KR100222794B1 - Voice communication apparatus for suppressing noise leakage in line - Google Patents

Abstract

end. The technical field to which the invention described in the claims belongs:

It relates to a voice communication device.

I. The technical problem the invention is trying to solve:

The present invention provides a voice communication apparatus for suppressing noise induction on a line to reduce noise organicity on a line by performing time division modulation and demodulation on the analog voice data, and compressing / extending and demodulating the data.

All. The gist of the solution of the invention:

A voice communication device connected to an analog network is in charge of a common memory for storing transmission and reception data, and controls voice communication, accesses the common memory and outputs the transmission data to a demodulation unit, and outputs the received data from the modulation and demodulation unit. A control unit for inputting and outputting to the common memory, a digital processing unit for voice-compressing and transmitting the transmission data to the common memory, inputting and expanding the received data of the common memory, and the transmission data from a handset or a microphone. Is converted to digital and output to the digital processing unit, and converts the received data from the digital processing unit into an analog and outputs to the handset or a speaker.

la. Important uses of the invention:

This is implemented to reduce noise induced on the line of the analog network.

Description

VOICE COMMUNICATION APPARATUS FOR SUPPRESSING NOISE LEAKAGE IN LINE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a voice communication device, and more particularly, to an apparatus for suppressing organic noise on a line by converting an analog voice signal into a digital signal and then compressing and transmitting the digital voice signal.

Typically, a terminal related to voice communication is connected to an analog network or a digital line. First, the terminal connected to the analog network transmits the analog voice signal input from the handset or the microphone to an appropriate form by changing the level to an appropriate form, and the received analog signal is received through impedance matching and then restored by the appropriate method. Or speaker output.

Second, the terminal connected to the digital line is used to sample the analog voice signal input from the handset or microphone at 8KHz, convert it to time division modulation, that is, PCM voice data, and transmit it to the other party at the rate of 64KBPS. . The receiving side restores the time division demodulated analog voice signal and outputs it through the handset or the speaker.

On the other hand, since the voice communication terminal connected to the conventional analog transmission line transmits the user's voice as an analog voice signal, when a momentary noise or the like is applied to the transmission line, the effect of the instantaneous noise is immediately applied to the receiving side without filtering at the receiving terminal. To be delivered to. That is, during voice transmission through the analog line of the PSTN, which is a general communication network, the analog voice signal is deteriorated due to various noises induced in the line. In addition, the induced noise is output directly to the other handset or speaker.

As a result, voice data is deteriorated due to various noises inherent in a line during voice transmission through an analog line of a general communication network, PSTN. In addition, the induced noise is output to the other handset or speaker.

As described above, the conventional problem is that the noise induced in the transmission path of the analog network cannot be reduced in the terminal.

Accordingly, an object of the present invention is to provide a voice communication device that is very resistant to noise on the line by transmitting / receiving time division modulation and demodulation of an analog voice signal, and transmitting / receiving and demodulating the analog voice signal.

1 is a block diagram illustrating a voice communication device for suppressing noise induced on a line according to an exemplary embodiment of the present disclosure.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that like elements in the figures represent like reference numerals wherever possible.

The present invention samples and digitizes an analog voice signal input from a handset or microphone. In this case, the time division modulation such as PCM data conversion or the like is used. On the other hand, in order to transmit the digital voice data through the analog transmission line, the modem must have a transmission speed of 64kbps. However, the actual modem's baud rate typically does not have a baud rate of 64 kbps. Therefore, the present invention performs data compression to reduce the amount of transmission of the digitally converted voice data. In this case, the compression may be a technique such as CELP, ADPCM. In addition, the modulator / demodulator modulates the voice data in order to transmit the compressed digital voice data to the analog transmission line in the present invention. At this time, the modulator / demodulator may use a commercial modem chip set. The receiving voice communication device performs demodulation on the input signal and converts the received signal into digital data in the reverse order of the above-described operation of the transmitting side, and subsequently performs decompression, time division demodulation, and analog conversion to restore the original signal. do.

As described above, it can be seen that the present invention converts an analog audio signal into digital data and transmits it, so that the receiving voice communication device can perform predetermined processing such as an error check on the received digital signal. For example, sampling of a speech signal is generally performed in units of 125 microseconds. However, the above sampling unit is enough for a user to make a general call. However, at this time, the voice communication apparatus according to an embodiment of the present invention checks the error of the received digital voice data and if the error is above the set level, the voice communication apparatus discards the received digital voice data and before that If the received and stored digital voice data is presented to the receiving user, the voice communication device can be implemented to be very resistant to noise induced from the transmission line.

1 is a block diagram illustrating a voice communication device for suppressing noise induced on a line according to an exemplary embodiment of the present disclosure. Hereinafter will be described in detail with reference to FIG.

The circuit matching unit 12 is interfaced with an analog network of the PSTN, which is a general public network. The demodulation unit 14 performs a modulation / demodulation function to transmit / receive digitally converted transmission / reception data through the analog network. Here, the modulation and demodulation unit 14 has a speed of 9600 BPS, 14400 BPS, 19200 BPS, 28800 BPS, and the like. The micro processor unit 16 (hereinafter referred to as MPU) 16 performs overall control processing for voice communication and includes a program memory and a data memory. That is, the memory 18 is implemented as the program memory and the data memory, and the program memory is nonvolatile and stores a program for voice communication in a unit set and a digital data frame transmission unit. At this time, each frame is provided with an extra bit for error checking.

Data generated during the voice communication service is stored in the data memory. And the connection between the demodulation unit 14 and the MPU 16 is made in a parallel bus method or a serial method. The common memory 20 performs communication between the MPU 16 and a digital signal processor 22 (hereinafter, referred to as a DSP). That is, the MPU 16 accesses the common memory 20 to output transmission data to the modulator 14, and outputs and stores the received data from the modulator 14 to the common memory 20. The DSP 22 includes a memory 24 to compress and decompress the transmitted / received data. The DSP 22 inputs the transmission data from the following codec 26 to compress the voice and outputs the compressed data to the common memory 20. The DSP 22 inputs the received data from the common memory 20 to expand the voice and outputs the received data to the codec 26. do. The codec 26 digitally converts and transmits the transmission data from the handset or the microphone, and converts the received data into analog and outputs the analog data to the handset or the speaker.

As described above, there is an advantage in that a voice communication device that is very resistant to noise induced in an analog network may be implemented when time division and conversion of voice data is performed.

Claims (2)

In a voice communication device, Circuit matching means for interfacing with an analog network; Modulation and demodulation means connected to said line matching means for modulating and demodulating transmission / reception data; A common memory for storing the transmission / reception data; Control means for controlling voice communication, accessing the common memory to output the transmission data to the demodulation means, and inputting the received data from the modulation and demodulation means to the common memory; Digital processing means for speech-compressing the transmission data and outputting the speech data to the common memory and inputting and receiving the received data of the common memory; And a codec for converting the transmission data from the handset or the microphone into digital and outputting the digital data to the digital processing means, and converting the received data from the digital processing means into analog and outputting the analog data to the handset or the speaker. Voice communication device for noise suppression on line. In a voice communication device, A codec for converting an analog voice signal of a transmitting user into digital data and converting an input signal into an analog voice signal and hearing it to the transmitting user; A digital signal processor for compressing the voice digital data and performing extension on the input signal to output the codec to the codec; And a modulator / demodulator for analog-modulating the compressed voice data and transmitting the analog voice to an analog transmission line through a line matching unit, and digitally demodulating the signal received from the analog transmission line to the digital signal processor. Device.