CN2438277Y - Building intercom receiving device capable of automatically filtering-off HF and LF interference - Google Patents
Building intercom receiving device capable of automatically filtering-off HF and LF interference Download PDFInfo
- Publication number
- CN2438277Y CN2438277Y CN 00237837 CN00237837U CN2438277Y CN 2438277 Y CN2438277 Y CN 2438277Y CN 00237837 CN00237837 CN 00237837 CN 00237837 U CN00237837 U CN 00237837U CN 2438277 Y CN2438277 Y CN 2438277Y
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- China
- Prior art keywords
- capacitor
- resistance
- connect
- receiver
- output
- Prior art date
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- Expired - Fee Related
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Abstract
The utility model relates to a receiving device for a building intercom system. The utility model adopts a structure comprising a resistance-capacitance filter, a high frequency filter, a low frequency filter, a power amplifier and a receiver, and therefore, the utility model not only can filtering off high frequency interference in broadcasting station, TV station, etc., and can also automatically filtering off low frequency interference. The adoption of the utility model can ensure that a sound transmitted from a machine at the doorway can be clearly heard even of the building intercom system adopts common conducting wires to transmit. The building intercom receiving device capable of automatically filtering-off the HF and LF interference of the utility model has the advantages of unique structure, high convenience, high practicability and low price.
Description
The utility model is a kind of receiver unit that is used for building conversational system, belongs to the innovative technology of receiver unit.
Used receiver unit in the existing building conversational system, be to adopt the high-frequency signal of directly outer circuit being sent here to amplify the structure of delivering to receiver mostly, the shortcoming of its existence is when the distance between receiver unit and the doorway machine is far away, its circuit that is connected with doorway machine is also longer, therefore, audio signal very easily is subjected to the interference of high frequency signals such as various radio station, TV station on this circuit.In addition, because building conversational system all is to use in the place that AC power is arranged, so on this circuit, also very easily sense the low-frequency disturbance that frequency is 50HZ.For avoiding the interference of low-and high-frequency, adopt the industrial siding of band screen to make transmission line in the building conversational system usually, but shielding conductor not only price is expensive, cost height, and because of the shielding conductor core is often thinner, circuit is long more, resistance is big more, loss is also big more; And the in the wrong curved property of shielding conductor is relatively poor, brings difficulty to construction.
But being to consider the problems referred to above, the purpose of this utility model provide high frequencies such as a kind of not only filtering radio station, TV station to disturb, and the building talkback receiver unit of the automatic filtering low-frequency disturbance of energy.Can guarantee that building conversational system adopts the plain conductor transmission, also can clearly hear the sound that sends from doorway machine even use the utility model.
Schematic diagram of the present utility model as shown in drawings, include capacitance-resistance filter (1), high frequency filter (2), low-frequency filter (3), power amplifier (4), receiver (5), wherein the input of high frequency filter (2) is connected with capacitance-resistance filter (1) output, the input of low-frequency filter (3) is connected with the output of high frequency filter (2), the output of low-frequency filter (3) is connected with the input of power amplifier (4), and the output of power amplifier (4) is connected with the input of receiver (5).
Describe concrete structure of the present utility model in detail below in conjunction with accompanying drawing:
Fig. 1 is a theory diagram of the present utility model;
Fig. 2 is circuit theory diagrams of the present utility model.
Theory diagram of the present utility model as shown in Figure 1, include capacitance-resistance filter (1), high frequency filter (2), low-frequency filter (3), power amplifier (4), receiver (5), wherein the input of high frequency filter (2) is connected with capacitance-resistance filter (1) output, the input of low-frequency filter (3) is connected with the output of high frequency filter (2), the output of low-frequency filter (3) is connected with the input of power amplifier (4), and the output of power amplifier (4) is connected with the input of receiver (5).Circuit theory diagrams of the present utility model as shown in Figure 2, above-mentioned capacitance-resistance filter (1) includes capacitor C
0, C
1, C
2, resistance R
1, potentiometer W; High frequency filter (2) includes capacitor C
3, C
4, C
5, high frequency amplitude limiter GZL, comparison amplifier IC
1Low-frequency filter (3) includes comparison amplifier IC
2, resistance R
2, R
3, capacitor C
6, C
7, C
8Power amplifier (4) includes ic chip 3, capacitor C
9, C
10, C
11, resistance R
4Receiver (5) is R
L, capacitor C wherein
0An end be input, the other end respectively with resistance R
1, capacitor C
1An end connect R
1The other end respectively with capacitor C
2, potentiometer W an end connect capacitor C
1, C
2, potentiometer W the equal ground connection of the other end, the control end of W respectively with capacitor C
3An end and the end of high frequency amplitude limiter GZL connect, the other end of GZL respectively with capacitor C
4An end and comparison amplifier IC
1Positive input terminal connect capacitor C
3, C
4The equal ground connection of the other end, IC
1Negative input end pass through capacitor C
5Ground connection, IC
1Output and capacitor C
6An end connect C
6The other end respectively with resistance R
2An end and capacitor C
7An end connect C
7The other end respectively with resistance R
3An end and IC
2Positive input terminal connect R
3Other end ground connection, IC
2Negative input end and capacitor C
8An end connect R
3, C
8The other end and C
9An end all and IC
2Output connect C
9The other end respectively with resistance R
4An end and IC
3Positive input terminal connect R
4The other end and IC
3The equal ground connection of negative input end, capacitor C
10Be connected IC
3Positive input terminal and output between, IC
3Output pass through capacitor C
11With receiver R
LConnect.Receiver R
LCan be receiver or loudspeaker.
When the utility model used, the input signal that is transmitted by outside line was through C
3, R
1Deliver to volume potentiometer, because C
1, C
2Less to the impedance of very high-frequency high frequency interference wave, so an existing part is by R
2Institute's step-down and by C
1, C
2Institute's bypass, then signal after the volume potentiometer output again through high frequency filter (2) to the further filtering of high frequency, the signal behind the filtering high frequency is through IC
1Send into the low frequency signal about low-frequency filter (3) elimination 50HZ to 150HZ after the amplification, again through C
9Deliver to power amplifier (4) rate of doing work and amplify, then through C
11Deliver to receiver or loudspeaker playback in the receiver (5), thereby not only filtering high frequencies such as radio station, TV station disturb, and automatically filtering low-frequency disturbance, even make building conversational system adopt the plain conductor transmission, also can clearly hear the sound that sends from doorway machine.
The utility model is owing to adopted the structure that includes capacitance-resistance filter, high frequency filter, low-frequency filter, power amplifier, receiver, therefore, but the utility model not only high frequencies such as filtering radio station, TV station disturbs, and can automatic filtering low-frequency disturbance.Can guarantee that building conversational system adopts the plain conductor transmission, also can clearly hear the sound that sends from doorway machine even use the utility model.The utility model is the building talkback receiver unit that a kind of structure uniqueness, convenient and practical, the cheap automatic filtering low-and high-frequency of energy are disturbed.
Claims (3)
1, the automatic filtering low-and high-frequency of a kind of energy is disturbed the building talkback receiver unit, it is characterized in that including capacitance-resistance filter (1), high frequency filter (2), low-frequency filter (3), power amplifier (4), receiver (5), wherein the input of high frequency filter (2) is connected with capacitance-resistance filter (1) output, the input of low-frequency filter (3) is connected with the output of high frequency filter (2), the output of low-frequency filter (3) is connected with the input of power amplifier (4), and the output of power amplifier (4) is connected with the input of receiver (5).
2, the automatic filtering low-and high-frequency of energy according to claim 1 is disturbed the building talkback receiver unit, it is characterized in that above-mentioned capacitance-resistance filter (1) includes capacitor C
0, C
1, C
2, resistance R
1, potentiometer W; High frequency filter (2) includes capacitor C
3, C
4, C
5, high frequency amplitude limiter GZL, comparison amplifier IC
1Low-frequency filter (3) includes comparison amplifier IC
2, resistance R
2, R
3, capacitor C
6, C
7, C
8Power amplifier (4) includes ic chip 3, capacitor C
9, C
10, C
11, resistance R
4Receiver (5) is R
L, capacitor C wherein
0An end be input, the other end respectively with resistance R
1, capacitor C
1An end connect R
1The other end respectively with capacitor C
2, potentiometer W an end connect capacitor C
1, C
2, potentiometer W the equal ground connection of the other end, the control end of W respectively with capacitor C
3An end and the end of high frequency amplitude limiter GZL connect, the other end of GZL respectively with capacitor C
4An end and comparison amplifier IC
1Positive input terminal connect capacitor C
3, C
4The equal ground connection of the other end, IC
1Negative input end pass through capacitor C
5Ground connection, IC
1Output and capacitor C
6An end connect C
6The other end respectively with resistance R
2An end and capacitor C
7An end connect C
7The other end respectively with resistance R
3An end and IC
2Positive input terminal connect R
3Other end ground connection, IC
2Negative input end and capacitor C
8An end connect R
3, C
8The other end and C
9An end all and IC
2Output connect C
9The other end respectively with resistance R
4An end and IC
3Positive input terminal connect R
4The other end and IC
3The equal ground connection of negative input end, capacitor C
10Be connected IC
3Positive input terminal and output between, IC
3Output pass through capacitor C
11With receiver R
LConnect.
3, disturb the building talkback receiver unit according to claim 1 or the automatic filtering low-and high-frequency of 2 described energy, it is characterized in that above-mentioned receiver R
LCan be receiver or loudspeaker.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00237837 CN2438277Y (en) | 2000-08-04 | 2000-08-04 | Building intercom receiving device capable of automatically filtering-off HF and LF interference |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00237837 CN2438277Y (en) | 2000-08-04 | 2000-08-04 | Building intercom receiving device capable of automatically filtering-off HF and LF interference |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2438277Y true CN2438277Y (en) | 2001-07-04 |
Family
ID=33599011
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00237837 Expired - Fee Related CN2438277Y (en) | 2000-08-04 | 2000-08-04 | Building intercom receiving device capable of automatically filtering-off HF and LF interference |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2438277Y (en) |
-
2000
- 2000-08-04 CN CN 00237837 patent/CN2438277Y/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |