CN1543230A - Method for avoiding noise generation in radio interphone at the end of session - Google Patents
Method for avoiding noise generation in radio interphone at the end of session Download PDFInfo
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- CN1543230A CN1543230A CNA031250114A CN03125011A CN1543230A CN 1543230 A CN1543230 A CN 1543230A CN A031250114 A CNA031250114 A CN A031250114A CN 03125011 A CN03125011 A CN 03125011A CN 1543230 A CN1543230 A CN 1543230A
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Abstract
This invention provides a method for avoiding noises of a radio interphone happening when finishing the session, in which, the interphone contains a receiving circuit. The said method includes providing a first check circuit to the interphone. When the said interphone receives a radio signal in a pre-designed frequency sphere, the first check circuit is used to detect if the said radio signal belongs to a non-standard silent audio signal, if so, the said interphone stops receiving the successive radio signals.
Description
Technical field
The present invention relates to a kind of method of avoiding wireless tranceiver to produce noise, be specifically related to a kind of method of avoiding wireless tranceiver when finishing conversation, to produce noise.
Background technology
Wireless tranceiver (walkie-talkie) is used a kind of continuous audio coding silencing system (continuous tone-coded squelch system, CTCSS) reach the function of MPTY (groupcommunication), and the major advantage of wireless tranceiver is exactly can be directly point-to-point, without any need for basic facilities, as long as both sides are transferred to identical frequency, just can launch at any time or reception information.In the field of radio communication, this continuous audio coding silencing system uses the audio signal (CTCSS tone) of low frequency to distinguish the signal that is transmitted on communication channel (channel), makes that a plurality of users can converse in communication zone.See also Fig. 1, Fig. 1 is the schematic diagram of known continuous audio coding silencing system institute frequency of utilization scope.As shown in Figure 1, frequency range between frequency 62.5Hz and the 250Hz is used for transmitting the audio signal of above-mentioned low frequency, frequency range between frequency 300Hz and the 3.4KHz then is used for the voice signal (speech signal) of transmission user, its operating principle is summarized as follows, for known portable radio intercom, generally use 14 communication channels (channel) P
1P
14Carry out signal and transmit and receive, these 14 communication channels are physical channel (physicalchannel), and in addition, each communication channel again can be according to the audio signal T of 38 different frequencies
1T
38Produce the individual logic channel of 532 (14*38) (logical channel) altogether, it is P that each first speaker is set the employed physical channel of this portable radio intercom
1And employed audio signal is T
1, that is to say that it is P that this first speaker is set its logic channel
1(T
1), when this first speaker press this portable radio intercom talk key (push-to-talk, PTT) after, this first speaker just can pass through this physical channel P
1Export its voice signal to the pairing scheduled communication scope of this portable radio intercom, if in this scheduled communication scope other 3 users are arranged, and to set its employed logic channel respectively be P
1(T
1), P
1(T
38), P
2(T
1), then for first user, because its portable radio intercom is at physical channel P
1Carry out signal and transmit and receive, therefore first user's portable radio intercom will begin to receive the voice signal that this first speaker is exported, and this portable radio intercom judges that the employed audio signal of this first speaker also is T
1, that is to say that this first speaker all sets identical logic channel P with first user
1(T
1), therefore first user's portable radio intercom just can be exported the voice signal that receives to this first speaker via a loud speaker, therefore first user just can hear the voice signal of this first speaker, for second user, because its portable radio intercom is at physical channel P
1Carry out signal and transmit and receive, therefore second user's portable radio intercom also can begin to receive the voice signal that this first speaker is exported, yet to judge the employed audio signal of this first speaker be T to this portable radio intercom
1But not T
38, that is to say that this first speaker sets different logic channel P respectively with second user
1(T
1) and P
1(T
38), therefore second user's portable radio intercom can't be exported the voice signal that receives to this first speaker via a loud speaker, so second user also can't hear the voice signal of this first speaker, for the 3rd user, because its portable radio intercom is at physical channel P
2Carrying out signal transmits and receives, therefore the 3rd user's portable radio intercom uses different communication channels respectively with this first speaker, therefore the 3rd user's portable radio intercom can't be according to received signal intensity indication (received signal strength indicator, RSSI) detected signal strength signal intensity begins to receive the signal that this first speaker transmits, therefore the 3rd user's portable radio intercom can't receive the voice signal of this first speaker, just can not export the voice signal of this first speaker via loud speaker yet, so second, three users can't hear the voice signal of this first speaker, that is to say second, three users' portable radio intercom can't start quiet (squelch) function by judging this audio signal, in other words, the user of setting same logical channel just can converse each other and reach the purpose of above-mentioned group conversation.
See also Fig. 2, Fig. 2 is the function block schematic diagram of known wireless tranceiver 10.Wireless tranceiver 10 includes an antenna (antenna) 11, one transceivers (transceiver) 12, one selectors (selector) 14, one processor 16, one voice signal processing unit, 20, one loud speakers (speaker) 17, and a microphone (microphone) 18.Wireless tranceiver 10 can receive and transmit carrier wave RF via antenna 11, for reception carrier RF, transceiver 12 is that faint high-frequency carrier signal is amplified, again high frequency carrier is converted to the intermediate-freuqncy signal of low frequency, then intermediate-freuqncy signal is carried out the voice signal Rx that the FM demodulation obtains fundamental frequency afterwards, and be sent to selector 14, because selector 14 can determine transfer path by the basis signal input/output state, in other words, when wireless tranceiver is in accepting state, that is to say when selector 14 receives input signal from transceiver 12, can select output terminals A to export this fundamental frequency signal Rx, otherwise when a wireless tranceiver was in emission state, selector 14 can be selected to use input B to transmit.16 frequencies of judging its audio signal according to fundamental frequency signal Rx of processor, generally speaking, processor 16 includes an analogue low pass filtering circuit (Low Passfilter) and is used for filtering the signal between frequency 62.5Hz and frequency 250Hz among the fundamental frequency signal Rx, and whether the audio signal of judging corresponding fundamental frequency signal Rx uses identical logic channel with decision, if the pairing logic channel of fundamental frequency signal Rx is identical with the logic channel that wireless tranceiver 10 sets, then processor 16 just can start loud speaker 17 and carry out follow-up signal output processing, voice signal processing unit 20 also includes two analogue filter circuits, the low-pass filtering that is used for extracting frequency 300Hz is to the signal between the high-pass filtering of frequency 3.4KHz, at last again via loud speaker 17 outputs.On the contrary, if the pairing logic channel of fundamental frequency signal Rx is different with the logic channel that wireless tranceiver 10 sets, then processor 16 just can not start voice signal processing unit 20 and loud speaker 17, so wireless tranceiver 10 just can not exported any signal that is transmitted via the Different Logic channel.For transmitting carrier wave RF, when a user presses this talk key, selector 14 can be chosen input B, processor 16 can start microphone 18 simultaneously, therefore this user's voice signal just can input to voice signal processing unit 20, as previously mentioned, voice signal processing unit 20 extracts frequency 300Hz to the signal between the frequency 3.4KHz via its filter circuit, and then export processor 16 to, the logic channel that processor 16 can set according to wireless tranceiver 10 and add the corresponding audio signal and produce fundamental frequency signal Tx to the output signal of voice signal processing unit 20, after at last fundamental frequency signal being carried out carrier wave RF that the FM modulation conversion is a high frequency, via antenna 11 outputs via transceiver 12.
In theory, receiving terminal when receiving the high-frequency RF signal, received signal intensity indication (RSSI) but can be higher than the critical value of receiving intensity.When high-frequency signal disappeared, the indication of received signal intensity can be lower than this critical value, and this moment, receiving terminal will mute speaker 17.When end of conversation, after that is to say that the transmitting terminal user decontrols the talk key of originally pressing, the high-frequency RF signal will stop to send, received signal intensity indication this moment by a little less than the strong commentaries on classics during this period of time, transceiver 12 still is in accepting state, so can thus, can allow the user feel quite uncomfortable with the clutter demodulation that receives and by loud speaker 17 outputs and produce harsh noise (irritatingnoise).
Summary of the invention
Therefore, the object of the present invention is to provide a kind of method of avoiding a wireless tranceiver when finishing conversation, to produce noise, to address the above problem.
Claim of the present invention provides a kind of method of avoiding wireless tranceiver to produce noise when finishing conversation, and this wireless tranceiver comprises a receiving circuit, and this method comprises: first testing circuit is provided in this wireless tranceiver; During radio signal in this wireless tranceiver receives a scheduled frequency range, use first testing circuit to detect this radio signal and whether belong to a non-standard muted audio signal; And if first testing circuit detects this radio signal and belong to non-standard muted audio signal, then this wireless tranceiver can stop to receive follow-up radio signal.
Another claim of the present invention provides a kind of wireless tranceiver to transmit the method for radio signal, and this wireless tranceiver comprises a talk key, and this method comprises when touching this talk key, uses this wireless tranceiver to export a standard muted audio signal; And when after touching this talk key, decontroling this talk key, use this wireless tranceiver to export a non-standard muted audio signal at scheduled time slot.
Description of drawings
Fig. 1 is the schematic diagram of known continuous audio coding silencing system institute frequency of utilization scope.
Fig. 2 is the function block schematic diagram of known wireless tranceiver.
Fig. 3 is the schematic appearance of wireless tranceiver of the present invention.
Fig. 4 is the functional schematic of wireless tranceiver of the present invention.
Fig. 5 is the sequential chart that transmits of the present invention.
Fig. 6 is the operation workflow figure of wireless tranceiver shown in Figure 4.
Wherein:
10,30,40 wireless tranceivers
11 antennas
12 transceivers, 14 selectors
16,36 processors, 17,44 loud speakers
18,34 microphones, 20 voice signal processing units
32 talk keys, 38 transmitting sets
41 radio receivers
42 options buttons
43 processors, 45 receiving circuits
46 first testing circuits
48 second testing circuits
Embodiment
Please consult Fig. 3, Fig. 4 and Fig. 5 together, Fig. 3 is the schematic appearance of wireless tranceiver 30,40 of the present invention, and Fig. 4 is the functional schematic of wireless tranceiver 30,40, and Fig. 5 is the sequential chart that the present invention transmits.Wireless tranceiver 30 comprises a talk key 32, a microphone 34, a processor 36 and a reflector 38.Wireless tranceiver 40 then comprises a receiver 41, an options button 42, a processor 43, a loud speaker 44, one first testing circuit 46, one second testing circuit 48 and a receiving circuit 45.When beginning to touch talk key 32, the t that is to say at Fig. 5
0Processor 36 can begin received speech signals by control microphone 34, and, produce a standard muted audio signal according to the predefined frequency of user, by reflector 38 standard muted audio signal and this voice signal are sent in conjunction with one default of carrier wave at last.For instance, as shown in Figure 1, because the frequency of general voice signal is between 300Hz～3400Hz, and the frequency of audio signal is between 62.5Hz～250Hz, therefore the audio signal of 38 different frequencies can be distributed between 62.5Hz～250Hz, is P if a user sets the logic channel of its wireless tranceiver 30
1(T
38), that is to say and adopt physical channel P
1Carrier wave, and the 38th audio signal (its frequency is 250Hz) transmitted with this voice signal.When the user decontrols talk key 32 by the time, that is to say the t in Fig. 5
1The time, standard audio signal and voice signal are just no longer along with physical channel P
1Carrier wave continue to send, but just after talk key 32 is decontroled, wireless tranceiver 30 meetings are at a period of time Δ
tAlong with non-standard muted audio signal T of carrier wave output
39, its purpose is described in detail after a while again, and afterwards, wireless tranceiver 30 is again at t
2Press-to-talk key 32 is up to t
3, wireless tranceiver 30 again can be at a period of time Δ subsequently
tAlong with non-standard muted audio signal T of carrier wave output
39Note that non-standard muted audio signal T
39Frequency be within the scope of 62.5Hz～250Hz, but do not comprise the defined frequency of standard muted audio signal, in addition because standard muted audio signal and non-standard muted audio signal belong to same frequency domain, for avoiding erroneous judgement, so during the standard muted audio signal sent, non-standard muted audio signal just can not send in design.
The receiver 41 of wireless tranceiver 40 is used for receiving the radio signal that wireless tranceiver 30 transmits, and in this embodiment, receiver 41 only is set to can receive physical channel P
1Carrier wave.The radio signal that options button 42 is used for allowing the user select whether to judge receiver 41 inputs comprises non-standard muted audio signal T
39, first testing circuit 46 is used for judging whether the radio signal of receiver 41 inputs comprises non-standard muted audio signal T
39, second testing circuit 48 is used for judging whether the radio signal of receiver 41 inputs comprises a predetermined standard muted audio signal, for convenience of description, in this embodiment, the standard muted audio signal T that this is predetermined
38Be 250Hz.Receiving circuit 45 is used for the voice signal in the radio signal is converted to sound wave, and loud speaker 44 is used for exporting sound wave.
See also Fig. 6, Fig. 6 is the operation workflow figure of wireless tranceiver 40 shown in Figure 4.The running of wireless tranceiver 40 includes the following step:
Step 100: beginning;
Step 102: receiver 41 receives and uses physical channel P
1Radio signal;
Step 104: whether options button 42 is selected, if then execution in step 106, if not, then execution in step 108;
Step 106: use first testing circuit 46 to differentiate this radio signal and whether comprise non-standard muted audio signal T
39If,, then execution in step 112, and if not, then execution in step 102;
Step 108: use second testing circuit 48 to differentiate this radio signal and whether comprise standard muted audio signal T
38If,, then execution in step 110, and if not, then execution in step 114;
Step 110: this radio signal is sent to receiving circuit 45 and uses receiving circuit 45 that the voice signal in this radio signal is converted to sound wave, re-use loud speaker 44 these sound waves of output; And
Step 112: finish.
The operating instruction of wireless tranceiver 40 is as follows.When receiving, receiver 41 uses physical channel P
1Radio signal after (step 102), whether processor 43 can be selected (step 104) according to options button 42 and determine whether that the radio signal of judging receiver 41 inputs comprises non-standard muted audio signal T
39If options button 42 is selected, processor 43 can use first testing circuit 46 and second testing circuit 48 to judge whether the radio signal of receiver 41 inputs comprises non-standard muted audio signal T
39And standard muted audio signal T
38For instance, suppose non-standard muted audio signal T
39Frequency be 65Hz (but this frequency does not belong to the frequency of any defined standard muted audio signal), when options button 42 is selected, first testing circuit 46 can judge that whether the radio signal of receiver 41 inputs comprises the radio signal (step 106) of 65Hz, (that is to say Fig. 5 t if detect the 65Hz frequency
1～t
1+ Δ
tAnd t
3～t
3+ Δ
t), the user who then represents wireless tranceiver 30 has decontroled talk key 32, at this moment wireless tranceiver 40 will stop to receive follow-up radio signal, and no longer receive radio signals owing to wireless tranceiver 40 this moment, so loud speaker 44 can not exported the voice signal in the radio signal more yet.If do not detect the signal of 65Hz, represent that then wireless tranceiver 40 still is in holding state and (that is to say Fig. 5 t
1+ Δ
t～t
2), this moment, wireless tranceiver 40 meetings continued to detect radio signal.If options button 42 is not selected, then processor 43 only can use second testing circuit 48 to detect the standard muted audio signal T of 250Hz frequency range
38Whether exist (step 108), if the standard muted audio signal T of 250Hz
38Exist and (that is to say Fig. 5 t
0～t
1And t
2～t
3), then processor 43 can use receiving circuit 45 will be converted to sound wave (step 110) at the voice signal between the frequency 300Hz to 3.4KHz.Last receiving circuit 45 can convert voice signal to sound wave and export loud speaker 44 to so that allow the user of wireless tranceiver 30 can hear the voice of wireless tranceiver 30.
As carrier wave (t among Fig. 5 when talk key 32 is pressed
0～t
1, t
2～t
3), the reflector 38 of wireless tranceiver 30 can transmit the voice signal of input microphone 34 and the audio signal T of 250Hz frequency
38, and when talk key 32 is decontroled the (t among Fig. 5
1～t
1+ Δ
t), the reflector 38 of wireless tranceiver 30 can be at the non-standard muted audio signal T that transmits 65Hz
39The time transmit the voice signal of input microphone 34 because wireless tranceiver 40 is the non-standard muted audio signal T that receive 65Hz at receiving circuit 45
39The time just make receiver 41 stop to receive follow-up radio signal, so the moment that wireless tranceiver 40 is unlikely to when end of conversation produces annoying noise.
In known technology, when end of conversation, the wireless tranceiver of receiving terminal still can receive aerial white noise (white noise) because of being under the accepting state because transmitting terminal does not send carrier wave, and this makes loud speaker produce harsh noise.And wireless tranceiver of the present invention can outwards send the non-standard muted audio signal T of a period of time after unclamping talk key
39The carrier wave of modulation, and receiving terminal is by detecting non-standard muted audio signal T
39And mute speaker.Utilize such method, allow the user when using wireless tranceiver end of conversation of the present invention, loud speaker does not have the generation of noise.
The above only is a most preferred embodiment of the present invention, and every equivalent variations and improvement of making according to claim of the present invention all belongs to the covering scope of patent of the present invention.
Claims (8)
1. method of avoiding a wireless tranceiver when finishing conversation, to produce noise, this wireless tranceiver comprises a receiving circuit, and this method comprises:
One first testing circuit is provided in this wireless tranceiver;
During radio signal in this wireless tranceiver receives a scheduled frequency range, use this first testing circuit to detect this radio signal and whether belong to a non-standard muted audio signal; And
If it is to belong to this non-standard muted audio signal that this first testing circuit detects this radio signal, then this wireless tranceiver stops to receive follow-up radio signal after this radio signal can being reached this receiving circuit.
2. the method for claim 1, wherein this wireless tranceiver comprises one second testing circuit, and this method also comprises:
If it is not to belong to this non-standard muted audio signal that this first testing circuit detects this radio signal, then uses this second testing circuit to detect this radio signal and whether belong to a predetermined standard muted audio signal;
Belong to this predetermined standard muted audio signal if this second testing circuit detects this radio signal, then this radio signal is reached this receiving circuit.
3. the method for claim 1 also comprises an options button is provided; And adjust this options button so that the radio signal in this scheduled frequency range that this wireless tranceiver receives is reached this first testing circuit and detects.
4. the method for claim 1, wherein the frequency of this non-standard muted audio signal is between 62.5Hz～250Hz, but do not comprise the defined frequency of standard muted audio signal.
5. wireless tranceiver of implementing the described method of claim 1.
6. a wireless tranceiver transmits the method for radio signal, and this wireless tranceiver comprises a talk key, and this method comprises:
When touching this talk key, use this wireless tranceiver to export a standard muted audio signal; And
When after touching this talk key, decontroling this talk key, use this wireless tranceiver to export a non-standard muted audio signal at a scheduled time slot.
7. method as claimed in claim 6, wherein the frequency of this non-standard muted audio signal is between 62.5Hz～250Hz, but do not comprise the defined frequency of standard muted audio signal.
8. wireless tranceiver of implementing the described method of claim 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA031250114A CN1543230A (en) | 2003-04-29 | 2003-04-29 | Method for avoiding noise generation in radio interphone at the end of session |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA031250114A CN1543230A (en) | 2003-04-29 | 2003-04-29 | Method for avoiding noise generation in radio interphone at the end of session |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1543230A true CN1543230A (en) | 2004-11-03 |
Family
ID=34321777
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA031250114A Pending CN1543230A (en) | 2003-04-29 | 2003-04-29 | Method for avoiding noise generation in radio interphone at the end of session |
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|---|---|
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108494423A (en) * | 2018-03-09 | 2018-09-04 | 西安蜂语信息科技有限公司 | Source codec method and device |
-
2003
- 2003-04-29 CN CNA031250114A patent/CN1543230A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108494423A (en) * | 2018-03-09 | 2018-09-04 | 西安蜂语信息科技有限公司 | Source codec method and device |
| CN108494423B (en) * | 2018-03-09 | 2021-05-11 | 西安蜂语信息科技有限公司 | Message decoding method and device |
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