• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    end. TECHNICAL FIELD The present invention relates to an electronic exchanger, and more particularly, to an apparatus for testing an echo canceller installed between an electronic exchanger and a terminal. I. Technical problem to be solved by the present invention: In order to test whether the echo component of the conventional echo canceller is removed, there is a problem in that a separate test apparatus including the noise generator 100 and the echo detector 150 is provided. All. Summary of the Invention Solution: When testing the efficiency of the echo canceller that removes the echo generated during a normal voice call, the user can directly test through a simple configuration connecting two ordinary telephones. la. Significant use of the invention: Applicable to echo cancellation test equipment in exchangers.
    公开号:KR19990034830A
    申请号:KR1019970056529
    申请日:1997-10-30
    公开日:1999-05-15
    发明作者:이대영
    申请人:윤종용；삼성전자 주식회사；
    IPC主号:
    专利说明:

    Echo Cancellation Test Unit
    TECHNICAL FIELD The present invention relates to an electronic exchanger, and more particularly, to an apparatus for testing an echo canceller installed between an electronic exchanger and a terminal.
    In general, echo refers to a phenomenon in which a clear and unclear call is repeated for a caller or a caller through a path other than the intended call path. At this time, the caller's call is returned to the caller again, and the caller's echo is transmitted back to the called party.
    In order to remove the echo phenomenon, an echo canceller as shown in FIG. 1 is used between the electronic exchanger and the terminal, and a separate test apparatus is provided to test the echo canceling efficiency removed by the echo canceller.
    1, the operation of the conventional echo canceller and the test apparatus will be described with reference to FIG. 1. First, the transmitter-side noise generator 100 has white noise corresponding to 300 to 3400 Hz of the same bandwidth as the general audio bandwidth. noise) is generated and output to the reception input terminal of the echo canceller 110. At this time, the echo canceling device 110 outputs the noise signal to the echo delay circuit 120 at a later stage to artificially delay the input signal. The delayed output signal from the echo delay circuit 120 is input to the mixer 130 of the rear stage, the mixer 130 is a noise signal generated from the receiving noise generator 140 and the echo delay circuit 120 The delay signal input from the mixed signal is input to the transmission input terminal of the echo canceller 110. Therefore, the echo cancellation apparatus 100 removes a signal (transmission side noise) including an echo component from the mixed signal input based on the reception noise original signal input from the transmission side noise generator 100, and then outputs the output. The echo detection unit 150 transmits the echo component to determine whether the echo component is removed.
    However, in order to test whether the echo component is removed in the conventional echo canceller as described above, there is a problem in that a separate test apparatus including the noise generator 100 and the echo detector 150 is provided.
    Accordingly, an object of the present invention is to provide a device that does not require separate test equipment by simply connecting two telephones to remove the echo efficiency of the echo canceller that removes the echo component between the exchanger and the terminal.
    In order to achieve the above object, the present invention provides an apparatus for performing echo cancellation test by connecting two transmitting / receiving telephone terminals to respective hybrid circuits in an exchange subscriber circuit; A combo circuit unit connected to the hybrid circuit units and converting a voice signal transmitted / received through the two transmit / receive hybrid circuits to PCM data or to convert PCM data to a voice signal; A PPO memory unit for delaying the transmission-side voice signal outputted by the PCM data by a predetermined time, and a transmission-side transmission voice signal connected to the combo circuit unit and converted into a PCM voice data signal by the combo circuit unit. And a receiving input terminal for receiving a receiving side transmission voice signal converted by the combo circuit unit into a PCM voice data signal and an echo component signal of the transmitting side transmission audio signal returned from the receiving side hybrid circuit. And the echoed audio signal reflected based on the received transmitter-side transmitted audio signal. Characterized in that the removal output for echo cancellation comprising a.
    1 is a block diagram of an echo cancellation test apparatus in a conventional exchanger.
    2 is a block diagram of an echo cancellation test apparatus in an exchange according to an exemplary embodiment of the present invention.
    Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.
    2 is a block diagram of an echo cancellation device and a test device according to an embodiment of the present invention. Referring to FIG. 2, the configuration of the present block is divided into two parts, an echo cancellation block and a test block. Therefore, the echo cancellation block is connected to the hybrid circuit in the switch subscriber circuit to remove the echo component of the speech signal during a voice call, and includes an echo canceller 260 and a combo circuit. ), A serial to parallel convert 270, a parallel to serial convert 290, and a fifo memory 280.
    In this case, the combo circuit 250 is connected to the transmit / receive hybrid circuits 230 and 240 in the switch subscriber circuit, respectively, and transmits / receives voice signals transmitted / received through the two transmit / receive hybrid circuits 230 and 240. (PCM: Pulse Code Modulation, hereinafter referred to as PCM).
    The echo memory 280 is the echo canceller 260 delays the transmission-side voice signal, which has been converted and outputted through the combo circuit 250, by a predetermined time, and then receives the hybrid through the combo circuit 250. 230).
    The echo canceling unit 260 is connected to the combo circuit unit 250, and receives a receiving input terminal for receiving a transmission side transmission voice signal converted by the combo circuit unit 250 into a PCM voice data signal, and the combo circuit unit A transmission input terminal for receiving an echo component signal of a reception side transmission voice signal converted into a PCM voice data signal by 250 and a transmission side transmission voice signal returned from the reception side hybrid circuit 230; The echoed transmission audio signal is removed and output based on the received transmission audio signal.
    Finally, the serial / parallel converter 270 and the parallel / serial converter 290 convert serial data into parallel data to record and read the parallel PC audio data signal to the PIM memory 280. Or convert the parallel data into serial data.
    On the other hand, the test block is a device that performs the role of testing the echo cancellation efficiency of the echo cancellation block during a voice call, connecting the transmitting and receiving two terminal devices (200, 210) to the subscriber circuit 240 of the exchange, the corresponding Hybrid circuits 240 and 250 are coupled to the echo cancellation block.
    Therefore, operation of the echo cancellation test apparatus having the above configuration will be described. First, two telephone terminals 200 and 210 are connected to the subscriber circuit unit 220 of the exchange, and then a call path is formed for two telephone terminal periods. At this time, the exchange side performs the call without connecting the call path to the echo cancellation block. Therefore, the user can check the echo phenomenon occurring at the transmitting side when the echo cancellation block is not connected.
    Thereafter, the exchange connects the transmit / receive hybrid circuits 230 and 240 in the subscriber circuit unit 220 to the echo cancellation block and performs the echo cancellation test through the transmission / reception telephone terminals 200 and 210, respectively.
    As an example, first, a call path is formed in two transmitting / receiving phone terminal periods connected to the subscriber circuit unit 220, and then a user receives a voice signal through the transmitting phone terminal 200 to receive the other party's receiving phone terminal 210. To send). At this time, the transmitted voice signal is input to the subscriber circuit unit 220 → transmitting side hybrid circuit 240 → echo canceller block 250 of the switch via the telephone line. The voice signal is converted into PCM data through the combo circuit 250 of the echo cancellation block, and then input to a receive input terminal (Rin) of the echo cancellation unit 260 at a later stage. The PC voice data input to the reception input terminal of the echo canceller 260 is temporarily stored in the PPI memory 280 at a later stage through its receive output terminal (Rout). Thereafter, the exchange generates an artificial reset signal (lead) to the PPO memory 280, and outputs the recorded PCM voice data to delay-transmit the temporarily stored voice data for a predetermined time. In this case, the front and rear ends of the PPO memory 280 are provided with a serial / parallel converter 270 for converting serial data into parallel data and a parallel / serial converter 280 for converting parallel data into serial data, respectively. Is stored in parallel.
    On the other hand, the PC voice data delayed and output through the PPO memory 280 is converted into an analog voice signal through the combo circuit 250 again via the receiving-side hybrid circuit 230 → subscriber circuit unit 220 The final receiving telephone terminal 210 is sent. At this time, the analog voice signal returned from the reception side hybrid circuit 230 is input to the combo circuit 250 and is input to a send input terminal (Sin) of the echo canceller 260. Therefore, the echo canceling unit 260 removes the echoed audio signal according to the delayed time by comparing the echoed audio signal inputted to the transmission input terminal with the original signal inputted to the receiving input terminal.
    Therefore, the send output terminal (Sout) of the echo canceller 260 outputs only the transmission voice signal generated from the receiving telephone terminal. At this time, the path of the voice signal generated from the receiving telephone terminal 210 side is the receiving telephone terminal 210 → subscriber circuit unit 220 → receiving hybrid circuit 230 → combo circuit unit 250 → echo canceling unit ( 260 is a transmission input / output terminal → combo circuit section 250 → transmission hybrid circuit 240 → subscriber circuit section 220 → transmission side telephone terminal 200.
    In conclusion, the present invention allows the user to directly test through a simple configuration of connecting two ordinary telephones when testing the efficiency of the echo canceller to remove the echo generated during a general voice call.
    Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications may be made without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by the equivalents of the claims.
    As described above, the present invention provides a simple test apparatus connecting two ordinary telephones when testing the efficiency of an echo canceller for removing echoes generated during a general voice call. There is an advantage.
    In addition, it is possible to reduce the cost when configuring the test system by not having to provide a separate test equipment, the user also has the advantage that the test results can be obtained more easily.
    权利要求:
    Claims (1)
    [1" claim-type="Currently amended] An apparatus for performing echo cancellation test by connecting two transmitting / receiving telephone terminals to respective hybrid circuits in an exchange subscriber circuit,
    A combo circuit unit connected to each of the hybrid circuit units and converting a voice signal transmitted / received through the two transmit / receive hybrid circuits into PCM data, or converting PCM data into a voice signal;
    A pipo memory unit for delaying a transmission-side voice signal, which has been converted and outputted through the combo circuit unit, for a predetermined time;
    A reception input terminal connected to the combo circuit section, for receiving a transmission side transmission voice signal converted by the combo circuit section into a PC audio data signal, and a reception side transmission voice converted to a PC audio data signal by the combo circuit section; A transmission input terminal for receiving a signal and an echo component signal of a transmission side transmission voice signal returned from the reception side hybrid circuit, and the transmission input terminal based on the transmission side transmission audio signal received through the reception input terminal. Echo cancellation test apparatus, characterized in that the echo cancellation unit for removing and outputting the echo transmission voice signal received through.
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    同族专利:
    公开号 | 公开日
    KR100247034B1|2000-03-15|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    1997-10-30|Application filed by 윤종용, 삼성전자 주식회사
    1997-10-30|Priority to KR1019970056529A
    1999-05-15|Publication of KR19990034830A
    2000-03-15|Application granted
    2000-03-15|Publication of KR100247034B1
    优先权:
    申请号 | 申请日 | 专利标题
    KR1019970056529A|KR100247034B1|1997-10-30|1997-10-30|Echo elimination testing device|
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