CN218217354U - Intercom - Google Patents
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- CN218217354U CN218217354U CN202221979858.3U CN202221979858U CN218217354U CN 218217354 U CN218217354 U CN 218217354U CN 202221979858 U CN202221979858 U CN 202221979858U CN 218217354 U CN218217354 U CN 218217354U
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Abstract
The utility model discloses an interphone, interphone is including opening signal acquisition circuit, first antenna, radio circuit, control circuit, first frequency transmitting circuit, second frequency transmitting circuit, first switching circuit, first antenna, first frequency receiving circuit, second switching circuit and sound reproduction circuit to solve the technical problem of interphone function singleness among the prior art.
Description
Technical Field
The utility model relates to an interphone belongs to intercom technical field.
Background
In the prior art, the intercom generally adopts simplex communication or duplex communication to realize the intercom, and the simplex communication means that information can only be transmitted in a single direction at the same time: you say i listen, i say you listen. Such a radio intercom in which the transmitter and the receiver can operate alternately but not simultaneously is called a simplex. The work of the simplex machine is to control the conversion of receiving and sending with the key set, when pressing and launching the control key, launch and is in the working condition, receive and is in the non-working condition; otherwise, when the transmitting button is released, the transmitting is in a non-operating state, and the receiving is in an operating state. The singleplexers are further classified into common-frequency singleplexers (or called single-frequency machines) and different-frequency singleplexers (or called dual-frequency machines, quasi-dual-frequency machines, and semi-dual-frequency machines) according to the frequency use condition. But the disadvantages are that: two parties need to speak alternately, namely after the other party finishes speaking, my party can only speak, and the use is not as convenient as making a call.
Duplex communication means that information can be transmitted bidirectionally at the same time, and like making a call, the user can listen while speaking, and listen while speaking. The transmitter and the receiver have certain requirements on two frequency differences at two different frequencies respectively, and the duplexer capable of working simultaneously is also called a different-frequency duplexer. The duplex machine comprises a duplex hand-held machine, a duplex vehicle-mounted machine and a duplex base/transfer platform. The duplex handset mostly works in a span way on a VHF frequency band and a UHF frequency band. Duplex handsets are commonly referred to as span duplex handsets. When the dual-frequency antenna works, the dual-frequency antenna transmits in a VHF frequency band and receives in a UHF frequency band, or transmits in an UF frequency band and receives in a VHF frequency band, the circuit design of the duplex communication is complex, the price is high, and particularly, the dual-frequency antenna is not economical in the utilization of frequency resources.
The interphone based on the two principles can only realize independent alternate conversation or bidirectional conversation and cannot have the advantages and the disadvantages of the two.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an intercom solves the technical problem of intercom function singleness among the prior art.
In order to achieve the above object, an interphone includes:
a start signal acquisition circuit for acquiring a start signal;
a first antenna;
the radio circuit is used for acquiring a human voice signal;
the control circuit is connected with the starting signal acquisition circuit and the radio circuit and outputs a first switching signal and a second switching signal according to the starting signal;
the first frequency transmitting circuit is connected with the control circuit and is used for modulating the human voice signal into a first frequency audio signal and then outputting the first frequency audio signal to the control circuit;
the second frequency transmitting circuit is connected with the control circuit and is used for modulating the human voice signal into a second frequency audio signal and then outputting the second frequency audio signal to the control circuit;
a first switching circuit, connected to the first frequency transmitting circuit, the second frequency transmitting circuit, and the first antenna, respectively, and configured to turn on a path between the first antenna and the first frequency transmitting circuit or a path between the first antenna and the second frequency transmitting circuit according to the first switching signal;
the first antenna is connected with the first switching circuit and is used for receiving or sending the first frequency audio signal and the second frequency audio signal;
the first frequency receiving circuit is used for demodulating the first frequency audio signal received by the first antenna and outputting the demodulated first frequency audio signal to the control circuit;
the second frequency receiving circuit is used for demodulating the first frequency audio signal received by the first antenna and outputting the demodulated first frequency audio signal to the control circuit;
a second switching circuit, connected to the first frequency receiving circuit, the second frequency receiving circuit, and the first antenna, respectively, and configured to turn on a path between the first antenna and the first frequency receiving circuit or a path between the first antenna and the second frequency receiving circuit according to the second switching signal;
and the playback circuit is connected with the control circuit and plays the demodulated first frequency audio signal or the demodulated second frequency audio signal.
Optionally, the switching signal obtaining circuit includes a key module, and the key module includes at least two of a first path start key, a second path start key, a third path start key, and a fourth path start key.
Optionally, the first frequency transmitting circuit or the second frequency transmitting circuit includes an amplifying module, a power amplifier module, and a first filtering module, which are connected in sequence.
Optionally, the first frequency receiving circuit or the second frequency receiving circuit includes a first frequency mixing module, a second filtering module, a second frequency mixing module, and a third filtering module, which are connected in sequence.
Optionally, the playback circuit comprises a speaker.
Optionally, the radio reception circuit comprises a microphone.
Optionally, the intercom operating circuit further includes a second antenna, and the second antenna is connected to the first switching circuit and the second switching circuit respectively;
the first switching circuit is further configured to turn on a path between the first antenna and the first frequency transmitting circuit or a path between the first antenna and the second frequency transmitting circuit or a path between the second antenna and the first frequency transmitting circuit or a path between the second antenna and the second frequency transmitting circuit according to the first switching signal;
the second switching circuit is further configured to turn on a path between the first antenna and the first frequency receiving circuit, or turn on a path between the first antenna and the second frequency receiving circuit, or turn on a path between the second antenna and the first frequency receiving circuit, or turn on a path between the second antenna and the second frequency receiving circuit according to the first switching signal.
In order to achieve the above object, the utility model also provides an intercom, the intercom includes:
a start signal acquisition circuit for acquiring a start signal;
a first antenna;
the radio circuit is used for acquiring a human voice signal;
the control circuit is connected with the radio receiving circuit;
the first frequency transmitting circuit is connected with the control circuit and is used for modulating the human voice signal into a first frequency audio signal and then outputting the first frequency audio signal to the control circuit;
the second frequency transmitting circuit is connected with the control circuit and is used for modulating the human voice signal into a second frequency audio signal and then outputting the second frequency audio signal to the control circuit;
a first switching circuit, which is respectively connected to the start signal obtaining circuit, the first frequency transmitting circuit, the second frequency transmitting circuit and the first antenna, and conducts a path between the first antenna and the first frequency transmitting circuit or a path between the first antenna and the second frequency transmitting circuit according to the start signal;
the first antenna is connected with the first switching circuit and used for receiving or sending the first frequency audio signal and the second frequency audio signal;
the first frequency receiving circuit is used for demodulating the first frequency audio signal received by the first antenna and outputting the demodulated first frequency audio signal to the control circuit;
the second frequency receiving circuit is used for demodulating the first frequency audio signal received by the first antenna and outputting the demodulated first frequency audio signal to the control circuit;
a second switching circuit, which is respectively connected to the start signal obtaining circuit, the first frequency receiving circuit, the second frequency receiving circuit and the first antenna, and switches on a path between the first antenna and the first frequency receiving circuit or a path between the first antenna and the second frequency receiving circuit according to the start signal;
and the playback circuit is connected with the control circuit and plays the demodulated first frequency audio signal or the demodulated second frequency audio signal.
Optionally, the opening signal acquiring circuit has a first signal output end, a second signal output end, a third signal output end and a fourth signal output end, the first switching circuit has a first controlled end and a second controlled end, the second switching circuit has a first controlled end and a second controlled end, the first signal output end of the opening signal acquiring circuit is connected to the first controlled end of the first switching circuit, the second signal output end of the opening signal acquiring circuit is connected to the second controlled end of the first switching circuit, the third signal output end of the opening signal acquiring circuit is connected to the first controlled end of the second switching circuit, and the fourth signal output end of the opening signal acquiring circuit is connected to the second controlled end of the second switching circuit.
The utility model discloses a set up first frequency receiving circuit, second frequency receiving circuit, first frequency transmitting circuit and second frequency transmitting circuit realize duplex and simplex's basic circuit, and realize switching on of corresponding duplex or simplex through first switching circuit and second switching circuit, for example, simplex's first frequency receiving circuit and first frequency transmitting circuit's route switch on, duplex first frequency receiving circuit and second frequency transmitting circuit's route switch on, all can realize through switching circuit, in addition, still realize corresponding the fast switch-over of route through opening signal acquisition circuit, convenience of customers controls, thereby realize that an equipment realizes simplex and duplex communication's purpose, thereby solve the technical problem of intercom function singleness among the prior art.
Drawings
Fig. 1 is a schematic block diagram of an intercom in one embodiment.
Fig. 2 is a schematic block diagram of an intercom in one embodiment.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all 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 application.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly disposed on the other element; when an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left"
The references to "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and for simplicity in description, and do not indicate or imply that the referenced device or component must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "plurality" or "a plurality" means two or more unless specifically limited otherwise.
It should be understood that the structures, ratios, sizes, and the like shown in the drawings are only used for matching the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the practical limit conditions of the present application, so that the modifications of the structures, the changes of the ratio relationships, or the adjustment of the sizes, do not have the technical essence, and the modifications, the changes of the ratio relationships, or the adjustment of the sizes, are all within the scope of the technical contents disclosed in the present application without affecting the efficacy and the achievable purpose of the present application.
In order to solve the technical problem that the self-excitation judges inaccurately among the prior art, the utility model provides an interphone.
In one embodiment, as shown in fig. 1, the intercom includes:
a turn-on signal acquiring circuit 20 for acquiring a turn-on signal;
a first antenna 10;
the radio circuit 110 is used for acquiring a human voice signal;
a control circuit 30, connected to the start signal acquiring circuit 20 and the radio receiving circuit 110, for outputting a first switching signal and a second switching signal according to the start signal;
the first frequency transmitting circuit 50 is connected with the control circuit 30 and is used for modulating the human voice signal into a first frequency audio signal and then outputting the first frequency audio signal to the control circuit 30;
the second frequency transmitting circuit 60 is connected to the control circuit 30, and is configured to modulate the human voice signal into a second frequency audio signal and output the second frequency audio signal to the control circuit 30;
a first switching circuit 40, connected to the first frequency transmitting circuit 50, the second frequency transmitting circuit 60, and the first antenna 10, respectively, and configured to turn on a path between the first antenna 10 and the first frequency transmitting circuit 50 or a path between the first antenna 10 and the second frequency transmitting circuit 60 according to the first switching signal;
a first antenna 10 connected to the first switching circuit 40 and configured to receive or transmit the first frequency audio signal and the second frequency audio signal;
a first frequency receiving circuit 80, configured to demodulate the first frequency audio signal received by the first antenna 10 and output the demodulated first frequency audio signal to the control circuit 30;
a second frequency receiving circuit 90, configured to demodulate the first frequency audio signal received by the first antenna 10 and output the demodulated first frequency audio signal to the control circuit 30;
a second switching circuit 70 connected to the first frequency receiving circuit 80, the second frequency receiving circuit 90, and the first antenna 10, respectively, for turning on a path between the first antenna 10 and the first frequency receiving circuit 80 or turning on a path between the first antenna 10 and the second frequency receiving circuit 90 according to the second switching signal;
and a playback circuit connected to the control circuit 30 and playing the demodulated first frequency audio signal or the demodulated second frequency audio signal.
The utility model discloses a set up first frequency receiving circuit 80, second frequency receiving circuit 90, first frequency transmitting circuit 50 and second frequency transmitting circuit 60 etc. realize duplex and simplex's basic circuit, and realize corresponding duplex or simplex's switching on through first switching circuit 40 and second switching circuit 70, for example, simplex's first frequency receiving circuit 80 and first frequency transmitting circuit 50's route switch on, duplex first frequency receiving circuit 80 and second frequency transmitting circuit 60's route switch on, all can realize through the switching circuit, additionally, still realize the fast switch-over that corresponds the route through opening signal acquisition circuit 20, convenience of customers controls, thereby realize the mesh that simplex and duplex communication were realized to a equipment, thereby solve the single technical problem of intercom function among the prior art.
Optionally, the switching signal obtaining circuit includes a key module, and the key module includes at least two of a first channel start key, a second channel start key, a third channel start key, and a fourth channel start key.
Optionally, the first frequency transmitting circuit 50 or the second frequency transmitting circuit 60 includes an amplifying module, a power amplifier module, and a first filtering module, which are connected in sequence.
The amplifying module amplifies the signal, the power amplifying module performs power amplifying adjustment on the signal, and the first filtering module achieves filtering, so that the purity of the signal is guaranteed.
Optionally, the first frequency receiving circuit 80 or the second frequency receiving circuit 90 includes a first frequency mixing module, a second filtering module, a second frequency mixing module, and a third filtering module, which are connected in sequence.
Wherein, first frequency mixing module and second frequency mixing module can carry out the frequency mixing with the local oscillator signal with received signal, and second filtering module and third filtering module carry out the filtering after the frequency mixing, can guarantee the clutter after the frequency mixing of filtering each time. It should be noted that, an amplifying circuit, a pre-emphasis circuit and a band-pass filter may be optionally arranged after the amplifying circuit, the pre-emphasis circuit and the band-pass filter according to needs, so as to further amplify and discriminate the signal.
Optionally, the playback circuit comprises a speaker.
Optionally, the radio reception circuitry 110 includes a microphone.
Optionally, the intercom operating circuit further includes a second antenna, and the second antenna is respectively connected to the first switching circuit 40 and the second switching circuit 70;
the first switching circuit 40 is further configured to conduct a path between the first antenna 10 and the first frequency transmitting circuit 50, or conduct a path between the first antenna 10 and the second frequency transmitting circuit 60, or conduct a path between the second antenna and the first frequency transmitting circuit 50, or conduct a path between the second antenna and the second frequency transmitting circuit 60 according to the first switching signal;
the second switching circuit 70 is further configured to turn on a path between the first antenna 10 and the first frequency receiving circuit 80, or turn on a path between the first antenna 10 and the second frequency receiving circuit 90, or turn on a path between the second antenna and the first frequency receiving circuit 80, or turn on a path between the second antenna and the second frequency receiving circuit 90 according to the first switching signal.
Referring to fig. 2, the present application further provides an intercom, including:
a turn-on signal acquiring circuit 20 for acquiring a turn-on signal;
a first antenna 10;
the radio circuit 110 is used for acquiring a human voice signal;
the control circuit 30 is connected with the sound receiving circuit 110 of the starting signal acquisition circuit 20;
the first frequency transmitting circuit 50 is connected with the control circuit 30 and is used for modulating the human voice signal into a first frequency audio signal and then outputting the first frequency audio signal to the control circuit 30;
the second frequency transmitting circuit 60 is connected to the control circuit 30, and is configured to modulate the human voice signal into a second frequency audio signal and output the second frequency audio signal to the control circuit 30;
a first switching circuit 40, connected to the start signal obtaining circuit 20, the first frequency transmitting circuit 50, the second frequency transmitting circuit 60, and the first antenna 10, respectively, and configured to turn on a path between the first antenna 10 and the first frequency transmitting circuit 50 or a path between the first antenna 10 and the second frequency transmitting circuit 60 according to the start signal;
a first antenna 10 connected to the first switching circuit 40 and configured to receive or transmit the first frequency audio signal and the second frequency audio signal;
a first frequency receiving circuit 80, configured to demodulate the first frequency audio signal received by the first antenna 10 and output the demodulated first frequency audio signal to the control circuit 30;
a second frequency receiving circuit 90, configured to demodulate the first frequency audio signal received by the first antenna 10 and output the demodulated first frequency audio signal to the control circuit 30;
a second switching circuit 70, connected to the start signal obtaining circuit 20, the first frequency receiving circuit 80, the second frequency receiving circuit 90, and the first antenna 10, respectively, and configured to turn on a path between the first antenna 10 and the first frequency receiving circuit 80 or a path between the first antenna 10 and the second frequency receiving circuit 90 according to the start signal;
and a playback circuit connected to the control circuit 30 and playing the demodulated first frequency audio signal or the demodulated second frequency audio signal.
The utility model discloses a set up first frequency receiving circuit 80, second frequency receiving circuit 90, duplex and simplex's basic circuit is realized to first frequency transmitting circuit 50 and second frequency transmitting circuit 60, and realize corresponding switching on of duplex or simplex through first switching circuit 40 and second switching circuit 70, for example, simplex's first frequency receiving circuit 80 and first frequency transmitting circuit 50's route switch on, duplex first frequency receiving circuit 80 and second frequency transmitting circuit 60's route switch on, all can realize through the switching circuit, in addition, still realize the fast switch who corresponds the route through opening signal acquisition circuit 20, convenience of customers controls, thereby realize the mesh that simplex and duplex communication were realized to a equipment, thereby solve the single technical problem of intercom function among the prior art.
Unlike the first scheme, in the present application, the direct switching of the first switching circuit 40 and the second switching circuit 70 can be realized only by turning on the signal acquiring circuit 20 without being triggered by the control circuit 30.
Optionally, the start signal obtaining circuit 20 has a first signal output end, a second signal output end, a third signal output end and a fourth signal output end, the first switching circuit 40 has a first controlled end and a second controlled end, the second switching circuit 70 has a first controlled end and a second controlled end, the first signal output end of the start signal obtaining circuit 20 is connected to the first controlled end of the first switching circuit 40, the second signal output end of the start signal obtaining circuit 20 is connected to the second controlled end of the first switching circuit 40, the third signal output end of the start signal obtaining circuit 20 is connected to the first controlled end of the second switching circuit 70, and the fourth signal output end of the start signal obtaining circuit 20 is connected to the second controlled end of the second switching circuit 70.
Optionally, the starting signal acquiring circuit 20 includes four independent pull-up circuits or pull-down circuits, and a key is disposed in the pull-down circuit or the pull-up circuit, and outputs a high level or a low level when pressed.
Optionally, the first switching circuit 40 or the second switching circuit 70 may respectively include two conducting branches, and the conducting branches may be implemented by MOS transistors, optocouplers, or magnetic switches, and are triggered to be turned on or turned off by high and low levels.
Optionally, the switching signal obtaining circuit includes a key module, and the key module includes at least two of a first channel start key, a second channel start key, a third channel start key, and a fourth channel start key.
Optionally, the first frequency transmitting circuit 50 or the second frequency transmitting circuit 60 includes an amplifying module, a power amplifier module, and a first filtering module, which are connected in sequence.
Optionally, the first frequency receiving circuit 80 or the second frequency receiving circuit 90 includes a first frequency mixing module, a second filtering module, a second frequency mixing module, and a third filtering module, which are connected in sequence.
Optionally, the playback circuit comprises a speaker.
Optionally, the radio reception circuitry 110 includes a microphone.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. An intercom, comprising:
a start signal acquisition circuit for acquiring a start signal;
a first antenna;
the radio circuit is used for acquiring a human voice signal;
the control circuit is connected with the starting signal acquisition circuit and the radio circuit and outputs a first switching signal and a second switching signal according to the starting signal;
the first frequency transmitting circuit is connected with the control circuit and is used for modulating the human voice signal into a first frequency audio signal and then outputting the first frequency audio signal to the control circuit;
the second frequency transmitting circuit is connected with the control circuit and is used for modulating the human voice signal into a second frequency audio signal and then outputting the second frequency audio signal to the control circuit;
a first switching circuit, connected to the first frequency transmitting circuit, the second frequency transmitting circuit, and the first antenna, respectively, and configured to turn on a path between the first antenna and the first frequency transmitting circuit or a path between the first antenna and the second frequency transmitting circuit according to the first switching signal;
the first antenna is connected with the first switching circuit and used for receiving or sending the first frequency audio signal and the second frequency audio signal;
the first frequency receiving circuit is used for demodulating the first frequency audio signal received by the first antenna and outputting the demodulated first frequency audio signal to the control circuit;
the second frequency receiving circuit is used for demodulating the first frequency audio signal received by the first antenna and outputting the demodulated first frequency audio signal to the control circuit;
a second switching circuit, connected to the first frequency receiving circuit, the second frequency receiving circuit, and the first antenna, respectively, and configured to turn on a path between the first antenna and the first frequency receiving circuit or a path between the first antenna and the second frequency receiving circuit according to the second switching signal;
and the playback circuit is connected with the control circuit and plays the demodulated first frequency audio signal or the demodulated second frequency audio signal.
2. The interphone according to claim 1, wherein the switching signal obtaining circuit includes a key module including at least two of a first path start key, a second path start key, a third path start key and a fourth path start key.
3. The interphone of claim 1, wherein the first frequency transmitting circuit or the second frequency transmitting circuit comprises an amplifying module, a power amplifying module and a first filtering module connected in sequence.
4. The interphone of claim 1, wherein the first frequency receiving circuit or the second frequency receiving circuit comprises a first mixing module, a second filtering module, a second mixing module and a third filtering module connected in sequence.
5. The intercom of claim 1, wherein said playback circuit includes a speaker.
6. The intercom of claim 2, wherein said radio circuitry comprises a microphone.
7. The interphone according to claim 3, characterized in that the interphone working circuit further comprises a second antenna connected with the first switching circuit and the second switching circuit, respectively;
the first switching circuit is further configured to turn on a path between the first antenna and the first frequency transmitting circuit or a path between the first antenna and the second frequency transmitting circuit or a path between the second antenna and the first frequency transmitting circuit or a path between the second antenna and the second frequency transmitting circuit according to the first switching signal;
the second switching circuit is further configured to turn on a path between the first antenna and the first frequency receiving circuit, or turn on a path between the first antenna and the second frequency receiving circuit, or turn on a path between the second antenna and the first frequency receiving circuit, or turn on a path between the second antenna and the second frequency receiving circuit according to the first switching signal.
8. An intercom, comprising:
a start signal acquisition circuit for acquiring a start signal;
a first antenna;
the radio circuit is used for acquiring a human voice signal;
the control circuit is connected with the radio receiving circuit;
the first frequency transmitting circuit is connected with the control circuit and is used for modulating the human voice signal into a first frequency audio signal and then outputting the first frequency audio signal to the control circuit;
the second frequency transmitting circuit is connected with the control circuit and is used for modulating the human voice signal into a second frequency audio signal and then outputting the second frequency audio signal to the control circuit;
a first switching circuit, which is connected to the start signal obtaining circuit, the first frequency transmitting circuit, the second frequency transmitting circuit, and the first antenna, respectively, and which conducts a path between the first antenna and the first frequency transmitting circuit or a path between the first antenna and the second frequency transmitting circuit according to the start signal;
the first antenna is connected with the first switching circuit and used for receiving or sending the first frequency audio signal and the second frequency audio signal;
the first frequency receiving circuit is used for demodulating the first frequency audio signal received by the first antenna and outputting the demodulated first frequency audio signal to the control circuit;
the second frequency receiving circuit is used for demodulating the first frequency audio signal received by the first antenna and outputting the demodulated first frequency audio signal to the control circuit;
a second switching circuit, which is respectively connected to the start signal obtaining circuit, the first frequency receiving circuit, the second frequency receiving circuit and the first antenna, and switches on a path between the first antenna and the first frequency receiving circuit or a path between the first antenna and the second frequency receiving circuit according to the start signal;
and the playback circuit is connected with the control circuit and plays the demodulated first frequency audio signal or the demodulated second frequency audio signal.
9. The intercom of claim 8, wherein the turn-on signal acquiring circuit has a first signal output terminal, a second signal output terminal, a third signal output terminal and a fourth signal output terminal, the first switching circuit has a first controlled terminal and a second controlled terminal, the second switching circuit has a first controlled terminal and a second controlled terminal, the first signal output terminal of the turn-on signal acquiring circuit is connected with the first controlled terminal of the first switching circuit, the second signal output terminal of the turn-on signal acquiring circuit is connected with the second controlled terminal of the first switching circuit, the third signal output terminal of the turn-on signal acquiring circuit is connected with the first controlled terminal of the second switching circuit, and the fourth signal output terminal of the turn-on signal acquiring circuit is connected with the second controlled terminal of the second switching circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221979858.3U CN218217354U (en) | 2022-07-28 | 2022-07-28 | Intercom |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221979858.3U CN218217354U (en) | 2022-07-28 | 2022-07-28 | Intercom |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218217354U true CN218217354U (en) | 2023-01-03 |
Family
ID=84652416
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221979858.3U Active CN218217354U (en) | 2022-07-28 | 2022-07-28 | Intercom |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218217354U (en) |
-
2022
- 2022-07-28 CN CN202221979858.3U patent/CN218217354U/en active Active
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