前苏联专利SU1416065A3 Device for monitoring the presence of call and state of switch of telephone receiver

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专利摘要:
The digital supervisory circuit comprises an amplitude comparator and EXCLUSIVE-OR gate to provide an output signal indicating the difference in time an input signal is above and below a predetermined reference potential. This output signal is integrated in an up-down binary counter and also is coupled to a first logic circuit under control of the counter which provides a ring present supervisory signal when a first threshold is exceeded and a second logic circuit under control of the counter which provides a switch hook detection supervisory signal when a second threshold is exceeded. A hit-timing circuit is provided coupled to the counter and the first and second logic circuits to prevent response of the counter and second logic circuit to line transients.
公开号:SU1416065A3
申请号:SU833584847
申请日:1983-04-25
公开日:1988-08-07
发明作者:Томас Кочран Вильям
申请人:Интернэшнл Стандарт Электрик Компани (Фирма)；
IPC主号:

专利说明:

Riga.1

a: Q O) C71
s
The invention relates to a telephone communication technique and is intended to monitor the state of a telephone switch and the presence of a call signal.
The purpose of the invention is to increase the reliability of the control while simplifying the device.
Fig. 1 shows a structural electrical circuit of the call presence control device and the state of the switch of the telephone set; Fig. 2 shows signal timing diagrams explaining the principle of operation of the device for monitoring call availability and the state of the switch of the telephone set; FIG. 3 shows an example of implementation of a clock logic block; figure 4 is an example implementation of the frequency selector; FIG. 3 shows an example of implementation of a clock signal generator; FIG. 6 shows a device that implements the interference timing logic; Fig. 7 shows an example of the implementation of a detector of a switch state and a dialer pulses. The device for controlling the presence and state of the telephone switch contains amplitude comparator 1, EXCLUSIVE OR 2 element, reversible counter 3, frequency selector 4, clock logic unit 5, clock signal generator 6, clock counter 7, register 8 counters, mixer. 9, summator 10, detector 11 state of a switch and dialer pulses, counter 12, first AND element 13, first trigger 14, second AND element 15, second trigger 16, call signal detector 17, counter 18, first AND element 19, the first divider 2 0 frequency, trigger 21, the second element And 22, the second frequency divider 23.
The device for monitoring the presence of a call and the state of the telephone switch works as follows.
The proposed device uses an amplitude comparator 1 - (Fig. 1), which does not require stability of the amplitude of the reference potentials, since the device detects time intervals, not amplitudes.
The reference voltage for the amplitude comparator (Fig. 2a) is the ground potential (or some selection
5 0 5 0 about 5
0
relatively low potential, which is therefore not subject to change (moreover, the amplitude of the reference potentials is not required), at a signal at point A (fig. 2a), the form of which is shown in fig. 26 and which does not contain a constant component , the resulting signal at point B (FIG. 2a) is as shown in FIG. 2b of curve B, i.e. the time interval T1, when the signal at the input A (Fig. 2a) is higher than the reference potential, is equal to the time interval T2, corresponding to the state when the signal at the input A (Fig.2a) is lower than the reference potential. If a voltage is applied to the input A (Fig. 2a), which has a constant component (Fig. 2c), then at the output B (Fig. 2a) of the amplitude comparator, the signal will look like that shown in Fig. 2c (curve C): the time interval T1, when the signal is higher than the reference voltage, is longer than the time interval T2, when the input signal is lower than the reference voltage. In the ideal case, the difference T1 and T2 in the absence of the amplitude comparator 1 constant at the input A (fig. 2a) is equal to zero (fig.2b). However, if the input at the input A (fig 2a) is constant, the intervals T1 and T2 are different. This difference can be measured digitally and is determined by the presence or absence of a constant component. The dead zone in the comparator is usually used to establish a call. In the absence of a ringing current, the voltage at input A (Fig. 2a) is zero and time intervals T1 and T2 do not exist. In the presence of ringing current at the input A, which exceeds the dead zone, the time intervals T1 and T2 exist and are equal. When an outgoing call is expected, instead of the ground potential, the amplitude comparator 1 (Fig. 1) is subjected to a sinusoidal oscillation. When the lever of the telephone device is pressed (Fig. 2b), i.e. when there is no constant component at input A (Fig. 2a), when releasing the lever of the telephone set Tfg.2c), the difference between the intervals T1 and T2 represents an indication of the condition of the released lever of the telephone set.
Thus, the foregoing illustrates the principle in accordance with which the operation of the control device (Fig. 1) as a whole is carried out.
In the case of a linear circuit, the subscriber is either disconnected or connected to the line. If the subscriber is connected to the line, then the line receives the lowest current, if the subscriber is disconnected from the line, then the direct current is not received. Therefore, when the subscriber picks up the phone for a call, direct current flows to the first input of the amplitude comparator 1 (Fig. 1) and at this moment the sinusoidal voltage enters the amplitude comparator 1 through the mixer 9 and the adder 10, i.e. call being sent waiting. During the call, the subscriber's handset is not lifted and the direct current is not after the presence or absence of a post current at the input of the amplitude comparator 1. The bell does not ring at this time. Therefore, when the subscriber drops the handset, the first input of the amplitude comparator 1 goes from the zero level to the DC level. A sinusoidal oscillation is applied to the other input of the amplitude comparator I to turn on the circuit in order to detect the off lever state; Sinusoidal oscillation is used for
3 reversible counter to detect DC conditions (Fig. 2c).
During recruitment, direct current to the input of the amplitude comparator 1 is supplied -.
stupid, therefore, to the second input 2o between the on and the
25
thirty
the amplitude comparator 1 is applied to the earth potential. The up / down counter 3, depending on the output signal of the EXCLUSIVE USH 2 element, works either in the addition mode (when the output of the EXCLUSIVE OR 2 element is logical O) or in the subtraction mode (when the output of the specified element is logical 1). The counting is performed when the clock frequency arrives from block 5. Thus, if the intervals T1 and T2 are such as shown in Fig. 26, then the reversible counter 3 adds and subtracts the same value, therefore, it can detect call current. If direct current is present (Fig. 2c), then the reversible counter 3 adds longer than it subtracts, the resulting difference shows the on or off state of the lever switch. A call is disconnected when a presence is detected.
I turn off the “left lever switch at short intervals. Therefore, the on and off states of the lever switch quickly change intervals (figs, 26 and b), therefore j can monitor the pulses of the set by determining oscillations between the on and off states of the lever switches. This is done by the counter 12 and the second trigger 16 of the detector 11. The input frequency of block 5 is set by the selector 4. The signals of frequencies 8, 10, 13, 5. 20 and 40 kHz are received at the input of the frequency grid of the selector 4, using frequency synthesizer. Counter 7, clocked by a 1 kHz frequency signal, and register 8 provide for timing of interference, preventing the generation of a call and a red switch to create false responses to line transients (interference timing is triggered at short intervals. At short intervals On and off lever switch quickly intervals (figs, 26 and b), j can follow the dial pulse by determining the oscillation between the on and off states of the lever switch This is accomplished by counter 12 by the second trigger 16 of detector 1. The input frequency of block 5 is set by the lecturer 4. Signs are received at the input of the Grid portion of the selector 4. H is that 8, 10, 13, 5. 20 and 40 kHz, which are obtained using a frequency synthesizer. Counter 7, clock with a 1 kHz frequency signal, and regis 8 ensure that the time is hindered by preventing the creation of spurious actions on transients (interference timeout) when detecting a call and a red switch state.
call and the subscriber picks up the phone. Call
absent when illustrated in fig. 6). This current is absent, which means that the symbol used in this way is that the handset is on the lever switch and there is no call signal on the line (Fig. 2b). The presence of the presence state of the call causes the line circuit to turn on the telephone ringing. The subscriber answers the call and picks up the phone, while the lever switch is turned off, i.e. constant present
The invention proposes that the principle of operation increases the control's sufficiency while simultaneously increasing the device.

权利要求:
Claims (1)
[1]
Formula invented
A device for monitoring the presence in g of the call and the state of the switch of the background apparatus, containing the details of the call signal, the detector, the state of the switch, and the number of pulses, differing
component, which corresponds to figv,
To detect the states of the lever switch is used
five
0
about
five
I turn off the “left lever switch at short intervals. Therefore, the on and off states of the lever switch quickly change intervals (figs, 26 and b), therefore j can monitor the pulses of the set by determining oscillations between the on and off states of the lever switches. This is done by the counter 12 and the second trigger 16 of the detector 11. The input frequency of block 5 is set by the selector 4. The signals of frequencies 8, 10, 13, 5. 20 and 40 kHz are received at the input of the frequency grid of the selector 4, using frequency synthesizer. A counter 7 clocked by a 1 kHz frequency signal and a register 8 provide for timing of interference, preventing the generation of a call and a red switch for detecting the generation of false reactions to line transients (interference timing is illustrated in FIG. 6). Thus used in
the present invention, the principle of operation allows to increase the reliability of-. control while simultaneously growing the device.
Invention Formula
d is illustrated in FIG. 6). Thus used in
A device for monitoring the presence of a call and the state of a telephone switch, containing a call signal detector, a switch state detector and a dialer pulse, characterized by
In order to increase the reliability of the control while simplifying the device, a series connected amplitude comparator is introduced, the first input of which is the input of the call signal, the EXCLUSIVE OR element and the reversible counter, the series connected frequency selector, the first, second and third inputs of are respectively the inputs of the call frequency signal, the Frequency Grid and the clock signal J and the clock logic unit, the second input of which is the input of the call frequency signal and is connected to The first output of the frequency selector, and the third input is the input of a logic signal corresponding to the presence of a call signal, the clock signal generator, the first input of which is connected to the fourth input of the clock logic unit and the first input of the reversing counter, the second input is connected to the first output of the reversing counter, the output is connected to the second input of the reversible counter, the third input of which is connected to the output of the clock logic unit, the fifth input of which is connected to the second output of the reversing counter, successively a connected clock counter and a shift register, the other input of which is a synchronization input of c i m pulses, and the output is sub-. It is connected to the second input of the reversible counter, the mixer connected in series, the first and second inputs of which are the call signal and sinusoidal signal inputs respectively, and the adder, the second input of which is connected to the common bus and the output connected to the second input of the amplitude comparator, the second the input element EXCLUSIVE OR is the digital signal input, corresponding to
5 Q l
five
five
the polarity of the DC signal at the input of the amplitude comparator, the switch state detector and the dialer pulses are made in series of a counter, the first And element, the first trigger, the second And element and the second trigger, the second input of which is connected to the output of the first And element, the second input of the second one is connected to the output of an element of the CLIPPER or OR, the second input of the second element I is connected to the second input of the first trigger and the second input of the reversible counter, the input of the counter En with the third output of the reversible counter, the call signal detector is designed as a series-connected counter, the input of which is connected to the fourth output of the reversible counter, first element I of the first frequency divider and trigger, the second input of which is connected to the output of the second trigger switch of the state of the switch and pulses the dialer, whose output is the first output of the device, and the trigger output of the call signal detector is the second output of the device, connected in series to the second And element, the first input of which is the input of a logical signal corresponding to the presence of a call signal, and connected to the second input of the first And element, and the second frequency divider, the output of which is connected to the second input of the first frequency divider, the third input of the first And signal detector element The call is connected to the second input of the first element. Both the switch state detector and the dialer pulses, the second input of the second element AND the call signal detector are the input of the control signal.
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Editor L.Gratillo
Compiled by N.Mes Shna Tehred M „Hodanich
Order 3892/58
Circulation 660
VNISHI USSR State Committee
for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5
Corrector S.Cherni
Subscription

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引用文献:

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US3772477A|1972-07-17|1973-11-13|Bell Telephone Labor Inc|Telephone dial pulse detection circuit|

GB1479094A|1975-03-25|1977-07-06|Standard Telephones Cables Ltd|Ring trip detectors|

US4087646A|1977-01-28|1978-05-02|Bell Telephone Laboratories, Incorporated|Dual mode telephone subscriber loop current detector|

US4132864A|1977-04-28|1979-01-02|International Business Machines Corporation|Digital measurement of the DC value in an AC signal adapted to telephone off-hook detection|

IT1128374B|1980-02-19|1986-05-28|Cselt Centro Studi Lab Telecom|TELEPHONE CIRCUIT FOR THE GENERATION OF THE RINGTONE RHYTHM AND THE DETECTION OF THE RELEASE|

US4349703A|1980-03-31|1982-09-14|International Telephone And Telegraph Corporation|Programmable ring signal generator|AU579749B2|1982-03-24|1988-12-08|Alcatel Australia Limited|A ring signal detector|

DE3545574A1|1985-12-21|1987-07-02|Philips Patentverwaltung|METHOD AND CIRCUIT ARRANGEMENT FOR EVALUATING THE OUTPUT SIGNALS OF CURRENT FLOW DETECTORS IN TELECOMMUNICATION SYSTEMS|

US4887071A|1988-08-18|1989-12-12|Siemens Transmission Systems, Inc.|Digital activity loss detector|

US5402482A|1991-07-08|1995-03-28|Fujitsu Limited|Ring trip deciding circuit|

JP2639304B2|1993-06-15|1997-08-13|日本電気株式会社|Subscriber circuit|

SE9400186D0|1994-01-21|1994-01-21|Ericsson Telefon Ab L M|Procedure in a telecommunications system|

AT283606T|1994-03-04|2004-12-15|Infineon Technologies Ag|METHOD FOR INTERFERENCE-SAFE DETECTION DETECTION WHEN CALL SIGNAL INPUT IN DIGITAL TELEPHONE SWITCHING DEVICES AND CIRCUIT ARRANGEMENT FOR IMPLEMENTING THE METHOD|

US5694465A|1995-03-16|1997-12-02|Advanced Micro Devices, Inc.|Integrated ringer for short telephone lines|

法律状态:

优先权:

申请号 | 申请日 | 专利标题

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