• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
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    • 专利摘要:
    PURPOSE: A method for calling a multi-party conference through a digital signal process in an exchange system, is provided, that a signal processor processes audio signals inputted from each subscriber channel into digital, so that incoming of noise can be prevented, and subscribers can be expanded, CONSTITUTION: A method for calling a multi-party conference through a digital signal process in an exchange system, having a signal processor, comprises the steps of: testing whether a present exchange system is in a conference call, when an exchange system subscriber inputs a key for a conference call function; inputting continuously variable slope delta modulation(CVSD) data transmitted from each subscriber channel, setup a multi-party conference call mode, the exchange system is not in the conference call presently; converting into PCM data, decoding the CVSD data; summing the PCM data into each different subscribers; and transmitting to subscriber channel, encoding the CVSD data again.
    公开号:KR20000044346A
    申请号:KR1019980060843
    申请日:1998-12-30
    公开日:2000-07-15
    发明作者:권진현；김태완；박병욱
    申请人:박태진；삼성톰슨시에스에프 주식회사；
    IPC主号:
    专利说明:

    Multi-party conference call method through digital signal processing in exchange system.
    The present invention relates to an exchange system, and more particularly, to a multi-party conference call method through digital signal processing in an exchange system.
    Nowadays, most companies and offices have private exchanges installed and operated. Examples of such private exchanges include 'Private Branch Exchanger (PABX)' and 'Keyphone System'. The role of the private exchange is largely a role of connecting a call between a trunk line and an extension subscriber by a telephone line (commonly referred to as a trunk line) of a premises switching facility and an affiliated transfer handling section.
    Meanwhile, a conference call function (Conference) is usually implemented and performed in the private exchange as described above. The conference group is configured with a capacity set in advance in the private exchange, and a predetermined number of subscribers in each group use their terminal in the conference. It refers to the ability to participate and make calls with each other. In other words, participants in a meeting group can hear all their voices together, and can deliver their voices to all participants at any time. This conferencing function has brought the convenience to the subscribers, which allows the private exchange subscribers to meet with each other via a telephone terminal when they cannot gather in one place.
    1 is a block diagram of a conference call apparatus provided for a conference call function in a conventional exchange system. Referring to FIG. 2, the conference call device includes a plurality of CVSD decoders 100, 102, 104, OP amplifiers 106, 108, 110, and CVSD encoders 112, 114, and 116. The CVSD decoders 100, 102, and 104 decode CVSD data input from a plurality of subscriber channels, convert them into analog signals, and output them. The CVSD data refers to data in which a voice signal input from each subscriber is digitally modulated in a CVSD manner through a plurality of telephones connected to the conference call device. The OP amplifiers 106, 108, and 110 add and amplify analog signals output from the CVSD decoders 100, 102, and 104 and output them. The CVSD encoders 112, 114, and 116 convert the analog signals added and amplified from the OP amplifiers 106, 108, and 110 into CVSD data and transmit the converted analog signals to corresponding subscriber channels. That is, the conventional conference call apparatus converts CVSD data transmitted from a plurality of subscriber channels into analog signals, adds and amplifies them through an OP amplifier, and then encodes and adds the added amplified analog voice signals to CVSD data.
    However, in the conventional conference call device as described above, since the signal transmitted to each part is an analog signal, noise is easily introduced during the signal transmission process, and when the subscriber extension is required, the CVSD decoder, the CVSD encoder, etc. are expanded in hardware. There is a problem in that the circuit is complicated because the additional number of subscribers to be provided.
    As described above, in the conventional conference call device, since the signal transmitted to each part is an analog signal, noise is easily introduced during the signal transmission process, and when the subscriber extension is necessary, the CVSD decoder, the CVSD encoder, etc. Since the number of additional subscribers must be additionally provided, the circuit becomes complicated.
    Accordingly, an object of the present invention is to provide a multi-party conference call method of an exchange system that has no influence of noise during signal processing for a conference call function and facilitates subscriber extension.
    1 is a block diagram of a conference conference apparatus of a conventional exchange system;
    2 is a functional block diagram of a signal processing unit for performing signal processing for a multi-party conference call function according to an embodiment of the present invention;
    3 is a flowchart illustrating a signal processing unit for a multi-party conference call function according to an exemplary embodiment of the present invention.
    The present invention for achieving the above object is a multi-party conference call method in a switching system having a signal processing unit for performing a signal processing for a conference call function, there is a key input for the conference call function from the subscriber of the exchange system In response to this, a process of checking whether the switching system is currently in a conference call, and if the switching system is not currently in a conference call, setting the conference conference mode to input CVSD data transmitted from each subscriber channel. A process of decoding CVSD data from each inputted subscriber channel into PCM data, summing up each subscriber's PCM data by different subscribers, and then encoding the CVSD data and encoding the corresponding subscriber channel again. Characterized by the configuration including the process to transmit to.
    Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Many specific details are set forth in the following description and in the accompanying drawings to provide a more general understanding of the invention. It will be apparent to those skilled in the art that the present invention may be practiced without these specific details. And a detailed description of known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted.
    FIG. 2 illustrates a software functional block diagram of a signal processing unit for processing a multi-party conference function in a digital signal processor (DSP) in an exchange system according to an embodiment of the present invention. Referring to FIG. 2, the signal processor 200 includes software function blocks of the CVSD decoders 200, 204, 206, the adders 208, 210, and 212, and the CVSD encoders 214, 216, and 218. After converting to, the digital PCM data is signal-processed in the signal processor 200. Therefore, the inflow of noise due to the processing of the conventional analog signal is prevented, and the signal processing is done by software to facilitate the expansion of subscribers.
    3 is a flowchart illustrating a signal processing unit performing signal processing for a multi-party conference function according to an exemplary embodiment of the present invention. Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. 2 and 3.
    The signal processor 200 has three interrupt modes INT0, INT1, and INT2 for the conference call function. The INT0 interrupt mode is used as an interrupt for notifying the start and end of the conference call, and the INT1 interrupt mode is used as an interrupt for decoding, adding, and encoding CVSD data input to the signal processor 200 from the outside. INT2 is also used as an interrupt for outputting the CVSD data processed in the signal processing unit 200.
    First, the private exchange subscriber enters a predetermined key on the telephone to perform the conference call function. Accordingly, the INT0 interrupt is generated according to the input of the key for the conference call function from the subscriber and applied to the signal processor 200. Then, the signal processing unit 200 proceeds to step 302 in response to the INT0 interrupt in step 300 to check whether a conference call function is currently being performed between subscribers of the exchange. At this time, if the conference call is not currently being performed between subscribers, the signal processing unit 200 proceeds to step 304 to set the conference call mode, and the memory of the memory provided in the signal processing unit 200 (not shown). Set the conference call flag to "1" in the predetermined schedule area. The conference call flag indicates whether the exchange system is currently in a conference call. According to an embodiment of the present invention, when the conference call flag is "1", the conference call flag indicates that the conference call flag is not a conference call. It was. Subsequently, the signal processing unit 200 proceeds to step 306 to enable the INT1 and INT2 interrupts, and responds to the INT1 interrupt in step 308 from each subscriber channel according to the conference call in step 310. Read the input CVSD data. The signal processing unit 200 proceeds to step 312 to decode the input CVSD data into digital PCM data, and proceeds to step 314 to add PCM data of each subscriber channel. In this case, for example, when a private exchange system supports a conference call between three subscribers, the sum of the PCM data sums the PCM data 220 and 222 of the first and second subscriber channels, and the first and the third. The PCM data 220 and 224 of the subscriber channel are added together, and the PCM data 222 and 224 of the second and third subscriber channels are added together to transmit voice signals of two different subscribers to the other subscriber. In operation 316, the signal processor 200 encodes PCM data obtained by adding PCM data of two different subscribers, and converts the PCM data into CVSD data. In step 318, the signal processing unit 200 proceeds to step 320 in response to the INT2 interrupt, and outputs the decoded CVSD data to the corresponding subscriber channel. Accordingly, each subscriber can listen to the voice signals of two different subscribers through the telephone, so that the conference call can be conducted using the telephone. If the subscriber wishes to terminate the conference call later, the conference call ends. In order to input a predetermined key to the phone. Accordingly, the INT0 interrupt is generated again according to the input of the key for terminating the conference call function from the subscriber and applied to the signal processor 200. The signal processing unit 200 then returns to step 302 in response to the INT0 interrupt re-occurrence in step 322 and checks the conference call flag to check again whether the exchange system is currently in a conference call. At this time, if the conference call flag is set to '1', that is, if the current exchange system recognizes that the conference call is in a multi-party conference call, the signal processing unit 200 proceeds to step 324 to terminate the conference call function and the conference call flag. Is set to "0". Subsequently, the signal processing unit 200 proceeds to step 326 to clear all variables and ends.
    As described above, the present invention includes a signal processing unit that performs signal processing for a multi-party conference call function in a small switching system, so that the signal processor digitally processes the voice signal input from each subscriber channel during the multi-party conference call. In the conventional analog system, the inflow of noise generated during signal processing is prevented, and the signal processing for the multi-party conference call is performed in software in the signal processing unit, so that the subscriber extension is easy.
    权利要求:
    Claims (1)
    [1" claim-type="Currently amended] In the multi-party conference call method in the exchange system having a signal processing unit for performing a signal processing for the multi-party conference call function,
    If there is a key input for a conference call function from a subscriber of the exchange system, checking whether the exchange system is currently in a conference call;
    Inputting CVSD data transmitted from each subscriber channel by setting the conference call mode if the exchange system is not currently in a conference call as a result of the inspection;
    Decoding CVSD data from each inputted subscriber channel and converting the received CVSD data into PCM data;
    And summing up each subscriber's PCM data by different subscribers, and then encoding the data into CVSD data and transmitting the same to each subscriber channel.
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    同族专利:
    公开号 | 公开日
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    1998-12-30|Application filed by 박태진, 삼성톰슨시에스에프 주식회사
    1998-12-30|Priority to KR1019980060843A
    1999-12-29|Priority claimed from GB9930724A
    2000-07-15|Publication of KR20000044346A
    优先权:
    申请号 | 申请日 | 专利标题
    KR1019980060843A|KR20000044346A|1998-12-30|1998-12-30|Method for calling multi-party conference through digital signal process in exchange system|
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