CN2049446U - Multifunction all-digital selective calling set - Google Patents
Multifunction all-digital selective calling set Download PDFInfo
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- CN2049446U CN2049446U CN 88221436 CN88221436U CN2049446U CN 2049446 U CN2049446 U CN 2049446U CN 88221436 CN88221436 CN 88221436 CN 88221436 U CN88221436 U CN 88221436U CN 2049446 U CN2049446 U CN 2049446U
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- circuit
- selective calling
- calling device
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Abstract
The utility model relates to a dispatching and calling device of the special radio telephone network, providing an all-digital device having selective calling, group calling and all calling functions through adopting a dispatched type special radio telephone network with synchronous frequency operation. A transmitting system of the utility model comprises a station number presetting and transmitting circuit and an interface circuit. A receiving system comprises an interface circuit, a receiving circuit and an indicating circuit. The utility model solves the problem of the selective call of the station and adopts cheap circuits generating 1.5T frame synchronizing signals, and the utility model has the advantages of strong anti-interference ability, simple debugging, stability and reliability, low cost and no adjustable or changeable device, and the utility model can also be used for wireless addressing and the wireless data transfer of the remote-control microcomputer network.
Description
This device relates to scheduling, the calling device of private radio telephone network.
The networking mode of existing scheduling type private radio telephone network is the co-channel work of adopting between main platform (base station) and each minute platform (genus platform), establish that main platform is sent out, each minute the frequency received of platform be f
1, each minute platform send out, frequency that main platform is received is f
2, in the above-mentioned networking mode owing to do not possess the selective call function, when consequently main platform is called out, " getting ready to go into action in hundreds ", and during conversation, cross-talk mutually.
The purpose of this device is for adopting the scheduling type private radio telephone network with work frequently that a kind of device that has selective call, grouies busy and generally call the full digital of function is provided.
This device comprises the call signal transmitting system and the call signal receiving system of radiophone.Transmitting system mainly comprises platform prewired circuit, transtation mission circuit and interface circuit.Transtation mission circuit by dial switch, register, parallel/serial transducer, clock source (CP), timing allocation device, form device or door and code pattern converter synchronously and form.
The platform that dial switch is called out desire number converts corresponding 8421BCD sign indicating number to, and be deposited in the register, clock source produces the timing controlled pulse through the timing allocation device, under the control of the timing controlled pulse that the timing allocation device is exported, make the parallel sign indicating number that is deposited in the register be become serial code, comprise high 4 and low 4 two code characters of platform number.And the sign indicating number row C on warp or the same time shaft of door acquisition.Sign indicating number row C realizes code conversion under the effect of clock pulse CP, nonreturn-to-zero pulse is converted to return-to-zero pulse (split phase code).Clock pulse and timing allocation device are directly controlled and are formed device generation 1.5T frame synchronizing signal and input or door synchronously, are frame synchronizing signal at " beginning " insertion " header " signal e(of split phase code), thus a complete frame signal---signaling sequence obtained.
Interface circuit comprises modulation circuit and match circuit.The sinusoidal carrier of a certain frequency of above-mentioned signaling sequence modulation obtains amplitude shift keying signal ASK, and enters fm radio station and emission through match circuit input microphone cord.
The call signal receiving system mainly comprises interface circuit, call signal receiving circuit and indicating circuit.Interface circuit is made up of demodulator and shaping circuit.The signaling sequence that radio station receives by low put output after, through demodulation, this schmitt trigger shaping, be reduced to original signaling sequence, and deliver to the call signal receiving circuit.
The call signal receiving circuit comprises extraction circuit, the sequence of symhols restore circuit of frame synchronizing signal detecting circuit, clock pulse CP and relatively declares decoding circuit.The frame synchronizing signal detecting circuit through after integration, shaping and the formation, forms the frame-synchronizing impulse signal to the signaling sequence of reduction, so that to the timing allocation device zero clearing of receiving circuit, promptly indicate number series from " now ".The extraction circuit of clock pulse CP comprises edge detection, shaping and pulse shaping circuit, obtains clock pulse CP, declares the sign indicating number moment, recovery code element and code character along separate routes so that provide.The symbol recovery circuit reverts to the number series of 8421BCD sign indicating number in the sign indicating number sequence of reducing after with demodulation under the clock pulse CP effect.This number series under CP control (through distributor), carries out serial/parallel conversion, the separation of platform number sets, and is deposited in the register.In the moment of appointment, together deliver in the digital comparator that presets digital input then, compare by turn, adjudicate.Only when the number that presets number (representing this TV station number) and receive was congruent by turn, comparator was just exported " 1 ".At this moment, be provided with the indicating device work of sound, light indication, expression this TV station is called out; To other situations, comparator output " 0 ", indicating device is not worked, and promptly this TV station should not respond.
This device provides the networking mode of the specific schedule type radiotelephony network with selective call function, has solved the difficult problem of the selective calling in radio station, and can be used for grouping busy and generally calling.This device has been used " being the people " phenomenon common in the actual life, constitutes the logical design thought of selective calling device, utilizes the ready-made integrated package digital comparator to realize this logic function again, and whether this makes response to the signal received in conclusive judgement.Only when the number that presets number (representing the intrinsic number number of this TV station) and receive of digital comparator was congruent by turn, comparator was just exported " 1 ", and this TV station just responds.So system is very stable, reliable.
The selective call calling rate of this device is 100%, for example, when the emission figure disc is allocated to the intrinsic number of receiver, launches 25 times signal, and receiver all receives response.Calling rate is defined as: response times/number of calls (100%).Generally calling calling rate also is 100%, for example when the emission figure disc be allocated to the whole network generally call number the time, launch 25 times signal, receiver all receives response in the net.False alarm rate is 0, and for example the number on the emission figure disc is dialled 25 numbers at random except that receiving numbering and generally calling the number, and receiver does not all respond.False alarm rate is defined as: the number of times (100%) of the number of times/adjacent platform of calling of this TV station response.
This device need not to add any components and parts, only can constitute the optimal circuit (T is that clock pulse is the cycle of code element) that produces the 1.5T frame synchronizing signal with a most cheap NAND gate integrated package.In digital time-division multiplex data transmission system, need frame synchronizing signal, the method that produces frame synchronizing signal has many kinds, wherein has generation, extracts easily the advantage that antijamming capability is strong with wide pulse signal.American I RIG has formulated pulsewidth and has equaled the unified standard of the wide pulse signal of 1.5T as frame synchronizing signal for this reason.The frame synchronizing signal that produces pulsewidth and be 1.5T needs several integrated packages and RC element usually, and the circuit complexity, and cost is higher, if adopt simple and cheap device, unstable properties then influences the timing accuracy of frame synchronizing signal.The 1.5T frame synchronizing signal of this device produces circuit, belongs to best in theory.Circuit the simplest (need not to add any components and parts); Cost the most cheap (only using 3/4 part of a integrated package the most cheap); High accuracy (can reach the precision of the clock cycle that quartz crystal produces); High stability and high reliability.
Usually, adopt diode and RC wave detector, though circuit is simple, detection efficiency is low, and output amplitude is little, can't promote cmos device.This device adopts logic inverter, diode and RC element to form detecting circuit, and its advantage is: high impedance, efficient height, realize the interface function that level promotes with not gate, and can directly promote cmos device.
This device is done clock pulse (CP) source of system with the electronic watch stamen, and is simple, inexpensive, stable, reliable.
This device can all adopt homemade cmos device, has that power consumption is little, antijamming capability is strong, working power voltage wide ranges, digitlization, no adjustable or variable elements device, highly versatile, debugging is easy and characteristics such as inexpensive.Also can be used for wireless addressing and remote control, or be used for the MICROCOMPUTER NETWORK wireless data transmission.
Fig. 1 is the networking mode of specific schedule type radiotelephony network.
Fig. 2 is the radiophone theory diagram of band selective call function.
Fig. 3 is the composition frame chart of ringing signal sending circuit.
Fig. 4 is the logic diagram of call signal receiving circuit.
Fig. 5 is the transtation mission circuit electrical schematic diagram.
Fig. 6 is the receiving circuit electrical schematic diagram.
The embodiment that provides below in conjunction with accompanying drawing is further described this device.
Main platform (base station) 1 and each minute platform F in the networking mode as shown in Figure 1
1, F
2F
NBetween be with frequently (road) work, wherein f
1Main platform is sent out, each minute the frequency received of platform, f
2For each minute platform send out, frequency that main platform is received.
In Fig. 2.Platform prewired circuit 2, ringing signal sending circuit 3, interface circuit 4 are formed the call signal transmitting system of the transmitting terminal of band selective call function radiophone, and 5 is the radio station.Interface circuit 6, call signal receiving circuit 7 and indicating circuit 8 are formed the call signal receiving system of receiving terminal, and 9 is the radio station.
In ringing signal sending circuit, (2 * LMA-) 10 platforms that desire is called out number convert corresponding 8421BCD sign indicating number (0000,0001,0010 to dial switch ... 1001), and be deposited in the register 11.Electronic watch stamen 12 produces clock pulse CP, produces the timing controlled pulse through timing allocation device 13.Under the control of this pulse, the parallel sign indicating number that is stored in the register becomes serial code through parallel/serial conversion 14, and wherein a is the high 4 of platform number; B is low 4 (being equivalent to metric ten and a position respectively).A, b code character be a warp or 15 a sign indicating number row C that obtain on the same time shaft again, and carries out code conversion 16 under the CP effect, and nonreturn-to-zero pulse is converted to return-to-zero pulse d(split phase code).Directly controlling the 1.5T frame synchronizing signal e that forms circuit 17 generations synchronously by CP and timing allocation device is added to or door 18.Like this, be frame synchronizing signal at " beginning " insertion " header " signal e(of sign indicating number row d), thus obtain a complete frame signal f and deliver to interface circuit.Register is IC
1, IC
2, time sequential pulse is by IC
5Output, analog switch IC
3, IC
4Carry out parallel/serial conversion.The serial number is sent into or door IC
78 figure place sign indicating numbers add IC circuit through mould 2
8Carry out code conversion and get 8 due-out coded signals.NAND gate IC
6Making 1.5T frame synchronization generator uses.
Amplifier 5G23 makes oscillator, produces sinusoidal carrier signal.Carrier wave is through analog switch IC
13, by waiting that a frame number coded signal of sending out is modulated, get amplitude shift keying signal ASK, and send into the radio station microphone cord through emitter follower.Carrier frequency can be selected 2KH for use
3About.
IC
9,
10,
11,
12Be used for only sending out the control circuit that 10 frame signals are just stopped paying out automatically.
In the call signal receiving circuit, the signal that receive in the radio station by low put (being horn wire) output after, send into not gate IC '
16Do to amplify and envelope detection, again through this schmitt trigger IC '
17Shaping is reduced to original signaling sequence.This sequence through frame synchronization detect, clock CP extracts and symbol recovery after tell three kinds of information.
At first, this sequence through complementary pair add inverter ic '
16Make pulsewidth and select (integration) 19, phase schmitt trigger IC '
14Shaping 20, monostable trigger IC '
19 Form pulse 20, obtain frame synchronizing signal.This signal promptly indicates number series from " now " to 21 zero clearings of timing allocation device, and Here it is detects frame synchronizing signal.
Secondly, this sequence through mould 2 add IC circuit '
13Make edge detection 22, this schmitt trigger IC '
14Shaping 23, dual timer IC '
15Form clock pulse (CP) 24, this is the extraction of clock CP, and this pulse is on the one hand as the pulse signal of declaring sign indicating number; Deliver on the other hand the timing allocation device (IC '
3) export each shunting sign.
In addition, this sequence warp and door IC '
1With the CP decoding of multiplying each other, make symbol recovery 25, the signaling number series that is recovered is through shaping 26(Si schmitt trigger IC '
14), get the precipitous serial code of waveform.
The serial number is at timing allocation device IC
3Control under, through and door IC '
2Do serial/parallel conversion 27 and obtain parallel sign indicating number, and be deposited at register (IC '
5) in 28, this parallel sign indicating number under the control of timing allocation device, the moment of appointment unified by with door IC '
7Finish and send several 29, go to compare, adjudicate to comparator 30.4-digit number comparator IC '
9, its input B
JCan give arbitrarily put number (0000,0001 ... 1001) 31.As its another input A
J(the four parallel-by-bit numbers of receiving) are with B
J(B when equating by turn
J=A
JThe time), comparator goes out 1, represents that this machine is called out, at this moment bright, the loudspeaker sound of lamp.All the other situations, noiseless, light, this machine does not respond.Wherein, IC '
3,
5,
7,
9,
11Be high 4 (i.e. the tens of 10 o'clock systems); IC '
4,
6,
8,
10,
12, be low 4 (being metric units).
IC '
9,
10Be used to finish the selective call function.Put difference by giving, can call out 00～99 radio station.IC
11,
12Be used to finish and generally call function.This machine gives puts 77 °.Promptly send out at 77 o'clock, 99 radio station all respond in the net.Need by the user, when grouping busy as need, signal is drawn by jack.The number in radio station is made by oneself by the user in code of grouping busy and a group.
Six not gate IC '
16Half make audio signal generator.When this TV station is called out, call signal (IC '
9,
11Go out) control analog switch IC '
20Connect, the loudspeaker that audio signal is delivered in the radiophone machine are sounded.Represent that this machine is called out.Comparator IC '
9,
11Output also receive with the door IC '
1, when this machine was called out, indicator light was bright.
When making wireless microcomputer netting index biography as selective calling device, the data of receiving are by IC '
7,
8Output plughole output, and deliver to processing such as central computer shows, printing.
Claims (7)
1, a kind of digital selective calling device, full digital selective calling device especially for specific schedule type radiotelephony network, comprise call signal transmitting system and call signal receiving system, it is characterized in that: (1) transmitting system is provided with the platform prewired circuit, transtation mission circuit and interface circuit, described transtation mission circuit comprises and will preset the dial switch that platform number converts the 8421BCD sign indicating number to, the binary-coded decimal register, clock source, the timing allocation device of output timing controlled pulse, parallel/serial capable code converter, or door, make nonreturn-to-zero pulse be converted to the code pattern converter and the 1.5T frame synchronization generator of return-to-zero pulse, described interface circuit comprises modulation circuit and match circuit;
(2) receiving system is provided with interface circuit, receiving circuit and indicating circuit, described interface circuit comprises demodulator, shaping circuit, and described receiving circuit comprises frame synchronizing signal detecting circuit, clock pulse extraction circuit, sequence of symhols restore circuit and relatively declares decoding circuit.
2, selective calling device as claimed in claim 1 is characterized in that adopting the electronic watch stamen as clock source.
3, selective calling device as claimed in claim 1 is characterized in that adopting NAND gate directly to produce the frame synchronizing signal that pulsewidth is 1.5T from clock source and timing allocation device.
4, selective calling device as claimed in claim 1 is characterized in that described demodulator adopts logic inverter and diode, RC element to form.
5, selective calling device as claimed in claim 1 is characterized in that the frame synchronizing signal detecting circuit comprises pulsewidth selection (integration) circuit, shaping circuit, monostable trigger pulse shaping circuit.
6, selective calling device as claimed in claim 1 is characterized in that clock pulse extraction circuit adds 2 circuit, shaping circuit and dual timer by the mould of doing to detect usefulness in the edge and forms.
7, selective calling device as claimed in claim 1 is characterized in that the sequence of symhols restore circuit adopts to multiply each other to decode with door and clock pulse CP to make the symbol recovery circuit, adopts the signaling number series shaping of this schmitt trigger to being recovered.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88221436 CN2049446U (en) | 1988-12-18 | 1988-12-18 | Multifunction all-digital selective calling set |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88221436 CN2049446U (en) | 1988-12-18 | 1988-12-18 | Multifunction all-digital selective calling set |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2049446U true CN2049446U (en) | 1989-12-13 |
Family
ID=4853464
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88221436 Withdrawn CN2049446U (en) | 1988-12-18 | 1988-12-18 | Multifunction all-digital selective calling set |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2049446U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106856464A (en) * | 2015-12-09 | 2017-06-16 | 上海和辉光电有限公司 | A kind of sync symbols detecting system |
-
1988
- 1988-12-18 CN CN 88221436 patent/CN2049446U/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106856464A (en) * | 2015-12-09 | 2017-06-16 | 上海和辉光电有限公司 | A kind of sync symbols detecting system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |