US3697982A - Tone control signal circuit having tone pulses followed by continuous tone - Google Patents

Tone control signal circuit having tone pulses followed by continuous tone Download PDF

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Publication number
US3697982A
US3697982A US94825A US3697982DA US3697982A US 3697982 A US3697982 A US 3697982A US 94825 A US94825 A US 94825A US 3697982D A US3697982D A US 3697982DA US 3697982 A US3697982 A US 3697982A
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US
United States
Prior art keywords
circuit
multivibrator
annunciator
resistor
transistor
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Expired - Lifetime
Application number
US94825A
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English (en)
Inventor
Katsumi Kawaki
Masashi Usui
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TOKYO TOKEI SEIZO KAISHA Ltd
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TOKYO TOKEI SEIZO KAISHA Ltd
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    • G—PHYSICS
    • G04—HOROLOGY
    • G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
    • G04C21/00—Producing acoustic time signals by electrical means
    • G04C21/16—Producing acoustic time signals by electrical means producing the signals at adjustable fixed times
    • G04C21/36—Signal repeating devices

Definitions

  • a control signal generator circuit for an annunciator 1 such as an electric tone in the form of a buzzer or hell consisting of three principle circuits: a timer circuit; a
  • the present invention relates to a control signal circuit which may be conveniently employed as a ringing tone generator in an alarm clock.
  • the prior art tone generator generates a ringing tone continuously from the beginning of its ringing operation to the end of its ringing cycle.
  • two-step type tone generators have been used which are adapted to generate, for a predetermined period of time from the time of initial ringing, a low frequency ringing tone, a low level ringing tone or an intermittent ringing tone and thereafter to generate a continuous ringing tone.
  • I-Ieretofore most of these two-step type ringing tone generators have been operated through the provision of mechanical means. Consequently, they have the disadvantages of being complex in structure, difficult in manufacture, and quite apt to become faulty after very little use.
  • the principle object of the present invention is the provision of an electric tone generator driving circuit, which is adapted to operate an electric tone generator (for instance, a buzzer or an electric bell) intermittently for a predetermined initial period of time and then continuously for a subsequent period of time to provide a two-step type of electric tone signal generator.
  • an electric tone generator for instance, a buzzer or an electric bell
  • This also provides an alarm ringing tone generator for an electric alarm clock having an electric two-step system.
  • Another provision of the present invention is a twostep type control signal circuit characterized by an electric power supply circuit including an electric power source and a power source switch, a timer circuit including a charging circuit comprising a transistor having its base connected with a capacitor in the charging circuit, an astatic multivibrator, and an amplifier circuit for amplifying the output signal from the astatic multivibrator and applying it to an electric tone generator which forms the load in the amplifier circuit.
  • the timer circuit, the astatic multivibrator and the amplifier circuit are connected in parallel to the electric power supply circuit.
  • a load resistor provided in the timer circuit is also the biasing resistance of the astatic multivibrator.
  • the oscillatory pulses of the astatic multivibrator are amplified by the amplifier circuit and then applied to the electric tone generator forming the load in the circuit. Consequently, the electric tone generator is operated intermittently to generate an intennittent tone.
  • the transistor in the charging circuit is turned on so that a current flows through the load resistor. Since this load resistor is in common with the biasing resistor of the astatic multivibrator, the oscillatory action of the astatic multivibrator ceases; consequently, a current flows directly through the load of the amplifier to generate a continuous tone.
  • tone signal generation is enabled to operate in a two-step manner, first intermittently and then continuously. It is also possible to generate the intermittent tone for a desired time interval and to regulate the period of generation of the intermittent tone by adjusting the time constants of the astatic multivibrator and the charging circuit, respectively.
  • FIG. 1 is a circuit diagram of the tone signal generator circuit comprising this invention.
  • FIG. 2 is a graphic illustration of the current waveform flowing through load 2 in the amplifier circuit of Fig. 1.
  • a dotted line 1 represents the timer circuit utilizing a charging circuit.
  • the dotted-line block 2 represents the astatic multivibrator, and the dotted-line block 3 represents the amplifier circuit containing an electric tone generator Z such as a bell or a buzzer which forms the load for the circuit.
  • the switch means S is connected in series with the power supply E which is a d.c. source provided in any convenient manner well known in the prior art.
  • the charging capacitor C l is connected in series with the charging resistor R1 both of which are connected across the power supply E by means of supply lines 4 and 5.
  • An NPN or PNP transistor TRl is used in the charging circuit and is operative when the charging capacitor has reached a predetermined voltage level.
  • the astatic multivibrator 2 comprises the gating resistor R2 connected on one side to line 4 and on the other side to the emitters of both transistors TR2 and TR3.
  • the transistors TR2 and TR3 may be of the PNP or NPN type to perform the oscillating function.
  • the resistors R3 and R4 are the load resistors of the astatic multivibrator 2.
  • the R-C circuits represented as C2 and R6 connected to the base of transistor TR3, and C3 and R7 connected to the base of transistor TR2 are the A-C time constant settings for the multivibrator circuit.
  • TR4 which may be a PNP or NPN transistor device, has its base connected to the collector of transistor TR3, while its emitter is connected through the biasing resistor R5 to one side of the power supply B through line 4 as in the case of bias ing resistor R2 and charging resistor R1.
  • the collector of transistor TR4 is connected to the load Z of the amplifier circuit 3 which is an electric tone generator such as a bell or buzzer in an alarm clock or other such timepiece.
  • the timer circuit 1 and the astatic multivibrator 2 are connected in common by line 6 through the gating resistor R2, while the multivibrator circuit 2 and the amplifier circuit 3 containing the electric tone generator Z are directly connected through line 7.
  • Each of these circuits 1, 2 and 3 are connected in parallel to the power supply by means of supply lines 4 and 5.
  • the gating resistor R2 serves both as a load resistor for the charging transistor TRl in the timer circuit 1 and as a series resistor in the emitter circuits of the transistors TR2 and TR3 in the astatic multivibrator circuit 2, and is connected commonly to each of these circuits to achieve a gating effect.
  • the multivibrator 2 is connected to the power supply E through the gating resistor R2 so that a square waveform voltage is generated across the resistor R4 depending upon the time constant determined by the capacitors C2 and C3, and the resistors R6 and R7.
  • This square waveform voltage is amplified by transistor TR4 in the amplifier circuit 3, and, thus, an intermittent waveform of current flows through its output side, that is, through the tone generator Z.
  • the period of this intermittent waveform can be selectively determined by appropriately selecting the capacitors C2 and C3 and the resistors R6 and R7 to choose the time constant.
  • gating resistor R2 serves also as a series resistor for the astatic multivibrator circuit 2, a biasing voltage is applied to the emitters of transistors TR2 and TR3 of the astatic multivibrator 2, and therefore, multivibrator 2 stops its oscillatory action.
  • the load resistor R4 of the oscillator circuit serves as a biasing resistor for transistor TR4 in the amplifier circuit 3, so that the base potential applied at the transistor TR4 is lowered, resulting in a continuous current through the tone generator Z to provide for its constant operation.
  • the period Tl which is the intermittent sounding tone, is determined by the time constant of the capacitors C2 and C3 and the resistors R6 and R7 in the astatic multivibrator 2.
  • the selectable period T2 of the intermittent sounding tone which ends at the starting point of the continuous sounding tone is determined by the R-C time constant of the capacitor Cl and the resistor R1 in the timing circuit 1.
  • the period T3 is the time when the continuous sounding tone is being generated, that is, a constant current I across the load Z, and continues until the switch means S is opened.
  • a two-step type alarm tone generator is provided by means of a simple electric circuit, simplifying the structure of an alarm clock or other such timepiece. Accordingly, this makes it possible to provide for an alarm clock with a two-step electric type alarm tone generator which is simple to manufacture and virtually incapable of wearing out when comparing such alarm devices to those of the mechanical type.
  • a control signal circuit for controlling the current flow through an annunciator to cause intermittent operation followed by continuous operation of said annunciator comprising a timer circuit having a charging capacitor and resistor connected in series and a transistor having its base connected between said charging capacitor and resistor, a multivibrator having its input connected to said timer circuit, an amplifier circuit having said annunciator as a load, said timer circuit, said multivibrator and said amplifier circuit being connected in parallel and across a power supply, the output of said multivibrator circuit being coupled to the input of said amplifier circuit so that said annunciator may be intermittently activated by the repetitive output frequency signal of said multivibrator, said timer circuit including a gating resistor as a load thereof which is connected to said multivibrator for biasing and to cease the operation of said multivibrator when said charging capacitor is charged to a predetermined potential value causing said annunciator to be continuously activated.
  • a control signal circuit for operating a mechanical annunciator first by providing an intermittent signal to said annunciator for its operation followed by a continuous operation comprising a timer circuit, a multivibrator, and an amplifier circuit all connected in parallel and across a power supply,
  • said amplifier circuit comprising an annunciator connected in series with an amplifier transistor, the base of which is connected across said power supply through biasing resistors ll.
  • said multivibrator comprising two transistors with companion RC networks and accompanying load resistors, the output of said multivibrator connected to the base of said amplifier transistor between said biasing resistors ll].
  • said timer circuit comprising a charging capacitor and charging resistor connected across said power supply with a timer transistor connected across said power supply in series with a gating resistor, said timer transistor and gating resistor also connected to the emitters of said multivibrator transistors, the base of said timer transistor connected between said charging capacitor and said charging resistor and 6 IV.
  • switch means connected in series with said power annunciator when said charging capacitor has supply to place said circuit in operative condition reached a predetermined potential causing concausing duction of said timer transistor and a voltage a.
  • said multivibrator to produce an intermittent P acfoss gatmg to signal on said annunciator to cause intermittent 5 cease the y action of Sam mumvlbl'a' operation of the latter; and b thereafter causing continuous operation of said

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Emergency Alarm Devices (AREA)
  • Electromechanical Clocks (AREA)
US94825A 1970-06-10 1970-12-03 Tone control signal circuit having tone pulses followed by continuous tone Expired - Lifetime US3697982A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP45049514A JPS5032038B1 (de) 1970-06-10 1970-06-10

Publications (1)

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US3697982A true US3697982A (en) 1972-10-10

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Application Number Title Priority Date Filing Date
US94825A Expired - Lifetime US3697982A (en) 1970-06-10 1970-12-03 Tone control signal circuit having tone pulses followed by continuous tone

Country Status (5)

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US (1) US3697982A (de)
JP (1) JPS5032038B1 (de)
CH (1) CH514898A (de)
DE (1) DE2038111B2 (de)
FR (1) FR2061164A5 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3763326A (en) * 1972-05-22 1973-10-02 Bell Canada Northern Electric Telephone audio signalling arrangement
US3875559A (en) * 1971-10-18 1975-04-01 Rexroth & Szekkessy Circuit system for brake lights
US3906479A (en) * 1974-03-15 1975-09-16 E Systems Inc Time interval computer
US3912952A (en) * 1971-12-27 1975-10-14 Sumitomo Electric Industries Piezoelectric acoustic multiple tone generator
US4234876A (en) * 1976-10-19 1980-11-18 Riken-Denshi Kogyo Kabushiki Kaisha Omnidirectional move-stop sensor
US4659042A (en) * 1984-06-19 1987-04-21 Friddle Ii William B Canopy locator

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3284796A (en) * 1961-10-30 1966-11-08 Vincent S Borsattino Sound producer
US3504364A (en) * 1966-11-07 1970-03-31 William E Abel Electronic siren

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3284796A (en) * 1961-10-30 1966-11-08 Vincent S Borsattino Sound producer
US3504364A (en) * 1966-11-07 1970-03-31 William E Abel Electronic siren

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3875559A (en) * 1971-10-18 1975-04-01 Rexroth & Szekkessy Circuit system for brake lights
US3912952A (en) * 1971-12-27 1975-10-14 Sumitomo Electric Industries Piezoelectric acoustic multiple tone generator
US3763326A (en) * 1972-05-22 1973-10-02 Bell Canada Northern Electric Telephone audio signalling arrangement
US3906479A (en) * 1974-03-15 1975-09-16 E Systems Inc Time interval computer
US4234876A (en) * 1976-10-19 1980-11-18 Riken-Denshi Kogyo Kabushiki Kaisha Omnidirectional move-stop sensor
US4659042A (en) * 1984-06-19 1987-04-21 Friddle Ii William B Canopy locator

Also Published As

Publication number Publication date
CH514898A (de) 1971-10-31
JPS5032038B1 (de) 1975-10-16
FR2061164A5 (de) 1971-06-18
DE2038111B2 (de) 1972-05-04
DE2038111A1 (de) 1971-12-23

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