• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Automatically discriminates and selects the frequency of the voice carrier signal from the input voice intermediate frequency signal. The filter unit sequentially filters and outputs 4.5MHz, 5.5MHz, 6.0MHz and 6.5MHz signals one by one according to the control of the microcomputer. After limiting and amplifying the output signal of the filter unit in the limiter / amplifier, the audio signal is detected by an automatic phase control (APC) and a voltage controlled oscillator, and the voltage limiter / amplifier and the voltage control are performed according to a gate pulse signal input at a predetermined period. The number of pulse signals output from the oscillator is counted to determine whether the voice intermediate frequency signal is detected, and when the voice intermediate frequency signal is detected, it is converted into a digital signal and transmitted to the microcomputer, and the microcomputer transmits the signal. If it is detected by judging whether the voice intermediate frequency signal is detected The filter unit continuously outputs the voice intermediate frequency signal of the frequency currently being filtered, and if it is not detected, the filter unit outputs the voice intermediate frequency signal of another frequency without the user selecting the voice intermediate frequency signal. The signal is detected and output.
    公开号:KR19980044420A
    申请号:KR1019960062513
    申请日:1996-12-06
    公开日:1998-09-05
    发明作者:엄주기
    申请人:김광호；삼성전자 주식회사；
    IPC主号:
    专利说明:

    Audio signal switching circuit of multiple video receiver
    The present invention relates to a multi-image receiver such as a television receiver and a video cassette tape recorder for receiving a television broadcast signal of a National Television System Committee (NTSC) system and a television alteration signal of a phase alteration by line (PAL) system. The present invention relates to an audio signal switching circuit of a multiple video receiver selectively outputting an audio signal and a PAL audio signal.
    In general, television broadcasting methods include NTSC-M, NTSC-D / K, PAL-B / G / H, and PAL-D.
    The carrier frequency of the voice signal is different according to these methods.
    For example, the NTSC-M system has a 4.5 MHz carrier frequency difference, the PAL-B / G / H system has a 5.5 MHz, the PAL-I system has a 6.0 MHz, and the PAL-D / K / K1. The method is 6.5MHz.
    Therefore, an image receiver capable of receiving both NTSC and PAL schemes can receive various kinds of audio signals having different carrier frequency differences as described above.
    1 is a conventional voice signal switching circuit diagram. Here, reference numeral 1 denotes a microcomputer which outputs a control signal according to a frequency to be selected from a voice intermediate frequency signal according to a user selection signal, and reference numeral 2 denotes an operation of outputting an operating power source according to a control signal output by the microcomputer 1. The control unit 3 is a filter unit for selectively outputting signals of 4.5 MHz, 5.5 MHz, 6.0 MHz, and 6.5 MHz in the voice intermediate frequency signal according to the output signal of the operation control unit 2.
    The operation control unit 2 has an output terminal OUT1OU4 of the microcomputer 1 connected to the base of the transistor Q1Q4 through a resistor R1R4, and a power supply B + to the collector of the transistor Q1Q4. R5R8) is connected to each other and the operating power is selectively output through the resistor R9R12 at the connection point.
    The filter unit 3 is connected to one terminal of the ceramic filter CF1CF4, in which a voice intermediate frequency signal detects signals of 4.5 MHz, 5.5 MHz, 6.0 MHz, and 6.5 MHz through the diode D1D4, respectively. The other terminal of the resistor R9R12 is connected to the audio intermediate frequency signal of the selected frequency at the other terminal of the ceramic filter CF1CF4.
    In the conventional voice signal switching circuit configured as described above, the microcomputer 1 selectively outputs the high potential to the output terminal OUT1OUT4 according to a selection signal input by a user.
    For example, if the user selects 4.5 MHz, the high potential is output to the output terminal (OUT1), if the user selects 5.5 MHz, the high potential is output to the output terminal (OUT2), and if the user selects 6.0 MHz, the output terminal. High potential is output to (OUT3), and high potential is output to output terminal (OUT4) when 6.5MHz is selected.
    Here, assuming that the user selects 4.5 MHz and outputs the high potential to the output terminal OUT1, the high potential of the output terminal OUT1 is the base of the transistor Q1 through the resistor R1 of the operation control unit 2. Transistor Q1 is turned on.
    Then, the power source B + flows to the ground through the resistor R5 and the transistor Q1, and a low potential is applied to the cathode of the diode D1 so that the diode D1 is in a conductive state.
    As described above, when the diode D1 is brought into a conductive state, the input voice intermediate frequency signal is passed through the diode D1, and a 4.5 MHz voice intermediate frequency signal is detected and output from the ceramic filter CF1.
    At this time, the microcomputer 1 outputs all the low potentials to the output terminals OUT2OUT4 so that the transistor Q2Q4 is turned off, and the power supply B + is the resistors R6, R10 (R7, R11) (R8, R12). Since the diode D2D4 is applied to the cathode of the diode D2D4, the diodes D2D4 are all blocked, and the ceramic filter CF2CF4 does not detect the intermediate frequency signal.
    When the user selects 5.5 MHz, the microcomputer 1 outputs a high potential to the output terminal OUT2 so that the transistor Q2 is turned on and the diode D2 is turned on so that the ceramic filter CF2 is 5.5. When detecting and outputting an intermediate frequency signal of MHz, and selecting 6.0 MHz, the transistor Q3 is turned on by outputting the high potential to the output terminal OUT3, and the diode D3 is in a conductive state. Detects and outputs an intermediate frequency signal of 6.0 MHz. When 6.5 MHz is selected, the transistor Q4 is turned on by outputting the high potential to the output terminal OUT4, and the diode D4 is in a conductive state. CF4) detects and outputs a 6.5 MHz mid-frequency signal.
    The conventional technology detects and outputs a signal of 4.5 MHz, 5.5 MHz, 6.0 MHz or 6.5 MHz in a voice intermediate frequency signal according to a user's selection.
    Therefore, the user has to determine the frequency of the voice carrier signal of the currently received broadcast signal, and input the selection signal according to the determined frequency, which gave the user a lot of inconvenience and hassle.
    Accordingly, an object of the present invention is to provide an audio signal switching circuit of a multiple image receiver for automatically determining and outputting a frequency of an audio carrier signal from an input audio intermediate frequency signal.
    In order to achieve the above object, the audio signal switching circuit of the multi-image receiver according to the present invention filters and sequentially outputs 4.5MHz, 5.5MHz, 6.0MHz, and 6.5MHz signals one by one under the control of a microcomputer, and filters the signals. The negative output signal is amplified and limited by the limiter / amplifier and then the audio signal is detected by the automatic phase control (APC) and voltage controlled oscillator.
    The number of pulse signals output from the limiter / amplifier and the voltage controlled oscillator is counted according to a gate pulse signal input at a predetermined period to determine whether or not a voice intermediate frequency signal is detected. After conversion to the microcomputer to transfer.
    The microcomputer determines whether the voice intermediate frequency signal is detected as the transmitted signal and, if detected, causes the filter unit to continuously output the voice intermediate frequency signal of the frequency currently being filtered. Outputs an intermediate frequency signal.
    Therefore, according to the present invention, the user can detect and output the voice intermediate frequency signal without selecting the voice intermediate frequency signal.
    1 is a conventional voice signal switching circuit diagram.
    2 is a voice signal switching circuit diagram of the present invention.
    Explanation of symbols on the main parts of the drawings
    1: microcomputer
    2: motion control unit
    3: filter part
    4 limiter / amplifier
    5: APC
    6: voltage controlled oscillator
    7: pulse signal detector
    8: analog / digital converter
    9: I 2 C bus control
    Hereinafter, the audio signal switching circuit of the multi-image receiver of the present invention will be described in detail with reference to the accompanying drawings of FIG.
    2 is an audio signal switching circuit diagram of a multi-image receiver of the present invention. As shown therein, the microcomputer 1 outputs a control signal according to a frequency to be selected from the voice intermediate frequency signal, and the operation control unit 2 outputs an operating power according to the control signal output from the microcomputer 1. And a filter unit 3 for selectively outputting signals of 4.5 MHz, 5.5 MHz, 6.0 MHz, and 6.5 MHz from the voice intermediate frequency signal according to the output signal of the operation control unit 2, A limiter / amplifier 4 for limiting and amplifying the amplitude of the output signal, an APC 5 for detecting an audio signal from the output signal of the limiter / amplifier 4, and an oscillation according to the output signal of the APC 5; A voltage controlled oscillator 6 for causing the APC 5 to detect a voice signal, and a pulse signal output by the limiter / amplifier 4 and the voltage controlled oscillator 6 during a period of a gate pulse signal input at a predetermined period. Is detected and output as an analog signal. Was composed of a pulse signal detecting section 7 and, I 2 C bus controller (9) for converting an output signal of the pulse signal detecting section 8 into a digital signal outputted to the microcomputer (1).
    In the audio signal switching circuit of the multi-image receiver of the present invention configured as described above, the microcomputer 1 controls the operation control unit 2 so that the filter unit 3 performs 4.5MHz, 5.5MHz, 6.0MHz and Sequentially detect 6.5MHz voice mid-frequency signal.
    The audio intermediate frequency signal output from the filter unit 3 is limited in amplitude at the limiter / amplifier and amplified to a predetermined level and then output.
    The audio intermediate frequency signal output from the limiter / amplifier 4 is input to the APC 5 to adjust the phase, the voltage controlled oscillator 6 oscillates according to the output signal of the APC 5, and the oscillation signal is APC. The APC 5 detects and outputs an audio signal from the audio intermediate frequency signal.
    The output signals of the limiter / amplifier 4 and the voltage controlled oscillator 6 are input to the pulse signal detector 7, and the gate pulse signal is input to the pulse signal detector 7.
    Here, the gate pulse signal is input at a predetermined period, for example, the gate pulse signal is input at a period of the horizontal synchronization signal.
    Then, the pulse signal detection unit 7 detects the number of pulse signals input from the limiter / amplifier 4 and the voltage controlled oscillator 6 during the period of the gate pulse signal, and the predetermined number according to the detected number of pulse signals. Output voltage.
    The voltage output by the pulse signal detection unit 7 is converted into a digital signal by the analog-to-digital converter 8 and input to the microcomputer 1 through the I 2 C bus control unit 9.
    Then, the microcomputer 1 determines whether the voice intermediate frequency signal is correctly detected as the output signal of the I 2 C bus controller 9.
    That is, when the frequency of the voice carrier signal is 4.5MHz, if the microcomputer 1 controls the filter unit 3 to filter the signal of 4.5MHz, the filter unit 3 detects the voice intermediate frequency signal of 4.5MHz. If the filter unit 3 controls to filter the signal of 5.5 MHz in the case of 5.5 MHz, the middle frequency signal of 5.5 MHz is detected and output from the filter unit 3, and the filter unit in the case of 6.0 MHz If (3) controls to filter the 6.0MHz signal, 6.5MHz intermediate frequency signal is detected and output from the filter unit 3, and if 6.5MHz, the filter unit 3 filters the 6.5MHz signal. In the control, the filter unit 3 detects and outputs an intermediate frequency signal of 6.5 MHz.
    In this way, when there is an intermediate frequency signal output from the filter unit 3, the intermediate frequency signal outputted through the limiter / amplifier 4 and the voltage controlled oscillator 6 oscillate, so that the pulse signal detection unit 7 Detects a predetermined number of pulse signals, outputs a voltage corresponding to the detected pulse signals, and inputs them to the microcomputer 1 through the analog / digital converter 8 and the I 2 C bus controller 9.
    If the frequency of the voice carrier signal is 4.5 MHz, the filter unit 3 filters the signal of 5.5 MHz, 6.0 MHz, or 6.5 MHz, or if the frequency of the voice carrier signal is 5.5 MHz, the filter unit 3 is 4.5. When filtering the signal of MHz, 6.0MHz or 6.5MHz, or the frequency of the voice carrier signal is 6.0MHz, the filter unit 3 filters the signal of 4.5MHz, 5.5MHz or 6.5MHz, or the frequency of the voice carrier signal In the case of 6.5 MHz, when the filter unit 3 filters the signal of 4.5 MHz, 5.5 MHz, or 6.0 MHz, there is no signal output from the filter unit 3, and thus there is no signal output from the limiter / amplifier 4. Since the voltage controlled oscillator 6 also does not output a signal, the pulse signal detector 7 does not detect the pulse signal and continues to output a low potential.
    Therefore, the microcomputer 1 judges that the current filter unit 3 correctly filters the voice intermediate frequency signal when the voltage signal of a predetermined level is input from the I 2 C bus controller 9, and continues to filter the current state. When the signal input from the I 2 C bus controller 9 is low potential, the frequency of the voice intermediate frequency signal and the frequency filtered by the filter unit 3 are determined to be different, so that the filter unit 3 is different. Control to filter the mid frequency signal of frequency.
    As described above, the present invention automatically detects and outputs a voice carrier signal having a different frequency from the voice intermediate frequency signal, so that the user does not need to select a frequency for detecting the voice signal according to the television broadcasting method that the user receives daily, Can be.
    权利要求:
    Claims (2)
    [1" claim-type="Currently amended] A microcomputer for outputting a control signal according to a frequency to be selected from an audio intermediate frequency signal, an operation control unit for outputting operation power according to a control signal output from the microcomputer, and an audio intermediate frequency signal according to an output signal of the operation control unit. A filter unit for selectively outputting signals of 4.5 MHz, 5.5 MHz, 6.0 MHz, and 6.5 MHz, a limiter / amplifier for limiting and amplifying the amplitude of the output signal of the filter unit, and a voice signal from the output signal of the limiter / amplifier An APC to be detected, a voltage controlled oscillator oscillating according to the output signal of the APC and allowing the APC to detect a voice signal, and a pulse output by the limiter / amplifier and the voltage controlled oscillator during a period of a gate pulse signal input at a predetermined period; A pulse signal detector for detecting a signal and outputting the analog signal, and an output signal of the pulse signal detector A voice signal switching circuit of a multi-data receiving device, characterized by converting to a digital signal composed of I 2 C bus controller and outputting to the microcomputer.
    [2" claim-type="Currently amended] The audio signal switching circuit of claim 1, wherein the gate pulse signal is input at a period of a horizontal synchronizing signal.
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    同族专利:
    公开号 | 公开日
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    1996-12-06|Application filed by 김광호, 삼성전자 주식회사
    1996-12-06|Priority to KR1019960062513A
    1998-09-05|Publication of KR19980044420A
    优先权:
    申请号 | 申请日 | 专利标题
    KR1019960062513A|KR19980044420A|1996-12-06|1996-12-06|Audio signal switching circuit of multiple video receiver|
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