CN1215278A - Method for improving user's front terminal equipment alarm signal audio frequency test - Google Patents
Method for improving user's front terminal equipment alarm signal audio frequency test Download PDFInfo
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- CN1215278A CN1215278A CN 98116117 CN98116117A CN1215278A CN 1215278 A CN1215278 A CN 1215278A CN 98116117 CN98116117 CN 98116117 CN 98116117 A CN98116117 A CN 98116117A CN 1215278 A CN1215278 A CN 1215278A
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Abstract
The method for improving CAS voice-frequency detection is mainly characterized by that when the CAS voice-frequency signal is detected by telephone, only under the condition of speech signal interference of near end subscriber, a small part of CAS voice-frequency signal is detected, and after the small part of CAS voice-frequency signal is detected, the speech signal of said near end subscriber is instantly muted, then the residual CAS voice-frequency signal can be detected, so that under the condition of without speech signal interference of near end subscriber, the telephone can accurately detect the length of said CAS voice-frequency signal, and can determine said CAS voice-frequency signal whether is real and false according to the length depined by specification.
Description
The present invention relates to a kind of new method that in telephone set, detects CAS (user's front terminal equipment alarm signal) audio frequency, mainly be after telephone set detects a bit of CAS audio signal, this near-end (Near End) user's voice signal is covered (mute), under situation about disturbing at the voice that do not have near-end user, measure the length of this CAS audio signal exactly, and according to the defined length of specification, to determine the true and false of this CAS audio signal.
Press, in the employed now various telephone set, except possessing traditional speech communication function, some more newly-designed telephone set still has the ability of data communication, that comparison is typical and commonly used in this data communication facility is calling party identity/calling wait (Caller ID Call Waiting, abbreviation CIDCW) recognition function, this function mainly is that exchange line by telecommunications company is with the telephone number of calling party, information such as name and other messages, be sent on called party's the telephone set, and show by the display on called party's telephone set (as: LCDs), so that the called party is when receiving calls, can learn the identity of calling party by the display on called party's telephone set.
The recognition function of this calling party identity can be subdivided into following two subfunctions again according to called party's telephone set state of living in:
(1) telephone set the called party is under the state of on-hook (on hook), but the function of information such as the telephone number of receipt of call side, be referred to as calling party identity (Caller ID) recognition function, because under this state, called party's telephone set does not use, disturbed by extraneous noise so this telephone set is unlikely,, there is no difficulty so finish the function that receives data smoothly.
(2) called party's telephone set by the state of off-hook (offhook) under, but the function of information such as the phone number of receipt of call side, be referred to as calling wait (Call Wating) recognition function, because under this state, called party's telephone set is in off hook state, promptly be used, therefore, extraneous various noises and user's voice signal all will enter called party's telephone set by microphone, and badly influence the receiving ability of this telephone set to signal, so called party's telephone set is desired under this state, effectively and successfully finish the function that receives data, as if there are many technical difficulties of still needing and overcoming.
Technical, one possesses the telephone set of CIDCW recognition function, before receiving the calling wait data that exchange line transmitted of telecommunications company, receive a CAS audio signal earlier, this signal is mainly in order to notify called party's telephone set, immediately following calling wait data will be arranged behind this signal, therefore, how when telephone set receives the CAS audio signal, telephone set is earlier by carrying out some control action, temporarily to cover the voice signal of coming in by called party's telephone set microphone, make called party's telephone set receive the CAS audio signal like clockwork, promptly become and whether can finish the prerequisite that receives these calling wait data smoothly.After all, can receive the CAS audio signal like clockwork, can guarantee that data are thereafter received reliably.This key of promptly effectively finishing calling wait exists, and also is the difficulty place that the regular phone machine can't effectively overcome technically.
According to the regulation of Britain about CIDCW specification number SIN 242 and SIN 227, the CAS audio signal has the listed parameter characteristic of following table:
| {。##.##1}, | Requirement |
| The low pitch frequency | ????2130Hz+/-0.5％ |
| The high-pitched tone frequency | ????2750Hz+/-0.5％ |
| Received signal level | -14dBm arrives-32dBm |
| Signal stops level | ????-45dBm |
| Twisting | Greatly to 6dBm |
| Signal not | ＜=-7dBmASL (active speech level) near-end speech |
| During this time | 75ms is to 85ms |
| Voice occur | Be |
As seen from the above table, the frequency of CAS audio signal drops within the audiorange, therefore extraneous voice signal is detected as the CAS audio signal most probably by mistake, causing real CAS audio signal may be because of the extraneous voice signal interference of quilt, and can't be detected exactly, this is so-called allergy (Talk-down) and blunt excessively (Talk-off) performance during the CAS audio signal detects.
When telephone set is under the off hook state, the source speech signal in this external world mainly contains two, and one is the voice signal that remote subscriber transmits, and another is the voice signal of near-end user; Wherein because the voice signal of near-end user does not pass through the decay of transmission line, and act directly on the input of CAS audio detection circuit, so this near-end voice signals source is for the irritated of CAS audio signal detection and cross the influence that the passivity the subject of knowledge and the object of knowledge causes, and is especially remarkable.
Press, generally two kinds of methods are adopted in the detection of CAS audio signal, one is for utilizing some custom wafer, Mitel 8843 etc. for example, and another is for utilizing Digital System Processor (Digital Signal Processor is hereinafter to be referred as DSP); The method of wherein utilizing these custom wafer to detect, its advantage is a low price, implement simple, but because these custom wafer itself all do not possess anti-voice interference capability, so the factor that extraneous voice disturb still exists, causing the allergy that the CAS audio signal is detected and reach passivity can be very poor, can not reach the specification requirement of SR-TSV-002476 and the Britain BT of U.S. Bellcore; Review,, realize that the difficulty of this method is very big, and relative cost is also high though utilize the method for Digital System Processor can obtain comparatively ideal allergy and mistake passivity energy.
The present invention is for effectively improving the disappearance of aforementioned conventional CAS audio-frequency detection, mainly be when telephone set detects the CAS audio signal, utilize cheap custom wafer or Digital System Processor (DSP), under the situation of the voice signal interference that near-end user is arranged, detect a bit of CAS audio signal, and after detecting a bit of CAS audio signal, the circuit that covers that utilizes immediately that the regular phone machine all has covers the voice signal of this near-end user, and this custom wafer is detected at remaining CAS audio signal again; So, under the situation of the voice signal interference that does not have near-end user, telephone set can be measured the length of this CAS audio signal accurately, and according to the defined length of specification, determine the true and false of this CAS audio signal, make the irritated of telephone set detection CAS audio signal and cross passivity energy, the specification requirement that all can cross Bellcoregn BT basically.
Fig. 1 improves the hardware configuration schematic diagram of the embodiment of CAS audio signal detection for realization for the present invention;
Fig. 2 detects the sequential schematic diagram of CAS audio signal in this embodiment for the present invention;
Fig. 3 is a system flow schematic diagram of the present invention;
Fig. 4 is the waveform schematic diagram of the CAS audio signal at A point place among the present invention this embodiment shown in Figure 1;
Fig. 5 is the waveform schematic diagram of the extraneous voice interference signal at B point place among the present invention embodiment shown in Figure 1.
The present invention is directed to general in order to detect the custom wafer of CAS audio signal, when measuring the CAS audio signal, by capturing useful signal to confirming as the CAS audio signal, all need a period of time, in during this period of time, the interference of extraneous voice signal exists always, if so can be when this custom wafer be confirmed the period of CAS audio signal, the interference of near-end voice signals given covering, to carry out the affirmation of the CAS audio signal true and false, then getting rid of in the situation that near-end speech disturbs, but should Effective Raise detecting the accuracy of CAS audio signal.
Press, in general telephone set, be equipped with voice and cover circuit, with under the situation of DTMF (touch-tone signal) dialing and reception FSK (keying frequency displacement) signal etc., the voice signal of near-end is covered, to avoid that the voice signal of far-end in the telephone set is caused interference.
Method of the present invention promptly utilizes these voice to cover circuit, in custom wafer is confirmed the time of CAS audio signal, cover the voice signal of near-end, to get rid of the interference of near-end voice signals, interference as for far-end speech signal, because less relatively, it is also less to cause that the CAS audio signal detects irritated and blunt excessively chance.Because, the present invention is in the interference phenomenon of fundamentally having eliminated near-end voice signals, not only effective to the custom wafer that does not have anti-voice interference performance, the Digital System Processor (DSP) that itself promptly has anti-voice interference performance is also had to a certain degree effectiveness, detect the irritated of CAS audio frequency and cross the passivity energy so method of the present invention really can effectively improve.
Now for can more clearly express design concept of the present invention and technical characterictic, the spy enumerates a preferred embodiment, and conjunction with figs., is described in detail as follows:
In an embodiment of the present invention, be to detect the CAS audio signal with a custom wafer (can be the custom wafer of a numbering Mitel 8843), its block hardware diagram as shown in Figure 1, wherein voice cover circuit 103 and are mainly used to cover the voice signal that is entered this custom wafer 102 by microphone 105.The CAS audio signal output end of this custom wafer 102 (CAS out) is received main control unit (Main Control Unit, hereinafter to be referred as MCU) on 101 the external interrupt, in case the CAS audio signal input end of custom wafer 102 (CAS in) is when detecting the CAS audio signal, just can trigger this MCU 101 and produce an interrupt signal in good time, and this interrupt signal of mat is controlled these voice and is covered circuit 103 and cover action, to cover the voice signal of the near-end that enters by microphone 105, get rid of the interference of near-end voice signals, then, this MCU101 judges the sequential of removing the effective CAS audio signal after disturbing again.
Consult shown in Figure 2, Fig. 2 is the detected CAS audio signal of a present embodiment sequential schematic diagram, wherein importing custom wafer 102 preceding CAS audio signal sequential length overalls is T4, specification definition according to aforementioned Bellcore, the T4 value is in 75ms arrives the scope of 85ms, and in the CAS audio signal sequential of these custom wafer 102 outputs, T1 is the front end acknowledging time of this custom wafer 102, promptly confirm the time that the CAS audio signal begins, this time is determined by hardware circuit, and its use value is 10ms in the present embodiment, and T3 is the rear end acknowledging time of this custom wafer 102, promptly confirm the time that the CAS audio signal finishes, this time, also by the hardware circuit decision, its use value was 5ms in the present embodiment, and T2 is the software certification time, by learning T2=T4-T1 among the figure, should be 65ms in the scope of 75ms.
When the present invention measures CAS audio signal length at this MCU101, in fact measured value should be T2+T3, because of MCU101 is sayed, in the T3 time range, the CAS audio signal still is effectively output, and therefore, the MCU101 measured value should be at 70ms in the time range of 80ms, that is in this time range measured CAS audio signal, all can be considered to real CAS audio signal.
Consult shown in Figure 3, Fig. 3 is a system flow schematic diagram of the present invention, wherein Tm represents the time of actual measurement CAS audio signal, when MCU101 receives the CAS audio signal of custom wafer 102 outputs, promptly produce an interrupt signal, and this interrupt signal of mat is controlled these voice and is covered circuit 103, to cover the voice signal that enters custom wafer 102 by microphone 105, MCU101 is under the situation that does not have near-end voice signals to disturb then, continue to check validity by the CAS audio signal of custom wafer 102 outputs, and the duration T m of calculating CAS audio signal, if Tm is in 70ms arrives the scope of 80ms, think that then measured signal is genuine CAS audio signal, otherwise, promptly think false CAS audio signal, last, mat is removed the action of covering that these voice cover circuit 103 again, makes user's near-end voice signals be able to continue to enter custom wafer 102 by microphone 105.
Consult shown in Figure 1 again, the CAS audio signal that receives from telephone wire wherein, its oscillogram as shown in Figure 4, the signal at B point place is extraneous voice interference signal, its oscillogram as shown in Figure 5, A point place is CAS audio signal and the mixed signal of voice signal, but after these voice cover circuit 103 and are activated, the signal at A point place also only is the CAS audio signal, at this moment, custom wafer 102 received signals disturb for no voice and simple effectively CAS audio signal, therefore, only need significantly to improve the detection accuracy of custom wafer 102 by excluding the voice interference signal that transmits by B point place.
Hence one can see that, in this embodiment of the invention, this custom wafer 102 is when detecting the CAS audio signal, only detect CAS audio signal and voice signal in the time simultaneously at T1 (10ms), and in follow-up detection time, then under the situation that does not have voice signal interference fully, detect the CAS audio signal, therefore, should obtain splendid allergy and cross the passivity energy for the detection of CAS audio signal.
The above; be preferred embodiment of the present invention; but the interest field that the present invention advocated is not limited thereto; in every case be familiar with this technology personage; according to the disclosed technology contents of the present invention, can think easily and equivalence change, as: cooperate method of the present invention; adopt the method for other custom wafer or employing DSP, all should belong to and not break away from protection category of the present invention.
Claims (5)
1. method of improving the CAS audio detection, it is characterized in that, this method is when telephone set detects the CAS audio signal, utilize a custom wafer or Digital System Processor, under the situation of the voice signal interference that near-end user is arranged, detect a bit of CAS audio signal, and after detecting a bit of CAS audio signal, utilize the circuit that covers of telephone set that the voice signal of this near-end user is covered immediately, this custom wafer is detected at remaining CAS audio signal again; So, under the situation of the voice signal interference that does not have near-end user, telephone set can be measured the length of this CAS audio signal exactly, and according to the defined length of specification, determine the true and false of this CAS audio signal, make the irritated of telephone set detection CAS audio signal and cross the passivity energy, all can reach specification requirement basically.
2. the method for improving the CAS audio detection as claimed in claim 1, it is characterized in that, the CAS audio signal output end of this custom wafer is received on the external interrupt of main control unit, when making the CAS audio signal input end of this custom wafer detect the CAS audio signal, trigger this main control unit and produce an interrupt signal in good time, and this interrupt signal of mat is controlled these voice and is covered circuit and cover action, to cover the voice signal that enters near-end by microphone, get rid of the interference of near-end voice signals, then, this main control unit is judged the sequential of removing the effective CAS audio signal after disturbing again.
3. the method for improving the CAS audio detection as claimed in claim 1 or 2, it is characterized in that, importing the preceding CAS audio signal sequential length overall of this custom wafer is T4, in the CAS audio signal sequential of this custom wafer output, the front end acknowledging time of this custom wafer is T1, promptly confirm the time that the CAS audio signal begins, this time is determined by hardware circuit, the rear end acknowledging time of this custom wafer is T3, promptly confirm the time that the CAS audio signal finishes, this time, also by the hardware circuit decision, its software certification time then was T2, wherein T2=T4-T1; When this MCU measured CAS audio signal length, measured value in fact should be in the time range of T2+T3, that is in this time range measured CAS audio signal, all can be considered to true CAS audio signal.
4. the method for improving the CAS audio detection as claimed in claim 3, it is characterized in that, when MCU receives the CAS audio signal of this custom wafer output, promptly produce an interrupt signal, and this interrupt signal of mat is controlled these voice and is covered circuit, to cover the voice signal that enters this custom wafer by microphone, this main control unit is under the situation that does not have far-end speech signal to disturb then, continue to check validity by the CAS audio signal of this custom wafer output, and the duration T m of calculating CAS audio signal, if Tm in the scope of T2+T3, thinks that then measured signal is genuine CAS audio signal, otherwise, promptly think false CAS audio signal, at last, mat is removed the action of covering that these voice cover circuit again, makes user's near-end voice signals be able to continue to enter this custom wafer by microphone.
5. the method for improving the CAS audio detection as claimed in claim 3 is characterized in that, this T4 value is according to the specification definition of Bellcore, in 75ms arrives the scope of 85ms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98116117 CN1215278A (en) | 1998-07-16 | 1998-07-16 | Method for improving user's front terminal equipment alarm signal audio frequency test |
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| CN 98116117 CN1215278A (en) | 1998-07-16 | 1998-07-16 | Method for improving user's front terminal equipment alarm signal audio frequency test |
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| CN1215278A true CN1215278A (en) | 1999-04-28 |
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| CN 98116117 Pending CN1215278A (en) | 1998-07-16 | 1998-07-16 | Method for improving user's front terminal equipment alarm signal audio frequency test |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102684918A (en) * | 2012-05-04 | 2012-09-19 | 武汉日电光通信工业有限公司 | System and method for alarm analysis based on DTMF (dual-tone multi-frequency) audio integrated network management |
| CN114040312A (en) * | 2021-11-29 | 2022-02-11 | 四川虹美智能科技有限公司 | Microphone detection method and system of voice air conditioner |
-
1998
- 1998-07-16 CN CN 98116117 patent/CN1215278A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102684918A (en) * | 2012-05-04 | 2012-09-19 | 武汉日电光通信工业有限公司 | System and method for alarm analysis based on DTMF (dual-tone multi-frequency) audio integrated network management |
| CN114040312A (en) * | 2021-11-29 | 2022-02-11 | 四川虹美智能科技有限公司 | Microphone detection method and system of voice air conditioner |
| CN114040312B (en) * | 2021-11-29 | 2023-08-22 | 四川虹美智能科技有限公司 | Microphone detection method and system of voice air conditioner |
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