit for an electric load circuit comprising a capacitance, a charging circuit for the capacitance, a first transistor, the collector-emitter circuit of the first transistor being adapted for connection in the load circuit, the base-emitter circuit of the first transistor being connected in series with the capacitance in the said charging circuit, a second transistor, the collector-emitter circuit of the second transistor being connected across the capacitance, the base of the second transistor being adapted for connection to a source of electric signals for activating the second transistor, a second capacitance shunting the base-emitter circuit of the first transistor, and rectifier means in the charging circuit arranged to divert the discharge of the second capacitance through the base-emitter circuit of the first transistor.
  • the circuit of claim 9 including means in the charging circuit for varying the charging and discharging time for the capacitances.
  • the circuit of claim 9 including rectifier means in the collector-emitter circuit of the second transistor.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)
US19314A 1960-04-01 1960-04-01 Signal actuated control circuit Expired - Lifetime US3119027A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
NL260729D NL260729A (it) 1960-04-01
NL122369D NL122369C (it) 1960-04-01
US19314A US3119027A (en) 1960-04-01 1960-04-01 Signal actuated control circuit
FR853122A FR1281078A (fr) 1960-04-01 1961-02-17 Montage de commande contrôlé par un signal
BE601953A BE601953A (fr) 1960-04-01 1961-03-29 Montage de commande contrôlé par un signal
SE3411/61A SE310899B (it) 1960-04-01 1961-03-30
DEF33583A DE1242703B (de) 1960-04-01 1961-04-01 Steuerschaltung fuer das Ein- und Ausschalten von Telefonanrufbeantwortungs- und -anruf-Aufzeichnungsgeraeten

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US19314A US3119027A (en) 1960-04-01 1960-04-01 Signal actuated control circuit

Publications (1)

Publication Number Publication Date
US3119027A true US3119027A (en) 1964-01-21

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ID=21792559

Family Applications (1)

Application Number Title Priority Date Filing Date
US19314A Expired - Lifetime US3119027A (en) 1960-04-01 1960-04-01 Signal actuated control circuit

Country Status (6)

Country Link
US (1) US3119027A (it)
BE (1) BE601953A (it)
DE (1) DE1242703B (it)
FR (1) FR1281078A (it)
NL (2) NL260729A (it)
SE (1) SE310899B (it)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3217172A (en) * 1961-08-01 1965-11-09 Burroughs Corp Delay circuit employing coupling circuit between two time delay circuits
US3226563A (en) * 1961-03-08 1965-12-28 John C Lovci Teletype current supply system
US3284791A (en) * 1963-03-25 1966-11-08 Aseco Inc Near alarm receiver having-time delay of discharge type
US3286101A (en) * 1963-10-16 1966-11-15 Massachusetts Inst Technology Sample and hold circuit
US3341712A (en) * 1963-01-23 1967-09-12 Fifth Dimension Inc Current sensing timing circuits
US3482148A (en) * 1966-12-28 1969-12-02 Bell Telephone Labor Inc Pulse driven circuit for activating an electromagnetic device during and for a predetermined interval longer than the input pulse width
US3505541A (en) * 1966-07-29 1970-04-07 Rca Corp Electronic timer
US3577087A (en) * 1968-09-27 1971-05-04 Rca Corp Sequence {37 and{38 {0 gate with resetting means
US3584240A (en) * 1969-04-02 1971-06-08 Rca Corp Trigger pulse circuits
US3600610A (en) * 1969-07-09 1971-08-17 Xerox Corp Time delay circuit for a radiant energy protective apparatus
US3604956A (en) * 1969-07-01 1971-09-14 Us Navy Radiation immune timing circuit
US3852646A (en) * 1970-12-28 1974-12-03 Design Elements Inc Solenoid drive circuit
US4330720A (en) * 1978-11-24 1982-05-18 Gould Inc. Electrographic recording apparatus employing an improved drive circuit

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2606251A (en) * 1944-04-24 1952-08-05 Roelof M M Oberman Signaling system for telegraph links
US2617024A (en) * 1948-08-31 1952-11-04 Rca Corp Time delay circuits
US2653233A (en) * 1951-08-25 1953-09-22 Westinghouse Electric Corp Electrical apparatus
US2845548A (en) * 1956-04-25 1958-07-29 Westinghouse Electric Corp Static time delay circuit
US2902658A (en) * 1957-05-01 1959-09-01 Electrocircuits Inc Apparatus for generating frequency modulated signals
US2998532A (en) * 1958-05-21 1961-08-29 Thompson Ramo Wooldridge Inc Linear ramp voltage wave shape generator

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2606251A (en) * 1944-04-24 1952-08-05 Roelof M M Oberman Signaling system for telegraph links
US2617024A (en) * 1948-08-31 1952-11-04 Rca Corp Time delay circuits
US2653233A (en) * 1951-08-25 1953-09-22 Westinghouse Electric Corp Electrical apparatus
US2845548A (en) * 1956-04-25 1958-07-29 Westinghouse Electric Corp Static time delay circuit
US2902658A (en) * 1957-05-01 1959-09-01 Electrocircuits Inc Apparatus for generating frequency modulated signals
US2998532A (en) * 1958-05-21 1961-08-29 Thompson Ramo Wooldridge Inc Linear ramp voltage wave shape generator

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3226563A (en) * 1961-03-08 1965-12-28 John C Lovci Teletype current supply system
US3217172A (en) * 1961-08-01 1965-11-09 Burroughs Corp Delay circuit employing coupling circuit between two time delay circuits
US3341712A (en) * 1963-01-23 1967-09-12 Fifth Dimension Inc Current sensing timing circuits
US3284791A (en) * 1963-03-25 1966-11-08 Aseco Inc Near alarm receiver having-time delay of discharge type
US3286101A (en) * 1963-10-16 1966-11-15 Massachusetts Inst Technology Sample and hold circuit
US3505541A (en) * 1966-07-29 1970-04-07 Rca Corp Electronic timer
US3482148A (en) * 1966-12-28 1969-12-02 Bell Telephone Labor Inc Pulse driven circuit for activating an electromagnetic device during and for a predetermined interval longer than the input pulse width
US3577087A (en) * 1968-09-27 1971-05-04 Rca Corp Sequence {37 and{38 {0 gate with resetting means
US3584240A (en) * 1969-04-02 1971-06-08 Rca Corp Trigger pulse circuits
US3604956A (en) * 1969-07-01 1971-09-14 Us Navy Radiation immune timing circuit
US3600610A (en) * 1969-07-09 1971-08-17 Xerox Corp Time delay circuit for a radiant energy protective apparatus
US3852646A (en) * 1970-12-28 1974-12-03 Design Elements Inc Solenoid drive circuit
US4330720A (en) * 1978-11-24 1982-05-18 Gould Inc. Electrographic recording apparatus employing an improved drive circuit

Also Published As

Publication number Publication date
NL122369C (it)
FR1281078A (fr) 1962-01-08
DE1242703B (de) 1967-06-22
SE310899B (it) 1969-05-19
NL260729A (it)
BE601953A (fr) 1961-07-17

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