KR920014305A - Multi-channel R2MFC / DTMF / CCT Receiving Method Using Digital Signal Processor - Google Patents

Abstract

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Description

Multichannel R2MFC / DTMF / CCT Receiving Method Using Digital Signal Processor

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FIG. 1 is a block diagram showing the configuration of a receiver for a combined R2MFC / DTMF / CCT receiver using a digital signal processor. Receive area display diagram of the input / output memory in the receiving device.

Claims (7)

Digital signal processing (5), EP ROM (3) (4) connected to the digital signal processor (5), channel multiplexing circuit (6), input / output memory (2), monitor (7), reset circuit (9), local R2MFC / DTMF with an oscillator 8, a microcontroller 1 connected to the input / output memory 2 and a monitor 7, the channel multiplexing circuit 6 and a timing control circuit 10 connected to a monitor 7 In the / CCT combined receiving apparatus, a first step of initializing (11) various data contents required for the multi-channel R2MFC / DTMF / CCT combined receiving program to be executed in the digital signal processor (5), wherein the PCM data is 12. If the PCM data is input, performance function mode information sent from the microcontroller 1 is read from the input / output memory 2 (13). The digital signal processor 5 has to process A second step of processing related data before performing a signal detection process of a corresponding channel according to the sequence number of channels in a channel; a memory lookup table method for the PCM data inputted to the digital signal processor 5 after the second step A third step of converting the linear data into linear data by using the second step; and a fourth step of determining whether the function mode to be processed in the channel performed according to the performance function mode information after the third step is an R2MFC / CCT function or a DTMF function. If the R2MFC / CCT function is determined in the fourth step, multiply the window function with respect to the linear data and calculate the power spectrum for each frequency component of the R2MFC signal and the CCT signal according to the DFT method. The fifth step of determining whether the function mode to be processed in the channel to be performed is the R2MFC or CCT function, and the fourth step is determined as the DTMF function. The sixth step of performing the signal detection function of the DTMF signal by the DF method using the transformed surface linear data, and the sequence number of the channel to be processed by the digital signal processor 5 after the fifth and sixth steps And a seventh step of determining and performing the relevant data after performing the function of the corresponding channel, and repeating the process again from the second step. The method according to claim 1, further comprising the step of detecting the corresponding signal code information by applying a related parameter for detecting and determining as an R2MFC signal code using the DFT calculation result when it is determined as the R2MFC function in the fifth step. Multi-channel R2MFC / DTMF / CCT combined receiving method characterized in that. The method of claim 1, further comprising: detecting signal code information by applying a related parameter for detecting and determining a CCT signal code using a DFT calculation result when it is determined as a CCT function in the fifth step. Multichannel R2MFC / DTMF / CCT combined receiving method. The information area of the input / output memory (2) is composed of data in units of 1 byte, and bit 1 and bit 0 for displaying three functional mode information of R2MFXC, DTMF, and CCT for each channel. Multi-channel R2MFC / DTMF / CCT combined receiving method characterized in that represented by a combination of two bits represented by. 5. The method according to claim 4, wherein the bits D7 and D6 indicate first function mode information, and the bits D5 and D4 correspond to the function of the second channel according to the channel order performed in the digital signal processor 5 in the data of one byte unit. The method according to claim 2, wherein the mode information and the remaining bits indicate sequential channel-specific function mode information. The multi-channel R2MFC / DTMF / CCT combined receiving method according to claim 1, wherein the receiving area of the input / output device (2) is composed of data in units of 1 byte. The method of claim 6, wherein the D0 to D3 bits indicate received and detected signal information in the 1-byte data, the D4 bit indicates the meaning of the received and detected signal information, and the D5 to D7 bits are received in the DTMF function mode. Indicate whether the detected signal information is new data, indicate the direction of the signal information in the R2MFC function mode, and indicate whether the received signal information is valid in the CCT function mode. CCT combined receiving method. ※ Note: The disclosure is based on the initial application.