KR0176762B1 - Dual mode if process apparatus of television receiver - Google Patents

Dual mode if process apparatus of television receiver Download PDF

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Publication number
KR0176762B1
KR0176762B1 KR1019950000916A KR19950000916A KR0176762B1 KR 0176762 B1 KR0176762 B1 KR 0176762B1 KR 1019950000916 A KR1019950000916 A KR 1019950000916A KR 19950000916 A KR19950000916 A KR 19950000916A KR 0176762 B1 KR0176762 B1 KR 0176762B1
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South Korea
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band
signal
tuner
output
vhf
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KR1019950000916A
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Korean (ko)
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KR960030724A (en
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신근철
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구자홍
엘지전자주식회사
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/14—Picture signal circuitry for video frequency region
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/46—Filters
    • H03H9/64—Filters using surface acoustic waves
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N11/00—Colour television systems
    • H04N11/06—Transmission systems characterised by the manner in which the individual colour picture signal components are combined
    • H04N11/12—Transmission systems characterised by the manner in which the individual colour picture signal components are combined using simultaneous signals only
    • H04N11/14—Transmission systems characterised by the manner in which the individual colour picture signal components are combined using simultaneous signals only in which one signal, modulated in phase and amplitude, conveys colour information and a second signal conveys brightness information, e.g. NTSC-system
    • H04N11/16—Transmission systems characterised by the manner in which the individual colour picture signal components are combined using simultaneous signals only in which one signal, modulated in phase and amplitude, conveys colour information and a second signal conveys brightness information, e.g. NTSC-system the chrominance signal alternating in phase, e.g. PAL-system
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N11/00—Colour television systems
    • H04N11/06—Transmission systems characterised by the manner in which the individual colour picture signal components are combined
    • H04N11/18—Transmission systems characterised by the manner in which the individual colour picture signal components are combined using simultaneous and sequential signals, e.g. SECAM-system
    • 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
    • H04N5/50—Tuning indicators; Automatic tuning control
    • 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
    • H04N5/62—Intercarrier circuits, i.e. heterodyning sound and vision carriers

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Superheterodyne Receivers (AREA)

Abstract

본 발명은 텔레비젼수상기의 중간주파수 처리기술에 관한 것으로, 일반적인 중간주파수 처리장치에 있어서는 튜너에서 출력되는 픽쳐반송파, 컬러반송파, 사운드반송파의 주파수대가 각기 다른 밴드로 출력되게 되어 있어 SECAM-L 방식에서 밴드에 따라 제1탄성표면파필터의 전단에서 반드시 스위칭을 해주어야만 하는 결함이 있었는 바, 본 발명은 이를 해결하기 위하여 SECAM-L 밴드에만 하측파대 헤테로다인 방식을 적용하고 나머지 밴드에는 상측파대 헤테로다인 방식을 적용하여 튜너의 중간주파수 출력단자에서는 방송방식과 밴드에 관계없이 동일한 용도의 반송파는 항상 동일한 주파수밴드로 출력되게 하였다.The present invention relates to an intermediate frequency processing technology of a television receiver. In a general intermediate frequency processing apparatus, bands of picture carriers, color carriers, and sound carriers that are output from a tuner are output to different bands. In order to solve this problem, the present invention applies the lower band heterodyne method only to the SECAM-L band and the upper band heterodyne method to the remaining bands. In the mid-frequency output terminal of the tuner, carriers of the same purpose are always output in the same frequency band regardless of the broadcast method and band.

Description

텔레비젼수상기의 듀얼방식 중간주파수 처리장치Dual Mode Intermediate Frequency Processing Unit of TV Receiver

제1도는 일반적인 텔레비젼수상기의 듀얼방식 중간주파수 처리블록도.1 is a dual system intermediate frequency processing block diagram of a typical television receiver.

제2도는 일반적인 텔레비젼수상기에서 밴드 선택신호의 출력표.2 is an output table of band selection signals in a typical television receiver.

제3도는 일반적인 텔레비젼수상기에서 고주파신호와 반송파 특성표.3 is a table of high frequency signals and carrier characteristics in a typical television receiver.

제4도는 본 발명 텔레비젼수상기의 듀얼방식 중간주파수 처리 블록도.4 is a dual system intermediate frequency processing block diagram of a television receiver according to the present invention.

제5도는 제4도에서 튜너의 상세 블록도.5 is a detailed block diagram of the tuner in FIG.

제6도는 본 발명에서 밴드 선택신호의 출력표.6 is an output table of the band selection signal in the present invention.

제7도는 본 발명 텔레비젼수상기에서 고주파신호와 반송파 특성표.7 is a high frequency signal and carrier characteristics table in the television receiver of the present invention.

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

11 : 밴드선택부 12 : 튜너11: band selector 12: tuner

13 : 전치증폭부 14 : 제1탄성표면파 필터13: preamplifier 14: first surface acoustic wave filter

15 : 제2탄성표면파필터 16 : 영상/음성중간주파 처리부15: second surface acoustic wave filter 16: video / audio intermediate frequency processing unit

본 발명은 텔레비젼수상기의 중간주파수 처리기술에 관한 것으로, 특히 PAL방식과 SECAM-L방식을 모두 수용하는 듀얼 튜닝 시스템에서 선택되는 대역에 따라 튜너의 국부발진 방식을 다르게 적용하여 방송방식 및 밴드에 관계없이 항상 일정한 중간주파수를 출력하는데 적당하도록 한 텔레비젼수상기의 듀얼방식 중간주파수 처리장치에 관한 것이다.The present invention relates to an intermediate frequency processing technology of a television receiver, and in particular, a local oscillation method of a tuner is differently applied according to a band selected in a dual tuning system that accommodates both a PAL method and a SECAM-L method. The present invention relates to a dual-mode intermediate frequency processing apparatus of a television receiver, which is adapted to always output a constant intermediate frequency without.

제1도는 일반적인 텔레비젼수상기의 듀얼방식(PAL/SECAM-L)중간주파수 처리장치에 대한 블록도로서 이의 작용을 제2도 및 제3도를 참조하여 설명하면 다음과 같다.FIG. 1 is a block diagram of a dual type (PAL / SECAM-L) intermediate frequency processing apparatus of a general television receiver, which will be described with reference to FIGS. 2 and 3 as follows.

마이크로컴퓨터(도면에 미표시)로 부터 출력되는 밴드신호(BANB A)와 밴드신호(BAND B)가 제2도에서와 같이 방송방식에는 관계없이 선택하고자 하는 밴드(주파수대역)에 따라 로우신호(L)로 입력되거나 하이신호(H)로 입력되어 한편으로는 밴드선택부(1)에 공급되고, 다른 한편으로는 스위칭 절환을 위해 인버터(I)를 통해 앤드게이트(AD)의 제1입력단으로, 직접 앤드게이트(AD)의 제2입력단으로 공급된다.The band signal BANB A and the band signal BAND B output from the microcomputer (not shown in the drawing) are low signal L according to the band (frequency band) to be selected regardless of the broadcasting method as shown in FIG. Input to the band selector 1 on the one hand and to the first input terminal of the AND gate AD through the inverter I for switching switching. It is directly supplied to the second input terminal of the AND gate AD.

상기 밴드선택부(1)는 입력되는 밴드신호(BAND A), (BAND B)에 따라 선택된 구동전원을 튜너(2)의 밴드단자(UHF), (VHF H), (VHF L)에 공급하게 되어 해당 밴드가 구동되고, 이에 따라 고주단자(RF)로 입력되는 신호가 소정의 처리과정을 통해 중간주파수단자(IF)측으로 출력되며, 이는 다시 전치증폭부(3)를 통해 처리하는데 적당한 수준으로 증폭출력된다.The band selector 1 supplies the driving power selected according to the input band signals BAND A and BAND B to the band terminals UHF, VHF H, and VHF L of the tuner 2. The band is driven, and thus the signal input to the high frequency terminal (RF) is output to the intermediate frequency terminal (IF) side through a predetermined process, which is suitable for processing through the preamplifier 3 again. Amplified output.

한편, 탄성표면파필터(5)의 제1대역필터(5A)는 SECAM-L VH, UHF 음성신호를 대역필터링하고, 제2대역필터(5B)는 SECAM-L VL음성신호를 각각 필터링하여 영상/음성중간주파 처리부(7)에 출력하고, 이 때, 제3대역필터(6)는 PAL방송의 영상 및 음성신호, SECAM 방송의 영상신호를 대역필터링하여 영상/음성중간주파 처리부(7)에 출력하게 된다.On the other hand, the first band filter 5A of the surface acoustic wave filter 5 band-pass filters the SECAM-L VH and UHF audio signals, and the second band filter 5B filters the SECAM-L VL audio signals, respectively. The third band filter 6 band-filters the video and audio signals of the PAL broadcast and the video signals of the SECAM broadcast to the video / audio intermediate frequency processing section 7 at this time. Done.

따라서, 상기 전치증폭부(3)의 출력신호를 상기 탄성표면파필터(5)에 선택적으로 공급하기 위하여 두 개의 스위치(SW1), (SW2)를 탄성표면파필터(5)내에 있는 제1대역필터(5A), 제2대역필터(5B)에 각각 연결하고, 상기 밴드신호(BAND A)를 직접 앤드게이트(AD)의 제2입력신호로, 밴드신호(BAND B)를 인버터(I)를 통해 반전시켜 제2입력신호로, SECAM모드시 마이크로컴퓨터로부터 입력되는 H신호를 제3입력신호로 하여 앤드조합된 신호로 상기 스위치(SW1)의 스위칭을 제어하고, 그 앤드게이트(AD)의 출력신호를 인버터부(4)를 통해 반전시킨 신호로 스위치(SW2)의 스위칭을 제어하게 된다.Therefore, in order to selectively supply the output signal of the preamplifier 3 to the surface acoustic wave filter 5, two switches SW1 and SW2 are provided in the surface acoustic wave filter 5. 5A) and the second band filter 5B, respectively, and invert the band signal BAND A directly to the second input signal of the AND gate AD, and invert the band signal BAND B through the inverter I. To control the switching of the switch SW1 with an AND-combined signal using the H signal input from the microcomputer in the SECAM mode as the third input signal, and control the output signal of the AND gate AD. The switching of the switch SW2 is controlled by the signal inverted through the inverter unit 4.

제3도는 상기 튜너(2)의 고주파단자(RF)로 입력되는 SECAM-L 방식과 PAL방식의 신호가 서로 다름을 나타낸 것이고, 그 튜너(2)가 밴드에 관계없이 모두 상측파대 헤테로다인(Upper Side Heterodyne)방식일 때 중간주파수단자(IF)의 출력상태를 보인 것이다. 여기서, SECAM-L의 VL밴드는 고주파신호의 주파수 밴드가 달라 VL과 VH, VHF밴드에 따라 음성 반송파성분을 탄성표면파필터(5)의 전단에서 스위칭해 주어야 한다.FIG. 3 shows that the SECAM-L and PAL signals inputted to the high frequency terminal RF of the tuner 2 are different from each other. The upper band heterodyne (Upper) is used regardless of the band of the tuner 2. Side Heterodyne) shows the output state of the intermediate frequency terminal (IF). Here, the VL band of the SECAM-L has a different frequency band of the high frequency signal, so that the voice carrier component must be switched at the front end of the surface acoustic wave filter 5 according to the VL, VH, and VHF bands.

그러나, 이와 같은 일반적인 중간주파수 처리장치에 있어서는 튜너에서 출력되는 픽쳐반송파, 컬러반송파, 사운드반송파의 주파수대가 각기 다른 밴드로 출력되게 되어 있어 SECAM-L 방식에서 밴드에 따라 제1탄성표면파필터의 전단에서 반드시 스위칭을 해주어야만 하는데, 주파수대가 고역(32∼42MHZ)이므로 완전한 스위칭이 어렵고 상호 간섭성분도 배제할 수 없어 성능이 저하되는 결함이 있다. 또한, 스위칭을 위해 별도로 제어신호를 공급해 주어야 하는 어려움이 있고, PAL과 SECAM-L VH, UHF와 SECAM-L VL 밴드신호간에 주파수 차가 있어 한쪽 밴드를 기준으로 맞추어주면 다른 밴드는 특성상 성능이 저하되는 결함이 있었다.However, in such a general intermediate frequency processing apparatus, the frequency bands of the picture carrier, the color carrier, and the sound carrier output from the tuner are output in different bands, and according to the band in the SECAM-L method, at the front end of the first surface acoustic wave filter. It must be switched, but since the frequency band is high (32-42MHZ), it is difficult to completely switch and mutual interference components cannot be excluded. In addition, there is a difficulty in supplying a control signal separately for switching, and there is a frequency difference between PAL and SECAM-L VH, UHF and SECAM-L VL band signals. There was a fault.

따라서, 본 발명의 목적은 SECAM-L 밴드에만 하측파대 헤테로다인 방식을 적용하고 나머지 밴드에는 상측파대 헤테로다인 방식을 적용하는 방식을 채택하여 탄성표면파 필터의 전단에서 스위칭 회로를 사용하지 않는 듀얼방식 중간주파수 처리장치를 제공함에 있다.Accordingly, an object of the present invention is to adopt the lower band heterodyne method only to the SECAM-L band and the upper band heterodyne method to the remaining bands, thereby adopting a dual method that does not use a switching circuit in front of the surface acoustic wave filter. The present invention provides a frequency processor.

제4도는 상기의 목적을 달성하기 위한 본 발명 텔레비젼수상기의 듀얼방식 중간주파수 처리장치에 대한 일실시 예시블록도로서 이에 도시한 바와 같이, 입력되는 밴드신호(BAND A), (BAND B)에 따라 튜너(12)에 각 주파수밴드의 구동신호를 출력하는 밴드선택부(11)와; 상기 밴드선택부(11)로부터 구동신호를 입력받아 PAL방식의 모든 밴드와 SECAM-L 방식의 VHF H, UHF밴드는 상측파대 헤테로다인 방식을 적용하고, SECAM-L 방식의 VHF L밴드만 하측파대 헤테로다인 방식을 적용하여 튜닝하는 튜너(12)와; 상기 튜너(12)의 출력신호를 입력하여 SECAM-L 방식의 음성반송파신호를 필터링하는 제1탄성표면파필터(14)와; 상기 튜너(12)의 출력신호를 입력하여 PAL/SECAM-L 방식의 픽쳐반송파아 컬러반송파, PAL의 음성반송파신호를 필터링하는 제2탄성표면파필터(15)와; 상기 제1, 2탄성표면파필터(14), (15)의 출력신호를 소정의 형식으로 영상/음성처리하는 영상/음성중간주파 처리부(16)로 구성한 것으로, 이와 같이 구성한 본 발명의 작용 및 효과를 첨부한 제5도 내지 제7도를 참조하여 상세히 설명하면 다음과 같다.4 is an exemplary block diagram of a dual-mode intermediate frequency processing apparatus of a television receiver according to the present invention for achieving the above object. As shown in FIG. 4, according to the input band signals BAND A and BAND B, FIG. A band selector 11 outputting a drive signal for each frequency band to the tuner 12; All the bands of the PAL method and the VHF H, UHF bands of the SECAM-L method adopt the upper band heterodyne method, and only the VHF L band of the SECAM-L method receives the driving signal from the band selector 11. A tuner 12 for tuning by applying a heterodyne scheme; A first elastic surface wave filter (14) for inputting the output signal of the tuner (12) to filter the voice carrier signal of the SECAM-L method; A second elastic surface wave filter (15) for inputting an output signal of the tuner (12) to filter a PAL / SECAM-L type picture carrier color carrier and a PAL voice carrier signal; An image / audio intermediate frequency processing section 16 which performs video / audio processing on the output signals of the first and second surface acoustic wave filters 14 and 15 in a predetermined format. When described in detail with reference to the attached 5 to 7 as follows.

마이크로컴퓨터(도면에 미표시)로부터 출력되는 밴드신호(BAND A), (BAND B)가 제6도에서와 같이 방송방식에는 관계없이 선택하고자 하는 밴드에 따라 제6도에서와 같이 로우 또는 하이신호로 출력된다.Band signals (BAND A) and (BAND B) output from a microcomputer (not shown in the drawing) are either low or high as shown in FIG. 6, depending on the band to be selected regardless of the broadcasting method as shown in FIG. Is output.

PAL/SECAM-L방식의 UHF모드에서 상기 밴드신호(BAND A), (BAND B)가 각각 로우(L)로 출력되어 밴드선택부(11)에서 튜너(12)의 밴드단자(UHF)측으로 전원단자전압(Vcc)레벨의 하이(H)신호가 출력된다.In the PAL / SECAM-L type UHF mode, the band signals BAND A and BAND B are outputted as low L, respectively, from the band selector 11 to the band terminal UHF side of the tuner 12. The high (H) signal of the terminal voltage (Vcc) level is output.

이에 따라 상기 튜너(12)의 내부에서는 제5도에서와 같이 스위치(SW)가 고정단자(U)에 단락되고, UHF튜너(12B)에 구동전원이 공급되어 고주파단자(RF)단자로 입력되는 신호가 그 UHF튜너(12B)에서 복조처리되어 중간주파수단자(IF)로 출력되고, 이는 상기 스위치(SW)를 통해 VHF튜너(12C)에 공급되는데, 이때, VHF튜너(12C)에서 국부발진기(25)는 구동되지 않고 고주파/중간주파 증폭기(24)가 UHF 중간주파증폭기로 동작하고, 혼합기 및 중간주파증폭기(26)도 UHF 중간주파증폭기로 동작되므로 그 UHF튜너(12B)로 부터 입력되는 UHF의 중간주파수신호는 그들을 통해 소정 레벨로 증폭된 후 전치증폭부(13)측으로 출력된다.Accordingly, as shown in FIG. 5, the switch SW is short-circuited to the fixed terminal U, and the driving power is supplied to the UHF tuner 12B to input the high frequency terminal RF into the tuner 12. The signal is demodulated in the UHF tuner 12B and output to the intermediate frequency terminal IF, which is supplied to the VHF tuner 12C through the switch SW, where the local oscillator ( 25) is not driven and the high frequency / intermediate frequency amplifier 24 operates as the UHF intermediate frequency amplifier, and the mixer and the intermediate frequency amplifier 26 also operate as the UHF intermediate frequency amplifier, so that the UHF input from the UHF tuner 12B is performed. The intermediate frequency signal of is amplified to a predetermined level through them and then output to the preamplifier 13 side.

VHF모드에서 상기 밴드신호(BAND A), (BAND B)가 각각 L, H로 출력되어 상기 밴드선택부(11)에서 튜너(12)의 밴드단자(VHF H)측으로 상기와 같은 H신호가 출력된다.In the VHF mode, the band signals BAND A and BAND B are output as L and H, respectively, and the H signals are output from the band selector 11 to the VHF H side of the tuner 12. do.

이에 따라 상기 스위치(SW)가 고정단자(V)에 단락되어 고주파단자(RF)로 입력되는 신호가 그 스위치(SW)를 통해 상기 VHF튜너(12C)에 공급되는데, 이때, 국부발진기(25)가 구동되고, 상기 고주파/중간주파증폭기(24)가 VHF 고주파증폭기로 동작하고, 혼합기 및 중간주파증폭기(26)가 VHF 혼합기로 동작되므로 입력신호가 이들을 통해 복조처리되어 이로부터 VHF의 중간주파수신호가 출력된다.Accordingly, the switch SW is short-circuited to the fixed terminal V and a signal input to the high frequency terminal RF is supplied to the VHF tuner 12C through the switch SW. In this case, the local oscillator 25 Is driven, the high frequency / intermediate frequency amplifier 24 operates as a VHF high frequency amplifier, and the mixer and intermediate frequency amplifier 26 operates as a VHF mixer, so that the input signals are demodulated through them to thereby output the intermediate frequency signals of the VHF. Is output.

PAL방식 VHF L모드에서 상기 밴드신호(BAND A), (BAND B)가 각각 H, L로 출력되어 상기 밴드선택부(11)에서 튜너(12)의 밴드단자(VHF L1)측으로 상기와 같은 H신호가 출력된다.In the PAL VHF L mode, the band signals BAND A and BAND B are output as H and L, respectively, and the band selector 11 is connected to the band terminal VHF L1 of the tuner 12 as described above. The signal is output.

이에 따라 상기 국부발진기(25)의 입력단자(VHF L1)에 구동전원이 공급되어 그 국부발진기(25)가 해당 주파수의 발진신호를 생성하게 되고, 이로 인하여 상기 고주파신호가 혼합기 및 중간주파증폭기(26)에서 그 발진신호와 혼합처리되어 이로부터 VHF의 중간주파수신호가 출력된다.Accordingly, driving power is supplied to the input terminal VHF L1 of the local oscillator 25 so that the local oscillator 25 generates an oscillation signal of a corresponding frequency, whereby the high frequency signal is a mixer and an intermediate frequency amplifier ( In 26), the oscillation signal is mixed with the intermediate frequency signal of the VHF.

SECAM방식 VHF L모드에서 상기 밴드신호(BAND A), (BAND B)가 모두 H로 출력되어 상기 밴드선택부(11)에서 튜너(12)의 밴드단자(VHF L2)측으로 상기와 같은 H신호가 출력된다.In the SECAM VHF L mode, the band signals BAND A and BAND B are all output as H, and the H signal is transmitted from the band selector 11 to the VHF L2 side of the tuner 12. Is output.

이에 따라 상기 국부발진기(25)의 입력단자(VHF L2)에 구동전원이 공급되어 그 국부발진기(25)가 해당 주파수의 발진신호를 생성하게 되고, 이로 인하여 상기 고주파신호가 혼합기 및 중간주파증폭기(26)에서 그 발진신호와 혼합처리되어 이로부터 VHF의 중간주파수신호가 출력된다.Accordingly, driving power is supplied to the input terminal VHF L2 of the local oscillator 25 so that the local oscillator 25 generates an oscillation signal of a corresponding frequency, whereby the high frequency signal is a mixer and an intermediate frequency amplifier ( In 26), the oscillation signal is mixed with the intermediate frequency signal of the VHF.

여기서, 주목할 것은 종래의 튜너에서는 VHF튜너단 내부의 국부발진을 구동하는 것이 VHF H와 VHF Ll 두 밴드밖에 없었으나 본 발명에서는 상기와 같이 VHF L2모드를 하나 더 추가하고, 국부발진 방식도 상측파대가 아닌 하측파대의 헤테로다인을 적용함으로써 SECAM-L VL밴드에서도 최종 중간주파수신호의 픽쳐반송파(P.C)를 동일하게 할 수 있게 된다.Here, it should be noted that in the conventional tuner, only two bands driving the local oscillation inside the VHF tuner stage are VHF H and VHF Ll, but in the present invention, one more VHF L2 mode is added as described above, and the local oscillation method also has an upper band. By applying the heterodyne instead of the lower band, the picture carrier (PC) of the final intermediate frequency signal can be equalized in the SECAM-L VL band.

다시 말해서, 제7도에 도시한 방송 고주파신호와 튜너의 중간주파수신호 반송파 특성에서와 같이, 방송 고주파신호가 PAL방식의 모든 밴드와 SECAM방식 VHF H, UHF 밴드는 픽쳐반송파 주파수(fPC)와 컬러반송파(fCC)의 주파수대가 동일하고, 음성반송파(fSC)의 주파수도 동일하나 단지 방식에 따른 픽쳐반송파(fPC)의 주파수와 컬러반송파(fCC)의 주파수간격만 PAL(B/G)방식은 5.5MHZ, SECAM-L방식은 6.5MHZ로 차이가 있다.In other words, as shown in the characteristics of the broadcast high frequency signal and the tuner intermediate frequency signal carrier shown in Fig. 7, all the bands of the PAL method, the SECAM type VHF H, and the UHF bands are equal to the picture carrier frequency f PC . The frequency band of the color carrier f CC is the same, and the frequency of the voice carrier f SC is the same, but only the frequency interval of the picture carrier f PC and the frequency carrier of the color carrier f CC according to the scheme is PAL (B / G) method is 5.5MHZ, SECAM-L method is 6.5MHZ.

따라서, PAL방식의 모든 밴드와 SECAM-L방식의 VHF H, UHF밴드는 상측파대 헤테로인방식을 적용하고, SECAM-L 방식의 VHF L 밴드만 하측파대 헤테로다인 방식을 적용하여 SECAM-L VL밴드의 고주파방송신호의 fPC, fSC, fCC주파수가 뒤바뀌어 있는 것을 튜너(12)의 중간주파수단자(IF)에서는 각 밴드에서 항상 동일한 주파수로 출력되게 함으로써 제1탄성표면파필터(14)의 전단에 종래와 같이 스위치를 사용하지 않아도 된다.Therefore, all bands of the PAL method and the VHF H and UHF bands of the SECAM-L method use the upper band heteroin method, and the SECAM-L type VHF L band uses the lower band heterodyne method. The frequency of the high frequency broadcast signal of the PC , f SC , f CC is inverted in the intermediate frequency terminal (IF) of the tuner 12 to always output the same frequency in each band of the first surface acoustic wave filter 14 It is not necessary to use a switch as before in the prior art.

참고로, 상기 SECAM-L 음성통과용 제1탄성표면파필터(14)는 fSC2를 대역필터링하고, 제2탄성표면파필터(15)는 PAL/SECAM-L의 fPC와 fCC그리고, PAL의 음성성분인 fSC1을 대역필터링한다. 그리고, PAL방식의 모든 밴드와 SECAM-L방식의 VHF H, UHF밴드는 하측파대 헤테로인방식을 적용하고, SECAM-L 방식의 VHF L 밴드만 상측파대 헤테로다인 방식을 적용하여도 상기와 동일한 효과를 얻을 수 있게 된다.For reference, the SECAM-L voice pass first acoustic surface wave filter 14 band filters f SC2 , and the second elastic surface wave filter 15 includes f PC and f CC of PAL / SECAM-L and PAL. Band-filtering the negative component f SC1 is performed. In addition, all bands of the PAL method and the VHF H and UHF bands of the SECAM-L method apply the lower band heteroin method, and the same effect as above is applied even if the VAMF L band of the SECAM-L method applies the upper band heterodyne method. Will be obtained.

이상에서 상세히 설명한 바와 같이, 본 발명은 SECAM-L 밴드에만 하측파대 헤테로다인 방식을 적용하고 나머지 밴드에는 상측파대 헤테로다인 방식을 적용하여 튜너의 중간주파수 출력단자에서는 방송방식과 밴드에 관계없이 동일한 용도의 반송파는 항상 동일한 주파수밴드로 출력되게 함으로써 탄성표면파 필터의 전단에서 스위칭 회로를 사용하지 않아 음성신호의 상호간섭을 유발시키지 않고, 주변회로에 악영향을 주지 않아 시스템의 성능을 향상시킬 수 있는 효과가 있다.As described in detail above, the present invention applies the lower band heterodyne method only to the SECAM-L band and the upper band heterodyne method to the remaining bands, so that the same use regardless of the broadcasting method and the band in the intermediate frequency output terminal of the tuner. Since the carrier wave is always output in the same frequency band, the switching circuit is not used at the front of the surface acoustic wave filter, so that it does not cause mutual interference of voice signals and does not adversely affect the peripheral circuits, thereby improving the performance of the system. have.

Claims (2)

입력되는 밴드신호에 따라 튜너(12)에 각 주파수밴드의 구동신호를 출력하는 밴드선택부(11)와; 상기 밴드선택부(11)로부터 구동신호를 입력받아 PAL방식의 모든 밴드와 SECAM-L 방식의 VHF H, UHF밴드는 상측파대 헤테로다인 방식을 적용하고, SECAM-L 방식의 VHF L밴드만 하측파대 헤테로다인 방식을 적용하여 튜닝하는 튜너(12)와; 상기 튜너(12)의 출력신호를 입력하여 SECAM-L 방식의 음성반송파신호를 필터링하는 제1탄성표면파필터(14)와; 상기 튜너(12)의 출력신호를 입력하여 PAL/SECAM-L 방식의 픽쳐반송파와 컬러반송파, PAL의 음성반송파신호를 필터링하는 제2탄성표면파필터(15)로 구성한 것을 특징으로 하는 텔레비젼수상기의 듀얼방식 중간주파수 처리장치.A band selector 11 outputting a drive signal of each frequency band to the tuner 12 according to the input band signal; All the bands of the PAL method and the VHF H, UHF bands of the SECAM-L method adopt the upper band heterodyne method, and only the VHF L band of the SECAM-L method receives the driving signal from the band selector 11. A tuner 12 for tuning by applying a heterodyne scheme; A first elastic surface wave filter (14) for inputting the output signal of the tuner (12) to filter the voice carrier signal of the SECAM-L method; Dual TV receiver comprising: a second elastic surface wave filter (15) for inputting the output signal of the tuner (12) to filter PAL / SECAM-L type picture carrier, color carrier, and PAL voice carrier signal Intermediate Frequency Processing System. 제1항에 있어서, 튜너(12)는 밴드선택부(11)로부터 구동신호(UHF)가 입력될 때 입력 고주파신호를 복조처리하여 중간주파수신호를 출력하는 UHF튜너(12B)와, 상기 밴트선택부(11)에서 출력되는 구동신호(UHF)에 따라 고주파신호를 선택하거나 상기 UHF튜너(12B)에서 출력되는 중간주파수신호를 선택하는 스위치(SW)와, 상기 밴드선택부(11)에서 출력되는 구동신호(VHF H), (VHF Ll), (VHF L2)에 따라 상기 스위치(SW)에서 출력되는 UHF튜너(12B)의 출력신호를 그대로 증폭출력하거나 고주파신호를 복조처리하여 각 밴드에서 픽쳐반송파(fPC), 컬러반송파(fCC), 음성반송파(fSC)의 중간주파수를 동일주파수로 출력하는 VHF튜너(12C)로 구성한 것을 특징으로 하는 텔레비젼수상기의 듀얼방식 중간주파수 처리장치.The UHF tuner 12B according to claim 1, wherein the tuner 12 demodulates an input high frequency signal when the driving signal UHF is input from the band selector 11, and outputs an intermediate frequency signal. A switch SW for selecting a high frequency signal according to the driving signal UHF output from the unit 11 or an intermediate frequency signal output from the UHF tuner 12B, and the band selecting unit 11 Amplifying and outputting the output signal of the UHF tuner 12B output from the switch SW according to the driving signals VHF H, VHF Ll, and VHF L2, or demodulating the high frequency signal to carry the picture carrier in each band. and a VHF tuner (12C) for outputting the intermediate frequencies of (f PC ), color carrier (f CC ) and voice carrier (f SC ) at the same frequency.
KR1019950000916A 1995-01-20 1995-01-20 Dual mode if process apparatus of television receiver KR0176762B1 (en)

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