CN1735229A - Playback method for give alarm voice - Google Patents

Abstract

The invention relates to a method for playing alarm sounds, which includes mixing the alarm prompt sounds with the codec TC of the calling party, wherein the sound source is not the pre-recorded voice, but according to the frequency, intensity and duration of the alarm signal and other parameters to directly generate digital signals. In the present invention, the two-way and one-way superimposition of the conversation can complete the notification of the alarm signal to both parties or one party of the conversation. By using the method of the invention, resources can be saved; voice quality can be improved; there is no need to record alarm voice files, saving storage space.

Description

A method for playing an alarm sound

technical field

The present invention generally relates to the technology in the third-generation mobile communication network, and particularly relates to a method for sending an alarm prompt tone to the calling party in a network in which MSC (Mobile Switching Center) uses TC (codec) for conversation.

Background technique

In the mobile communication service, there is a PPS service (prepaid service mode), in which the user pre-stores the call charge and can make a call within the time period for which the pre-stored call charge is purchased. For example, the current Shenzhouxing and Ruyitong users are such business models. When the user's call charge is less than one minute of talk time, the system will send a fixed audio warning tone to the user, indicating that the call will be hung up within a certain period of time. When an alarm prompt is sent to the user, the user can still hear the voice of the other party at the same time. In addition, in mobile communication, there are other similar prompt tones that need to be transmitted to the user during a call. The most basic requirement for these alerts is that the user can hear both the alert tone and the other party on the call.

In the prior art, in order to enable the user to hear both the prompt tone and the call tone, it is required to provide a sound mixing function on the device. The MPTY (Multi-Party Talk Service) unit is a voice processing unit for completing multi-party calls on the MSC. In the prior art, the MPTY channel or audio mixing equipment is usually used for audio mixing. The MPTY channel is used as an example to illustrate the principle below, and the principles of other audio mixing equipment are the same.

As shown in Figure 1, in the prior art, if an alarm tone needs to be played to the party on the call, the MSC needs to apply for three MPTY mixing channels first, and connect the two parties to the mixing channel 1 and 2, and then The playback signal is connected to another mixing channel 3, through which the voice is played to the caller.

The disadvantages of this method of prior art are:

1. The MPTY resources of the MSC need to be used, resulting in a decrease in the capacity of MPTY users. MPTY resource should be configured on MSC without MPTY service;

2. When users are connected to conference resources, internal networking operations will occur, which will introduce transient noise and affect call quality;

3. To play the sound source audio file, it needs to be recorded in advance and occupy a certain amount of storage space.

Contents of the invention

The present invention is proposed in order to solve the problems of the above-mentioned prior art, and its purpose is in 3G R99 and 3GR4 TDM network, does not adopt MPTY mixing sound to the simple warning tone, saves MPTY resource, can not configure to the equipment that does not need MPTY service MPTY single board. The present invention is applicable to all switching devices that use TC in calls to solve similar problems, and is not limited to 3G networks. The following only uses 3G networks as an example to introduce.

In order to achieve the above object, the present invention provides a method for sending an alarm prompt tone to the calling party, and the method can be used in a network (such as a 3G TDM core network) in which MSC uses TC to make a call. In the existing 3G TDM core network, MSCs in the end offices are equipped with TCs. Therefore, the method of the present invention includes: when the system warning tone is to be played to the calling party, the MSC directly sends the parameters of the warning tone to the TC used for the conversation; the TC generates a digital signal of a specific warning tone according to the warning tone parameters; The TC directly superimposes the digital signal of the generated alarm tone and the digital signal of the user's call tone, and sends the superimposed voice digital signal to the user who needs to be prompted.

According to the above method of the present invention, the superimposed voice digital signal includes the information of the user's call voice and the system alarm tone. In this way, one party to the call can hear the user's voice and the system alarm tone of the other party. If the digital signal of the specific alarm tone is superimposed on the digital signal of the call tone of both parties in the call, both parties in the call can hear the alarm prompt tone and the voice of the other party.

The method of the present invention has the following advantages: (1) no conference resource mixing is used for the simple alarm prompt tone, which saves conference resources, and no conference resource single board can be configured on the equipment that does not require conference services; (2) directly uses the conference resource The existing TC does not need to use new resources; (3) It is not necessary to connect the two parties to the conference resource during the call, which can improve the voice quality of the call; (4) The alarm voice file does not need to be recorded, and the TC directly Generate its digital signal according to the frequency, intensity, duration, interval, times, etc. of the voice signal.

Description of drawings

FIG. 1 is a schematic diagram of an existing alarm tone playback;

Figure 2 is a schematic diagram of the principle of TC;

Fig. 3 is a schematic diagram of the TC sound mixing process.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings.

As mentioned above, in such as 3G TDM core network, end office MSC is equipped with codec TC, and TC converts AMR (Adaptive Multi-Rate Coding, the voice coding technology used in WCDMA network) compressed voice decoding from mobile phone into The G.711 coded voice used in traditional switches, and convert the G.711 voice sent to the local machine into AMR voice. There is at least one TC in a voice service call. If the calling party and the called party are in the same MSC, there may be two TCs; otherwise, there is only one TC in one MSC. In addition, in other networks, the voice codec may not be AMR, but may be packet G.711 or other mobile or fixed network codecs, which do not affect the use of the present invention, and here only AMR is used as an example to describe the present invention.

Fig. 2 is a schematic diagram of the principle of a conventional TC. Inside TC, there is a PCM linear voice stream between AMR voice and G.711 voice. The PCM code stream is an intermediate form of the two voice formats.

Figure 3 shows an embodiment according to the invention. When the system alarm tone is to be played to one party in the call, in order not to affect the call between users, the MSC directly sends the parameters of the alarm tone to the TC used for the call, and the TC generates a specific alarm tone number according to the alarm tone parameters Signal, within the TC, directly digitally superimpose the digital signal of the played alarm tone and the digital signal of the user's voice, and the superimposed voice digital signal will include the information of the user's voice and the system alarm tone.

For example, China Mobile’s alarm tone parameters are 900 Hz, hold for 200 milliseconds, interval of 2 seconds, duration of 20 seconds, and configurable gain range. Assume that the MSC’s internal number is 0X0001. When one party in the call is insufficient, the MSC An alert tone will be automatically played to the user. In this case, the MSC finds the TC used by the user through the index, and instructs the TC to send a signal numbered 0X0001 to the user. The TC then generates the digital signal of the warning sound according to the direction of the sound and the characteristics of the signal, and superimposes it with the digital signal of the call voice. There are many ways to superimpose two digital signals. The simplest method is direct digital addition. The PCM signal has its maximum value, and the superimposed signal whose digital addition is greater than the maximum value is taken according to the maximum value.

According to the service type, the MSC can instruct the TC to superimpose in the specified direction or in two directions. In this way, if the digital signal of the warning tone is superimposed on the voice digital signal sent to the party who is the object of the warning tone, the calling party will You can hear the voice of the user on the other side and the system alarm tone.

Obviously, if the digital signal of the alarm tone is superimposed on the digital signal of the conversation voice of both parties, both parties can hear the playback and voice.

In addition, the meaning of the warning tone can be set according to needs, such as prompting that one party or both parties in the call have a new incoming call, etc.

The above descriptions of the embodiments of the present invention are only exemplary, and are not intended to limit the present invention. Those skilled in the art can adopt various equivalent substitutions and modifications to the specific details of the above-mentioned embodiments. The essence and protection scope of the present invention are determined only by the claims of this application.

Claims (8)

1. A method for playing warning tone, is characterized in that, comprises the following steps: (1) When the system alarm tone is to be played to the calling party, the MSC directly sends the parameters of the alarm tone to the codec used in the call; (2) The codec generates a digital signal of an alarm tone according to the alarm tone parameters; (3) The codec superimposes the generated alarm tone digital signal and the user's call tone digital signal, and sends the superimposed voice digital signal to the user who needs to be prompted. 2 . The method according to claim 1 , further comprising: when the parameters of the warning sound include frequency, intensity, duration, interval, times, and direction of the warning sound signal. 3. The method according to claim 1 or 2, characterized in that the step (3) comprises: superimposing the warning tone digital signal in a designated call direction. 4. The method according to claim 1 or 2, characterized in that the step (3) comprises: superimposing the warning tone digital signal on both sides of the call. 5 . The method according to claim 3 , characterized in that digital linear superimposition is performed on the alarm tone digital signal and the call voice in the designated call direction. 6 . 6. The method according to claim 5, characterized in that, when the value of the digital linear superposition of the alarm tone digital signal and the call voice in the designated call direction exceeds the maximum value, press the maximum value for the superimposed part exceeding the maximum value. value. 7. The method according to claim 4, characterized in that, digital linear superimposition is performed on the alarm tone digital signal and the call voice. 8. The method according to claim 6, characterized in that, when the digital linear superimposition of the warning tone digital signal and the call voice exceeds a maximum value, the value of the superimposed part exceeding the maximum value is taken as the maximum value.

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