TWI427977B - Voip device and method of reducing noise thereof - Google Patents

Description

Network voice device and method for preventing noise thereof

The present invention relates to network voice, and more particularly to a network voice device and a method for preventing noise generation thereof.

The Voice over Internet Protocol (VoIP) service is an emerging call service that uses an open network to transmit voice images and uses packet-based voice to provide call services, just like using the Internet to transmit information. VoIP services are widely used because of their low cost of calls, and VoIP gateways are used to provide such VoIP services. A common VoIP gateway connects a plurality of telephones, including a Digital Signal Processor (DSP) and a Multiple Subscriber Line Interface Circuit (SLIC), for handling calls to the telephone.

At present, VoIP gateways generally use time-sharing multiplex technology to handle calls. Time-division multiplex technology refers to cutting the transmission bandwidth of a transmission line into a plurality of transmission channels (instant slots) according to a specific time, allowing users to share The same transmission line technology. In this way, when the telephone is in the on-hook state, the time-sharing multiplex bus will transmit a continuous high level to the SLIC. At this time, because the multiple transmission paths are tied together, the capacitance will increase and the voltage cannot be changed in time. The time-sharing multiplex bus is locked to a high level, thereby interfering with the packet transmission required for other telephones in the off-hook state, so that the call generates noise, which greatly reduces the quality of the VoIP call.

In view of this, it is desirable to provide a network voice device for preventing noise generated by its time-multiplexed bus bar being locked at a high level.

In addition, there is a need to provide a method for preventing VoIP from generating noise, which is used to prevent noise generated by the time-sharing multiplex bus in the VoIP device being locked at a high level.

The network voice device in the embodiment of the present invention comprises a time division multiplex bus, a multi-digit signal processor and a plurality of subscriber line interface circuits, and the subscriber line interface circuit is connected to the plurality of telephones one by one. The network voice device also includes a time slot allocation module, a processor control module and a subscriber line control module. The time slot allocation module is configured to divide the time division multiplex bus into a plurality of time slots, including a plurality of call slots and at least one specific time slot, and allocate a call slot for the subscriber line interface circuit for the call. The processor control module is configured to select a specific digital signal processor from the digital signal processor, and control the specific digital signal processor to generate high and low interval electrical signals to a specific time slot. The subscriber line control module is configured to control the subscriber line interface circuit to receive the high and low interval electrical signals from the specific digital signal processor by using a specific time slot. Wherein, when the subscriber line interface circuit detects the off-hook signal of the telephone connected thereto, the subscriber line control module controls the subscriber line interface circuit to complete the call by using the call slot allocated thereto, and controls the subscriber line interface after completing the call. The circuit receives high and low interval electrical signals from a specific digital signal processor by a specific time slot.

In the embodiment of the present invention, a method for preventing VoIP from generating noise is used in a network voice device, and the network voice device includes a time division multiplex bus, a complex digital signal processor, and a plurality of subscriber line interface circuits. A method for preventing VoIP from generating noise includes: dividing a time-sharing multiplex bus into a plurality of time slots, including a complex number a time slot and at least one specific time slot; a call time slot is allocated for the subscriber line interface circuit for the call; a digital signal processor is selected as the specific digital signal processor; and the specific digital signal processor is controlled to generate the high and low interval electrical signals Go to a specific time slot; control the subscriber line interface circuit to receive high and low interval electrical signals from a specific digital signal processor by a specific time slot, thereby preventing noise generated by the time division multiplex bus locking at a high level; determining the users Whether there is a subscriber line interface circuit detecting the off-hook signal in the line interface circuit; if there is a subscriber line interface circuit detecting the off-hook signal, controlling the subscriber line interface circuit detecting the off-hook signal is allocated to the subscriber line interface circuit The call slot completes the call; and the subscriber line interface circuit that controls the detected off-hook signal receives the high and low interval electrical signals from the specific digital signal processor by the specific time slot.

The above and the technical effects of the invention can be easily understood from the following detailed description of the embodiments and the accompanying drawings.

10‧‧‧Internet voice device

100‧‧‧ slot allocation module

102‧‧‧Processor Control Module

104‧‧‧User Line Control Module

12‧‧‧TDM bus

14‧‧‧DSP

140‧‧‧Specific DSP

16‧‧‧SLIC

20‧‧‧ telephone

30‧‧‧ VoIP network

1 is a diagram showing an implementation environment and a function module of an embodiment of a network voice device according to the present invention.

2 is a flow chart of an embodiment of a method for preventing VoIP from generating noise.

Referring to FIG. 1, there is shown an implementation environment and function module diagram of an embodiment of a network voice device 10 of the present invention. In the present embodiment, the network voice device 10 is connected between the Voice over Internet Protocol (VoIP) network 30 and the plurality of telephones 20 for processing the VoIP call of the telephone 20. The VoIP device 10 converts the data packet from the VoIP network 30 into a voice signal and inputs it to the phone 20, and converts the voice signal from the phone 20 into a data packet and inputs it to the VoIP network 30. Transfer to the other end of the VoIP call to implement the call. The VoIP device 10 is a VoIP access device, such as a VoIP gateway, and the phone 20 is a user terminal device with a VoIP call function, such as a VoIP phone, and the VoIP network 30 is a network for transmitting data signals, such as the Internet. .

The VoIP device 10 includes a Time Division Multiplexing (TDM) bus 12, a Digital Signal Processor (DSP), and a Subscriber Line Interface Circuit (SLIC). . The SLIC 16 is connected to the telephone 20 one by one for realizing communication between the network voice device 10 and the telephone 20, such as detecting the state of the telephone 20, transmitting a ringing tone to the telephone 20, and the like. In the present embodiment, the time division multiplex bus 12 can be divided into a plurality of time slots, and the network voice device 10 uses the time division multiplexing technology to simultaneously process multiple calls by using the time division multiplexing bus 12. In the present embodiment, the time division multiplex bus 12 is a Pulse Code Modulation (PCM) bus.

In the present embodiment, the network voice device 10 further includes a time slot allocation module 100, a processor control module 102, and a subscriber line control module 104 for preventing the time-sharing multiplex bus 12 from being locked at a high level.

The time slot allocation module 100 is configured to divide the time division multiplex bus bar 12 into a plurality of time slots, which include a plurality of call slots and at least one specific slot. The time slot is used to transmit the call data to realize the call, and the specific time slot is generally a relatively idle time slot for transmitting a specific electrical signal to prevent the time-sharing multiplex bus 12 from being locked at a high level. In the present embodiment, the time slot allocation module 100 selects at least one infrequent time slot as a specific time slot in the time slot of the time division multiplex bus 12, and then allocates a call time slot for the SLIC 16 for the call. As long as the phone 20 corresponding to the SLIC 16 is talking, it is by the allocation. The call slot is used to transfer the call data. In this embodiment, the correspondence between the call slot and the SLIC 16 may be fixed or dynamically allocated.

The processor control module 102 is configured to select a DSP from the DSP 14 as the specific DSP 140, and control the specific DSP 140 to generate high and low interval electrical signals to a specific time slot. The particular DSP 140 is typically a relatively idle DSP. In this embodiment, the output of the specific DSP 140 is connected to a specific time slot, and the high and low interval electrical signals are always outputted to a specific time slot. In the present embodiment, the high and low interval electrical signals refer to electrical signals that appear at high and low intervals, such as 10101010 or 01010101.

The subscriber line control module 104 is configured to control the SLIC 16 to receive high and low interval electrical signals from a specific DSP 140 by using a specific time slot. In the present embodiment, the subscriber line control module 104 connects all the inputs of the SLIC 16 to a specific time slot when the telephone 20 is on-hook, and loops the time-multiplexed bus 12 to cause loops. In this way, the high and low interval electrical signals that the specific DSP 140 inputs to the specific time slot can be input to the SLIC16 all the time. At this time, since the electrical signal received by the SLIC 16 connected to the telephone 20 in the on-hook state is not a continuous high level, but a high and low interval electrical signal, the capacitance effect between the transmission lines can be effectively eliminated, and the elimination is in the off-line. The telephone 20 in the state of the machine talks to the interference of the data transmission, so that the noise generated by the time-division multiplex bus 12 being locked at the high level can be effectively prevented.

When the telephone 20 is in the off-hook state, the SLIC 16 connected thereto detects the off-hook signal of the telephone 20 and feeds the signal back to the subscriber line control module 104.

The subscriber line control module 104 is further configured to control the SLIC 16 to complete the call by using the time slot allocated to the SLIC 16 when the SLIC 16 detects the off-hook signal of the telephone 20 connected thereto, and control the SLIC 16 by using a specific time slot after completing the call. High and low interval electrical signals are received from a particular DSP 140. In the present embodiment, the subscriber line control module 104 detects in the SLIC16. When the off-hook signal of the telephone 20 connected thereto is detected, the loopback disable of the time-sharing multiplex bus 12 is released, and the input of the SLIC 16 is connected to the call slot allocated thereto to complete the call. When the call is completed, the telephone 20 hangs up, the SLIC 16 detects the hang-up signal of the telephone 20, and the subscriber line control module 104 connects the input of the SLIC 16 to a specific time slot, and the time-division multiplex bus 12 is self-looped. A loop is generated. At this time, the high and low interval electrical signals outputted by the specific DSP 140 to the specific time slot are re-entered into the SLIC 16 to prevent the noise generated by the time division multiplex bus 12 being locked at a high level.

Referring to FIG. 2, a flow chart of an embodiment of a method for preventing VoIP device 10 from generating noise is shown. In the present embodiment, the method for preventing the VoIP device 10 from generating noise is implemented by each functional module of the VoIP device 10 of FIG.

In step S200, the time slot allocation module 100 divides the time division multiplex bus 12 into a plurality of time slots, including a plurality of call slots and at least one specific slot. The time slot is used to transmit the call data to implement the call, and the specific time slot is used to transmit a specific electrical signal to prevent the time-sharing multiplex bus 12 from being locked at a high level.

In step S202, the time slot allocation module 100 allocates a call slot for the SLIC 16 for the call.

In step S204, the processor control module 102 selects a DSP from the DSP 14 as the specific DSP 140.

In step S206, the processor control module 102 controls the specific DSP 140 to generate high and low interval electrical signals to a specific time slot. In this embodiment, the processor control module 102 first connects the output end of the specific DSP 140 to a specific time slot, and then controls the specific DSP 140 to output the high and low interval electrical signals. In this way, the specific DSP 140 will always output high and low interval telecommunications Number to a specific time slot.

In step S208, the subscriber line control module 104 controls the SLIC 16 to receive the high and low interval electrical signals from the specific DSP 140 by the specific time slot, thereby preventing the noise generated by the time division multiplexing bus 12 being locked at the high level. In this embodiment, the subscriber line control module 104 first connects the input end of the SLIC 16 to a specific time slot, and then self-loops the time-sharing multiplex bus 12 to cause a loop. In this way, the high and low interval electrical signals output by the specific DSP 140 are always input to the SLIC 16 through the specific time slot, thereby effectively preventing the noise generated by the time division multiplexing bus 12 being locked at the high level.

In step S210, the subscriber line control module 104 determines whether there is a SLIC 16 in the SLIC 16 that detects an off-hook signal. In the present embodiment, if the telephone 20 needs to make a call and picks up the phone, the SLIC 16 connected thereto detects the signal that the telephone 20 is off-hook.

If there is a SLIC 16 that detects the off-hook signal, then in step S212, the subscriber line control module 104 controls the SLIC 16 that detects the off-hook signal to complete the call using the call slot assigned to it. In this embodiment, the subscriber line control module 104 first releases the self-loop of the time-sharing multiplex bus 12, and then accesses the input slot of the SLIC 16 that detects the off-hook signal to the call slot allocated to complete the call. .

After the call is completed, the process returns to step S208, and the subscriber line control module 104 controls the SLIC 16 that detects the off-hook signal to receive the high and low interval electrical signals from the specific DSP 140 by using a specific time slot after completing the call. At this time, the high and low interval electrical signals transmitted by the specific DSP 140 to the specific time slot are re-entered into the SLIC 16 detecting the off-hook signal, thereby preventing the noise generated by the time-sharing multiplex bus 12 being locked at the high level.

The VoIP device 10 and the method for preventing the same are provided by the specific DSP 140 and the specific time slot to transmit the high and low interval electrical signals to the SLIC 16 to effectively prevent the WLAN. The multiplexed bus 12 is locked at a high level to generate noise, so that other calls in the off-hook state can transmit the packets required for the call without interference, thereby greatly improving the quality of the network voice call.

In summary, the present invention complies with the requirements of the invention patent and submits a patent application according to law. The above description is only the preferred embodiment of the present invention, and equivalent modifications or variations made by those skilled in the art of the present invention should be included in the following claims.

10‧‧‧Internet voice device

100‧‧‧ slot allocation module

102‧‧‧Processor Control Module

104‧‧‧User Line Control Module

12‧‧‧TDM bus

14‧‧‧DSP

140‧‧‧Specific DSP

16‧‧‧SLIC

20‧‧‧ telephone

30‧‧‧ VoIP network

Claims (6)

A network voice device includes a time division multiplex bus, a plurality of digital signal processors, and a plurality of subscriber line interface circuits, wherein the subscriber line interface circuits are connected to a plurality of telephones, and the network voice device further includes: a time slot a distribution module, configured to divide the time-sharing multiplex bus into a plurality of time slots, including a plurality of call slots and at least one specific time slot, and allocating a call slot for the subscriber line interface circuit for calling; a control module, configured to select one of the digital signal processors as a specific digital signal processor, and control the specific digital signal processor to generate high and low interval electrical signals to the specific time slot, and the processor control module further uses The output of the specific digital signal processor is connected to the specific time slot, and the high and low interval electrical signals are always outputted to the specific time slot; and the subscriber line control module is configured to control the user line interface circuit by The specific time slot receives high and low interval electrical signals from the specific digital signal processor, wherein the subscriber line control module is further used to be at the telephone In the state of the machine, the input terminals of the subscriber line interface circuits are connected to the specific time slot, and the time division multiplex bus is self-looped to form a loop; wherein, when the subscriber line interface circuits detect the connection thereto When the off-hook signal of the telephone is off, the subscriber line control module controls the subscriber line interface circuits to complete the call by using the call slot allocated to the subscriber line, and controls the subscriber line interface circuit to control the subscriber line interface circuit after the call is completed. High and low interval electrical signals are received from the particular digital signal processor. The VoIP device of claim 1, wherein the subscriber line The control module is further configured to release the self-loop of the time-sharing multiplex bus when the subscriber line interface circuit detects the off-hook signal of the telephone connected thereto, and connect the input terminals of the subscriber line interface circuits Enter the call slot assigned to it to complete the call. The VoIP device of claim 1, wherein the high and low interval electrical signals comprise 01010101 or 10101010. A method for preventing a network voice device from generating noise, the network voice device comprising a time division multiplex bus, a plurality of bit signal processors and a plurality of subscriber line interface circuits, the method comprising: ranking the time division multiplex bus a plurality of time slots, including a plurality of talk time slots and at least one specific time slot; assigning a call time slot to the subscriber line interface circuit for calling; selecting one of the digital signal processors as a specific digital signal processor; controlling The specific digital signal processor generates a high and low interval electrical signal to the specific time slot, and the output of the specific digital signal processor is connected to the specific time slot; and the high and low interval electrical signals are always outputted to the specific time slot; The input end of the subscriber line interface circuit is connected to the specific time slot; the time division multiplex bus is self-looped from the ring to cause a loop, so that high and low interval electrical signals are input into the subscriber line interface circuit, thereby preventing the time division multiplex bus from being locked in The noise generated by the high level; determining whether there is a subscriber line interface circuit detecting the off-hook signal in the subscriber line interface circuits; We have detected an off-hook signal of a subscriber line interface circuit, to control the detecting slot allocated to the call when the subscriber line interface circuit which off-hook signal is completed The user circuit interface circuit that controls the detected off-hook signal receives the high and low interval electrical signals from the specific digital signal processor by the specific time slot after the call is completed. The method for preventing VoIP from generating noise according to claim 4, wherein the high and low interval electrical signals include 01010101 or 10101010. The method for preventing a VoIP device from generating noise according to claim 5, wherein the step of controlling the subscriber line interface circuit that detects the off-hook signal to complete the call by using the call slot allocated thereto comprises: releasing the The self-loop of the time-sharing multiplex bus; and the input of the subscriber line interface circuit that detects the off-hook signal is connected to the call slot allocated to complete the call.