CN103165139B - Method and device for detecting figure infra-acoustic frequency signals - Google Patents
Method and device for detecting figure infra-acoustic frequency signals Download PDFInfo
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- CN103165139B CN103165139B CN201110407894.2A CN201110407894A CN103165139B CN 103165139 B CN103165139 B CN 103165139B CN 201110407894 A CN201110407894 A CN 201110407894A CN 103165139 B CN103165139 B CN 103165139B
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Abstract
The invention discloses a method and a device for detecting figure infra-acoustic frequency signals. The method comprises: A. signals in an infra-acoustic frequency segment can be acquired form received signals; B. the signals in the infra-acoustic frequency segment can be in hard decision to obtain an objective sequence; C. the obtained objective sequence and a preinstalled figure infra-acoustic frequency sequence can be compared; D. when the objective sequence and the preinstalled figure infra-acoustic frequency sequence are identical and different in digits to satisfy a setting scope, the figure infra-acoustic frequency signals are ensured to be detected. In a detective process, the setting scope is used and a gray coding process can be omitted so as to effectively reduce calculated amount and simply the detective process. Furthermore, polarity of signals of a sending side and a receiving side can be taken into consideration. Therefore, the method and the device for detecting figure infra-acoustic frequency signals can be applied to rapidly and accurately to detect the figure infra-acoustic frequency signals so that a squelch circuit can be normally guaranteed to be opened and closed.
Description
Technical field
The present invention relates to intercom field, particularly a kind of method and device detecting digital subaudio frequency signal.
Background technology
In the process utilizing intercom transmission of audio signal, mutually disturb between different user, adopt and a kind of frequency is attached to lower than the signal of audio frequency the code identification signaling technology transmitted together in sound signal, be called infrasonic technology, the frequency of additional signal, lower than audio frequency, is called sub-audio signal.Launch party launches through the sound signal of ovennodulation and sub-audio signal simultaneously; The signal that take over party's demodulation receives, is then detected whether there is sub-audio signal, if sub-audio signal detected, then opens squelch circuit, output audio signal, sounded by loudspeaker.
Infrasonic technology is divided into two kinds, and one is simulation infrasonic technology, and another kind is digital subaudio frequency technology, and the sub-audio signal in digital subaudio frequency technology carries out the digital signal of encoding with digital encoding scheme, is called digital subaudio frequency signal.At present, digital subaudio frequency signal comprises 23, and as shown in Figure 1,1st ~ 9 is data bit; 10th ~ 12 is zone bit, is fixed as 001; 13rd ~ 23 is check bit, adopts Gray code.
Fig. 2 is the schematic diagram of the method detecting digital subaudio frequency signal in prior art, shown in Figure 2, and the method detecting digital subaudio frequency signal in prior art comprises following step:
Step 201: carry out low-pass filtering to received signal, obtains the signal in subsonics frequency range.
Step 202: carry out hard decision and Gray's decoding successively to the signal in described subsonics frequency range, obtains coding sequence.
Step 203: judge whether the coding sequence 10th ~ 12 obtained is 001, if so, then performs step 204, otherwise performs step 201.
Step 204: judge that whether the coding sequence obtained is identical with preset digital subaudio frequency sequence, if so, then performs step 205, otherwise, perform step 206.
Step 205: open squelch circuit.
Step 206: carry out ring shift to former coding sequence, obtains the coding sequence after upgrading.
Step 207: judge whether ring shift number of times is greater than 22 times, if so, then performs step 201, otherwise, perform step 204.
When utilizing the method shown in Fig. 2 to detect digital subaudio frequency signal, carried out Gray's decoding, calculated amount is larger; In addition, if signal is squeezed, the polarity of launch party and take over party's signal is contrary, so digital subaudio frequency signal cannot be detected, thus normally can not open squelch circuit.
Summary of the invention
The embodiment of the present invention provides a kind of method and the device that detect digital subaudio frequency signal, in order to digital subaudio frequency signal fast and accurately to be detected.
A kind of method detecting digital subaudio frequency signal that the embodiment of the present invention provides comprises:
A, the signal obtained from Received signal strength in subsonics frequency range;
B, hard decision is carried out to the signal in described subsonics frequency range, obtain a target sequence;
C, by the target sequence of acquisition compared with preset digital subaudio frequency sequence;
If the figure place that the described target sequence of D is identical or not identical with preset digital subaudio frequency sequence meets setting range, then determine digital subaudio frequency signal to be detected.
A kind of device detecting digital subaudio frequency signal that the embodiment of the present invention provides comprises:
Acquisition module, for obtaining the signal in subsonics frequency range from Received signal strength;
Hard decision module, carries out hard decision for the signal in the subsonics frequency range that obtains described acquisition module, obtains a target sequence;
Comparison module, for by the target sequence of acquisition compared with preset digital subaudio frequency sequence;
Determination module, when meeting setting range for the figure place identical or not identical with preset digital subaudio frequency sequence at described target sequence, determines digital subaudio frequency signal to be detected.
As seen through the above technical solutions, in embodiments of the present invention, when detecting digital subaudio frequency signal, from Received signal strength, the signal in subsonics frequency range is obtained; Hard decision is carried out to the signal in described subsonics frequency range, obtains a target sequence; By the target sequence of acquisition compared with preset digital subaudio frequency sequence; If the figure place that described target sequence is identical or not identical with preset digital subaudio frequency sequence meets setting range, then determine digital subaudio frequency signal to be detected.In the process detected, utilize a setting range, omit Gray's decode procedure, effectively reduce calculated amount, simplify testing process, and, if the described target sequence figure place identical with preset digital subaudio frequency sequence meets setting range, then show that launch party is identical with the polarity of take over party's signal; If the figure place that described target sequence is not identical with preset digital subaudio frequency sequence meets setting range, then show that launch party is different from the polarity of take over party's signal, no matter whether launch party is identical with the polarity of take over party's signal, digital subaudio frequency signal can be detected.Therefore, the embodiment of the present invention can fast and accurately detect digital subaudio frequency signal, thus ensures normally to open squelch circuit.
Accompanying drawing explanation
Fig. 1 is the composition schematic diagram of digital subaudio frequency signal in prior art;
Fig. 2 is the schematic diagram of the method detecting digital subaudio frequency signal in prior art;
Fig. 3 is the schematic flow sheet of a specific embodiment of the inventive method;
Fig. 4 is the schematic flow sheet of another specific embodiment of the inventive method;
Fig. 5 is the structural representation of apparatus of the present invention embodiment.
Embodiment
In embodiments of the present invention, consider that launch party may not be identical with the polarity of take over party's signal, therefore, when detecting digital subaudio frequency signal, after signal to received signal in the audio section of the Central Asia carries out hard decision, the sequence obtained by hard decision is directly compared with preset digital subaudio frequency sequence, if identical or not identical figure place meets setting range, then determines digital subaudio frequency signal to be detected.
Below in conjunction with accompanying drawing, the inventive method embodiment is described in detail.
Fig. 3 is the schematic flow sheet of a specific embodiment of the inventive method.
Described in Fig. 3, a kind of method detecting digital subaudio frequency signal that the embodiment of the present invention provides comprises following step:
Step 301: obtain the signal in subsonics frequency range from Received signal strength.
Step 302: hard decision is carried out to the signal in described subsonics frequency range, obtains a target sequence.
Here, when hard decision is carried out to the signal in described subsonics frequency range, if signal is greater than or equal to zero, be then judged to " 1 ", if signal is less than zero, be then judged to " 0 ".
Step 303: by the target sequence of acquisition compared with preset digital subaudio frequency sequence.
Here, described target sequence and preset digital subaudio frequency sequence all comprise 23 bits, and when comparing, 23 bit one_to_one corresponding are compared.
Step 304: if the described target sequence figure place identical or not identical with preset digital subaudio frequency sequence meets setting range, then determine digital subaudio frequency signal to be detected.
Here, preferably, described setting range comprises and is greater than or equal to 20.
Fig. 4 is the schematic flow sheet of another specific embodiment of the inventive method.
Shown in Figure 4, a kind of method detecting digital subaudio frequency signal that the embodiment of the present invention provides comprises following step:
Step 401: carry out low-pass filtering to received signal, obtains the signal in subsonics frequency range.
Step 402: hard decision is carried out to the signal in described subsonics frequency range, obtains a target sequence.
Step 403: judge whether the figure place that the target sequence of acquisition is identical or not identical with preset digital subaudio frequency sequence meets setting range, if so, then performs step 404, otherwise, perform step 405.
Here, if judge that the figure place that the target sequence of acquisition is identical with preset digital subaudio frequency sequence meets setting range, then show that launch party is identical with the polarity of take over party's signal; If judge that the figure place that the target sequence of acquisition is not identical with preset digital subaudio frequency sequence meets setting range, then show that launch party is not identical with the polarity of take over party's signal.Now, no matter whether launch party is identical with the polarity of take over party's signal, according to above-mentioned steps, digital subaudio frequency signal can be detected.Preferably, described setting range comprises and is greater than or equal to 20.
Step 404: determine digital subaudio frequency signal to be detected, opens squelch circuit.
Step 405: judge whether ring shift number of times is less than set point number, if so, then performs step 406, otherwise, perform step 401.
Here, target sequence to be detected only has 23, and therefore, preferably, described set point number comprises 22 times.
Step 406: former target sequence is carried out ring shift, obtains the target sequence after upgrading, returns step 403.
Fig. 5 is the structural representation of apparatus of the present invention embodiment.
Shown in Figure 5, a kind of device detecting digital subaudio frequency signal that the embodiment of the present invention provides comprises:
Acquisition module 51, for obtaining the signal in subsonics frequency range from Received signal strength;
Hard decision module 52, carries out hard decision for the signal in the subsonics frequency range to described acquisition module 51 acquisition, obtains a target sequence;
Comparison module 53, for by the target sequence of acquisition compared with preset digital subaudio frequency sequence;
Determination module 54, when meeting setting range for the figure place identical or not identical with preset digital subaudio frequency sequence at described target sequence, determines digital subaudio frequency signal to be detected.
This device also comprises further:
Circular shift module, setting range is not met for the figure place identical or not identical with preset digital subaudio frequency sequence at described target sequence, and ring shift number of times is when being less than set point number, described target sequence is carried out ring shift, obtain the target sequence after upgrading, return described comparison module 53.
Preferably, described setting range comprises and is greater than or equal to 20, and described set point number comprises 22 times.
As seen through the above technical solutions, in embodiments of the present invention, when detecting digital subaudio frequency signal, from Received signal strength, the signal in subsonics frequency range is obtained; Hard decision is carried out to the signal in described subsonics frequency range, obtains a target sequence; By the target sequence of acquisition compared with preset digital subaudio frequency sequence; If the figure place that described target sequence is identical or not identical with preset digital subaudio frequency sequence meets setting range, then determine digital subaudio frequency signal to be detected.In the process detected, utilize a setting range, omit Gray's decode procedure, effectively reduce calculated amount, simplify testing process, and, if the described target sequence figure place identical with preset digital subaudio frequency sequence meets setting range, then show that launch party is identical with the polarity of take over party's signal; If the figure place that described target sequence is not identical with preset digital subaudio frequency sequence meets setting range, then show that launch party is different from the polarity of take over party's signal, no matter whether launch party is identical with the polarity of take over party's signal, digital subaudio frequency signal can be detected.Therefore, the embodiment of the present invention can fast and accurately detect digital subaudio frequency signal, thus ensures normally to open squelch circuit.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if belong within the scope of the claims in the present invention and equivalent technologies thereof to these amendments of the present invention and modification, then the present invention is also intended to comprise these change and modification.
Claims (8)
1. detect a method for digital subaudio frequency signal, it is characterized in that, the method comprises:
A, the signal obtained from Received signal strength in subsonics frequency range;
B, hard decision is carried out to the signal in described subsonics frequency range, obtain a target sequence;
C, by the target sequence of acquisition compared with preset digital subaudio frequency sequence;
If the figure place that the described target sequence of D is identical or not identical with preset digital subaudio frequency sequence meets setting range, then determine digital subaudio frequency signal to be detected;
Wherein, described target sequence and described preset digital subaudio frequency sequence comprise identical bit, and when comparing, each bit one_to_one corresponding is compared.
2. the method for claim 1, is characterized in that, the method also comprises further:
If the figure place that the described target sequence of E is identical or not identical with preset digital subaudio frequency sequence does not meet setting range, and ring shift number of times is less than set point number, then described target sequence is carried out ring shift, obtain the target sequence after upgrading, return step C.
3. method as claimed in claim 1 or 2, it is characterized in that, described setting range comprises and is greater than or equal to 20.
4. method as claimed in claim 2, it is characterized in that, described set point number comprises 22 times.
5. detect a device for digital subaudio frequency signal, it is characterized in that, this device comprises:
Acquisition module, for obtaining the signal in subsonics frequency range from Received signal strength;
Hard decision module, carries out hard decision for the signal in the subsonics frequency range that obtains described acquisition module, obtains a target sequence;
Comparison module, for by the target sequence of acquisition compared with preset digital subaudio frequency sequence;
Determination module, when meeting setting range for the figure place identical or not identical with preset digital subaudio frequency sequence at described target sequence, determines digital subaudio frequency signal to be detected;
Wherein, described target sequence and described preset digital subaudio frequency sequence comprise identical bit, and when comparing, each bit one_to_one corresponding is compared.
6. device as claimed in claim 5, it is characterized in that, this device also comprises further:
Circular shift module, setting range is not met for the figure place identical or not identical with preset digital subaudio frequency sequence at described target sequence, and ring shift number of times is when being less than set point number, described target sequence is carried out ring shift, obtain the target sequence after upgrading, return described comparison module.
7. the device as described in claim 5 or 6, is characterized in that, described setting range comprises and is greater than or equal to 20.
8. device as claimed in claim 6, it is characterized in that, described set point number comprises 22 times.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110407894.2A CN103165139B (en) | 2011-12-08 | 2011-12-08 | Method and device for detecting figure infra-acoustic frequency signals |
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| CN201110407894.2A CN103165139B (en) | 2011-12-08 | 2011-12-08 | Method and device for detecting figure infra-acoustic frequency signals |
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| CN103165139A CN103165139A (en) | 2013-06-19 |
| CN103165139B true CN103165139B (en) | 2015-06-17 |
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| CN103441821B (en) * | 2013-09-03 | 2016-08-17 | 天津七一二通信广播有限公司 | A kind of digital subaudio frequency weak signal processing method |
| CN108365853B (en) * | 2018-01-26 | 2019-09-27 | 深圳科立讯通信有限公司 | Assist squelch control method, talk back equipment and computer readable storage medium |
Citations (4)
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|---|---|---|---|---|
| CN1642027A (en) * | 2005-01-04 | 2005-07-20 | 华南理工大学 | 400M common frequency range digital intercom and method for realizing said communication |
| JP2009246430A (en) * | 2008-03-28 | 2009-10-22 | Kenwood Corp | Radio communication device and method of processing radio communication device |
| GB2459934A (en) * | 2008-05-16 | 2009-11-18 | Zycomm Electronics Ltd | Use of ctcss in a trunked radio system |
| JP2011176842A (en) * | 2011-03-18 | 2011-09-08 | Kenwood Corp | Signal detection apparatus, radio apparatus, and signal detection method |
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| US6816070B1 (en) * | 2003-04-22 | 2004-11-09 | Conwise Technology Corporation Ltd. | Method of generating an alert for walkie-talkie when out of communicatable distance |
| US20060121896A1 (en) * | 2004-12-08 | 2006-06-08 | Tin Lee W | Method for user identification in a CTCSS based radio communication system |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1642027A (en) * | 2005-01-04 | 2005-07-20 | 华南理工大学 | 400M common frequency range digital intercom and method for realizing said communication |
| JP2009246430A (en) * | 2008-03-28 | 2009-10-22 | Kenwood Corp | Radio communication device and method of processing radio communication device |
| GB2459934A (en) * | 2008-05-16 | 2009-11-18 | Zycomm Electronics Ltd | Use of ctcss in a trunked radio system |
| JP2011176842A (en) * | 2011-03-18 | 2011-09-08 | Kenwood Corp | Signal detection apparatus, radio apparatus, and signal detection method |
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