KR0157551B1 - Automatic sound intermediate frequency selection apparatus - Google Patents
Automatic sound intermediate frequency selection apparatusInfo
- Publication number
- KR0157551B1 KR0157551B1 KR1019950015265A KR19950015265A KR0157551B1 KR 0157551 B1 KR0157551 B1 KR 0157551B1 KR 1019950015265 A KR1019950015265 A KR 1019950015265A KR 19950015265 A KR19950015265 A KR 19950015265A KR 0157551 B1 KR0157551 B1 KR 0157551B1
- Authority
- KR
- South Korea
- Prior art keywords
- signal
- intermediate frequency
- mhz
- sif
- unit
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/60—Receiver circuitry for the reception of television signals according to analogue transmission standards for the sound signals
- H04N5/602—Receiver circuitry for the reception of television signals according to analogue transmission standards for the sound signals for digital sound signals
- H04N5/605—Receiver circuitry for the reception of television signals according to analogue transmission standards for the sound signals for digital sound signals according to the NICAM system
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G5/00—Tone control or bandwidth control in amplifiers
- H03G5/16—Automatic control
- H03G5/24—Automatic control in frequency-selective amplifiers
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Television Receiver Circuits (AREA)
Abstract
본 발명은 멀티시스템을 채용한 AV기기에 관한 것으로, 입력되는 음성주파수를 자동으로 조절하는 자동 음성중간주파수(SIF) 선택장치에 관한 것이다. 그러므로, 방송방식의 정확한 판별에 의해 입력되는 주파수신호에 해당하는 필터부의 출력신호를 제어부에서 자동으로 선택하여 줌으로써 사용자가 일일이 시스템을 조작했던 종래에 비해 자동으로 시스템이 선택되므로 AV기기의 조작이 더욱 간편해지는 효과를 제공한다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an AV device employing a multi-system, and more particularly, to an automatic voice intermediate frequency (SIF) selection device for automatically adjusting an input voice frequency. Therefore, the control unit automatically selects the output signal of the filter unit corresponding to the frequency signal inputted by the accurate determination of the broadcasting method, so that the system is automatically selected as compared to the conventional system in which the user operates the system. Provides the effect of simplicity.
Description
제1도는 종래의 음성중간주파수 선택장치를 도시한 구성도.1 is a block diagram showing a conventional voice intermediate frequency selection device.
제2도는 주파수대역에 따른 이득을 나타낸 개념도.2 is a conceptual diagram showing gain according to a frequency band.
제3도는 본 발명의 바람직한 일 실시예에 따른 자동 음성중간주파수 선택장치를 나타내는 구성도.3 is a block diagram showing an automatic voice intermediate frequency selection device according to an embodiment of the present invention.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
10 : 필터링수단 11 : 5.5㎒필터부10 filtering means 11: 5.5 MHz filter unit
13 : 6.0㎒필터부 15 : 6.5㎒필터부13: 6.0 MHz filter unit 15: 6.5 MHz filter unit
31 : NICAM부 33 : 제어부31: NICAM unit 33: control unit
35 : 스위칭부35: switching unit
본 발명은 멀티시스템을 채용한 오디오/비데오(A/V)기기에 관한 것으로, 특히 입력되는 음성주파수를 자동으로 선택하는 자동 음성중간주파수(SIF) 선택장치에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to audio / video (A / V) equipment employing a multi-system, and more particularly, to an automatic voice intermediate frequency (SIF) selection device for automatically selecting an input voice frequency.
일반적으로 음성다중방송이란 TV 방송의 음성전파에 또다른 음성신호를 중첩해서 동시에 방송하는 것으로, 스테레오방송이나 2개국어 방송이 동시에 가능한 시스템이다. 음성다중방송에는 기존의 음성반송파 외에 제2음성반송파를 마련하는 방식인 2중캐리어시스템(Dual Carrier System)과, 부음성으로 변조된 부반송파를 기존의 음성반송파에 다중변조하는 방식인 서브캐리어시스템(Subcarrier System)으로 크게 분류된다. 이것을 다시 세분하면 아날로그 방식은 2캐리어(Carrier)방식, 진폭변도(AM-AM)방식, 주파수 변조(FM-FM)방식과 디피에스케이(DPSK)에 의한 디지탈방식이 있다.In general, voice multicasting is a system in which another voice signal is superimposed simultaneously on a sound wave of a TV broadcast, and a stereo broadcast or a bilingual broadcast is possible at the same time. In voice multicasting, a dual carrier system, which is a method of providing a second voice carrier in addition to the existing voice carrier, and a subcarrier system, which is a method of multimodulating a subcarrier modulated by a negative voice to an existing voice carrier ( Subcarrier System). Subdivided into these two types, analog systems are two carrier, amplitude-variable (AM-AM), frequency-modulated (FM-FM), and digital by DPSK.
디지탈방식에서 UK방식(Ⅰ 방식)음성다중이나 스칸디나비아방식(또는 스웨덴방식, B/G방식)음성다중은, Ⅰ, B/G TV변조방식에 새롭게 제2캐리어를 부가한 방식이다. 이는 2계통의 음성 및 데이터 신호를 디지털화한 것으로, UK방식은 6.552㎒의 제2캐리어를, 스칸디나비아방식은 5.85㎒의 제2캐리어를 4상DPSK(QPSK;Quadrature Phase Shift Keying) 변조하여 송신하는 방식이며, 이는 NICAM(Near Instantaneous Companded Audio Multiplex)방식이라고도 불린다. 각 나라별 TV시스템을 다음의 참고를 통하여 간단히 비교하겠다.In the digital system, the UK (I) voice multiple or Scandinavian (or Swedish, B / G) voice multiple is a system in which a second carrier is newly added to the I and B / G TV modulation systems. This system is a digitized system of two voice and data signals. The UK method transmits a second carrier of 6.552 MHz and the second carrier of 5.85 MHz by modulating a quadrature phase shift keying (DPSK). This is also called NICAM (Near Instantaneous Companded Audio Multiplex). We will briefly compare each country's TV system with the following references.
이러한 디지탈방식의 멀티시스템을 적용한 칼라TV 또는 VCR에서 NICAM신호에 의한 TV수상기의 특유한 잡음인 음성 버즈음(buzz)을 배제하는데 필요한 음성중간주파수 선택은 지금까지는 사용자가 시스템을 선택하여 수동으로 선택하여 사용하여야 했다.In the color TV or VCR adopting such a digital multi-system, the selection of the voice intermediate frequency required to exclude the voice buzz, which is a unique noise of the TV receiver by the NICAM signal, has been performed by the user by manually selecting the system. Had to be used.
제1도는 종래의 음성중간주파수 선택장치를 도시한 구성도이다. 종래의 음성중간주파수 선택장치는 3개의 필터부로 구성된 필터링수단(10)과 필터링수단(10)의 출력신호를 인가받아 변환하는 500㎑변환기(20)로 구성된다.필터링수단(10)은 각각 0.5㎒ 즉, 500㎑가 차이가 나도록 5.5㎒필터부(11), 6.0㎒필터부(13), 6.5㎒필터부(15)의 3필터부로 구성된다. 이 각각의 필터부의 후단에 연결된 500㎑변환기(20)는 인가되는 신호를전부 수신하기 위해서 공통분모인 6.0㎒를 기준으로 +, -500㎑를하여 신호를 검출하였다. 참고의 빗금친 부분을 예로들어 설명하겠다. 여기서, PAL Ⅰ방식인 경우 FM-Mono는 6.0㎑이고, NICAM은 6.552㎑이다. 이는 한 채널이 두 개의 캐리어를 실어서 전송하는 것을 뜻한다. 다시 제1도에서, PAL NICAM방식의 6.552㎒의 SIF신호를 입력받으면, 6.5㎒필터부(15)를 통해 500㎑변환기(20)로 출력된다. 500㎑변환기(20)는 인가받은 6.552㎒ SIF신호를 6.6㎒ SIF신호로 변환하여 출력한다. 그러나, 변환기를 통하여 출력되는 신호는 0.052㎒에 해당하는 노이즈가 섞이게 된다. 제2도를 참조하여 좀더 상세히 설명하겠다. 제2도는 주파수대역에 따른 이득을 나타낸 개념도이다. 제2도에서, 수평축은 주파수(f)를, 수직축은 이득(gain)을 나타낸다. 여기서, 6.5㎒ SIF신호와 6.552㎒ SIF신호에 빗금친 부분과 같이 겹치게 되는 부분(a)이 있어 노이즈가 발생한다.1 is a block diagram showing a conventional voice intermediate frequency selection device. Conventional voice intermediate frequency selection device is composed of a filtering means 10 consisting of three filter units and a 500 kHz converter 20 for receiving and converting the output signal of the filtering means 10. The filtering means 10 are each 0.5 MHz, i.e., it consists of three filter sections: a 5.5 MHz filter section 11, a 6.0 MHz filter section 13, and a 6.5 MHz filter section 15 so as to have a difference of 500 kHz. The 500 kHz converter 20 connected to the rear end of each filter unit detects a signal by performing + and -500 kHz based on a common denominator of 6.0 MHz in order to receive all of the applied signal. I will use the shaded part of the reference as an example. Here, in the PAL I system, FM-Mono is 6.0 Hz and NICAM is 6.552 Hz. This means that one channel carries two carriers. In FIG. 1, when a 6.552 MHz SIF signal of the PAL NICAM method is input, the SIF signal of the PAL NICAM method is output to the 500 kHz converter 20 through the 6.5 MHz filter unit 15. The 500 kHz converter 20 converts the received 6.552 MHz SIF signal into a 6.6 MHz SIF signal and outputs it. However, the signal output through the converter is mixed with noise corresponding to 0.052MHz. This will be described in more detail with reference to FIG. 2 is a conceptual diagram illustrating gain according to a frequency band. In FIG. 2, the horizontal axis represents frequency f and the vertical axis represents gain. Here, there is a portion (a) which overlaps with the 6.5 MHz SIF signal and the 6.552 MHz SIF signal such as a hatched portion, and noise is generated.
따라서, 본 발명의 목적은 위와같이 노이즈가 발생하는 문제점을 제거하기 위한 것으로, 방송방식을 판단하고, 판단된 방송방식에 해당하는 음성중간주파수로 필터링하도록 하는 자동 스위칭제어를 통해 노이즈의 제거가 가능하게 하는자동 음성중간주파수(SIF) 선택장치를 제공함에 있다.Accordingly, an object of the present invention is to eliminate the problem that noise occurs as described above, it is possible to remove the noise through the automatic switching control to determine the broadcast method, and to filter by the voice intermediate frequency corresponding to the determined broadcast method An automatic voice intermediate frequency (SIF) selection device is provided.
위와같은 목적을 달성하기 위한 본 발명의 특징은 멀티시스템의 오디오신호 처리장치에 있어서, 상기 오디오신호의 중간주파수신호를 입력받아 서로 다른 주파수 대역으로 필터링하는 다수개의 필터로 구성된 필터링수단, 상기 오디오신호의 중간주파수신호를 입력받아 방송방식을 판별하는 NICAM부, 상기 NICAM부에서 판별된 방송방식에 따라, 상기 다수개의 필터중 어느 하나를 선택하는 선택제어신호를 출력하는 제어부 및 상기 제어부로부터의 선택제어신호에 따라 상기 필터들을 통과한 신호중 어느 하나를 선택하여 출력하는 스위칭수단을 포함하는 자동 음성중간주파수(SIF) 선택장치에 있다.Features of the present invention for achieving the above object is an audio signal processing apparatus of a multi-system, filtering means consisting of a plurality of filters to receive the intermediate frequency signal of the audio signal to different frequency bands, the audio signal A NICAM unit for receiving an intermediate frequency signal of the control unit to determine a broadcasting method, a control unit for outputting a selection control signal for selecting any one of the plurality of filters according to the broadcasting method determined by the NICAM unit, and selection control from the control unit And a switching means for selecting and outputting any one of the signals passing through the filters according to the signal.
이하, 첨부한 도면을 참조하여 본 발명의 바람직한 일 실시예를 상세히 설명하겠다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.
제3도는 본 발명의 바람직한 일 실시예에 따른 자동 음성중간주파수(SIF) 선택장치를 나타낸 구성도이다. 중간주파수(IF; Intermediate Frequency)단으로부터 입력되는 음성중간주파수(SIF; Sound Intermediate Frequency)의 대역은 대략 4.5∼10㎒정도로 추출된다.3 is a block diagram showing an automatic speech intermediate frequency (SIF) selection apparatus according to an embodiment of the present invention. The band of the sound intermediate frequency (SIF) input from the intermediate frequency (IF) stage is extracted at about 4.5 to 10 MHz.
제3도에서, SIF신호는 NICAM부(31)로 인가되고, 동시에 5.5㎒필터부(1), 6.0㎒필터부(13), 6.5㎒(15)로 인가된다. NICAM부(31)는 디지탈 처리 오디오부로써 내부에서 PAL-B/G, Ⅰ 시스템방식의 판별이 가능하다. 한편 제어부(33)에는 PAL-B/G방식인 경우 5.5㎒ SIF신호를 통과시키고, PAL-Ⅰ방식인 경우는 6.0㎒ SIF신호를, PAL-D인 경우는 6.5㎒ SIF신호를 통과시키도록 기설정되어 있다. 예를들어, PAL-Ⅰ시스템에서, SIF신호가 PAL-NICAM방식인 경우를 설명하겠다. PAL-NICAM은 6.552㎒ SIF신호이지만, 6.0㎒ SIF신호와 같은 대역을 쓰고 있어 6.0㎒의 SIF신호의 출력을 내보내야 한다. 그러므로, NICAM부(31)는 이를 판별하여제어부(33)로 6.0㎒ SIF신호임을 알리는 신호를 출력한다. 따라서, 제어부(33)는 6.0㎒ SIF신호로 필터링하는 6.0㎒필터부(13)의 출력신호를선택하라는 선택제어신호를 스위칭부(19)로 출력한다. 따라서, 스위칭부(35)에서는 ②번 단자의 출력신호가 선택되어 6.0㎒ SIF신호가 출력된다.In FIG. 3, the SIF signal is applied to the NICAM unit 31 and simultaneously to the 5.5 MHz filter unit 1, the 6.0 MHz filter unit 13, and the 6.5 MHz 15. The NICAM unit 31 is a digital audio processing unit that can discriminate PAL-B / G and I system systems therein. On the other hand, the controller 33 passes a 5.5 MHz SIF signal in the PAL-B / G scheme, a 6.0 MHz SIF signal in the PAL-I scheme, and a 6.5 MHz SIF signal in the PAL-D scheme. It is set. For example, in the PAL-I system, the case where the SIF signal is the PAL-NICAM method will be described. The PAL-NICAM is a 6.552 MHz SIF signal, but uses the same band as the 6.0 MHz SIF signal, so the output of the 6.0 MHz SIF signal should be output. Therefore, the NICAM unit 31 determines this and outputs a signal informing the control unit 33 of the 6.0 MHz SIF signal. Accordingly, the controller 33 outputs a selection control signal to the switching unit 19 to select an output signal of the 6.0 MHz filter unit 13 that filters the 6.0 MHz SIF signal. Therefore, the switching unit 35 selects the output signal of terminal ② and outputs a 6.0 MHz SIF signal.
따라서, 본 발명은 전술한 바와같이 방송방식의 정확한 판별에 의해 입력되는 주파수신호에 해당하는 필터부의 출력신호를 제어부에서 자동으로 선택하여 줌으로써 사용자가 일일이 시스템을 조작했던 종래에 비해 자동으로 시스템이 선택되므로 AV기기의 조작이 더욱 간편해지는 효과를제 공한다.Accordingly, the present invention automatically selects the output signal of the filter unit corresponding to the frequency signal input by the accurate determination of the broadcasting method, as described above, by automatically selecting the system from the user, compared to the conventional system in which the user manipulated the system. This makes the operation of AV equipment easier.
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