APPARATUS OF CONTROLLING VOLUME OF RECEIVING BELL OF PHONE
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`BACKGROUND
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`FIELD
`[0001] The present invention relates to an apparatus of
`controlling a volume of a receiving bell of a phone, and more
`particularly, to an apparatus of controlling a volume of a
`receiving bell of a phone capable of gradually increasing the
`volume of the receiving bell in proportion to a change in
`ambient illumination or the number of received call signals
`according to a multi-functional user selection module by setting
`the multi-functional user selection module.
`
`DISCUSSION OF THE BACKGROUND
`[0002] A circuit controlling a volume of a receiving bell of
`a phone according to the related art is configured to include a
`CR series circuit C-R detecting receiving signals incoming
`through lines L1 and L2, a tone ringer unit 1 receiving the
`receiving signals detected by the CR series circuit C-R to
`generate a bell driving signal and output the bell driving
`signal at a predetermined cycle, a buzzer BZ converting the bell
`driving signal output from the tone ringer unit into a voice to
`call a receiver, and a variable resistor VR increasing or
`decreasing a volume of the buzzer BZ. Non-explained signs SW and
`BD in FIG. 1 indicate a hook switch and a bridge rectifying unit
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`BACKGROUND
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`FIELD
`[0001] The present invention relates to an apparatus of
`controlling a volume of a receiving bell of a phone, and more
`particularly, to an apparatus of controlling a volume of a
`receiving bell of a phone capable of gradually increasing the
`volume of the receiving bell in proportion to a change in
`ambient illumination or the number of received call signals
`according to a multi-functional user selection module by setting
`the multi-functional user selection module.
`
`DISCUSSION OF THE BACKGROUND
`[0002] A circuit controlling a volume of a receiving bell of
`a phone according to the related art is configured to include a
`CR series circuit C-R detecting receiving signals incoming
`through lines L1 and L2, a tone ringer unit 1 receiving the
`receiving signals detected by the CR series circuit C-R to
`generate a bell driving signal and output the bell driving
`signal at a predetermined cycle, a buzzer BZ converting the bell
`driving signal output from the tone ringer unit into a voice to
`call a receiver, and a variable resistor VR increasing or
`decreasing a volume of the buzzer BZ. Non-explained signs SW and
`BD in FIG. 1 indicate a hook switch and a bridge rectifying unit
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`rectifying alternating current (AC) receiving signals incoming
`through the lines L1 and L2 to direct current (DC) signals,
`respectively.
`[0003] In the circuit controlling a volume of a receiving
`bell of a phone according to the related art configured as
`described above, when receiving signals of opponent sides are
`detected in the lines L1 and L2 through the CR series circuit (C-
`R), the tone ringer unit 1 drives the buzzer BZ at a
`predetermined period. In this configuration, the variable
`resistor VR interposed in series between the tone ringer unit 1
`and the buzzer BZ is installed at an outer side of the phone to
`enable control at the outside as needed by a user, thereby
`making it possible to control a volume of the buzzer BZ.
`[0004] However, the circuit controlling a volume of a
`receiving bell of a phone according to the related art as
`described above manually controls the volume of the receiving
`bell only by the variable resistor so that the receiving bell
`rings at a set predetermined volume. Therefore, when the phone
`is installed at a drawing room, which is a wide living space,
`and the user is far away from the phone, even though the volume
`is set to be the maximum, it is hard to hear the receiving bell.
`In addition, whenever a position of the user is changed, the
`volume should be manually controlled, which is inconvenient in
`view of use, and the old and the weak and children cannot easily
`handle the circuit controlling a volume of a receiving bell of a
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`phone.
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`BRIEF SUMMARY OF THE INVENTION
`[0005] An object of the present invention is to provide an
`apparatus of controlling a volume of a receiving bell of a phone
`capable of manually and automatically controlling the volume of
`the receiving bell by setting a selection mode and capable of
`providing various service functions to a user and efficiently
`informing the user that a call has been received by gradually
`increasing the volume of the receiving bell in proportion to the
`number of received call signals according to a change in ambient
`illumination in an automatic mode.
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`BRIEF DESCRIPTION OF THE DRAWINGS
`[0006] FIG. 1 is a circuit diagram of a circuit controlling a
`volume of a receiving bell according to the related art;
`[0007] FIG. 2 is a circuit diagram of an apparatus of
`controlling a volume of a receiving bell according to an
`exemplary embodiment of the present invention; and
`[0008] FIGS. 3A to 3H are waveform diagrams of each component
`for describing an operation of the apparatus of controlling a
`volume of a receiving bell according to the exemplary embodiment
`of the present invention.
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`DETAILED DESCRIPTION OF THE ILLUSTRATED EMBODIMENTS
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`[0009] Hereinafter, an exemplary embodiment of the present
`invention will be described in detail with reference to the
`accompanying drawings.
`[0010] FIG. 2 is a detailed circuit diagram of an apparatus
`of controlling a volume of a receiving bell according to an
`exemplary embodiment of the present invention. The apparatus of
`controlling a volume of a receiving bell according to an
`exemplary embodiment of the present invention is configured to
`include a CR series circuit C1-R1 detecting receiving signals
`incoming through lines L1 and L2, a tone ringer unit 1 receiving
`the receiving signals detected by the CR series circuit C1-R1 to
`output a tone signal, a buzzer BZ1 converting the tone signal
`output from the tone ringer unit into a voice to call a
`receiver, a photo-coupler PC1 insulating and interfacing the
`receiving signals detected by the CR series circuit C1-R1,
`shaping elements R2 and C2 shaping an output of the photo-
`coupler, inverters I1 and I2 inverting the receiving signals
`insulated and shaped by the photo-coupler and the shaping
`elements of a ripple carry output of a counter 2, an AND gate
`AND pulsing the signal inverted by the inverter I1, the counter 2
`counting outputs of the AND gate AND to output a counting value
`and at the same time, output the ripple carry signal per a
`predetermined counting value, a digital-to-analog converter 3
`converting a digital value into an analog voltage whenever the
`counting value is output from the counter 2, a multiplexer 5
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`performing switching-connection to an automatic or manual
`control setting mode according to selection of a function
`selection switch SW2 in proportion to the analog voltage
`converted by the digital-to-analog converter, a transistor TR
`switching an output of a variable resistor VR or the digital-to-
`analog converter 3 through the multiplexer 5 to drive a photo-
`coupling element PC2, the photo-coupling element PC2 changing an
`output value of the tone ringer unit 1 by the driving of the
`transistor TR, a photo-conductive cell cds2 and a voltage
`dividing resistor R7 changing a magnetic resistance value
`according to day and night incident lights to generate an input
`potential, voltage dividing resistors R8 and R9 generating a
`reference potential of a comparison value as a supply power Vcc,
`a comparator comparing the input potential with the reference
`potential, a D flip-flop 7 receiving a clock in which an output
`a of a monostable oscillator 4 rises from a ground potential to
`a power supply voltage according to a comparison output value of
`the comparator 6 to output Q an input D as it is, the monostable
`oscillator 4 maintained in a high state to enable the counter 2
`when the receiving signals are continuously input and resetting
`the counting output value of the counter 2 when the receiving
`signals are not input, and a resistor R3 and a condenser C3 for
`setting a time constant of the monostable oscillator 4, which
`are connected to each other. Here, non-explained signs SW1, D1,
`and BD indicate a hook switch, a diode for preventing a reverse
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`current, and a bridge rectifying circuit for protecting a
`polarity, respectively.
`[0011] An operation and an effect of the apparatus of
`controlling a volume of a receiving bell according to an
`exemplary embodiment of the present invention configured as
`described above will be described with reference to FIGS. 3A to
`3H.
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`[0012] First, when the function selection switch SW2 is
`connected to a ground side as shown in FIG. 2, the multiplexer 5
`connects the variable resistor VR to a base of the transistor TR
`as in an existing case to manually perform a control to have a
`predetermined volume according to a value set by the variable
`resistor VR. In addition, when the function selection switch SW2
`is connected to the power supply voltage Vcc, the multiplexer 5
`connects an output terminal Vout of the digital-to-analog
`converter 3 to a base resistor R5 of the transistor TR.
`[0013] In addition, in the case in which call signals of a
`transmitting side through the lines L1 and L2 are not present,
`the counter 3 is reset to be in an initialized state. In this
`state, when the receiving signals of the transmitting side as
`shown in FIG. 3A are applied through the lines L1 and L2, they
`are detected by the CR series circuit C1-R1 to thereby be input
`to the tone ringer unit 1 and at the same time, drive a
`photodiode of the photo-coupler PC1. The photodiode is driven,
`such that signals in a pulse form shaped and inverted as shown
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`in FIG. 3B are output through the shaping elements R2 and C2 and
`the inverter I1 connected to an emitter side of the photo-coupler
`PC1. At the same time, when the output signals in the pulse form
`as shown in FIG. 3B are applied to the counter 2 through the AND
`gate AND, the counter 2 counts an initial pulse P1 to output a
`value of 1.ø.ø.ø. through output terminals Q0 to Q3. The
`counting value 1øøø of the initial pulse P1 is converted into an
`analog value corresponding to t1 as shown in FIG. 3G by the
`digital-to-analog converter 3, and the converted analog voltage
`value corresponding to t1 drives the transistor TR through the
`multiplexer 5 and emits light in the photodiode of the photo-
`coupling element PC2 to change a resistance value of the photo-
`conductive cell cds1.
`[0014] Therefore, with the initial call signal P1, the output
`of the counter 2 and the output voltage of the digital-to-analog
`converter 3 are relatively low, such that a current flowing in
`the photodiode of the photo-coupling element PC2 is small and
`large resistance is generated in the photo-conductive cell cds1.
`As a result, since the photo-conductive cell cds1 is connected in
`series between an output terminal of the tone ringer unit 1 and
`the buzzer BZ, a volume of the buzzer BZ is small through the
`photo-conductive cell cds1. However, when the call signals of
`the transmitting side as shown in FIG. 3A are continuously
`applied in a state in which the hook switch SW1 is switched on
`(that is, a state in which a handset is hung up), as the number
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`of call signals is increased, the counting value of the counter
`2 is increased as shown in FIGS. 3C to 3F and an output analog
`voltage of the digital-to-analog converter 3 is also increased
`as shown in FIG. 3G, such that the current flowing in the
`photodiode of the photo-coupling element PC2 is increased and the
`resistance value of the photo-conductive cell cds1 is relatively
`decreased. As a result, a volume of the buzzer BZ is gradually
`increased.
`[0015] Then, in the case in which the number of applied call
`signals is changed from 16 to 17, the output value of the
`counter 2 is changed from a state of 1111 to a state of øøøø,
`such that the volume is decreased from a maximum magnitude to a
`minimum magnitude. Therefore, as shown in FIG. 3A, with respect
`to a seventeenth call signal P17, the counter 2 outputs the
`ripple carry signal in the state of 1111 so that a pulse input
`is not applied to the counter 2. That is, when the ripple carry
`signal output from the counter 2 is inverted by the inverter I2
`and is then fed back to the AND gate AND, the AND gate AND
`performs an AND operation on seventeenth or more call signals to
`maintain the output values Q0 to Q3 of the counter 2 in the state
`of 1111 and at the same time, maintain the volume at a maximum
`magnitude.
`[0016] In addition, when the function selection switch SW2 is
`connected to an output side of the D flip-flop 7, the volume is
`manually or automatically controlled according to ambient
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`illumination of the photo-conductive cell cds2. That is, in the
`daytime in which incident light is large, the resistance value
`of the photo-conductive cell cds2 is decreased, such that the
`input potential by the photo-conductive cell cds2 and the
`resistor R7 becomes lower than the reference potential by the
`voltage dividing resistors R8 and R9. As a result, the
`comparator 6 outputs a 'low' level close to a ground potential.
`Therefore, the D flip-flop 7 receives the output a of the
`monostable oscillator 4 rising from the ground potential to the
`power supply voltage as shown in FIG. 3H as a clock CK at the
`time of applying the call signal to output Q the 'low' level
`output of the comparator falling to the ground voltage at it is.
`Therefore, in this case, the multiplexer 5 connects the variable
`resistor VR to the transistor TR such as connecting its input
`terminal to the ground to fix the volume to a predetermined
`value as set by the variable resistor in the daytime.
`[0017] In addition, at night in which incident light is
`small, an amount of light incident to the photo-conductive cell
`cds2 is small, such that the resistance value of the photo-
`conductive cell cds2 is increased. Therefore, the input
`potential by the photo-conductive cell cds2 and the resistor R7
`becomes higher than the reference potential by the voltage
`dividing resistors R8 and R9, such that the comparator 6 outputs
`a 'high' level close to a straight polarity voltage. Therefore,
`the D flip-flop 7 receives the output a of the monostable
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`oscillator 4 rising from the ground potential to the power
`supply voltage as shown in FIG. 3H as a clock CK at the time of
`applying the call signal as described above to output the 'high'
`level close to the straight polarity voltage, which is the
`output of the comparator 6, as it is through its output terminal
`Q. Therefore, in this case, the multiplexer 5 connects the
`output of the digital-to-analog converter 3 to the base of the
`transistor TR such as connecting its input terminal to the power
`supply voltage to gradually increase the volume from a volume
`having a small magnitude as in the above-mentioned operation
`description.
`[0018] Here, the D flip-flop 7 performs another operation in
`addition to the above-mentioned operation. For example, in the
`case in which the receiver turns on an ambient illuminator in
`order to receive a call during a period in which the volume is
`gradually increased from a small magnitude by the photo-
`conductive cell cds2 at night, the resistance value of the photo-
`conductive cell cds2 is decreased due to the ambient illuminator,
`such that a malfunction that the volume is fixed as in the
`daytime occurs. Therefore, the D flip-flop performs an
`operation remembering a state of the ambient illuminator
`(illumination) when a call signal is first received, in order to
`prevent the malfunction as described above. In addition, when a
`sender abandons the call, such that a call signal is no longer
`applied to a receiving side phone, the monostable oscillator 4
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`outputs the ‘low’ level when a predetermined time elapses by the
`resistor R3 and the condenser C3 for setting a time constant
`after a final call signal to automatically reset the output
`value of the counter 2 counted to be increased up to now in an
`initialized state for the next call.
`[0019] In addition, the switch SW1 connected to a reset
`terminal RESET of the monostable oscillator 4 interworks with
`the hook switch SW1. Therefore, when the receiver picks up the
`handset to state a call, the monostable oscillator 4 is reset to
`reset the counter 2. When the receiver hangs up the handset
`after he/she completes the call, the hook switch SW1 returns to
`an original states, such that the monostable oscillator 4 is
`restored in a ready state so as to receive the call signal as
`described above simultaneously with being released from the
`reset state.
`[0020] As set forth above, according to the exemplary
`embodiment of the present invention, the selection mode is set
`as needed by the user, thereby making it possible to manually or
`automatically control the volume of the receiving bell.
`Particularly, the volume of the receiving bell is gradually
`increased in proportion to the number of received call signals
`according to the change in the ambient illumination in an
`automatic mode, thereby making it possible to provide various
`service functions to the user. In addition, since the volume
`control needs not to be separately controlled, the apparatus of
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`controlling a volume of a receiving bell may be conveniently
`used.
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`WHAT IS CLAIMED IS:
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`1. An apparatus of controlling a volume of a receiving
`bell of a phone, comprising: a CR series circuit C1-R1 detecting
`receiving signals incoming through lines L1 and L2, a tone ringer
`unit 1 receiving the receiving signals detected by the CR series
`circuit C1-R1 to output a tone signal, a buzzer BZ1 converting the
`tone signal output from the tone ringer unit into a voice to
`call a receiver, a variable resistor VR controlling a volume of
`the buzzer BZ1, a photo-coupler PC1 insulating and interfacing
`the receiving signals detected by the CR series circuit C1-R1,
`shaping elements R2 and C2 shaping an output of the photo-
`coupler, inverters I1 and I2 inverting the receiving signals
`insulated and shaped by the photo-coupler and the shaping
`elements of a ripple carry output of a counter 2, an AND gate
`AND pulsing the signal inverted by the inverter I1, the counter
`2 counting outputs of the AND gate AND to output a counting
`value and at the same time, output the ripple carry signal per a
`predetermined counting value, a digital-to-analog converter 3
`converting a digital value into an analog voltage whenever the
`counting value is output from the counter 2, a multiplexer 5
`performing switching-connection to an automatic or manual
`control setting mode according to selection of a function
`selection switch SW2 in proportion to the analog voltage
`converted by the digital-to-analog converter, a transistor TR
`switching an output of the variable resistor VR or the digital-
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`to-analog converter 3 through the multiplexer 5 to drive a
`photo-coupling element PC2, the photo-coupling element PC2
`changing an output value of the tone ringer unit 1 by the
`driving of the transistor TR, a photo-conductive cell cds2 and a
`voltage dividing resistor R7 changing a magnetic resistance value
`according to day and night incident lights to generate an input
`potential, voltage dividing resistors R8 and R9 generating a
`reference potential of a comparison value as a supply power Vcc,
`a comparator comparing the input potential with the reference
`potential, a D flip-flop 7 receiving a clock in which an output
`a of a monostable oscillator 4 rises from a ground potential to
`a power supply voltage according to a comparison output value of
`the comparator 6 to output Q an input D as it is, the monostable
`oscillator 4 maintained in a high state to enable the counter 2
`when the receiving signals are continuously input and resetting
`the counting output value of the counter 2 when the receiving
`signals are not input, and a resistor R3 and a condenser C3 for
`setting a time constant of the monostable oscillator 4, which
`are connected to each other.
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