CN109596111B - Total station for transmitting telephone - Google Patents
Total station for transmitting telephone Download PDFInfo
- Publication number
- CN109596111B CN109596111B CN201811477136.6A CN201811477136A CN109596111B CN 109596111 B CN109596111 B CN 109596111B CN 201811477136 A CN201811477136 A CN 201811477136A CN 109596111 B CN109596111 B CN 109596111B
- Authority
- CN
- China
- Prior art keywords
- capacitor
- resistor
- transmitting
- triode
- receiving
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C15/00—Surveying instruments or accessories not provided for in groups G01C1/00 - G01C13/00
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/18—Input circuits, e.g. for coupling to an antenna or a transmission line
Abstract
The invention discloses a total station for transmitting a call. The total station for transmitting a call includes: the system comprises a microphone transmitting device, a total station host end, a microphone receiving device and a total station prism end; the transmission transmitting device is arranged on a total station host at the total station host end and is electrically connected with the total station host; the microphone receiving device is arranged in a lens cover of the total station prism at the prism end of the total station; the microphone transmitting device comprises a pickup, a transmitting end audio amplification circuit, a transmitting signal matching circuit and a transmitting antenna; the microphone receiving device comprises a receiving antenna, a receiving signal matching circuit, a receiving end audio amplification circuit and a loudspeaker. The total station for transmitting the call has the advantages of simple structure and strong practicability, can realize short-distance transmission, and avoids power waste in the transmission process.
Description
Technical Field
The invention relates to the technical field of total stations, in particular to a total station for transmitting a call.
Background
At present, an interphone is generally adopted to realize a call function, and because the use of frequency is divided by the national wireless station management committee and corresponding frequency ranges are regulated in different industries, frequency points are required to be applied to the local wireless station management committee when the interphone is used, which is tedious; in addition, in the using process of the interphone, since the outgoing frequency point of the interphone is different from the sub-tone encryption of the interphones of different brand manufacturers, the interphone must be written with the frequency first to realize the mutual communication use, and if the frequency is not right or the frequency is not used for a long time, the frequency needs to be readjusted frequently, so that the interphone is complex to use. The conventional interphone comprises a public interphone and a commercial interphone, the power of the public interphone is smaller than that of the commercial interphone, the power range of the commercial interphone is 4W-5W, the commercial interphone needs application when in use, the public interphone can be used at will, but the power of the public interphone is not less than 0.5W, and when the propagation distance is small, the power is wasted. Therefore, a device with a voice transmission function, which has a simple structure, is convenient for short-distance transmission, and has low power consumption, is urgently needed.
Disclosure of Invention
Therefore, there is a need for a total station for transmitting telephone calls, which has a simple structure and strong practicability, so as to realize short-distance transmission and avoid power waste during transmission.
In order to achieve the purpose, the invention provides the following scheme:
a total station for telephoning, comprising: the system comprises a microphone transmitting device, a total station host end, a microphone receiving device and a total station prism end;
the microphone transmitting device is arranged on a total station host at the total station host end and is electrically connected with the total station host; the microphone receiving device is arranged in a lens cover of a total station prism at the prism end of the total station;
the microphone transmitting device comprises a pickup, a transmitting end audio amplification circuit, a transmitting signal matching circuit and a transmitting antenna; the pickup is used for generating a transmitting audio signal; the transmitting end audio amplifying circuit is respectively connected with the sound pick-up and the transmitting signal matching circuit and is used for amplifying the received transmitting audio signal to obtain a transmitting audio amplifying signal; the transmitting signal matching circuit is connected with the transmitting antenna and used for modulating the received transmitting audio amplification signal to obtain a transmitting end radio frequency signal and performing impedance conversion on the transmitting end radio frequency signal to obtain a transmitting end low-resistance radio frequency signal so as to realize impedance matching with the transmitting antenna; the transmitting antenna is used for transmitting the low-resistance radio-frequency signal of the transmitting end to the microphone receiving device;
the microphone receiving device comprises a receiving antenna, a received signal matching circuit, a receiving end audio amplification circuit and a loudspeaker; the receiving antenna is used for receiving the transmitting end low-resistance radio frequency signal transmitted by the microphone transmitting device; the receiving signal matching circuit is respectively connected with the receiving antenna and the receiving end audio amplification circuit and is used for converting and demodulating the low-resistance radio-frequency signal of the transmitting end to obtain a receiving audio signal; the receiving end audio amplifying circuit is connected with the loudspeaker and used for amplifying and impedance converting the received audio signal to obtain a converted audio signal; the loudspeaker is used for generating sound according to the converted audio signal and transmitting the sound.
Optionally, the transmitting end audio amplifying circuit includes: a triode Q1, a triode Q2, a triode Q3, a resistor R1, a resistor R2, a slide rheostat R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, a capacitor C7, a capacitor C8 and an inductor L1;
the base of the triode Q1 is connected to one ends of the resistor R1, the resistor R2, the capacitor C1 and the capacitor C2, respectively, the other end of the resistor R2 and the other end of the capacitor C2 are both connected to the collector of the triode Q1, the other end of the resistor R1 is connected to one end of the capacitor C3, the other end of the capacitor C3 is connected to the sliding end of the sliding rheostat R3 and one end of the microphone, and the other end of the microphone, the other end of the capacitor C1 and the emitter of the triode Q1 are all connected to the negative electrode of the emitter power supply;
the base electrode of the triode Q2 is respectively connected with the collector electrode of the triode Q1, one end of the resistor R4 and one end of the capacitor C4, the collector of the triode Q2 is connected with one end of the inductor L1, the other end of the inductor L1 is connected with the positive electrode of the transmitting end power supply through a switch, the other end of the inductor L1 is further connected to one end of the resistor R5, the other end of the resistor R5 is connected to the other end of the resistor R4, one end of the resistor R6, and one end of the capacitor C5, the other end of the resistor R6 is respectively connected with one end of the capacitor C6 and one end of the capacitor C7, the other end of the capacitor C6 is connected with one fixed end of the sliding rheostat R3, and the other fixed end of the sliding rheostat R3, the other end of the capacitor C7, the other end of the capacitor C4 and the other end of the capacitor C5 are all connected with the negative electrode of the transmitting end power supply; the collector of the triode Q2 is also connected with the emission signal matching circuit;
the base electrode of the triode Q3 is connected with the emitter electrode of the triode Q2, the collector electrode of the triode Q3 is connected with the collector electrode of the triode Q2, the emitter electrode of the triode Q3 is respectively connected with one end of the resistor R7 and one end of the capacitor C8, and the other end of the resistor R7 and the other end of the capacitor C8 are respectively connected with the negative electrode of the emitter power supply.
Optionally, the transmission signal matching circuit includes: a triode Q4, a resistor R8, a resistor R9, a resistor R10, a capacitor C9, a capacitor C10, a capacitor C11, a capacitor C12, a capacitor C13, a capacitor C14, a resonator S, an emitting end radio frequency transformer and an inductor L4;
a base of the triode Q4 is connected to one end of the resistor R8, the resistor R9 and the capacitor C9, the other end of the capacitor C9 is connected to one end of the resonator S, the other end of the resistor R9 and the other end of the resonator S are connected to a cathode of the emitter power supply, an emitter of the triode Q4 is connected to one end of the resistor R10, the capacitor C10 and the capacitor C11, the other ends of the resistor R10 and the capacitor C10 are connected to a cathode of the emitter power supply, a collector of the triode Q4 is connected to the other end of the capacitor C11 and one end of a secondary coil L3 of the emitter radio frequency transformer, one end of a primary coil L2 of the emitter radio frequency transformer is connected to a cathode of the emitter power supply, and the other end of the primary coil L2 is connected to one end of the capacitor C12, and the other end of the emitter power supply, The transmitting terminal audio amplifying circuit is connected with one end of the inductor L4, the other end of the inductor L4 is connected with the transmitting antenna, the other end of the resistor R8, the other end of the secondary coil L3, one end of the capacitor C13 and one end of the capacitor C14 are connected with the transmitting terminal audio amplifying circuit, and the other ends of the capacitor C12, the capacitor C13 and the capacitor C14 are connected with the negative electrode of the transmitting terminal power supply.
Optionally, the received signal matching circuit includes: the circuit comprises a triode Q5, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a capacitor C15, a capacitor C16, a capacitor C17, a capacitor C18, a capacitor C19, a capacitor C20, a receiving end radio frequency transformer and an inductor L7;
the base electrode of the triode Q5 is respectively connected with one end of the resistor R11, the resistor R12 and the capacitor C15, the other end of the resistor R12 and the other end of the capacitor C15 are both connected with the negative electrode of a receiving end power supply, the emitter electrode of the triode Q5 is respectively connected with one end of the resistor R13, the capacitor C16 and one end of the capacitor C17, the other end of the resistor R13 and the other end of the capacitor C17 are both connected with one end of the resistor R14, one end of the resistor R14 is further connected with the capacitor C18, the other end of the resistor R14 and the other end of the capacitor C18 are both connected with the negative electrode of the receiving end power supply, the collector electrode of the triode Q5 is respectively connected with the other end of the capacitor C16 and one end of the secondary coil L5 of the receiving end rf transformer, one end of the primary coil L6 of the receiving end rf transformer is connected with the negative electrode of the receiving end power supply, the other end of the primary coil L6 is respectively connected with one end of the capacitor C19, the receiving end audio amplification circuit and one end of the inductor L7, the other end of the inductor L7 is connected with the receiving antenna, the other end of the resistor R11, the other end of the secondary coil L5 and one end of the capacitor C20 are all connected with the receiving end audio amplification circuit, and the other ends of the capacitor C19 and the capacitor C20 are all connected with the negative electrode of the receiving end power supply.
Optionally, the receiving-end audio amplifying circuit includes: the circuit comprises a triode Q6, a triode Q7, a triode Q8, a resistor 15, a resistor 16, a slide rheostat R17, a resistor 18, a resistor 19, a resistor 20, a resistor 21, a capacitor C21, a capacitor C22, a capacitor C23, a capacitor C24, a capacitor C25, a capacitor C26, a capacitor C27, a capacitor C28 and an impedance conversion transformer;
the base of the triode Q6 is connected to one end of the resistor 15, the resistor R16, the capacitor C21 and the capacitor C22, respectively, the other end of the resistor R16 and the other end of the capacitor C22 are both connected to the collector of the triode Q6, the other end of the resistor R15 is connected to one end of the capacitor C23, the other end of the capacitor C23 is connected to the sliding end of the sliding rheostat R17, respectively, the other end of the capacitor 21 and the emitter of the triode Q6 are both connected to the negative electrode of the receiving end power supply;
the base of the triode Q7 is connected with the collector of the triode Q6, one end of the resistor R18 and one end of the capacitor C24, the collector of the triode Q7 is connected with one end of the secondary coil L8 of the impedance conversion transformer, the other end of the secondary coil L8 is connected with the anode of the receiving end power supply through a switch, one end of the primary coil L9 of the impedance conversion transformer is connected with the cathode of the receiving end power supply, the other end of the primary coil L9 is connected with one end of the microphone, the other end of the microphone is connected with the cathode of the receiving end power supply, the other end of the secondary coil L8 is also connected with one end of the resistor R19, the other end of the resistor R19 is connected with the other end of the resistor R18, one end of the resistor R20 and one end of the capacitor 25, and the other end of the resistor R20 is connected with one end of the capacitor C26, and the other end of the capacitor C26, One end of the capacitor C27 is connected, the other end of the capacitor C26 is connected with one fixed end of the slide rheostat R17, and the other fixed end of the slide rheostat R17, the other end of the capacitor C27, the other end of the capacitor C24 and the other end of the capacitor C25 are all connected with the negative electrode of the receiving-end power supply;
the base electrode of the triode Q8 is connected with the emitter electrode of the triode Q7, the collector electrode of the triode Q8 is connected with the collector electrode of the triode Q7, the emitter electrode of the triode Q8 is respectively connected with one end of the resistor R21 and one end of the capacitor C28, and the other end of the resistor R21 and the other end of the capacitor C28 are respectively connected with the negative electrode of the receiving end power supply.
Optionally, the resonator S is a quartz crystal resonator.
Optionally, the frequency of the resonator S is 27 MHz.
Optionally, the resistance value of the sliding rheostat R3 ranges from 0 to 10k omega.
Optionally, the resistance value of the sliding rheostat R17 ranges from 0 to 10k omega.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a total station for transmitting a call, which comprises: the system comprises a microphone transmitting device, a total station host end, a microphone receiving device and a total station prism end; the transmission transmitting device is arranged on a total station host at the total station host end and is electrically connected with the total station host; the microphone receiving device is arranged in a lens cover of the total station prism at the prism end of the total station; the microphone transmitting device comprises a pickup, a transmitting end audio amplification circuit, a transmitting signal matching circuit and a transmitting antenna; the microphone receiving device comprises a receiving antenna, a receiving signal matching circuit, a receiving end audio amplification circuit and a loudspeaker. The total station for transmitting the call can be used for school teaching measurement, when the total station is applied in a distance range of 200-300 m, the power is only 0.3W, and the total station can realize short-distance measurement and transmission of students and avoid waste of power. The transmitting device is arranged on the total station host, the circuit structure is simple, and the transmitting end power supply can be directly supplied with power by adopting the power supply on the host; the total station for transmitting the call is simple in structure and strong in practicability, and the call receiving device is arranged in the lens cover of the total station prism, is simple and practical, and can completely meet the requirement of the student on teaching and measurement for talkback.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a total station for transmitting a call according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a microphone transmitting device according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a microphone receiving device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Fig. 1 is a schematic structural diagram of a total station for transmitting a call according to an embodiment of the present invention.
Referring to fig. 1, the total station for transmitting a call of the embodiment includes: the system comprises a microphone transmitting device 1, a total station host end 2, a microphone receiving device 3 and a total station prism end 4; the microphone transmitting device 1 is arranged on a total station host 5 at the total station host end 2 and is electrically connected with the total station host 5; the microphone receiving device 3 is arranged in a lens cover of a total station prism 6 at the total station prism end 4.
The microphone transmitting device 1 comprises a sound pick-up 7, a transmitting end audio amplification circuit 8, a transmitting signal matching circuit 9 and a transmitting antenna 10; the pickup 7 is used for generating a transmitting audio signal; the transmitting end audio amplifying circuit 8 is respectively connected with the sound pickup 7 and the transmitting signal matching circuit 9, and is configured to amplify the received transmitting audio signal to obtain a transmitting audio amplified signal; the transmitting signal matching circuit 9 is connected to the transmitting antenna 10, and is configured to modulate the received transmitting audio amplification signal to obtain a transmitting end radio frequency signal, and perform impedance conversion on the transmitting end radio frequency signal to obtain a transmitting end low-resistance radio frequency signal, so as to implement impedance matching with the transmitting antenna 10; the transmitting antenna 10 is used for transmitting the low-resistance radio-frequency signal of the transmitting end to the microphone receiving device 3.
The microphone receiving device 3 comprises a receiving antenna 11, a receiving signal matching circuit 12, a receiving end audio amplification circuit 13 and a loudspeaker 14; the receiving antenna 11 is used for receiving the transmitting end low-resistance radio frequency signal sent by the microphone transmitting device 1; the receiving signal matching circuit 12 is respectively connected with the receiving antenna 11 and the receiving end audio amplification circuit 13, and is configured to convert and demodulate the low-resistance radio frequency signal of the transmitting end to obtain a receiving audio signal; the receiving end audio amplifying circuit 13 is connected to the loudspeaker 14, and is configured to amplify and perform impedance conversion on the received audio signal to obtain a converted audio signal; the loudspeaker 14 is configured to generate sound according to the converted audio signal and to transmit the sound.
Fig. 2 is a schematic circuit diagram of a microphone transmitter according to an embodiment of the present invention. Referring to fig. 2, the transmitting-end audio amplifying circuit 8 includes: the circuit comprises a triode Q1, a triode Q2, a triode Q3, a resistor R1, a resistor R2, a slide rheostat R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, a capacitor C7, a capacitor C8 and an inductor L1. In this embodiment, the resistances corresponding to the resistor R1, the resistor R2, the resistor R4, the resistor R5, the resistor R6, and the resistor R7 are 3K9, 1M, 5K8, 220R, 4K7, and 100R, respectively; the resistances of the capacitor C1, the capacitor C2, the capacitor C3, the capacitor C4, the capacitor C5, the capacitor C6, the capacitor C7, and the capacitor C8 are 4n7, 220p, 39n, 22n, 100u, 0.47u, 4n7, and 33u, respectively.
The base of the triode Q1 is connected to one ends of the resistor R1, the resistor R2, the capacitor C1 and the capacitor C2, respectively, the other end of the resistor R2 and the other end of the capacitor C2 are both connected to the collector of the triode Q1, the other end of the resistor R1 is connected to one end of the capacitor C3, the other end of the capacitor C3 is connected to the sliding end of the sliding rheostat R3 and one end of the microphone 14, and the other end of the microphone 14, the other end of the capacitor C1 and the emitter of the triode Q1 are all connected to the negative electrode of the emitter power supply.
The base electrode of the triode Q2 is respectively connected with the collector electrode of the triode Q1, one end of the resistor R4 and one end of the capacitor C4, the collector of the triode Q2 is connected with one end of the inductor L1, the other end of the inductor L1 is connected with the positive electrode of the transmitting end power supply through a switch, the other end of the inductor L1 is further connected to one end of the resistor R5, the other end of the resistor R5 is connected to the other end of the resistor R4, one end of the resistor R6, and one end of the capacitor C5, the other end of the resistor R6 is respectively connected with one end of the capacitor C6 and one end of the capacitor C7, the other end of the capacitor C6 is connected with one fixed end of the sliding rheostat R3, and the other fixed end of the sliding rheostat R3, the other end of the capacitor C7, the other end of the capacitor C4 and the other end of the capacitor C5 are all connected with the negative electrode of the transmitting end power supply; the collector of the transistor Q2 is also connected to the transmit signal matching circuit 9.
The base electrode of the triode Q3 is connected with the emitter electrode of the triode Q2, the collector electrode of the triode Q3 is connected with the collector electrode of the triode Q2, the emitter electrode of the triode Q3 is respectively connected with one end of the resistor R7 and one end of the capacitor C8, and the other end of the resistor R7 and the other end of the capacitor C8 are respectively connected with the negative electrode of the emitter power supply.
The transmission signal matching circuit 9 includes: the high-frequency-ratio resonant cavity comprises a triode Q4, a resistor R8, a resistor R9, a resistor R10, a capacitor C9, a capacitor C10, a capacitor C11, a capacitor C12, a capacitor C13, a capacitor C14, a resonator S, a transmitting-end radio frequency transformer and an inductor L4. In this embodiment, the resistances corresponding to the resistor R8, the resistor R9, and the resistor R10 are 33K, 56R, and 56R, respectively; the capacitance values of the capacitor C9, the capacitor C10, the capacitor C11, the capacitor C12, the capacitor C13 and the capacitor C14 are 39n, 82p, 33p, 15p, 10n and 22n respectively; the transmitting end radio frequency transformer consists of a primary coil L2 and a secondary coil L3, the number of turns of the primary coil L2 is 2 turns, and the number of turns of the secondary coil L3 is 9 turns.
A base of the triode Q4 is connected to one end of the resistor R8, the resistor R9 and the capacitor C9, the other end of the capacitor C9 is connected to one end of the resonator S, the other end of the resistor R9 and the other end of the resonator S are connected to a cathode of the emitter power supply, an emitter of the triode Q4 is connected to one end of the resistor R10, the capacitor C10 and the capacitor C11, the other ends of the resistor R10 and the capacitor C10 are connected to a cathode of the emitter power supply, a collector of the triode Q4 is connected to the other end of the capacitor C11 and one end of a secondary coil L3 of the emitter radio frequency transformer, one end of a primary coil L2 of the emitter radio frequency transformer is connected to a cathode of the emitter power supply, and the other end of the primary coil L2 is connected to one end of the capacitor C12, and the other end of the emitter power supply, The transmitting terminal audio frequency amplifying circuit 8 is connected with one end of the inductor L4, the other end of the inductor L4 is connected with the transmitting antenna 10, the other end of the resistor R8, the other end of the secondary coil L3, one end of the capacitor C13 and one end of the capacitor C14 are connected with the transmitting terminal audio frequency amplifying circuit 8, and the other end of the capacitor C12, the capacitor C13 and the other end of the capacitor C14 are connected with the negative electrode of the transmitting terminal power supply.
Fig. 3 is a schematic circuit diagram of a microphone receiving device according to an embodiment of the present invention. Referring to fig. 3, the received signal matching circuit 12 includes: the circuit comprises a triode Q5, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a capacitor C15, a capacitor C16, a capacitor C17, a capacitor C18, a capacitor C19, a capacitor C20, a receiving end radio frequency transformer and an inductor L7. In this embodiment, the resistances corresponding to the resistor R11, the resistor R12, the resistor R13, and the resistor R14 are 33K, 56R, and 56R, respectively; the capacitance values of the capacitor C15, the capacitor C16, the capacitor C17, the capacitor C18, the capacitor C19 and the capacitor C20 are 39n, 33p, 82p, 15p and 10n respectively; the receiving end radio frequency transformer comprises a primary coil L6 and a secondary coil L5, the number of turns of the primary coil L6 is 2 turns, and the number of turns of the secondary coil L5 is 9 turns.
The base electrode of the triode Q5 is respectively connected with one end of the resistor R11, the resistor R12 and the capacitor C15, the other end of the resistor R12 and the other end of the capacitor C15 are both connected with the negative electrode of a receiving end power supply, the emitter electrode of the triode Q5 is respectively connected with one end of the resistor R13, the capacitor C16 and one end of the capacitor C17, the other end of the resistor R13 and the other end of the capacitor C17 are both connected with one end of the resistor R14, one end of the resistor R14 is further connected with the capacitor C18, the other end of the resistor R14 and the other end of the capacitor C18 are both connected with the negative electrode of the receiving end power supply, the collector electrode of the triode Q5 is respectively connected with the other end of the capacitor C16 and one end of the secondary coil L5 of the receiving end rf transformer, one end of the primary coil L6 of the receiving end rf transformer is connected with the negative electrode of the receiving end power supply, the other end of the primary coil L6 is connected to one end of the capacitor C19, the receiving end audio amplifier circuit 13 and one end of the inductor L7, the other end of the inductor L7 is connected to the receiving antenna 11, the other end of the resistor R11, the other end of the secondary coil L5 and one end of the capacitor C20 are all connected to the receiving end audio amplifier circuit 13, and the other ends of the capacitor C19 and the capacitor C20 are all connected to the negative electrode of the receiving end power supply.
The receiving-end audio amplifying circuit 13 includes: triode Q6, triode Q7, triode Q8, resistor 15, resistor 16, slide rheostat R17, resistor 18, resistor 19, resistor 20, resistor 21, capacitor C21, capacitor C22, capacitor C23, capacitor C24, capacitor C25, capacitor C26, capacitor C27, capacitor C28 and an impedance transformer. In this embodiment, the resistances of the resistor 15, the resistor 16, the resistor 18, the resistor 19, the resistor 20, and the resistor 21 are 3K9, 1M, 5K8, 220R, 4K7, and 100R, respectively; the resistances of the capacitor C21, the capacitor C22, the capacitor C23, the capacitor C24, the capacitor C25, the capacitor C26, the capacitor C27, and the capacitor C28 are 4n7, 220p, 39n, 22n, 100u, 0.47u, 4n7, and 33u, respectively.
The base of the triode Q6 is connected to one end of the resistor 15, the resistor R16, the capacitor C21 and the capacitor C22, respectively, the other end of the resistor R16 and the other end of the capacitor C22 are both connected to the collector of the triode Q6, the other end of the resistor R15 is connected to one end of the capacitor C23, the other end of the capacitor C23 is connected to the sliding end of the sliding rheostat R17, respectively, and the other end of the capacitor 21 and the emitter of the triode Q6 are both connected to the negative electrode of the receiving end power supply.
The base of the triode Q7 is connected with the collector of the triode Q6, one end of the resistor R18 and one end of the capacitor C24, the collector of the triode Q7 is connected with one end of the secondary coil L8 of the impedance conversion transformer, the other end of the secondary coil L8 is connected with the anode of the receiving end power supply through a switch, one end of the primary coil L9 of the impedance conversion transformer is connected with the cathode of the receiving end power supply, the other end of the primary coil L9 is connected with one end of the loudspeaker 14, the other end of the loudspeaker 14 is connected with the cathode of the receiving end power supply, the other end of the secondary coil L8 is further connected with one end of the resistor R19, the other end of the resistor R19 is connected with the other end of the resistor R18, one end of the resistor R20 and one end of the capacitor 25, and the other end of the resistor R20 is connected with one end of the capacitor C26, and the other end of the capacitor C26, One end of the capacitor C27 is connected, the other end of the capacitor C26 is connected with one fixed end of the slide rheostat R17, and the other fixed end of the slide rheostat R17, the other end of the capacitor C27, the other end of the capacitor C24 and the other end of the capacitor C25 are all connected with the negative electrode of the receiving-end power supply.
The base electrode of the triode Q8 is connected with the emitter electrode of the triode Q7, the collector electrode of the triode Q8 is connected with the collector electrode of the triode Q7, the emitter electrode of the triode Q8 is respectively connected with one end of the resistor R21 and one end of the capacitor C28, and the other end of the resistor R21 and the other end of the capacitor C28 are respectively connected with the negative electrode of the receiving end power supply.
In this embodiment, the technical indexes of the transistor Q1, the transistor Q2, the transistor Q3, the transistor Q4, the transistor Q5, the transistor Q6, the transistor Q7, and the transistor Q8 are the same.
In an alternative embodiment, the resonator S is a quartz crystal resonator; the resonator S has a frequency of 27 MHz.
In an alternative embodiment, the resistance value of the sliding rheostat R3 ranges from 0 to 10k Ω; the resistance value of the slide rheostat R17 ranges from 0 to 10k omega.
The working principle of the total station for transmitting the call in the embodiment is as follows: the transmitter 1 adopts 9V power supply, the person at the receiver 3 only needs to receive the words and gesture the action to be taken after hearing to let the other person know, the person at the receiver 3 does not need to talk, and the receiver 3 does not need transmitting function, thus reducing the complexity of the circuit. The specific working principle of the microphone transmitting device 1 is as follows: the sound pick-up 7 generates audio signals which are amplified and transmitted to the Q4 through Q1, Q2 and Q3 amplifying circuits, a 33pF capacitor is arranged between a collector and an emitter of the Q4 to generate oscillation, a 27MHz resonator is arranged at a base to generate resonance, a power supply of the Q4 is provided by a coil of a transmitting end radio frequency transformer, the Q4 modulates the received audio signals to obtain radio frequency signals, the radio frequency signals are subjected to low-resistance conversion through the transmitting end radio frequency transformer, and the radio frequency signals are transmitted after being matched with impedance of the transmitting antenna 10. The specific working principle of the call receiving device 3 is as follows: the receiving antenna 11 receives radio frequency signals, the radio frequency signals are received by a primary coil L6 matched with the signals of the receiving antenna 11 and a capacitor C19 in a resonant mode, the signals are filtered out, the signals are coupled to a secondary coil L5 through a coil, the radio frequency signals are amplified to an emitter stage for output through a Q5 with a grounded base, and audio signals are demodulated by utilizing the diode detection characteristic between the emitter stage and the base; after the audio frequency amplification of Q6, Q7 and Q8, the audio frequency is converted by the impedance of a transformer to push the load of the loudspeaker 14, thereby realizing the receiving of sound.
The total station for transmitting calls in the embodiment has the advantages of simple structure, strong practicability, capability of realizing short-distance transmission and capability of avoiding power waste in the transmission process.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (5)
1. A total station for transmitting a telephone call, comprising: the system comprises a microphone transmitting device, a total station host end, a microphone receiving device and a total station prism end;
the microphone transmitting device is arranged on a total station host at the total station host end and is electrically connected with the total station host; the microphone receiving device is arranged in a lens cover of a total station prism at the prism end of the total station;
the microphone transmitting device comprises a pickup, a transmitting end audio amplification circuit, a transmitting signal matching circuit and a transmitting antenna; the pickup is used for generating a transmitting audio signal; the transmitting end audio amplifying circuit is respectively connected with the sound pick-up and the transmitting signal matching circuit and is used for amplifying the received transmitting audio signal to obtain a transmitting audio amplifying signal; the transmitting signal matching circuit is connected with the transmitting antenna and used for modulating the received transmitting audio amplification signal to obtain a transmitting end radio frequency signal and performing impedance conversion on the transmitting end radio frequency signal to obtain a transmitting end low-resistance radio frequency signal so as to realize impedance matching with the transmitting antenna; the transmitting antenna is used for transmitting the low-resistance radio-frequency signal of the transmitting end to the microphone receiving device;
the microphone receiving device comprises a receiving antenna, a received signal matching circuit, a receiving end audio amplification circuit and a loudspeaker; the receiving antenna is used for receiving the transmitting end low-resistance radio frequency signal transmitted by the microphone transmitting device; the receiving signal matching circuit is respectively connected with the receiving antenna and the receiving end audio amplification circuit and is used for converting and demodulating the low-resistance radio-frequency signal of the transmitting end to obtain a receiving audio signal; the receiving end audio amplifying circuit is connected with the loudspeaker and used for amplifying and impedance converting the received audio signal to obtain a converted audio signal; the loudspeaker is used for generating sound according to the converted audio signal and transmitting the sound;
the transmitting-end audio amplifying circuit includes: a triode Q1, a triode Q2, a triode Q3, a resistor R1, a resistor R2, a slide rheostat R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, a capacitor C7, a capacitor C8 and an inductor L1;
the base of the triode Q1 is connected to one ends of the resistor R1, the resistor R2, the capacitor C1 and the capacitor C2, respectively, the other end of the resistor R2 and the other end of the capacitor C2 are both connected to the collector of the triode Q1, the other end of the resistor R1 is connected to one end of the capacitor C3, the other end of the capacitor C3 is connected to the sliding end of the sliding rheostat R3 and one end of the microphone, and the other end of the microphone, the other end of the capacitor C1 and the emitter of the triode Q1 are all connected to the negative electrode of the emitter power supply;
the base electrode of the triode Q2 is respectively connected with the collector electrode of the triode Q1, one end of the resistor R4 and one end of the capacitor C4, the collector of the triode Q2 is connected with one end of the inductor L1, the other end of the inductor L1 is connected with the positive electrode of the transmitting end power supply through a switch, the other end of the inductor L1 is further connected to one end of the resistor R5, the other end of the resistor R5 is connected to the other end of the resistor R4, one end of the resistor R6, and one end of the capacitor C5, the other end of the resistor R6 is respectively connected with one end of the capacitor C6 and one end of the capacitor C7, the other end of the capacitor C6 is connected with one fixed end of the sliding rheostat R3, and the other fixed end of the sliding rheostat R3, the other end of the capacitor C7, the other end of the capacitor C4 and the other end of the capacitor C5 are all connected with the negative electrode of the transmitting end power supply; the collector of the triode Q2 is also connected with the emission signal matching circuit;
the base electrode of the triode Q3 is connected with the emitter electrode of the triode Q2, the collector electrode of the triode Q3 is connected with the collector electrode of the triode Q2, the emitter electrode of the triode Q3 is respectively connected with one end of the resistor R7 and one end of the capacitor C8, and the other end of the resistor R7 and the other end of the capacitor C8 are respectively connected with the negative electrode of the emitter power supply;
the transmission signal matching circuit includes: a triode Q4, a resistor R8, a resistor R9, a resistor R10, a capacitor C9, a capacitor C10, a capacitor C11, a capacitor C12, a capacitor C13, a capacitor C14, a resonator S, an emitting end radio frequency transformer and an inductor L4;
a base of the triode Q4 is connected to one end of the resistor R8, the resistor R9 and the capacitor C9, the other end of the capacitor C9 is connected to one end of the resonator S, the other end of the resistor R9 and the other end of the resonator S are connected to a cathode of the emitter power supply, an emitter of the triode Q4 is connected to one end of the resistor R10, the capacitor C10 and the capacitor C11, the other ends of the resistor R10 and the capacitor C10 are connected to a cathode of the emitter power supply, a collector of the triode Q4 is connected to the other end of the capacitor C11 and one end of a secondary coil L3 of the emitter radio frequency transformer, one end of a primary coil L2 of the emitter radio frequency transformer is connected to a cathode of the emitter power supply, and the other end of the primary coil L2 is connected to one end of the capacitor C12, and the other end of the emitter power supply, The transmitting end audio frequency amplifying circuit is connected with one end of the inductor L4, the other end of the inductor L4 is connected with the transmitting antenna, the other end of the resistor R8, the other end of the secondary coil L3, one end of the capacitor C13 and one end of the capacitor C14 are all connected with the transmitting end audio frequency amplifying circuit, and the other ends of the capacitor C12, the capacitor C13 and the capacitor C14 are all connected with the negative electrode of the transmitting end power supply;
the received signal matching circuit includes: the circuit comprises a triode Q5, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a capacitor C15, a capacitor C16, a capacitor C17, a capacitor C18, a capacitor C19, a capacitor C20, a receiving end radio frequency transformer and an inductor L7;
the base electrode of the triode Q5 is respectively connected with one end of the resistor R11, the resistor R12 and the capacitor C15, the other end of the resistor R12 and the other end of the capacitor C15 are both connected with the negative electrode of a receiving end power supply, the emitter electrode of the triode Q5 is respectively connected with one end of the resistor R13, the capacitor C16 and one end of the capacitor C17, the other end of the resistor R13 and the other end of the capacitor C17 are both connected with one end of the resistor R14, one end of the resistor R14 is further connected with the capacitor C18, the other end of the resistor R14 and the other end of the capacitor C18 are both connected with the negative electrode of the receiving end power supply, the collector electrode of the triode Q5 is respectively connected with the other end of the capacitor C16 and one end of the secondary coil L5 of the receiving end rf transformer, one end of the primary coil L6 of the receiving end rf transformer is connected with the negative electrode of the receiving end power supply, the other end of the primary coil L6 is connected to one end of the capacitor C19, the receiving end audio amplifier circuit and one end of the inductor L7, respectively, the other end of the inductor L7 is connected to the receiving antenna, the other end of the resistor R11, the other end of the secondary coil L5 and one end of the capacitor C20 are all connected to the receiving end audio amplifier circuit, and the other ends of the capacitor C19 and the capacitor C20 are all connected to the negative electrode of the receiving end power supply;
the receiving end audio amplification circuit includes: the circuit comprises a triode Q6, a triode Q7, a triode Q8, a resistor 15, a resistor 16, a slide rheostat R17, a resistor 18, a resistor 19, a resistor 20, a resistor 21, a capacitor C21, a capacitor C22, a capacitor C23, a capacitor C24, a capacitor C25, a capacitor C26, a capacitor C27, a capacitor C28 and an impedance conversion transformer;
the base of the triode Q6 is connected to one end of the resistor 15, the resistor R16, the capacitor C21 and the capacitor C22, respectively, the other end of the resistor R16 and the other end of the capacitor C22 are both connected to the collector of the triode Q6, the other end of the resistor R15 is connected to one end of the capacitor C23, the other end of the capacitor C23 is connected to the sliding end of the sliding rheostat R17, respectively, the other end of the capacitor 21 and the emitter of the triode Q6 are both connected to the negative electrode of the receiving end power supply;
the base of the triode Q7 is connected with the collector of the triode Q6, one end of the resistor R18 and one end of the capacitor C24, the collector of the triode Q7 is connected with one end of the secondary coil L8 of the impedance conversion transformer, the other end of the secondary coil L8 is connected with the anode of the receiving end power supply through a switch, one end of the primary coil L9 of the impedance conversion transformer is connected with the cathode of the receiving end power supply, the other end of the primary coil L9 is connected with one end of the microphone, the other end of the microphone is connected with the cathode of the receiving end power supply, the other end of the secondary coil L8 is also connected with one end of the resistor R19, the other end of the resistor R19 is connected with the other end of the resistor R18, one end of the resistor R20 and one end of the capacitor 25, and the other end of the resistor R20 is connected with one end of the capacitor C26, and the other end of the capacitor C26, One end of the capacitor C27 is connected, the other end of the capacitor C26 is connected with one fixed end of the slide rheostat R17, and the other fixed end of the slide rheostat R17, the other end of the capacitor C27, the other end of the capacitor C24 and the other end of the capacitor C25 are all connected with the negative electrode of the receiving-end power supply;
the base electrode of the triode Q8 is connected with the emitter electrode of the triode Q7, the collector electrode of the triode Q8 is connected with the collector electrode of the triode Q7, the emitter electrode of the triode Q8 is respectively connected with one end of the resistor R21 and one end of the capacitor C28, and the other end of the resistor R21 and the other end of the capacitor C28 are respectively connected with the negative electrode of the receiving end power supply.
2. A total station for transmitting words, according to claim 1, characterised in that said resonator S is a quartz crystal resonator.
3. A total station for speaking according to claim 1, characterised in that said resonator S has a frequency of 27 MHz.
4. The total station for transmitting words of claim 1, wherein said slide rheostat R3 has a resistance value in the range of 0-10k Ω.
5. The total station for transmitting words of claim 1, wherein said slide rheostat R17 has a resistance value in the range of 0-10k Ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811477136.6A CN109596111B (en) | 2018-12-05 | 2018-12-05 | Total station for transmitting telephone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811477136.6A CN109596111B (en) | 2018-12-05 | 2018-12-05 | Total station for transmitting telephone |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109596111A CN109596111A (en) | 2019-04-09 |
| CN109596111B true CN109596111B (en) | 2021-09-10 |
Family
ID=65961052
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811477136.6A Active CN109596111B (en) | 2018-12-05 | 2018-12-05 | Total station for transmitting telephone |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109596111B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204349980U (en) * | 2014-12-12 | 2015-05-20 | 柳州铁道职业技术学院 | Spi bus data distance transmission system |
| CN208028914U (en) * | 2017-10-16 | 2018-10-30 | 石家庄伟钧电子科技有限公司 | A kind of portable WIFI signal amplifier |
Family Cites Families (35)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86209239U (en) * | 1986-11-17 | 1988-03-16 | 浙江师范大学 | Wineless pick-up of stringed music instrument |
| CN2096186U (en) * | 1990-07-16 | 1992-02-12 | 张铁声 | Remote control lamp cap |
| CN2084685U (en) * | 1990-10-24 | 1991-09-11 | 王岩国 | Multifunctional sound accompaniment repeater |
| CN2132346Y (en) * | 1992-05-04 | 1993-05-05 | 王宝民 | Amplitude-modulated transmitter and amplitude-modulated receiver |
| SE513813C2 (en) * | 1993-02-05 | 2000-11-06 | Ericsson Ge Mobile Communicat | Device with SAW filter for duplex transmission |
| CN2168366Y (en) * | 1993-04-20 | 1994-06-08 | 霍立远 | Vertical radio receiver for blind person and normal person |
| CN2178405Y (en) * | 1993-06-26 | 1994-09-28 | 中国矿业大学 | Speech communication device for photoelectric range finder |
| JPH0775166A (en) * | 1993-08-31 | 1995-03-17 | Sanyo Electric Co Ltd | Digital cordless telephone system |
| CN2296601Y (en) * | 1996-09-08 | 1998-11-04 | 李广泮 | Wireless languige teaching machine |
| CN2265035Y (en) * | 1996-09-28 | 1997-10-15 | 李会斌 | Radio monitor |
| US6119355A (en) * | 1998-06-02 | 2000-09-19 | Trimble Navigation Limited | Audible tilt sensor calibration |
| CN2392320Y (en) * | 1999-11-15 | 2000-08-16 | 范振东 | Device for transferring and transmission of video/audio signals |
| CN2400970Y (en) * | 1999-12-10 | 2000-10-11 | 陈龙明 | Wireless telephone for tour conductor and tourist |
| US7161422B2 (en) * | 2003-01-03 | 2007-01-09 | Junghyun Kim | Multiple power mode amplifier with bias modulation option and without bypass switches |
| US7336078B1 (en) * | 2003-10-04 | 2008-02-26 | Seektech, Inc. | Multi-sensor mapping omnidirectional sonde and line locators |
| CN2834028Y (en) * | 2005-10-15 | 2006-11-01 | 高艳英 | Audio signal repeater |
| CN201111709Y (en) * | 2007-05-28 | 2008-09-10 | 杨文喜 | Car remote-controlling tail lamp and remote control circuit thereof |
| US8494561B2 (en) * | 2007-05-30 | 2013-07-23 | Trimble Ab | Radio network list for vehicle control and real time position data |
| CN201127016Y (en) * | 2007-09-13 | 2008-10-01 | 上海维恩佳得数码科技有限公司 | Transmission power amplifier circuit of EAS system |
| CN101420237A (en) * | 2007-10-22 | 2009-04-29 | 鸿富锦精密工业（深圳）有限公司 | Monitoring circuit |
| CN201191824Y (en) * | 2008-04-25 | 2009-02-04 | 河北理工大学 | Radio transmitter |
| DE112009005524B3 (en) * | 2008-11-17 | 2018-01-25 | Faro Technologies, Inc. | Apparatus and method for measuring six degrees of freedom |
| US8423068B2 (en) * | 2009-02-12 | 2013-04-16 | Clearwire Ip Holdings Llc | Quality of service based multi-antenna mode switching |
| CN202696545U (en) * | 2012-07-30 | 2013-01-23 | 西安邮电大学 | Linear wideband high-frequency power amplifier |
| CN102932711B (en) * | 2012-10-23 | 2014-12-10 | 成都众询科技有限公司 | Wireless microphone signal transmitting circuit |
| CN203375964U (en) * | 2013-07-04 | 2014-01-01 | 苏州一光仪器有限公司 | Total station and setting-out survey device |
| CN203504550U (en) * | 2013-10-23 | 2014-03-26 | 成都艺创科技有限公司 | Receiver circuit for remote router |
| CN104660275A (en) * | 2013-11-25 | 2015-05-27 | 成都麦客堂信息技术有限公司 | Short wave amplitude modulated transmitter circuit |
| CN203758501U (en) * | 2014-01-26 | 2014-08-06 | 广州市市政工程设计研究院 | Mobile on-site topographic survey mapping device |
| CN104634330A (en) * | 2015-02-12 | 2015-05-20 | 重庆交通大学 | Controllable light-emitting prism device |
| CN204836143U (en) * | 2015-07-30 | 2015-12-02 | 南宁凯美电子科技有限公司 | Broadcasting frequency modulation wireless transmitting circuit |
| CN205265665U (en) * | 2015-12-28 | 2016-05-25 | 北京创新纪技术开发有限公司 | Radio signal send system |
| CN106487333B (en) * | 2016-10-14 | 2019-11-05 | 北京无线电计量测试研究所 | A kind of constant current ionization energizing circuit |
| CN207518549U (en) * | 2017-12-18 | 2018-06-19 | 河南省轻工业职工大学 | A kind of power amplification circuit for being used to communicate transmitter |
| CN208189211U (en) * | 2018-05-25 | 2018-12-04 | 张建强 | A kind of hand scroll silica gel qin audio wireless transmission device |
-
2018
- 2018-12-05 CN CN201811477136.6A patent/CN109596111B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204349980U (en) * | 2014-12-12 | 2015-05-20 | 柳州铁道职业技术学院 | Spi bus data distance transmission system |
| CN208028914U (en) * | 2017-10-16 | 2018-10-30 | 石家庄伟钧电子科技有限公司 | A kind of portable WIFI signal amplifier |
Non-Patent Citations (1)
| Title |
|---|
| 全站仪实用功能浅析及发展趋势展望;陈文昭;《江西测绘》;20051225;第33-35页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109596111A (en) | 2019-04-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203708487U (en) | Bluetooth device with multifunctional coil | |
| CN204272108U (en) | A kind ofly can support the communicator of ultrashort wave relaying with short-wave radio set intercommunication | |
| CN103781009A (en) | Bluetooth equipment with multifunctional coil | |
| CN203608193U (en) | Hand-held short-wave radio station based on radio frequency digitalization | |
| CN109596111B (en) | Total station for transmitting telephone | |
| CN100405747C (en) | Radio with interphone | |
| JP4431068B2 (en) | Radio with charging function | |
| CN205356344U (en) | Relaying communication device of on -vehicle platform of ultrashort wave | |
| CN102595291A (en) | Minitype frequency modulation wireless microphone | |
| CN208509193U (en) | A kind of wireless K song microphone | |
| CN101150336A (en) | Earphone with radio receiving and transmission function with mobile phone | |
| CN215300623U (en) | Wireless transmission circuit and radio frequency equipment | |
| US2794857A (en) | Control circuit for communications apparatus | |
| CN210839557U (en) | Wireless audio transmission system providing real-time recording | |
| CN208174666U (en) | A kind of simple audiomonitor | |
| CN208029037U (en) | A kind of noise reduction voice collection device and sound processing system | |
| CN210670431U (en) | Wireless microphone | |
| CN218634248U (en) | Hanging-neck type UHF wireless monitoring earphone | |
| CN215934847U (en) | Hand miaow and hand miaow system | |
| CN201234297Y (en) | Micro wireless earphone, mobile terminal and communication device | |
| CN218183525U (en) | Low-power consumption wireless audio adapter and intelligent device | |
| CN207339836U (en) | A kind of binary channels intercommunication team explains equipment | |
| CN201503628U (en) | GSM remote saving alarm | |
| KR102046401B1 (en) | Communication system of a wireless microphone transmitter and a battery charger | |
| GB793543A (en) | Improvements in or relating to telephone signalling systems |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |