KR920009782B1

KR920009782B1 - Voice quality evaluation system

Info

Publication number: KR920009782B1
Application number: KR1019900008024A
Authority: KR
Inventors: 강성훈
Original assignee: 한국전기통신공사; 이해욱; 재단법인 한국전자통신연구소; 경상현
Priority date: 1990-05-31
Filing date: 1990-05-31
Publication date: 1992-10-22
Also published as: KR910021087A

Abstract

The audio quality test system utilizes digital filters to simulate characteristics of exchange and network. An additional noise generator, four line telephone, and echo path are employed to simulate long distance network. The test system includes first and a second four line telephone (1,11) for simulating telephone characteristics, a first power supply (2) for supplying power to the first four line telephone, a second power supply (10) for supplying power to the second four line telephone, a first and a second network simulators (5,7) for simulating network, a first and a second echo generator (15) for simulating network echo effect, and a noise generator (6) for providing noise to the first and the second network simulaotrs.

Description

Voice Quality Evaluation System

제1도는 본 발명에 의한 음성품질 시스템의 구성을 나타낸 블럭도.1 is a block diagram showing the configuration of a voice quality system according to the present invention.

제2도는 제1도의 실내소음발생부의 세부 구성 블럭도.2 is a detailed block diagram of the indoor noise generator of FIG.

제3도는 제1도의 전류공급회로의 세부 구성 블럭도.3 is a detailed block diagram of the current supply circuit of FIG.

제4도는 제1도의 전송망 모의회로부의 세부 구성 블럭도.4 is a detailed block diagram of the transmission network simulation circuit of FIG.

제5도는 제1도의 잡음발생부의 세부 구성 블럭도.5 is a detailed block diagram of the noise generator of FIG.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for the main parts of the drawings

1 : 제1사선식 전화기 2 : 제1전류공급회로1: first wire telephone 2: 1st current supply circuit

3 : 제2음성지연 증폭기 4 : 제2지연기3: second speech delay amplifier 4: second delay

5 : 제1전송망 모의회로부 6 : 잡음발생부5: first transmission network simulation circuit 6: noise generator

7 : 제2전송망 모의회로부 8 : 제1지연기7: second transmission network simulation circuit 8: first delay unit

9 : 제1음성지연 증폭기 10 : 제2전류공급회로9: first voice delay amplifier 10: second current supply circuit

11 : 제2사선식 전화기 12 : 실내소음발생부11: second two-wire telephone 12: indoor noise generator

14 : 제2에코발생부 15 : 제1에코발생부14: second echo generator 15: first echo generator

21 : 발진기 22 : 레귤레이터21: oscillator 22: regulator

23 : 저역통과필터 24 : -5dB/Oct 필터23: Low pass filter 24: -5dB / Oct filter

25 : 스피커 31 : 피딩브릿지25: speaker 31: feeding bridge

32 : 의사선로 33 : 전원공급기32: pseudo line 33: power supply

41 : 제1감쇠부 42 : 디지틀 필터부41: first attenuation portion 42: digital filter portion

43 : 증폭부 44 : 제2감쇠부43: amplification section 44: second attenuation section

45 : 하이브리드회로부 51 : 발진기45: hybrid circuit part 51: the oscillator

52 : 레귤레이터 53 : 저역통과필터52: regulator 53: low pass filter

54 : -8dB/Oct 필터54: -8dB / Oct Filter

본 발명은 통신기기의 음성품질 평가에 이용되는 음성품질 평가 시스템에 관한 것이다.The present invention relates to a voice quality evaluation system used for voice quality evaluation of a communication device.

종래의 음성품질 평가 시스템의 전송망 모의회로는 구성 요소가 수동소자를 이용한 아날로그 방식으로 구성되어 있기 때문에 교환기나 전송망의 특성을 충분히 모의하기가 곤란하고 자체 특성을 임의로 가변시키기 곤란한 문제점이 있었다.The transmission network simulation circuit of the conventional voice quality evaluation system has a problem that it is difficult to sufficiently simulate the characteristics of an exchange or a transmission network because the components are configured in an analog manner using passive elements, and it is difficult to arbitrarily change its own characteristics.

따라서 본 발명은 상기 문제점를 개선하기 위해 안출된 것으로 디지틀 필터를 사용하여 교환기 및 전송망 특성을 정확히 나타낼 수 있는 전송망 모의회로를 제공하고 전송망 모의회로를 국선잡음과 회선잡음을 가변할 수 있는 잡음발생부와 에코경로를 추가하여 시외회선의 모의회로를 제공하여 시외회선 모의회로부에 사선식 전화기와 실내소음발생부를 추가하는 음성품질 평가 시스템을 제공하는 데 그 목적이 있다.Accordingly, the present invention provides a transmission network simulation circuit that can accurately represent the switching and transmission network characteristics by using a digital filter, and the noise generation unit that can vary the line noise and line noise with the transmission network simulation circuit. The purpose is to provide a voice quality evaluation system that adds a four-line telephone and an indoor noise generator to the long distance circuit simulation circuit by adding an echo path.

상기 목적을 달성하기 위해 본 발명은 전화기 특성을 모의하는 제1 및 제2사선식 전화기, 상기 제1사선식 전화기에 연결되어 상기 제1사선식 전화기에 전류를 공급하는 제1전류공급수단, 상기 제2사선식 전화기에 연결되어 상기 제2사선식 전화기에 전류를 공급하는 제2전류공급수단, 상기 제1 및 제2전류공급수단에 각각 연결되어 전송망의 특성을 모의하는 제1 및 제2전송망 모의수단, 상기 제1전송망 모의수단에 입력단이 연결되고 제2전송망 모의수단에 출력단이 여결되어 송화자에게 에코음을 제공하는 제1에코발생수단, 상기 제2전송망 모의수단에 입력단이 연결되고 상기 제1전송망 모의수단에 출력단이 연결되어 송화자에게 에코음을 제공하는 제2에코발생수단, 및 상기 제1 및 제2전송망 모의수단에 연결되어 회선잡음과 국선잡음을 발생시켜 상기 제1 및 제2전송망 모의수단에 공급하는 잡음발생수단으로 구성되어 있는 것을 특징으로 한다In order to achieve the above object, the present invention provides a first and a second four-wire telephone to simulate the characteristics of the phone, the first current supply means for supplying current to the first four-wire telephone, the first Second current supply means connected to a second wire telephone to supply current to the second wire telephone, and first and second transmission networks respectively connected to the first and second current supply means to simulate characteristics of a transmission network. An input terminal connected to the simulation means, the first transmission network simulation means, an output end coupled to the second transmission network simulation means, and providing an echo sound to a caller; an input end connected to the second transmission network simulation means, A second echo generating means connected to the first transmission network simulation means to provide an echo sound to the caller, and connected to the first and second transmission network simulation means to generate line noise and trunk noise; And noise generating means for supplying the first and second transmission network simulation means.

이하, 첨부한 도면을 참조하여 본 발명의 일실시예를 상세히 설명한다.Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention;

제1도는 본 발명에 의한 음성품질 평가 시스템의 구성을 나타낸 블럭도, 제2도는 제1도의 실내소음발생부의 세부 구성 블럭도, 제3도는 제1도의 전류공급회로의 세부 구성 블럭도, 제4도는 제1도의 전송망 모의회로부의 세부 구성 블럭도 제5도는 제1도의 잡음발생부와 세부 구성 블럭도이다. 상기 도면에서 1은 제1사선식 전화기, 2는 1전류공급회로, 3은 제2음성지연 증폭기, 4는 제2지연기, 5는 제1전송망 모의회로부, 6은 잡음발생부, 7은 제2전송망 모의회로부, 8은 제1지연기, 9는 제1음성지연 증폭기, 10은 제2전류공급회로, 11은 제2사선식 전화기, 12는 실내소음발생부, 14는 제2에코발생부, 15는 제1에코발생부, 21은 발진기, 22는 레귤레이터, 23은 저역통과필터, 25는 -5dB/Oct 필터, 25는 스피커, 31은 피딩브릿지, 32는 의사선로, 33은 전원공급기, 41는 제1감쇠부, 42는 디지틀 필터부, 43은 증폭부, 44는 제2감쇠부, 45는 하이브리드 회로부, 51은 발진기, 52는 레귤레이터, 53은 지역통과필터, 54는 -8dB/Oct 필터를 각각 나타낸다.1 is a block diagram showing the configuration of the voice quality evaluation system according to the present invention, FIG. 2 is a detailed block diagram of the indoor noise generator of FIG. 1, FIG. 3 is a detailed block diagram of the current supply circuit of FIG. FIG. 1 is a detailed block diagram of the transmission network simulation circuit of FIG. 1; FIG. In the figure, 1 is a first wire telephone, 2 is a current supply circuit, 3 is a second voice delay amplifier, 4 is a second delay unit, 5 is a first transmission network simulation circuit, 6 is a noise generator, and 7 is 2 transmission network simulation circuit, 8 is the first delay unit, 9 is the first audio delay amplifier, 10 is the second current supply circuit, 11 is the second diagonal telephone, 12 is the indoor noise generator, 14 is the second echo generator 15 is the first echo generator, 21 is oscillator, 22 is regulator, 23 is low pass filter, 25 is -5dB / Oct filter, 25 is speaker, 31 is feeding bridge, 32 is pseudo line, 33 is power supply, 41 is the first attenuation part, 42 is the digital filter part, 43 is the amplification part, 44 is the second attenuation part, 45 is the hybrid circuit part, 51 is the oscillator, 52 is the regulator, 53 is the regional pass filter, and 54 is -8 dB / Oct. Each filter is shown.

본 발명에 의한 음성품질 평가 시스템은 제1도에 도시한 바와 같이 제1사선식 전화기(1), 제1전류공급회로(2), 제2음성지연 증폭기(3) 및 제2지연기(4)로 구성되는 제2에코발생부(14), 제1전송망 모의회로부(5), 잡음발생부(6), 제2전송망 모의회로부(7), 제1지연기(80) 및 제1음성지연 증폭기(9)로 구성하는 제1에코발생부(15), 제2전류공급회로(10), 제2사선식 전화기(11), 및 실내소음발생부(22)로 구성되어 있다.As shown in FIG. 1, the voice quality evaluation system according to the present invention includes a first diagonal telephone 1, a first current supply circuit 2, a second voice delay amplifier 3, and a second delay unit 4; A second echo generator 14, a first transmission network simulation circuit 5, a noise generator 6, a second transmission network simulation circuit 7, a first delay unit 80, and a first voice delay A first echo generator 15, a second current supply circuit 10, a second four-wire telephone 11, and an indoor noise generator 22 constituted of an amplifier 9.

상기 제1 및 제2사선식 전화기(1,11)는 전화기의 특성을 모의하는 기능을 하며 송화레벨과 수화레벨을 가변할 수 있도록 되어 있고 축음특성도 가변할 수 있도록 2대의 전화기로 구성하고 송·수화음성을 테이프 레코더에 녹음할 수 있고 음성품질 평가 시스템의 단말기 역할을 한다.The first and second four-wire telephones (1, 11) function to simulate the characteristics of the telephone, and are made up of two telephones so that the talk level and the sign language level can be varied and the phonograph characteristics can be varied. · You can record the sign language on a tape recorder and act as a terminal for the voice quality evaluation system

상기 제1 및 제2전류공급회로(2,10)는 제1 및 제2사선식 전화기(1,11)에 전류를 공급하는 기능을 하며 제3도에 도시한 바와 같이 의사선로(32), 피딩 브릿지(31), 및 전원공급기(33)로 구성되어 있다.The first and second current supply circuits 2 and 10 function to supply current to the first and second diagonal telephones 1 and 11, and the pseudo line 32, as shown in FIG. It is composed of a feeding bridge 31, and a power supply 33.

상기 피딩 브릿지(31)는 상기 전원공급(33)로부터 전류를 제1 및 제2사선식 전화기(1,11)로 공급하고 제1 및 제2전송망 모의회로부(5,7)에는 제1 및 제2사선식 전화기(1,11)에서 송화된 음성만 공급되도록 하는 역할을 한다. 상기 의사선로(32)는 가입자 선로를 시뮬레이션하여 만든 선로로서 0dB에서 15dB까지 가변할 수 있도록 구성되어 있다.The feeding bridge 31 supplies current from the power supply 33 to the first and second diagonal telephones 1 and 11, and the first and second transmission network simulation circuits 5 and 7 to the first and second. The two-wire telephone (1,11) serves to supply only the voice transmitted. The pseudo line 32 is a line made by simulating a subscriber line and is configured to vary from 0 dB to 15 dB.

상기 제1 및 제2전송망 모의회로부(5,7)는 상기 제1 및 제2전류공급회로(2,10)에 연결되어 전송망이 특성을 모의하며 제4도에 도시한 바와 같이 제1감쇠부(41), 디지틀 필터부(42), 증폭부(43), 제2감쇠부(44), 및 하이브리드 회로부(45)로 구성되어 있다.The first and second transmission network simulation circuits 5 and 7 are connected to the first and second current supply circuits 2 and 10 to simulate the characteristics of the transmission network, and as shown in FIG. (41), the digital filter section 42, the amplifier section 43, the second attenuation section 44, and the hybrid circuit section 45.

상기 제1감쇠부(41)는 상기 사선식 전화기(1,11)에서 송화된 음성의 크기를 가변시키고 전송망의 손실을 모의하고 상기 디지틀 필터부(42)에 적절한 임력레벨을 설정하는 역할을 한다.The first attenuation unit 41 serves to vary the size of the voice transmitted by the four-wire telephones 1 and 11, simulate the loss of the transmission network, and set an appropriate hierarchical level to the digital filter unit 42. .

상기 디지틀 필터부(42)는 300Hz 내지 3,400Hz 대역의 음성만을 통과시키는 기능을 갖는 교환기의 전송특성을 모의하고 음성통과 대역과 통과대역의 주파수 특성을 임의로 가변하는 역할을 한다.The digital filter unit 42 simulates transmission characteristics of an exchange having a function of passing only voices in the 300 Hz to 3,400 Hz band and arbitrarily varies the frequency characteristics of the voice pass band and the pass band.

상기 증폭부(43)는 상기 사선식 전화가(1,11)에서 송화되어 상기 제1감쇠부(41)와 디지틀 필터부(42)를 통과한 음성을 증폭시키는 교환기의 증폭기 역할을 한다.The amplifier 43 serves as an amplifier of an exchanger that amplifies the voice that is transmitted from the four-wire telephones 1 and 11 and passed through the first attenuator 41 and the digital filter unit 42.

상기 제2감쇠부(44)는 상기 증폭부(43)를 통과한 음성의 크기를 가변시키는 상기 제1감쇠부(41)와 동일한 역할을 하고 상기 제1감쇠부(41)와 제2감쇠부(44)를 조합하여 손실을 모의하는 역할을 한다.The second attenuation part 44 plays the same role as the first attenuation part 41 for varying the volume of the voice passing through the amplification part 43 and the first attenuation part 41 and the second attenuation part. Combine (44) to simulate losses.

상기 하이브리드 회로부(45)는 상기 제2감쇠부(44)에 연결되어 국선잡음과 회선잡음을 음성신호에 혼합시키는 기능을 한다.The hybrid circuit part 45 is connected to the second attenuation part 44 and functions to mix trunk line noise and line noise with a voice signal.

상기 제1 및 제2지연기(4,8)는 송화자 에코경로를 형성하는 기능을 하며 제1 및 제2전송망 모의회로부(5,7)를 통과한 음성신호에 대해 송화자에게 에코를 제공하기 위한 에코경로를 형성하고 에코지연 시가을 0ms에서 1200ms까지 1ms씩 가변할 수 있도록 되어 있다.The first and second delayers 4 and 8 function to form a caller echo path and to provide an echo to the talker for the voice signal passing through the first and second transmission network simulation circuits 5 and 7. The echo path is formed and the echo delay time can be varied by 1 ms from 0 ms to 1200 ms.

상기 제1 및 제2음성지연 증폭기(3,9)는 상기 제1 및 제2지연기(4,8)에서 형성된 에코음을 증폭시키는 기능을 한다.The first and second voice delay amplifiers 3 and 9 function to amplify echo sounds formed by the first and second delay units 4 and 8.

상기 잡음발생부(6)는 회선잡음과 국선잡음을 발생시켜 상기 제1 및 제2전송망 모의회로부(5,7)에서 잡음을 공급하는 기능을 하며 제5도에 도시한 바와 같이 발진기(51), 레귤레이터(52), 저역통과필터(53), -8dB/Oct 필터(54)는 구성되어 있다.The noise generator 6 generates line noise and trunk line noise to supply noise from the first and second transmission network simulation circuits 5 and 7, and the oscillator 51 as shown in FIG. The regulator 52, the low pass filter 53, and the -8dB / Oct filter 54 are configured.

상기 발진기(51)는 랜덤노이즈를 발생시키는 기능을 하며 상기 잡음발생부(6)의 원점이다. 상기 레귤레이터(52)는 상기 발진기(51)에 연결되어 랜덤노이즈의 출력레벨을 항상 일정하게 하는 안정화 기능을 하고 상기 저역통과필터(53)는 상기 레귤레이터(52)에 연결되어 20KHz 이하의 오디오 대역의 노이즈만을 통과시키고 평탄한 스팩트럼을 출력하며 시외회선의 국선잡음을 모의하는 역할을 한다.The oscillator 51 functions to generate random noise and is the origin of the noise generator 6. The regulator 52 is connected to the oscillator 51 to stabilize the output level of random noise at all times, and the low pass filter 53 is connected to the regulator 52 and has an audio band of 20 kHz or less. It only passes noise, outputs a flat spectrum, and simulates trunk noise of long distance lines.

상기 저역통과필터(53)에 연결된 -8dB/Oct 필터부(54)는 상기 저역통과필터(53)를 통과한 노이즈를 옥타브당 -8dB씩 감쇠시키고 시외회선의 회선잡음을 모의하는 역할을 한다.The -8 dB / Oct filter unit 54 connected to the low pass filter 53 attenuates the noise passing through the low pass filter 53 by -8 dB per octave and simulates line noise of the long distance line.

상기 실내소음발생부(12)는 제1 및 제2사선식 전화기(1,11)에 실내소음을 발생시켜 송·수화자의 전화사용 환경을 소음레벨을 가변하면서 모의하는 것으로 제2도에 도시한 바와 같이 발진지(21), 레귤레이터(22), 저역통과필터(23), -5dB/Oct 필터(24), 및 스피커(25)로 구성되어 있다.The indoor noise generator 12 generates indoor noise in the first and second four-wire telephones 1 and 11 to simulate the telephone use environment of the sender and the receiver while varying the noise level. The oscillation paper 21, the regulator 22, the low pass filter 23, the -5dB / Oct filter 24, and the speaker 25 are comprised as mentioned above.

상기 발진기(21)는 랜덤 노이즈를 발생시키는 기능을 하며 실내소음발생부(12)의 원점이다. 상기 레귤레이터(22)는 상기 발진기(21)에 연결되어 랜덤노이즈의 출력레벨을 항상 일정하게 하는 안정화 기능을 한다.The oscillator 21 functions to generate random noise and is the origin of the indoor noise generator 12. The regulator 22 is connected to the oscillator 21 and functions to stabilize the output level of random noise at all times.

상기 저역통과필터(23)는 상기 레귤레이터에 연결되어 20KHz 이하의 오디오 대역의 노이즈만 통과시키는 기능을 한다. 상기 -5dB/Oct 필터(24)는 상기 저역통과필터(23)에 연결되어 상기 20KHz 저역통과필터(23)를 통과한 노이즈를 옥타브당 -5dB씩 감쇠시켜 상기 스피커로 출력하는 기능을 함으로써 실내소음을 모의하는역할을 한다.The low pass filter 23 is connected to the regulator and functions to pass only noise of an audio band of 20 KHz or less. The -5 dB / Oct filter 24 is connected to the low pass filter 23 to attenuate the noise passing through the 20 KHz low pass filter 23 by -5 dB per octave to output to the speaker. It acts to simulate

상기와 같이 구성되어 작동하는 본 발명은 통신망의 전송특성을 실험실내에서 정확히 모의할 수 있고 다양한 전송특성을 용이하게 가변할 수 있어 실험실에서 전송특성에 대한 품질평가를 손쉽게 할 수 있는 효과가 있다.The present invention configured and operated as described above can accurately simulate the transmission characteristics of a communication network in a laboratory and can easily change various transmission characteristics, thereby making it easy to evaluate the quality of transmission characteristics in a laboratory.

Claims

First current supply means for supplying current to the first four-wire telephone 1 connected to the first and second four-wire telephones 1 and 11 and the first four-wire telephone 1 simulating a telephone characteristic. (2), second current supply means (10) connected to the second wire telephone (11) for supplying current to the second wire telephone (11), and the first and second current supply means (2). Input terminals are connected to the first and second transmission network simulation means (5,7), the first transmission network simulation means (5), respectively, and the output terminal is connected to the second transmission network simulation means (7). An input terminal is connected to the first echo generating means 15 and the second transmission network simulation means 7 that is connected to provide an echo sound to the talker, and an output terminal is connected to the first transmission network simulation means 5 to echo the sound to the talker. Connected to the second echo generating means 14 and the first and second transmission network simulation means 5 and 7 to generate line noise and trunk line noise. Speech quality assessment system, characterized in that it is configured with the first and noise generating means (6) for supplying to the second transmission network simulation means (5, 7).

The indoor noise generator (12) according to claim 1, further comprising an indoor noise generator (12) for generating indoor noise in the first and second oblique telephones (1, 11) to simulate the telephone use environment of the sender and the receiver with varying noise levels. Voice quality evaluation system characterized in that.

2. The power supply means (33) according to claim 1, wherein the first and second current supply means (2, 10) are connected to a power supply means (33) for supplying power and the power supply means (33) from Current is supplied to the first and second four-wire telephones 1, 11 and voices transmitted from the first and second four-wire telephones 1, 11 are simulated by the first and second transmission network 5, 7) and a pseudo line 32 connected to the feeding bridge means 31 and a pseudo line 32 made by simulating a subscriber line that can vary from 0 dB to 15 dB. Voice Quality Evaluation System.

2. The speech delay amplification device according to claim 1, wherein the first and second echo generating means (14, 15) are delay means for forming a transmitter echo path, and a voice delay amplification connected to the delay means to amplify echo sound formed by the delay means. Voice quality evaluation system, characterized in that consisting of means.

2. The first and second transmission network simulation means (5, 7) according to claim 1, characterized in that the first attenuation means (41), the first attenuation means for attenuating the loss of the transmission path by attenuating the voice signal transmitted from the telephone Digital filter means (42) connected to (41) to simulate transmission characteristics of the exchanger; amplification means (43) connected to the digital filter means (42) to amplify a signal passing through the filter; A second attenuating means 44 connected to the attenuating voice signal to simulate a loss of a transmission path, and a hybrid circuit means 45 connected to the second attenuating means 44 for mixing trunk line noise and line noise in a transmission network. Voice quality evaluation system, characterized in that consisting of.

The noise generating means (6) according to claim 1, wherein the noise generating means (6) is connected to the oscillating means (51) for generating random noise, and the oscillating means (51), and the regulator means (52) to constantly stabilize the output level of the random noise. Low pass filter means 53 connected to the regulator means 52 for outputting a flat spectrum by simulating only noise of an audio band of 20 KHz or less, and simulating trunk line noise of an intercity line, and the low pass filter means 53. Voice quality, characterized in that it is composed of -8dB / Oct filter means 54 to attenuate -8dB per octade of noise passing through the low pass filter means 53 and to simulate the line noise of the long-distance line. Evaluation system.

The apparatus of claim 2, wherein the indoor noise generator (12) is connected to the oscillation means (21) for generating random noise and the oscillation means (21) to stabilize the output level of the random noise at all times. 22), the low pass filter means 23, which is connected to the regulator means 22 and passes only noise of an audio band of 20 KHz or less, and the low pass filter means 23, which is connected to the low pass filter means 23, -5dB / Oct filter means (24) for attenuating the passed noise by -5dB per octave, and a speaker (25) connected to the -5dB / Oct filter means (24).