CN1055359C - Retaining function circuit for telephone - Google Patents
Retaining function circuit for telephone Download PDFInfo
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- CN1055359C CN1055359C CN95105563A CN95105563A CN1055359C CN 1055359 C CN1055359 C CN 1055359C CN 95105563 A CN95105563 A CN 95105563A CN 95105563 A CN95105563 A CN 95105563A CN 1055359 C CN1055359 C CN 1055359C
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Abstract
The present invention relates to a function retaining circuit for a telephone, which comprises three states of input circuits, a high-level supply circuit, a function retaining input circuit and a scanning circuit, wherein the input circuits are respectively used for a retaining press key, parallel operation relief and input without reservation functions during a suspended state, the high-level supply circuit is used for providing a high impedance level identical to a parallel operation relieving level, the function retaining input circuit is used for causing a retaining functional state of the retaining press key to be changed by a retaining input foot, the scanning circuit is used for alternately providing a high impedance high level or a low level scanning retaining input foot, level states of the high impedance high level and the low level scanning retaining input foot are respectively recorded, and the retaining input function is judged to be efficient or not.
Description
The invention relates to a kind of retaining function circuit for telephone.
At present, the reservation function of regular phone machine be used for when the listener busy away from keyboard, or when receiving not one's own phone, can press the reservation key on the telephone set, telephone set is added load, so that phone is unlikely interruption, can hangs up microphone then and leave or utilize interior lines that phone is forwarded on other extension sets.Then, picking up former microphone again, or after picking up extension set, reservation function can be removed automatically, with manipulating of Convenient telephone set.Telephone set on the market has this reservation function mostly, and most dialer integrated circuit (IC) system also has the specification of reservation function.But the less reservation function that utilizes on the dialer integrated circuit of general telephone set manufacturer, its chief reason are that it is impracticable and unstable.
The control clock pulse of general dialer is to adopt non-overlapping (Non-Overlapped) clock pulse, and typical clock pulse generating circuit then is presented among Fig. 2 as for the sequential relationship that is produced as shown in Figure 1.All emphasize low-power consumption because of general dialer again, so can will be used to produce the oscillating circuit of CLKIN (clock input) signal in waiting for (standby) state turns off, simultaneously in order to make the unlikely entanglement of control clock pulse that is produced when the next starting of oscillation, clock pulse generating circuit is in Reset Status with need.Wherein, signal OSCOFF (oscillator is turned off) promptly is when oscillator is switched off, and is used to the control signal of coherent signal of resetting.
In addition, because the pin number of the packing cost of integrated circuit and integrated circuit itself is closely bound up, that is the pin number the more, and then Bao Zhuan cost is also just high.Therefore certain methods just being arranged in prior art is the pin number that is used to reduce integrated circuit.Seeing also Fig. 3, is example with the integrated circuit UM91214A/15A of Lianhua Electronics Co., Ltd, and wherein, MODE IN (pattern input) is a ternary input pin, and promptly MODE IN pin can be connected to high-voltage power supply V
DDOr ground wire V
SsOr unsettled (floating).It is implemented circuit and is shown among Fig. 4, please cooperate and consult scanning sequence shown in Figure 5, at first when MODE IN pin is unsettled, then when S34 is logical zero, MODE IN is coupled with high level, and when S2 is logical one, the level state of MODE IN pin is deposited in the latch 10, and when S34 is logical one, MODE IN pin is coupled with low level, and when S4 is logical one, the level state of MODEIN pin is deposited in another latch 20, the output signal that so can find latch 10 and 20 is respectively that SQ1 equals logical one and SQ2 equals logical zero.Similarly, if MODE IN pin is connected to power supply V
DDThe time, SQ1 and SQ2 all can equal logical one (promptly exporting high level).If MODE IN pin is connected to ground wire V
SsThe time, SQ1 and SQ2 all can equal logical zero.Hence one can see that via the scanning circuit of Fig. 4, can judge the level state of the three-state input of MODE IN.Though aforesaid ternary input circuit can be used for increasing the additional function of input, as reservation function etc., also can reduce production costs, but because its scan input end mouth constantly, just can detect the state of input port, therefore on the dialer of paying attention to power saving, it is used and still is subjected to suitable restriction.
In general typical dialer, its retaining function circuit as shown in Figure 6.Wherein, transistor 30 and switch 40 are the applications circuit of retaining function circuit, and switch 40 is to be arranged to be used on the telephone ' s faceplate as keeping button, and the input port that indicates HK (microphone signal) among the figure is the state that is used to import the microphone position switch.When hanging on, HK is a logical zero, and when hanging up microphone, HK is a logical one, because the HK signal is reverse after the delay of some time by delay circuit 50 and reverser 51, does nondisjunction (NOR) logical operation with the HK signal again.Therefore when hanging on, a pulse signal will appear in the output signal HR of NOR gate 52.This pulse signal is used to remove reservation function, so when a pulse signal inputed to trigger 53, reservation function output HOLDOUT (keeping output) was a logical zero, by keeping key 40 the reservation function state is changed once each time then.In addition, when picking up extension set, because the variation of voltage on the telephone wire also can produce a low level pulse to remove reservation function at transistorized emitter.But this mode has several shortcomings; At first, the variation of voltage can be used for removing reservation function on the telephone wire, but also may phone be become reserved state by original non-reserved state by mistake.Secondly, because the spring noise (bouncing noise) that button produced is different with the noise characteristic that telephone wire is produced, therefore only often can't satisfy removal, therefore cause the reservation function instability aforementioned two kinds of noises at reservation function input HOLDIN (keeping input) the noise electric capacity of adding up simply.
At present, the telecommunication standard that various countries formulate also is not quite similar, and generally speaking, the change in voltage noise on the telephone wire fixes on below 200ms～300ms more.But during because of quick button, may only need the time of 30ms, finish so keep to remove preferably to divide on button and the telephone wire by two different input ports by a key.Can cause integrated circuit pin number to increase because of input port becomes so again, relatively packing cost also can improve more.Therefore consider that cost, most dialer integrated circuit still adopt an input port to be used as and keep input.Simultaneously, telephone set manufacturer does not adopt the reservation function on the dialer integrated circuit mostly yet for to the consideration of practicality with stability.
In view of this, for the effect and the practicality of promoting dialer integrated circuit in the telephone set, purpose of the present invention promptly is to propose a kind of retaining function circuit for telephone, and it can provide stable phone reservation function on the dialer integrated circuit.
Another object of the present invention is to utilize less input pin number making phone number retaining function circuit on the dialer integrated circuit, to save the packing cost of dialer integrated circuit.
The present invention is a kind of retaining function circuit for telephone, comprising:
A ternary input circuit is respectively applied for as keeping button, parallel operation releasing, the input of function without reserve when reaching vacant state;
A high level supply circuit, be used for before the reservation function Pending The Entry Into Force, after the machine microphone that picks up the telephone, provide a high impedance level that is same as the parallel operation relieving circuit, make the parallel operation ring off signal only after reservation function comes into force, could remove reservation function via keeping input pin;
A reservation function input circuit is used for after reservation function comes into force, and makes to keep under the button situation that whether microphone hangs up no matter, all can change the state of reservation function via described reservation input pin; And
A scanning circuit, be used for when reservation function comes into force, the high level or the low level of high impedance alternately are provided, to scan described reservation input pin, and store its potential state respectively by two storing apparatus, whether come into force to differentiate the reservation input function, and when reservation function came into force, the high level that then described high level supply circuit is the stop supplies high impedance was given described reservation input pin.
Basically, retaining function circuit of the present invention, its input pin is ternary input control, before the reservation function Pending The Entry Into Force, whether its input television telephone set microphone is picked up and is decided, if do not picked up, then do not provide any level to its input pin place, the signal of input pin can not produce the action of any triggering to integrated circuit simultaneously, that is keeping button and parallel operation ring off signal is invalid under this state.After microphone is picked up, integrated circuit adds to input pin with the high level of a high impedance, at this moment, the parallel operation ring off signal can be to input pin generation effect, and the noise of telephone wire also can not influence the state of input pin, can move but keep button, so, when withing a hook at the end the button input, bouncing noise after the time through some going, reservation function just can come into force.In a single day reservation function comes into force, just can begin constantly alternately to add to the high level or the low level of the high impedance of input pin, this moment, reservation function button and parallel operation removing function all can move, but its denoising time is then also inconsistent, for example, noise time of generally going to bounce is about 20ms, and the time of going parallel operation to remove noise then is about 290ms.
From the above, hang on or the telephone line on after, can enter reserved state, and in reserved state, no matter whether microphone hangs up, all can be removed by keeping button or parallel operation ring off signal, use to make things convenient for the user.And, can make the unlikely misoperation of telephone set reservation function, so that it is more stable because the denoising processing of button input and parallel operation releasing is separately carried out.
In order more to clearly reveal structure of the present invention, feature and method, it is as follows that this paper conjunction with figs. describes preferred embodiment in detail.
Brief Description Of Drawings:
Fig. 1 is the circuit diagram of the clock pulse generating circuit in the general dialer;
Fig. 2 is the sequential chart of the clock pulse signal that clock pulse generating circuit produced of Fig. 1;
Fig. 3 is the schematic diagram of a dialer integrated circuit;
Fig. 4 is the circuit diagram of the MODE IN pin state of an integrated circuit that is used for scintigram 3;
Fig. 5 is when MODE IN pin is unsettled, utilizes the circuit of Fig. 4 to scan the resulting oscillogram in back;
Fig. 6 is the circuit diagram of retaining function circuit in the typical dialer;
Fig. 7 is the circuit diagram of the input control circuit of retaining function circuit for telephone of the present invention;
Fig. 8 is the circuit diagram of retaining function circuit of the present invention.
Please consult Fig. 7 and Fig. 8 simultaneously, retaining function circuit for telephone wherein of the present invention comprises: ternary input circuit 100, high level supply circuit 110, reservation function input circuit 120, scanning circuit 130, and denoising circuit 140.This denoising circuit 140 comprises reservation button denoising circuit 150 and parallel operation releasing denoising circuit 160, by keep as can be known among Fig. 8 button denoising circuit 150 and parallel operation remove denoising circuit 160 shared preceding half section three triggers 171 to 173, these triggers are connected in series.
Working method as for retaining function circuit of the present invention is as described below:
At first, before the reservation function Pending The Entry Into Force, signal HOLD (reservation) and output pin HOLDOUT are logical zero (being low level), then when hook state (HK=1), the input pin HDIN of integrated circuit (keeping input) remains the state of unsettled (floating), does not add any level.And be output as logical one (being high level) with door 200, and or door 210 output remain logical one, no matter so then the HDIN pin is high level or low level, make with the CMOS technology or door 210 can not consume any direct current.This moment, the oscillating circuit of integrated circuit also was a closing state, and therefore whole integrated circuit can be in extremely low power consumption state.When microphone is picked up, the HK signal becomes logical zero by logical one, then via delay circuit 220 and NOR gate 221, signal HKRES (HK replacement) will have the positive pulse signal of a bit of time, this positive pulse signal can be used for the reservation function of resetting, also reset simultaneously all triggers in the denoising circuit 140 are so that make zero the counting of time really.Be logical zero because of HOLD signal and HKIN (HK input) signal this moment, therefore output in the high level supply circuit 110 or door 115 also is logical zero, cause PMOS transistor 116 to be connected, and the high level of supply input pin high impedance, and owing to be output as logical zero with door 200, so signal SGNIN (signal input) has identical signal logic with input pin HDIN, just the level of signal SGNIN and input pin HDIN is logical one, after anti-phase, also be logical one because of the HOLD signal so again, so signal DBRES (data/address bus replacement) is a logical one, this just represents that denoising circuit 140 is still and is in Reset Status.That is after microphone is picked up, only press the reservation button, just can change state, for example, when the reservation button is pressed, the incoming level of input pin HDIN and signal SGNIN are logical zero, and two outputs of latching element 131 and 132 among Fig. 7 are logical zero after through a clock cycle, then signal DBRES equals logical zero, if control clock pulse S1 to S4 one-period is 2.3ms, then signal HDCLK (reservation clock) is stablizing the negative pulse appearance that will have a 2.3ms about button 20.7ms, when this negative pulse when reverting to positive level, will make the level of signal HOLD and output pin HOLDOUT be logical one, that is reservation function comes into force, in case and reservation function comes into force, then PMOS transistor 133 and nmos pass transistor 134 will be respectively by clock pulse signal S34 control alternate conduction, just alternately give the high level or the low level of input pin HDIN high impedance, and when clock pulse signal S2 and S4 are logical one, in the level state input and latch element 131 and 132 with input pin HDIN.And because or door 115 be output as logical one, so PMOS transistor 116 can't conducting and disturb the scanning motion of input pin HDIN.When in a single day the reservation button that is pressed is bled off, then the level of input pin HDIN just can be along with the alternate conduction of PMOS transistor 133 and nmos pass transistor 134 height sweep, two output of latching element 131 and 132 then respectively one be low level for high level, one.Therefore the output of XOR gate 135 is logical one, so denoising circuit 140 will be in Reset Status, this moment, input of reservation button or the parallel operation ring off signal of input pin HDIN all can make the output of XOR gate 135 become logical zero, promptly removed reserved state.
For example, if keep the button input, then negative pulse will appear one time in signal HDCLK again behind 20.7ms, make the state of signal HOLD change, and remove reserved state.In addition, if the parallel operation ring off signal is fed through among the input pin HDIN, then behind 296.7ms, an of short duration positive pulse signal will appear in signal HDRES (keep and reset), and to remove reserved state, making signal HOLD is logical zero.
In addition,, in the present invention, there are two signals to can be used for making pierce circuit work, promptly when signal SGNIN is logical zero or signal HOLD is when being logical one, all make oscillator work because the electricity-saving function of dialer is very important.At other times, if dialer does not have other work to carry out, then can turn off oscillator, to reduce power consumption.
Though the present invention discloses as above with a preferred embodiment; but it is not to be used to limit the present invention; any those skilled in the art; without departing from the spirit and scope of the present invention; a little change and retouching of Ying Kezuo, so protection scope of the present invention should be as the criterion with accompanying Claim institute restricted portion.
Claims (6)
1 one kinds of retaining function circuit for telephone comprise:
A ternary input circuit is respectively applied for as keeping button, parallel operation releasing, the input of function without reserve when reaching vacant state;
A high level supply circuit, be used for before the reservation function Pending The Entry Into Force, after the machine microphone that picks up the telephone, provide a high impedance level that is same as the parallel operation relieving circuit, make the parallel operation ring off signal only after reservation function comes into force, could remove reservation function via keeping input pin;
A reservation function input circuit is used for after reservation function comes into force, and makes to keep under the button situation that whether microphone hangs up no matter, all can change the state of reservation function via described reservation input pin; And
A scanning circuit, be used for when reservation function comes into force, the high level or the low level of high impedance alternately are provided, to scan described reservation input pin, and store its potential state respectively by two storing apparatus, whether come into force to differentiate the reservation input function, and when reservation function came into force, the high level that then described high level supply circuit is the stop supplies high impedance was given described reservation input pin.
2. retaining function circuit for telephone as claimed in claim 1 also comprises: one keeps button denoising circuit and a parallel operation releasing denoising circuit, is used for removing respectively reservation and removes noise by strong button input spring noise and parallel operation.
3. retaining function circuit for telephone as claimed in claim 2, the denoising asynchronism(-nization) that it is characterized in that described reservation button is in the denoising time that parallel operation is removed.
4. retaining function circuit for telephone as claimed in claim 2 is characterized in that described reservation can shared a plurality of flip-flop elements by strong denoising circuit and described parallel operation releasing denoising circuit.
5. retaining function circuit for telephone as claimed in claim 2 is characterized in that bounce noise circuit and the parallel operation of going of described reservation button removed the denoising circuit and can be reset when hanging on.
6. retaining function circuit for telephone as claimed in claim 1 is characterized in that described two storing apparatus constitute by latching element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95105563A CN1055359C (en) | 1995-05-31 | 1995-05-31 | Retaining function circuit for telephone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95105563A CN1055359C (en) | 1995-05-31 | 1995-05-31 | Retaining function circuit for telephone |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1137205A CN1137205A (en) | 1996-12-04 |
| CN1055359C true CN1055359C (en) | 2000-08-09 |
Family
ID=5075531
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN95105563A Expired - Fee Related CN1055359C (en) | 1995-05-31 | 1995-05-31 | Retaining function circuit for telephone |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1055359C (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2124532U (en) * | 1992-06-17 | 1992-12-09 | 李建军 | Switchover caller for bridging telephone |
| US5185787A (en) * | 1989-06-26 | 1993-02-09 | First Data Resources, Inc. | Multiple party telephone control system with random dialing for polling |
-
1995
- 1995-05-31 CN CN95105563A patent/CN1055359C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5185787A (en) * | 1989-06-26 | 1993-02-09 | First Data Resources, Inc. | Multiple party telephone control system with random dialing for polling |
| CN2124532U (en) * | 1992-06-17 | 1992-12-09 | 李建军 | Switchover caller for bridging telephone |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1137205A (en) | 1996-12-04 |
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