KR930006547B1 - Method of receiving r2mfc/dtmf/cct combination in use digital signal processor - Google Patents

Abstract

The method maximizes the operation efficiency and processing ability of a program by adding idle function mode to conventional R2MFC,DTMF,CCT function modes. It is composed of the stages of: initializing the data to be executed by a reception program; discriminating the execution function mode information; repeating from the 2nd stage after stand by for shorter time than that needed to read new function mode information; and repeating from the 2nd stage after executing the function of corresponding data detecting.

Description

R2MFC / DTMF / CCT combined receiving method using digital signal processor with idle function added

1 is a configuration blur diagram of an R2MFC / DTMF / CCT combined receiver using a digital signal processor.

2 is a view showing the information area of the input / output memory in the R2MFC / DTMF / CCT receiving device.

3 is a view showing the reception area of the input / output memory in the R2MFC / DTMF / CCT combined receiver.

4 is a general program flow diagram showing a method for receiving a combined R2MFC / DTMF / CCT in a conventional digital signal processor.

5 is a program flow diagram illustrating a method of receiving a combined R2MFC / DTMF / CCT in a digital signal processor to which an idle function of the present invention is added.

The present invention uses the same device to combine R2 MFC (R2 Multi-Frequency Compelled) signal, DTMF (Dual Tone Multi-Frequency) signal and CCT (Continuity Check Tone) signal, which are used for connection to the channel during the call processing in the electronic exchange. It relates to a receiving method.

Digital signal processors (DSPs), which are capable of high-speed operation due to the rapid development of digital signal processing technology and semiconductor technology along with the digitalization of communication networks and exchanges, are widely used in communication and exchange fields. If you implement various signal service devices such as R2MFC receiver, DTMF receiver, CCT receiver, etc. to which signal processing technology is applied as digital signal processor, you can apply multiplexing concept, reduce the volume, improve reliability, reduce price, There are advantages such as ease of maintenance, and moreover, the above devices are distributed by signal service functions in the exchange, and each device has been used. The digital signal processor uses a combined receiver of R2MFC signal, DTMF signal and CCT signal. R2MFC / DTMF / CCT signal combined reception performed by digital signal processing in the receiver By developing and using the R2MFC / DTMF / CCT combined receiver using the digital signal processor that can receive and detect the signals by the program, the production cost can be reduced when the device is downsized and manufactured. There is an advantage that the efficiency is increased by easy maintenance and operation.

However, the R2MFC / DTMF / CCT combined receiving program in the digital signal processor of the R2MFC / DTMF / CCT combined receiver receives the function mode information to be executed and receives the R2MFC function mode or DTMF function regardless of the existence of the signal data input for each channel. Select one of mode or CCT function mode to execute the program, and the signal data for each channel input to the receiving device does not always exist but only when a call is made. When one signal service function mode is selected, each selected signal Since the digital signal processor receives and receives the new function mode information after receiving and processing the sample data in the form of Pulse Code Modulation (PCM) required for signal detection, the digital signal is performed. It takes a short time for the processor to receive new function mode information. It is. R2MFC, DTMF, and CCT signals occur continuously for a short time and cause the loss of the corresponding signal information if the signal is not detected immediately after the signal is generated.The digital signal processor is responsible for PCM data on the receiving channel of the signal subhighway. Even though there is no present, when one of the above three function modes is selected and the program is executed, immediately after reading the function mode information, the other function mode information is changed and PCM data of the corresponding signal is inputted. In the functional mode that the digital signal processor actually performs, the PCM signal data inputted to the signal subhighway cannot be received and detected, which causes a loss of the input signal information.

On the other hand, the period of reading new function mode information is different depending on the signal detection method used for signal detection for each signal. Generally, when detecting a R2MFC signal and a CCT signal using a Discrete Fourier Transform (DFT) calculation method. 17 ms is required, and 13 ms or more is required when detecting a DTMF signal using a digital filter (DF) method.

In order to improve the above-mentioned disadvantages, the present invention adds an idle function mode in addition to the R2MFC, DTMF, and CCT function modes to maximize the operational efficiency and processing capacity of the program when receiving a combined R2MFC / DTMF / CCT signal. The present invention provides a method of receiving R2MFC / DTMF / CCT combined.

The present invention includes a digital signal processor, an EP gap connected to the digital signal processor, a channel multiplexing circuit, an input / output memory, a monitor, a reset circuit and a local oscillator, the channel multiplexing circuit and a timing control circuit connected to a monitor to achieve the above object. In a R2MFC / DTMF / CCT combined receiver, a first step of initializing various data contents required for an R2MFC / DTMF / CCT combined receiving program to be executed in the digital signal processor, wherein PCM data is transferred into the digital signal processor. If the PCM data is input after the PCM data is input, the function mode to be executed after reading the function mode information sent from the microcontroller from the input / output memory is the function of the R2MFC / DTMF / CCT function or the idle function. In the second step of determining the recognition, the idle function in the second step If it is determined, while performing the maintenance function in the digital signal processor, waiting for a time shorter than the time required to read new function mode information when performing the signal detection function, the PCM data is input into the digital signal processing. A third step of repeatedly performing the second step of continuously checking whether or not it is determined to be an R2MFC / DTMF / CCT function in the second step, and a function mode to be performed according to the performance function mode information is an R2MFC function. And a fourth step of performing a signal detection function of a signal corresponding to each function by repeating whether the function is a DTMF function or a CCT function.

Hereinafter, with reference to the accompanying drawings will be described in detail the present invention. FIG. 1 is a block diagram of an R2MFC / DTMF / CCT combined receiver using a digital signal processor. An EP (Erasable and Programmable) ROM (3) (4) and a channel multiplexing circuit (centered around the digital signal processor 5) are shown in FIG. 6) an input / output memory (2), a timing control circuit (10), a microcontroller (1), a monitor (7), a reset circuit (9), and a local oscillator (8). When the digital signal processor 5 receives the PCM data input according to the FS and the clock signal CLK, detects the signal information, and informs the microcontroller 1 of the corresponding signal information through the input / output memory 2. When notified to the microcontroller 1, the microcontroller 1 organizes this information for each received channel and transmits the information to the controller. Here, the microcontroller 1 receives the signal information detected by the digital signal processor 5 from the input / output memory 2 in which the signal information is written, and arranges the received channel information for each received channel to the control device and receives it through the monitor 7. The operation state of the device is monitored and if a failure occurs, the reset circuit 9 is driven to reactivate the digital signal processor 5, and the input / output memory 2 detects the information detected by the digital signal processor 5. The microcontroller (1) and the digital signal processor (5) are input through the channel multiplexing circuit (6) to inform the host controller of the controller and to obtain the function mode information to be performed by the digital signal processor (5) from the Zener device. After receiving the PCM data to detect the signal information by the signal receiving program built in the EP ROM (3) (4), and sends this information to the input and output memory 2), The secondary oscillator 8 provides the clock frequency necessary for the operation of the digital signal processor 5, the EP ROM 3 and 4 provides the clock frequency necessary for the operation of the digital signal processor 5, and the EP ROM ( 3) (4) includes a signal receiving program executed by the digital signal processor 5.

The reset circuit 9 receives a signal from the microcontroller 1 and resets the operation of the digital signal processor 5, and the channel multiplexing circuit 6 allows the digital signal processor 5 to process multiple channels. This circuit selects only the necessary channels from the signal subhighway multiplexed into multiple channels, and receives the signal from the timing control circuit 10 to receive the PCM data input from the time switch device. It provides a function to send only PCM data corresponding to the channel to the digital signal processor 5, and the timing control circuit 10 receives the FS and CLK signals from the time switch device and requests them from the channel multiplexing circuit 6 and the monitor 7. The monitor 7 receives signals from the digital signal processor 5 and the timing control circuit 10 and monitors the operation state of the receiving device to monitor and monitor the operation. The functions provided to the microcontroller (1).

2 is an information area display diagram of the input / output memory 2 in the R2MFC / DTMF / CCT receiving device, which is used to indicate performance function mode information that the digital signal processor 5 should receive and process. Is provided by the microcontroller 1 to the digital signal processor 5. The information area consists of data in 1 byte unit, and at least two bits are required to display four types of function mode information such as R2MFC, DTMF, CCT, and Idle for each channel. In the order of the channels performed in the digital signal processing (5), the D7 and D6 bits indicate the function mode information of the first channel, the D5 and D4 bits indicate the function mode information of the second channel, and the rest. Bits also indicate sequential channel-specific function mode information. Accordingly, bits D1 and D0 indicate function mode information of a fourth channel. If the combined value of bit 1 and bit 0 is '0, 1' for each channel, it indicates R2MFC function mode, '1, 0' indicates DTMF function mode, and '1, 1' indicates CCT function mode. In the case of '0, 0', the idle function mode is indicated. When the number of service channels increases according to the signal processing capacity of the digital signal processor 5, the information area is significant and the channel information is performed in the same manner as described above. The function mode information may be displayed.

FIG. 3 is a view showing the reception area of the input / output memory 2 in the R2MFC / DTMF / CCT combined receiver, which is used to transmit the signal information, which is a result of the detection detected by the digital signal processor 5, to the microcontroller 1. FIG. Area. The reception area is composed of data in one byte unit like the information area of FIG. 2, and all of one byte is used to represent the received and detected signal information for each channel. The D0 to D3 bits indicate the received and detected signal information. , D4 bit indicates the meaning of the received and detected signal information, and in the case of D5 to D7 bits, the meaning differs depending on the function mode.In the DTMF function mode, the D4 bit indicates whether the received and detected signal information is new data, and R2 In the MFC function mode, the direction of the signal information is displayed. In the CCT function mode, the received signal information is valid.

Bits D0 to D3 indicating the signal information are different depending on the function mode being performed. In the case of the R2MFC function mode, signal codes 1 to 15 and null signals mean that there is no signal information. 16 kinds of signal information such as 0 signal code, etc. are displayed.When it is executed in DTMF function mode, 16 kinds of signals such as digits from 0 to 9 and special digits *, #, A, B, C, D are displayed. When the information is executed in the CCT function mode, three types of signal information, such as signal code information of 1 and 2 and a zero signal code indicating a null signal indicating that there is no signal information, are displayed.

The D4 bit, which indicates the meaning of the received detected signal information, has a different meaning depending on the performance mode and the set or reset state of the D4 bit.In the case of the R2MFC function mode, the D4 bit indicates rear signal information when the D4 bit is set. When the D4 bit is reset, it indicates the forward signal information.When the D4 bit is set to the DTMF function mode and the CCT function mode, it indicates that the received detected signal information is set when the D4 bit is set and the received detected signal when the D4 bit is reset. Indicates that the information is invalid.

In the case of bits D5 to D7, the meaning differs depending on the function mode, i.e., in the DTMF function mode, it indicates whether the received detected signal information is new data, and only when it is detected as new signal information data (n + 1). When the content of the current signal information data (n) is' 0, 1, 0 ', the value is changed to' 1, 0, 1 ', and again, when new signal information data (n + 2) is received and detected again,' 0, Change to 1, 0 'value. In this way, the D5 to D7 bits are toggled only when new signal information is received. However, in the R2MFC function mode, it indicates the direction of the signal information, which is the meaning of the signal information, similarly to the DR bit.It indicates the backward signal information when all of the D5 to D7 bits are set, and the forward signal information when all the D5 to D7 bits are reset. In addition, when the D4 to D7 bits are set in the CCT function mode, it indicates that the received and detected signal information is a valid value, and when the D4 to D7 bits are all reset, the received and detected signal information is invalid. It is a value.

4 is a general program flow diagram showing a conventional R2MFC / DTMF / CCT receiving method in the digital signal processor 5. The digital signal processor 5 receives and detects an R2MFC signal, a DTMF signal, or a CCT signal by performing this program. The process is as follows.

When the power is first turned on, the program starts to be executed, and initializes various data contents necessary for the R2MFC / DTMF / CCT receiving program to be executed in the digital signal processor 5 (11), and the PCM data is converted into the digital signal processor (5). (12) PCM data was inputted, and after performing function mode information sent from the microcontroller (1) to the input / output memory (2) (13), the function mode to be performed was R2MFC. Check whether it is a function, a DIMF function, or a CCT function (14), and if it is determined as an R2MFC function, performs a signal detection function of the R2MFC signal (15), and checks whether the PCM data is input into the digital signal processor (5). The process is repeated from step 12, which is continuously being checked, and the step of checking whether the function mode to be performed is an R2MFC function, a DTMF function or a CCT function In (14), if the DTMF function is determined, the signal detection function of the DTMF signal is performed (16), and if it is determined as the CCT function, the signal detection function of the CCT signal is performed (17), and the PCM data is the digital signal. The process is repeated from step 12 which continuously checks whether or not it has been input into the processor 5.

As described above, the R2MFC / DTMF / CCT combined reception program in the digital signal processor 5 of the R2MFC / DTMF / CCT combined receiver receives the function mode information to be performed and receives the R2MFC function regardless of the existence of the signal data input for each channel. Mode, DTMF function or CCT function mode is selected to execute the program, and after receiving and processing the PCM-type sample data required for signal detection for each selected signal, the new function mode information is executed. It takes some time before 5) receives new function mode information. R2MFC, DTMF, and CCT signals occur continuously for a short time and cause the loss of the corresponding signal information when the signal is not detected immediately after the signal is generated. PCM data does not exist in the reception channel of the signal service. Nevertheless, when one of the above three functional modes is selected and the program is executed, the digital signal processor 5 changes to other functional mode information immediately after reading the functional mode information and inputs the corresponding PCM data. Since the PCM signal data inputted to the signal subhighway cannot be received and detected as a function mode that is actually performed, a loss of the input signal information occurs at this time.

In this patent, in order to improve the above disadvantages, in addition to the R2MFC, DTMF, and CCT function modes, the idle function mode is added to perform the idle function mode when PCM data does not exist in the receiving channel. 5) When performing in the idle function mode among the signal receiving programs in the above, in the above three function modes that perform the signal detection function while performing the maintenance function in the digital signal processor 5, not performing the signal detection function. Read the function mode information at a time shorter than the time required.

5 is a program flow chart showing a method of receiving R2MFC / DTMF / CCT combined in the digital signal processor 5 to which an idle function of the present invention is added, and the digital signal processor 5 performs the program to execute a signal function mode. The reception and detection of the R2MFC signal, the DTMF signal or the CCT signal as shown in FIG. 4 while preventing the loss of signal information that may occur during the conversion of information, the process is as follows.

When the power is first turned on, the program starts to be executed, and initializes various data contents necessary for the R2MFC / DTMF / CCT receiving program to be executed in the digital signal processor 5 (18), and the PCM data is converted into the digital signal processor (5). If the PCM data is input, the function mode to be performed is read (20) after the execution function mode information sent from the microcontroller (1) is read from the input / output memory (2). It checks whether it is R2MFC / DTMF / CCT function or Idle function (21), and if it is determined as Idle function, it performs maintenance function in digital signal processor (5) and reads new function mode information when performing signal detection function. After waiting for a time shorter than the required time (26), it is continuously checking whether the PCM data has been input into the digital signal processor (5). Repeated from step 19. However, in the step of checking whether the function mode to be performed is an R2MFC / DTMF / CCT function or an Idle function (21), if it is determined that it is an R2MFC / DTMF / CCT function, the function mode information read in step 20 is performed. Check whether the function mode to be R2MF function, DTMF function or CCT function (22) is determined as the R2MFC function and performs the signal detection function of the R2MFC signal (23), the PCM data is the digital signal processor (5) If it is determined as DTMF function in the step (19) of continuously checking whether it has been inputted in (19) and checking whether the function mode to be performed is an R2MF function, a DTMF function or a CCT function (22). After performing the signal detection function of the DTMF signal (24), and also performing the signal detection function of the CCT signal (25) when it is determined as the CCT function (25), the above PCM data is input into the signal processor (5). Is repeated from step (19) for continuously checking.

The signal receiving program in the digital signal processor 5 is being executed by the R2MFC / DTMF / CCT combined receiver shown in FIG. There is a possibility that the signal information is changed due to the change in the new function mode information. In order to improve this, step 21 and step 26 are added between step 13 and step 14 of FIG. (Idle) function is implemented, and thus, when it is performed in the idle function mode, the maintenance time in the digital signal processor 5 is shorter than the time required in the above three function modes to perform the signal detection function while performing the maintenance function in the digital signal processor 5. R2MFC / D prevents loss of signal information by performing function function information read at periodic intervals and at the same time performs maintenance function in digital signal processor. When receiving TMF / CCT signals in combination, there is an advantage to maximize the program's operational efficiency and processing power.

Claims (4)

A digital signal processor (5), an EP tom (3) (4) connected to the digital signal processor (5), a channel multiplexing circuit (6), an input / output memory (2), a monitor (7), a reset circuit (9), and R2MFC / with local oscillator 8, microcontroller 1 connected to the input / output memory 2 and monitor 7, timing multiplexing circuit 6 and timing control circuit 10 connected to monitor 7 In the DTMF / CCT combined receiver, the digital signal processor (5) initializes (18) various data contents required for the R2MFC / DTMF / CCT combined receiving program to be executed, wherein the PCM data is the digital signal. If the PCM data is input, the function mode information sent from the microcontroller 1 is read from the input / output memory 2 after the input of the PCM data (20). Whether all of the functions to be performed are R2MFC / DTMF / CCT functions, or Is a second step of determining whether it is an idle function, and if it is determined as an idle function in the second step, while performing a maintenance function in the digital signal processor 5, new function mode information is read when performing a signal detection function. After waiting for a time shorter than the required time (26), a third step of repeating from the second step of continuously checking whether the PCM data has been input into the digital signal processor (5); If it is determined in step 2 that the RWMFC / DTNF / CCT function, the function mode to be performed according to the performance function mode information to check whether the R2MFC function, DTMF function or CCT function (22), the signal corresponding to each function And a fourth step of performing a signal detection function of the second step and repeating from the second step. The method of claim 1, wherein the function of the idle function has functional means for reading performance function mode information at a time shorter than the time required in the R2MFC, DTMF, and CCT function modes for performing a signal detection function. R2MFC / DTMF / CCT combined receiving method characterized in that there is. The information area of the input / output memory (2) is composed of a combination of two bits represented by bit 1 and bit 0 to display the function mode information for each channel. R2MFC / DTMF / CCT combined receiving method characterized in that. 4. The method of claim 3, wherein in the first byte of data, bits D7 and D6 represent functional mode information of a first channel, bits D5 and D4 represent functional mode information of a second channel, and are sequential for the remaining bits. R2MFC / DTMF / CCT combined receiving method characterized in that to indicate the function mode information for each channel.