CN1027025C - Wireless audio calling system working at broadcast frequency range - Google Patents
Wireless audio calling system working at broadcast frequency range Download PDFInfo
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- CN1027025C CN1027025C CN 93100072 CN93100072A CN1027025C CN 1027025 C CN1027025 C CN 1027025C CN 93100072 CN93100072 CN 93100072 CN 93100072 A CN93100072 A CN 93100072A CN 1027025 C CN1027025 C CN 1027025C
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Abstract
The present invention relates to a wireless audio calling system operated at a broadcast frequency range. The system comprises transmitting equipment and a plurality of audio calling receivers, wherein each calling receiver can store and replay the audio calling information. In order to cause an ordinary radio to learn contents of the information, and the system is provided with an encrypting and decrypting circuit. Compared with the existing display type calling system, the system has the advantages of large information transmission amount and low cost.
Description
The present invention relates to a kind of radio paging system, more particularly, what it related to is a kind of wireless audio calling system that works in broadcast band.
The radio paging receiver that present radio paging system uses numeral or character to show mostly.Though this paging receiver has many good qualities, the amount of information of its reception is few, and cost is higher.Therefore, provide a kind of radio paging system that can directly transmit speech just to seem necessary especially.British patent GB2198269A discloses a kind of radio paging system with speech paging function, but its paging receiving terminal is a kind of non-portable receiving element, and do not have the speech playback, so it does not possess the practical value of present portable paging receiver.And it can not be directly used in broadcast band, and this is because in that event, then all people with said transistor radio can arbitrarily hear and the own beep-page message that has nothing to do.
The objective of the invention is to, provide a kind of portable, have wireless audio calling system voice encryption and speech playback, that work in broadcast band and a speech paging receiver thereof.And because this paging receiver works in broadcast band, it transmits and receives with present broadcast system does not have very big difference, so the price of its beep-pager itself will be significantly less than present display type paging receiver.
The wireless audio calling system that works in broadcast band of the present invention, the paging transmission equipment of its system contain a control unit, an address decoding unit, transmitter unit and transmitting antenna; Each of a plurality of speech paging receivers of this system all contains a radio receiving unit that is connected with reception antenna, the address decoding unit that can translate one or more address codes, and audio frequency amplifier that is connected with loud speaker, it is characterized in that, described paging transmission equipment also has an amplification and a ciphering unit that the voice messaging that will transmit is encrypted, and one is used for being that a set form is for the switching circuit that sends from the address code of described geocoding unit with corresponding encrypted speech signal layout from described amplification and ciphering unit; Described each speech paging receiver also has a decrypt circuit, is used for carrying out work according to the enable signal by described address decoder output, and solves and the corresponding speech information that transmits of address code, delivers to described audio frequency amplifier again; A playback circuitry, the speech information after being used to decipher is write memory circuit, and can the speech information of storing in the described memory be read by user's operation, delivers to described audio frequency amplifier again; A warning circuit, it produces an alarm signal, and it is delivered to described audio frequency amplifier in response to the enable signal of described address decoding unit output.
In order more to be expressly understood the present invention, system of the present invention and paging receiver are further described below in conjunction with accompanying drawing.
Fig. 1 is the frame principle figure of paging transmission equipment in the paging system of the present invention.
Fig. 2 is the frame principle figure of a paging receiver in the paging system of the present invention.
Fig. 3 is the employed signal format for a speech information of paging system of the present invention.
Fig. 4 is a kind of frame principle figure of encrypt/decrypt of the present invention.
Fig. 5 is the another kind of frame principle figure of encrypt/decrypt of the present invention.
In the frame principle figure of the paging transmission equipment shown in Fig. 1 10, the voice signal that transmit is sent into by speech input A and is amplified and ciphering unit 11.At that this voice signal is amplified and encryption.Then, the voice signal after encrypting is sent to a switching circuit 14 with the appropriate address that geocoding unit 12 produces.This switching circuit 14 is a fixing transmission form with the address code and the corresponding encrypted speech signal layout that will transmit, and sends through transmitter unit 15 and antenna 16.This transmitter unit 15 can be a common broadcast with frequency modulation or amplitude modulated transmitter, therefore being formed in this and will not describing in detail about it.In addition this transmitting apparatus 10 needs one equally to amplifying and ciphering unit 11 control unit 13 that geocoding unit 12 and switching circuit 14 are controlled.
Shown in Figure 2 be that radio receiving unit 22 receives radio paging signals from antenna 21, and the signal after the demodulation is exported to address decoding unit 23 and decrypting device 24 in the frame principle figure of a paging receiver of system of the present invention.Address decoding unit 23 can contain one or more address decoders, so that translate one or more address codes, these address codes can comprise independent call address sign indicating number, group calls in several address code or groupcall address code.When address decoding unit 23 translates corresponding address, during address that promptly this machine had, just send an enable signal from this address decoding unit 23, decrypting device 24 is started working, so that to being decrypted immediately following the calling speech that after this address code, is transmitted.When finishing this after coded signal has been decrypted, send an enable signal once more by this address decoding unit, this decrypt circuit is closed.Certainly, the qualification during this can realize by the translating of identical address code at this information end, also can utilize as regularly waiting other method to realize.In like manner, the enable signal that the circuit 25 that is used to produce alarm signal also sends in response to address decoding unit 23 goes to point out the user to receive and passes to his paging information and produce alarm signal.Call voice signal after this alarm signal and the deciphering all will be through an audio frequency amplifier 28 by loud speaker 29 playbacks.To the path of audio frequency amplifier 28 K switch 1 is arranged in this decrypting device 24, it is used for selecting whether will emit this paging information immediately when receiving paging signal by the user.In order to make the user hear paging information in due course, rather than be regardless of occasion ground playback immediately.Therefore a read/write circuit 26 is also directly sent in the output of decrypting device 24, and through it this voice signal is write a memory circuit 27 or reads the information that is deposited in by this memory circuit 27.This read/write circuit is except with memory circuit 27 is connected, and audio frequency amplifier 28 directly delivered in the speech of depositing that it also will be read from memory circuit 27, for emitting sound.Reading by a control switch K2 of this read/write circuit controlled.Only need trigger this K switch 2 when the user need read again gets final product.Self-evident, this memory circuit 27 can be made of DRAM, and if a slice can not satisfy the time span of recording, then can be with two DRAM or more.These need are decided by the designing requirement of system.
A kind of form of the complete paging information that the system of the present invention that shows Fig. 3 transmits.Contain the address code S1 of a pre-paging in its stem, be paging voice signal S2 then, and an address code identical with address code S1 arranged at its afterbody.Therefore, it can make address decoding unit 23 send for twice and enable control signal.Here also not excluded address sign indicating number S3 be a public end signal close decrypt circuit with the effect of enable signal because it can play to send equally.
Certainly, method of encrypting is a lot, but what will advise at this is a kind of simple spectrum inversion method.That is to say, be that the spectrum inversion that is distributed in people's words once promptly original front end is transformed low frequency end as its ciphering process of a kind of embodiment of the present invention, and original low frequency end is transformed to front end.Obviously, even a people has received paging signal with broadcast receiver unintentionally, but, therefore also just content wherein can't have been understood because the frequency spectrum of the sound paging signal of passing on a message is inverted.In fact, this encryption method is by primary modulation and get its lower sideband realization, and deciphering also is the same, remakes once same processing, can inverted frequency spectrum be inverted again, and the original spectrum distribution of restoring signal.
Fig. 4 shows the frame principle figure of the encrypt/decrypt that utilizes spectrum inversion.Wherein input signal is sent into a band pass filter 41 from terminal b earlier, and its passband can be 300-3000Hz; A bidirectional clock generator 42 produces square-wave signal, for example its frequency is 3500Hz, this square-wave signal control interlock electronic switch K3a, K3b and interlock electronic switch K4a, K4b switches the signal from band pass filter 41 outputs, and close the homophase and the inverting input of differential amplifier 43 respectively, finish the digital multipliers function with this.Because square wave does not have even-order harmonic, and the triple-frequency harmonics in the present embodiment odd harmonic is 10500Hz, therefore can utilize a low pass filter 44 to take out useful lower sideband signal at an easy rate from output c, and other composition of filtering.Only need during deciphering coded signal is carried out identical processing once more, can the original spectrum position of restoring signal.
Above-mentioned encryption, the analog circuit shown in also available Fig. 5 is achieved.Wherein input signal is imported by b, and through a low pass filter 51, it can be a 3000Hz low pass filter, sinusoidal signal with sine-wave oscillator 52 produces as 3500Hz, multiplies each other in multiplier 54, through a low pass filter 53,, export again from its output c as the 3500Hz low pass filter.This circuit equally both can be used for encrypting, and also can be used for deciphering.
Those of ordinary skills clearly and distinctly know, the present invention can combine with a present broadcast receiver at an easy rate, or to its encrypted circuit, the function of read/write circuit and memory circuit are made some modification, but these can not flee from thought of the present invention.
Claims (5)
1, a kind of wireless audio calling system that works in broadcast band, the paging transmission equipment of this system (10) contains a control unit (13), a geocoding unit (12), a transmitter unit (15) and transmitting antenna (16); Each of a plurality of speech paging receivers of this system all contains an antenna receiving element (22) that is connected with reception antenna (21), the address decoding unit (23) that can translate one or more address codes, and audio frequency amplifier (28) that is connected with loud speaker (29), a playback circuitry (26), be used for the speech information after the deciphering is stored into memory circuit (27), and can canned data in the described memory (27) be read by user's operation, deliver to described audio frequency amplifier (28) again; It is characterized in that:
Described paging transmission equipment (10) also has an amplification and a ciphering unit (11) that the speech information that will transmit is encrypted; One is used for being that a set form is for the switching circuit (14) that sends from the address code of described geocoding unit (12) with the corresponding signal of encrypted voice layout from described amplification and ciphering unit (11);
Described each speech paging receiver (20) also has:
A decrypt circuit (24) is used for carrying out work according to the enable signal by described address decoder (23) output; And solve and the corresponding speech information that transmits of address code, deliver to described single-frequency amplifier (28) again;
A warning circuit (25), it produces an alarm signal, and it is delivered to described audio frequency amplifier (28) in response to the enable signal of described address decoding unit (23) output.
2, system according to claim 1 is characterized in that: described information set form is the front and back at this voice messaging, and an identical appropriate address sign indicating number is all arranged.
3, a kind of wireless audio calling receiver that works in broadcast band, it contains a radio receiving unit that is connected (22) with reception antenna (21), the address decoding unit (23) that can translate one or more address codes, and audio frequency amplifier (28) that is connected with loud speaker (29), a playback circuitry (26), be used for the speech information after the deciphering is written to memory circuit (27), and can the speech information of storage in the described memory (27) be read by user's operation, deliver to described audio frequency amplifier (28) again, it is characterized in that:
A decrypt circuit (24) is used for carrying out work according to the enable signal by described address decoder (23) output, and solves and the corresponding speech information that transmits of address code, delivers to described audio frequency amplifier (28) again;
A warning circuit (25), it produces an alarm signal, and it is delivered to described audio frequency amplifier (28) in response to the enable signal of described decoding unit (23) output.
4, wireless audio calling receiver according to claim 3, it is characterized in that: between described decrypting device (24) and described audio frequency amplifier (28), one first switch (K1) is arranged, so that whether select when receiving described speech information for the user, the information after will deciphering immediately through described audio amplifier circuit (28) by described loud speaker (29) playback.
5, according to claim 3 or 4 described wireless audio calling receivers, it is characterized in that: described seeking on the discharge road (26) second switch (K2) is arranged, be used for reading the speech information of described memory circuit (27) storage for user's operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93100072 CN1027025C (en) | 1993-01-04 | 1993-01-04 | Wireless audio calling system working at broadcast frequency range |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93100072 CN1027025C (en) | 1993-01-04 | 1993-01-04 | Wireless audio calling system working at broadcast frequency range |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1073560A CN1073560A (en) | 1993-06-23 |
| CN1027025C true CN1027025C (en) | 1994-12-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 93100072 Expired - Fee Related CN1027025C (en) | 1993-01-04 | 1993-01-04 | Wireless audio calling system working at broadcast frequency range |
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| CN (1) | CN1027025C (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110308685B (en) * | 2019-07-05 | 2021-04-13 | 国家电网有限公司 | Electric power overhauls job site monitoring machine |
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1993
- 1993-01-04 CN CN 93100072 patent/CN1027025C/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN1073560A (en) | 1993-06-23 |
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