WO2014030460A1 - 受信装置及び受信方法 - Google Patents
受信装置及び受信方法 Download PDFInfo
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- WO2014030460A1 WO2014030460A1 PCT/JP2013/069119 JP2013069119W WO2014030460A1 WO 2014030460 A1 WO2014030460 A1 WO 2014030460A1 JP 2013069119 W JP2013069119 W JP 2013069119W WO 2014030460 A1 WO2014030460 A1 WO 2014030460A1
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- frequency signal
- intermediate frequency
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- 238000000034 method Methods 0.000 title claims description 11
- 230000000670 limiting effect Effects 0.000 claims description 25
- 238000010586 diagram Methods 0.000 description 10
- 239000008186 active pharmaceutical agent Substances 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 6
- 229920006395 saturated elastomer Polymers 0.000 description 4
- 238000001994 activation Methods 0.000 description 3
- 230000002238 attenuated effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000002829 reductive effect Effects 0.000 description 3
- 230000004913 activation Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000007257 malfunction Effects 0.000 description 2
- 230000036961 partial effect Effects 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/38—Demodulator circuits; Receiver circuits
- H04L27/3809—Amplitude regulation arrangements
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G1/00—Details of arrangements for controlling amplification
- H03G1/0005—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal
- H03G1/0088—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal using discontinuously variable devices, e.g. switch-operated
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/3052—Automatic control in amplifiers having semiconductor devices in bandpass amplifiers (H.F. or I.F.) or in frequency-changers used in a (super)heterodyne receiver
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/426—Internal components of the client ; Characteristics thereof
- H04N21/42607—Internal components of the client ; Characteristics thereof for processing the incoming bitstream
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/438—Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving encoded video stream packets from an IP network
- H04N21/4382—Demodulation or channel decoding, e.g. QPSK demodulation
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- 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
- H04N5/52—Automatic gain control
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- 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
- H04N5/455—Demodulation-circuits
Definitions
- the present disclosure relates to a receiving apparatus and a receiving method for receiving a signal such as a broadcast wave, and particularly to a technique for controlling the amplitude of a signal input to a demodulator to an appropriate value.
- analog / digital (A / D) conversion processing for converting a received analog signal into a digital signal is performed at the stage of demodulation processing for demodulating a received signal.
- a / D analog / digital
- high definition of television broadcasting has progressed, and high resolution has been required for A / D converters that perform A / D conversion processing.
- the high-resolution A / D converter has high sensitivity, so even if a small noise flows or the voltage changes slightly, it may malfunction. In the worst case, the demodulator may be destroyed. End up.
- the amplitude of the signal output from the high-frequency receiver is the input signal required by the demodulator. There is a possibility of exceeding the allowable amount of amplitude. If the maximum value of the amplitude of the signal output from the high-frequency receiver is larger than the allowable value of the input signal allowed by the demodulator, the performance of the demodulator may deteriorate or the demodulator itself may be destroyed. End up.
- the signal output from the high frequency receiver is limited to the amplitude desired by the demodulator by the AGC (Automatic Gain Control) control performed from the demodulator to the high frequency receiver. Injected.
- AGC Automatic Gain Control
- the limiting function may not be in time, and an amplitude larger than the desired amplitude may be injected transiently.
- Patent Document 1 discloses a closed loop based on the information on the difference between a voltage control amplifier output signal for performing control for supplying a signal having a constant amplitude to a subsequent circuit such as a demodulation circuit and a predetermined reference amplitude. It is described that the control speed of the control circuit is changed. According to the technique described in Patent Document 1, when the amplitude of the voltage control amplifier output signal is increased, the control speed of the closed loop control circuit is controlled to be increased. As a result, a saturation error does not occur at the rising edge of the signal amplitude, and the possibility that the A / D converter in the subsequent stage is saturated can be reduced.
- a protective element such as a diode
- a protective element such as a diode
- a protective element is arranged between the high-frequency receiver and the input terminal of the demodulator, a component mounted on hardware is added, resulting in an increase in product cost.
- the present disclosure has been made in view of such a point, and can reliably limit the amplitude of a signal output from a high-frequency receiver within a range of amplitude allowed by a demodulator without adding a new component.
- the purpose is to do so.
- the receiving apparatus includes a high-frequency reception processing unit and an amplitude limiting unit, and the configuration and function of each unit are as follows.
- the high frequency reception processing unit converts the high frequency signal into an intermediate frequency signal or a baseband signal.
- the amplitude limiting unit is a first amplitude that is an amplitude of the intermediate frequency signal or the baseband signal output from the high frequency reception processing unit, and an amplitude that is allowed in the demodulation unit that demodulates the intermediate frequency signal or the baseband signal. Limit to 2 amplitudes.
- the receiving method of the present disclosure is performed according to the following procedure.
- a high frequency signal is converted into an intermediate frequency signal or a baseband signal.
- the amplitude limiting unit allows the first amplitude which is the amplitude of the intermediate frequency signal or baseband signal output from the high frequency reception processing unit to be an amplitude allowed in the demodulation unit that demodulates the intermediate frequency signal or baseband signal.
- a second amplitude which is the first amplitude which is the amplitude of the intermediate frequency signal or baseband signal.
- the amplitude of the intermediate frequency signal or baseband signal input to the demodulator is limited within the range of amplitude allowed by the demodulator.
- the amplitude of the intermediate frequency signal or the baseband signal input to the demodulation unit is reliably limited within the range of amplitude allowed by the demodulation unit. It is possible to prevent the demodulation performance from being degraded and the demodulator from being destroyed.
- FIG. 3 is a block diagram illustrating a configuration example of a receiving device according to an embodiment of the present disclosure. It is a block diagram showing an example of composition of a high frequency receiving part by one embodiment of this indication. It is a block diagram showing an example of composition of an amplitude limiting part by one embodiment of this indication.
- FIG. 3 is a circuit diagram illustrating a circuit configuration example of an amplitude limiting unit according to an embodiment of the present disclosure. It is explanatory drawing which shows the outline
- FIG. 11 is a block diagram illustrating a configuration example of a receiving device according to a modification example of the present disclosure.
- FIG. 1 is a block diagram illustrating a configuration example of a receiving device 100 according to the present embodiment.
- the receiving device 100 includes a high frequency receiving unit 2 that converts a high frequency signal received by the antenna 1 into an intermediate frequency signal (hereinafter referred to as an “intermediate IF signal”), and a TS (Transport Stream) signal by demodulating the intermediate IF signal.
- a demodulator 3 for outputting and a decoder 4 for decoding the video signal and the audio signal from the TS signal are provided.
- the receiving device 100 receives a broadcast signal of digital terrestrial television broadcasting is taken as an example, but the present invention is not limited to this.
- the present invention is also applicable to a receiving apparatus that receives other broadcast waves such as digital satellite broadcast and cable TV broadcast.
- the receiving apparatus 100 can also be applied to a receiving apparatus that receives signals other than broadcast waves.
- the high frequency receiving unit 2 includes a high frequency reception processing unit 200 and an amplitude limiting unit 210.
- the high frequency reception processing unit 200 includes an LNA (low noise amplifier) 21, a band filter 22, a VCO (Voltage Controlled Oscillator) 23, an amplifier 24, a frequency divider 25, a mixer 26, and an amplifier. 27.
- LNA low noise amplifier
- VCO Voltage Controlled Oscillator
- the LNA 21 amplifies the high frequency signal obtained by the antenna 1 (see FIG. 1) and outputs the amplified signal to the band filter 22.
- the band filter 22 passes only a signal in the vicinity of a desired reception frequency to be received and outputs the signal to the mixer 26.
- the VCO 23 generates a frequency corresponding to a voltage applied from a phase comparator (not shown).
- the amplifier 24 amplifies the frequency generated by the VCO 23 and inputs it to the frequency divider 25.
- the frequency divider 25 divides the frequency generated by the VCO 23 and amplified by the amplifier 24 into 1 / N and outputs the result.
- the mixer 26 mixes the frequency input from the frequency divider 25 and the frequency of the received signal that has passed through the band-pass filter 22 to generate an intermediate IF signal, and outputs the generated intermediate IF signal to the amplifier 27.
- the amplifier 27 amplifies the intermediate IF signal and outputs it to the amplitude limiter 210.
- FIG. 3 is a principle diagram illustrating an outline of the function of the amplitude limiting unit 210.
- the amplitude limiting unit 210 includes a gain control unit 210G that amplifies the gain of the input intermediate IF signal to a predetermined level, and an attenuation control unit 210D that attenuates the intermediate IF signal amplified by the gain control unit 210G.
- the gain control unit 210G has an amplifier unit Ap including an operational amplifier.
- Amplifier unit Ap is input via a negative input resistance R IM is input via a feedback gain setting unit GS M to set the gain of the signal having an amplitude of minus direction, the plus-side input resistance R IP , and a feedback gain setting unit GS P for setting the gain of the signal having an amplitude of plus direction.
- Feedback gain setting unit GS M and the feedback gain setting unit GS P is configured as a variable resistor.
- Gain of the signal having an amplitude of the negative direction is determined by the negative input resistor R IM and feedback gain setting unit GS M, the gain of the signal having an amplitude of plus direction, feedback gain setting and the positive input resistor R IP It is determined by the Department GS P.
- a minus-side output resistor ROM is connected to the tip of a terminal that outputs a signal having an amplitude in the minus direction
- a plus-side output resistor is connected to the tip of a terminal that outputs a signal having an amplitude in the plus direction.
- ROP is connected.
- a signal transmission path passing through the negative output resistance R OM, and the transmission path of the signal passing through the positive output resistance R OP, is connected to the partial pressure attenuation section DS.
- the partial pressure attenuation unit DS is configured as a variable resistor, and the other end is grounded.
- the gain amplified by the gain controller 210G is attenuated to a level suitable for the amplitude tolerance of the A / D converter 31 (see FIG. 1) in the demodulator 3 by the voltage dividing attenuator DS configured in this way. Is done.
- FIG. 4 illustrates only the configuration of each unit that determines the gain or attenuation amount of a signal having a negative amplitude among the configurations shown as the principle diagram in FIG. 3, and the signal having a positive amplitude.
- the configuration for determining the gain or attenuation is not shown.
- the gain control unit 210G has an operational amplifier 211, and a negative input terminal of the operational amplifier 211 is connected to a signal input terminal IN via an input resistor 212. Is connected.
- the intermediate IF signal output from the high frequency reception processing unit 200 (see FIG. 2) is input to the input terminal IN.
- a resistor 213, a resistor 214, and a resistor 215 as feedback resistors are connected in parallel to each other.
- a switch 216, a switch 217, and a switch 218 Connected to the resistor 213, the resistor 214, and the resistor 215 are a switch 216, a switch 217, and a switch 218 that switch the connection of the resistors on and off.
- These resistors 213 to 215 and switches 216 to 218 form the feedback gain setting unit GS M shown in FIG.
- the resistors 213, 214, and 215 have feedback resistance values of R G1 , R G2 , and R G3 , respectively.
- a control unit 210C including a CPU (Central Processing Unit) or the like.
- the gain of the operational amplifier 211 in a state where the switch 216 is turned on and the resistor 213 (feedback resistance value R G1 ) is selected can be obtained by a calculation formula of feedback resistance value R G1 / input resistance value R IN .
- a reference DC power source 220 voltage Vdc is connected. Further, between the input resistor 219 and the positive input terminal of the operational amplifier 211, a bypass of a resistance value R BPS (hereinafter also referred to as “bypass resistance value R BP ”) having one end installed in the ground potential portion (GND).
- R BPS resistance value R BPS
- a resistor 221 is connected via the switch 222. The on / off control of the switch 222 is also performed by the control unit 210C.
- the DC voltage Vdc of the reference DC power supply 220 is generated by dividing the power supply voltage Vcc of the receiving apparatus 100, and is generally set to a voltage lower than the power supply voltage Vcc.
- the terminal voltage at the positive side minus terminal of the operational amplifier 211 is always set when the circuit is activated.
- the value is less than the DC voltage Vdc.
- the terminal voltage (DC bias voltage) at the plus side minus terminal of the operational amplifier 211 can be set to a value smaller than the DC voltage Vdc.
- the attenuation controller 210D has a DC resistor 223 connected to the output terminal of the operational amplifier 211 of the gain controller 210G. Further, a voltage dividing resistor 225 selectively connected to GND via the switch 224, a voltage dividing resistor 227 selectively connected to GND via the switch 226, and selectively connected to GND via the switch 228. And a voltage dividing resistor 229 connected thereto.
- the voltage dividing resistor 225, the voltage dividing resistor 227, and the voltage dividing resistor 229 are assumed to have voltage dividing resistance values of R D1 , R D2 , and R D3 , respectively.
- the voltage dividing resistor 225, the voltage dividing resistor 227, the voltage dividing resistor 229, the switch 224, the switch 226, and the switch 228 form the voltage dividing attenuation unit DS shown in FIG.
- On / off control of the switch 224, the switch 226, and the switch 228 is performed by the control unit 210C.
- the intermediate IF signal whose gain is controlled by the gain control unit 210G is input to the attenuation control unit 210D.
- the attenuation amount (voltage division ratio) of the signal attenuated by the attenuation control unit 210D is the resistance of the resistance in the connection state among the voltage dividing resistor 225, the voltage dividing resistor 227, and the voltage dividing resistor 229 constituting the voltage dividing attenuation unit DS.
- a combined resistance value RD N ( "N" is a natural number) is determined by the ratio of the DC resistance R D of the DC resistance.
- the amount of attenuation in a state where the switch 224 is turned on and the voltage dividing resistor 225 (voltage dividing resistance value R D1 ) is selected is the calculation of the resistance value R D1 / (resistance value R D + resistance value R D1 ). It is calculated by the formula.
- the amount of signal attenuation (the upper limit value of the voltage appearing at the output terminal OT) is determined. ) Can be set to any value.
- the attenuation amount in the attenuation control unit 210D the amplitude of the signal input to the A / D converter 31 (see FIG. 1) in the demodulation unit 3 connected to the subsequent stage is changed to the A / D converter 31. It is possible to keep the amplitude within the allowable amplitude value range.
- Attenuating the signal by the attenuation control unit 210D limits the amplitude of the intermediate IF signal superimposed on the DC voltage output from the operational amplifier 211.
- the gain control unit 210G amplifies the amount corresponding to this attenuation.
- the level of the intermediate IF signal can be made constant.
- the DC bias voltage Vdc ⁇ the divided resistance value R D DC voltage obtained by N / (DC resistance value R D + voltage dividing resistance value R DN ) and feedback resistance value R GN / input resistance value R IN ⁇ voltage dividing resistance value R DN / (DC resistance value R D + min
- the dynamic range of the output voltage can be set to a desired range by a combination of AC gains determined by the piezoresistance value R DN ).
- the amplitude limiting unit 210 switches the switch SW I and the switch SW O so that the attenuation amount A, the attenuation amount B, and the attenuation amount C having different values are allowed by the demodulator 3 in the subsequent stage. It is possible to switch freely according to the amplitude value.
- an option of “no restriction” may be selected. For example, to allow the selection of "No limit” in the configuration shown in Figure 4, an additional resistor further one in parallel with the feedback gain setting unit GS M is connected to it, the attenuation control unit 210D All switches 224, 226, 228 are turned off.
- the high frequency reception processing unit 200 of the receiving device 100 is smaller than the allowable amplitude value of the demodulation unit 3, the high frequency reception processing unit 200 and the demodulation unit 3 The connection between them can be optimally constructed.
- the power supply voltage Vcc of the receiving apparatus 100 can be input to the A / D converter 31 only by changing the attenuation amount setting. Can be within the range of the allowable amplitude value. This eliminates the need to manufacture a plurality of types of receiving circuits (increase the number of circuit models) in accordance with the type of power supply voltage Vcc of the receiving apparatus 100.
- the operational amplifier 211 itself in the gain control unit 210G has a dynamic range, when a voltage exceeding the dynamic range is applied, the output voltage of the operational amplifier 211 is saturated. That is, even when a high voltage is instantaneously input to the input terminal IN due to noise mixing or the like, the voltage of the signal output from the operational amplifier 211 is always a value within the dynamic range of the operational amplifier. Thereby, it is possible to reliably prevent a voltage exceeding the absolute maximum rated voltage of the A / D converter 31 from being applied to the input terminal of the A / D converter 31 in the subsequent stage.
- the bypass resistor 221 of the gain control unit 210G is controlled to be turned on when the receiving device 100 is activated, the DC bias voltage at the time of circuit activation is always less than the DC voltage Vdc. It becomes the value of.
- the voltage appearing at the output terminal of the operational amplifier 211 can be kept low even during a period in which the terminal voltage at the positive input terminal of the operational amplifier 211 and the voltage appearing at the output terminal of the operational amplifier 211 do not match when the circuit is activated. It becomes.
- the present invention is not limited to this.
- the gain control unit 210G and the attenuation control unit may be disconnected.
- the output terminal OT becomes the ground potential in a DC manner.
- the attenuation amount can be dynamically set in the time direction such that the attenuation amount that is attenuated by the amplitude limiter 210 is increased when the circuit is activated, and the attenuation amount is decreased during normal operation after the activation operation is completed. May be. Even if comprised in this way, the effect equivalent to the effect acquired by embodiment mentioned above can be acquired.
- the present invention is not limited to this.
- a plurality of so-called limiter circuits may be provided according to the number of attenuations to be set, and these may be switched.
- the present invention is not limited thereto. It is not something. You may apply to the structure which receives satellite digital broadcasting etc. by a direct conversion system.
- FIG. 6 is a block diagram showing a configuration example of the high-frequency receiving unit 2 ⁇ in the case of performing detection by the direct conversion method.
- the high frequency receiving unit 2 ⁇ includes a high frequency reception processing unit 200 ⁇ , an amplitude limiting unit 210I, and an amplitude limiting unit 210Q.
- the high frequency reception processing unit 200 ⁇ includes an LNA 41, a VCO 42, an amplifier 43, a frequency divider 44, a phase shifter 45, mixers 46 and 37, amplifiers 48 and 41, bandpass filters 49 and 42, and an amplifier. 50 and 53.
- the LNA 41 amplifies the high frequency signal obtained by the antenna 1 (see FIG. 1) and outputs it to the mixers 46 and 37.
- the VCO 42 generates a frequency corresponding to a voltage applied from a phase comparator (not shown).
- the amplifier 53 amplifies the frequency generated by the VCO 42 and inputs it to the frequency divider 44.
- the frequency divider 44 divides the frequency generated by the VCO 42 and amplified by the amplifier 53 into 1 / N and outputs the result.
- the phase shifter 45 generates two output signals (phase-shifted signals) that are orthogonal to each other, and supplies the output signals to the mixer 46 and the mixer 47.
- the mixer 46 mixes the received signal amplified by the LNA 41 and the signal output from the phase shifter 45 to generate an I signal and outputs it to the amplifier 48.
- the mixer 47 mixes the reception signal amplified by the LNA 41 and the signal output from the phase shifter 45 to generate a Q signal and outputs the Q signal to the amplifier 51.
- the I signal amplified by the amplifier 48 is limited to a predetermined frequency band by passing through the band filter 49, is then amplified by the amplifier 50, and is supplied to the amplitude limiter 210 ⁇ / b> I.
- the Q signal amplified by the amplifier 51 is limited to a predetermined frequency band by passing through the band filter 52, is then amplified by the amplifier 53, and is supplied to the amplitude limiter 210Q. Since the functions of the amplitude limiting unit 210I and the amplitude limiting unit 210Q are the same as those of the amplitude limiting unit 210 described above, description thereof is omitted here.
- this indication can also take the following structures.
- a high frequency reception processing unit that converts a high frequency signal into an intermediate frequency signal or a baseband signal;
- a first amplitude that is the amplitude of the intermediate frequency signal or baseband signal output from the high frequency reception processing unit is a second amplitude that is allowed in a demodulation unit that demodulates the intermediate frequency signal or baseband signal.
- a receiving device including an amplitude limiting unit that limits the amplitude.
- the demodulation unit includes an analog / digital conversion unit that converts the intermediate frequency signal or the baseband signal into a digital signal, and the second amplitude is an amplitude allowed in the analog / digital conversion unit.
- the reception device includes an attenuation control unit that controls the magnitude of the second amplitude by switching at least two attenuation amounts having different values.
- the amplitude control unit controls the gain of the intermediate frequency signal or baseband signal output from the high frequency reception processing unit, and attenuates the intermediate frequency signal or baseband signal whose gain is controlled.
- the receiving apparatus according to any one of (1) to (3), further including a gain control unit that outputs to the control unit.
- the gain control unit includes an operational amplifier to which the intermediate frequency signal or the baseband signal is input, and an excessive output portion of the first amplitude that exceeds a saturated output voltage of the operational amplifier is the saturated output.
- the receiving device according to any one of (1) to (4), which is limited to a value within a voltage range.
- the attenuation control unit includes a DC resistance connected to the output terminal of the operational amplifier of the gain control unit, between the DC resistance and the output terminal of the intermediate frequency signal or the baseband signal, and a ground potential unit. And at least two voltage dividing resistors that are selectively connected to each other, and the amount of attenuation that controls the magnitude of the second amplitude depends on whether or not the at least two voltage dividing resistors are selected.
- the receiving device according to (5), which is controlled.
- a control unit is further provided, and the gain control unit includes an input resistor connected between an input terminal to which the intermediate frequency signal or the baseband signal is input and a negative output terminal of the operational amplifier, and the operational amplifier. And at least two gain control resistors that are selectively connected between the negative side input terminal and the output terminal of the operational amplifier, and the control unit selects or does not select the at least two gain control resistors.
- the receiving apparatus according to any one of (1) to (6), wherein the gain control amount is controlled by controlling the gain.
- a bypass resistor is selectively connected between the reference DC power source connected to the negative input terminal of the operational amplifier and the negative input terminal so as to selectively switch connection / disconnection with the ground potential section.
- the receiving device according to any one of (5) to (7), wherein the control unit sets the bypass resistor in a connected state when the receiving device is activated.
- An open / close switch that switches a connection state between the gain control unit and the attenuation control unit,
- the controller according to any one of (1) to (7), wherein when the receiver is activated, the controller performs control to turn off the open / close switch in a state where the connection state of the bypass resistor is switched to connection. .
- Receiver 200 ... High frequency reception processing unit 210 ... Amplitude limiting unit 210C ... Control unit 210D ... Attenuation control unit 210G ... Gain controller, 210I ... Amplitude limiter, 210Q ... Amplitude limiter, 211 ... Operational amplifier, 212 ... Input resistance, 213 to 215 ... Resistance, 216 to 218 ... Switch, 219 ... Input resistance, 220 ... Reference Flow supply, 221 ... bypass resistor, 222 ... switch, 223 ... DC resistance, 224 ... switch, 225 ... dividing resistors, 226 ... switch
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Abstract
Description
る可能性をゼロにできない。
まず、本開示の一実施形態に係る受信装置について、図1を参照して説明する。図1は
、本実施の形態による受信装置100の構成例を示すブロック図である。受信装置100は、アンテナ1が受信した高周波信号を中間周波信号(以下、「中間IF信号」と称する)に変換する高周波受信部2と、中間IF信号を復調してTS(Transport Stream)信号を出力する復調部3と、TS信号から映像信号及び音声信号を復号するデコード部4とを備える。
次に、高周波受信部2の内部構成例について、図2のブロック図を参照して説明する。本実施の形態の高周波受信部2は、高周波受信処理部200と、振幅制限部210とよりなる。高周波受信処理部200は、LNA(低雑音増幅器)21と、帯域フィルタ22と、VCO(Voltage Controlled Oscillator:電圧制御発振器)23と、増幅器24と、分周器25と、混合器26と、増幅器27とを含む。
図3は、振幅制限部210の機能の概要を説明する原理図である。振幅制限部210は、入力される中間IF信号の利得を所定のレベルまで増幅させる利得制御部210Gと、利得制御部210Gで増幅された中間IF信号を減衰させる減衰制御部210Dよりなる。
電源電圧Vcc×バイパス抵抗値RBPS/(バイパス抵抗値RBPS+抵抗値RREF)…式1
伝達特性TC=抵抗値RG1/入力抵抗値RIN×分圧抵抗値RD1/(直流抵抗値RD+分圧抵抗値RD1)…式2
N/(直流抵抗値RD+分圧抵抗値RDN)で求められる直流電圧と、帰還抵抗値RGN/入力抵抗値RIN×分圧抵抗値RDN/(直流抵抗値RD+分圧抵抗値RDN)で求められる交流利得の組み合わせにより、出力電圧のダイナミックレンジを所望の範囲に設定することができる。
なお、上述した実施の形態では、利得制御部210Gの帰還抵抗と減衰制御部210Dの分圧抵抗をそれぞれ3つ設けた例をあげたが、この個数に限定されるものではない。例えばそれぞれ1つのみを設けてもよく、4つ以上の数を設けてもよい。1つのみを設ける場合には、利得制御部210Gと減衰制御部210Dの機能を有する回路を、受信装置100に対して着脱可能に構成し、A/D変換器31の振幅許容値に合わせたものを選択できるようにすれば、様々な電源電圧Vccにも対応可能となる。
イッチ224,スイッチ226,スイッチ228のいずれかのスイッチをオンにすれば、出力端子OTが直流的にグランド電位となる。
(1)高周波信号を中間周波信号又はベースバンド信号に変換する高周波受信処理部と、
前記高周波受信処理部から出力された前記中間周波信号又はベースバンド信号の振幅である第1の振幅を、前記中間周波信号又はベースバンド信号を復調する復調部において許容される振幅である第2の振幅に制限する振幅制限部とを備えた受信装置。
(2)前記復調部は、前記中間周波信号又はベースバンド信号をデジタル信号に変換するアナログ/デジタル変換部を備え、前記第2の振幅は、前記アナログ/デジタル変換部において許容される振幅である(1)に記載の受信装置。
(3)前記振幅制御部は、値の異なる少なくとも2つの減衰量を切り替えることにより前記第2の振幅の大きさを制御する減衰制御部を備える(1)又は(2)に記載の受信装置。
(4)前記振幅制御部は、前記高周波受信処理部から出力された前記中間周波信号又はベースバンド信号の利得を制御して、前記利得が制御された前記中間周波信号又はベースバンド信号を前記減衰制御部に出力する、利得制御部を備える(1)~(3)のいずれかに記載の受信装置。
(5)前記利得制御部は、前記中間周波信号又はベースバンド信号が入力されるオペアンプを備え、前記第1の振幅のうちの、前記オペアンプの飽和出力電圧を超える過大出力部分は、前記飽和出力電圧の範囲内の値に制限される(1)~(4)のいずれかに記載の受信装置。
(6)前記減衰制御部は、前記利得制御部の前記オペアンプの出力端子に接続される直流抵抗と、前記直流抵抗と前記中間周波信号又はベースバンド信号の出力端子との間と、接地電位部との間で、選択的に接続される少なくとも2つの分圧抵抗とを有し、前記第2の振幅の大きさを制御する減衰量は、前記少なくとも2つの分圧抵抗の選択または非選択により制御される(5)に記載の受信装置。
(7)制御部をさらに備え、前記利得制御部は、前記中間周波信号又はベースバンド信号が入力される入力端子と前記オペアンプのマイナス側出力端子との間に接続される入力抵抗と、前記オペアンプのマイナス側入力端子と前記オペアンプの出力端子との間で選択的に接続される、少なくとも2つの利得制御抵抗とを有し、前記制御部は、前記少なくとも2つの利得制御抵抗を選択または非選択させることにより前記利得の制御量を制御する(1)~(6)のいずれかに記載の受信装置。
(8)前記オペアンプのマイナス側入力端子に接続される基準直流電源と、前記マイナス側入力端子との間には、接地電位部との接続・非接続が選択的に切り替えられるバイパス抵抗が接続され、前記制御部は、当該受信装置の起動時に前記バイパス抵抗を接続状態とする(5)~(7)のいずれかに記載の受信装置。
(9)前記利得制御部と前記減衰制御部との接続状態を切り替える開閉スイッチを備え、
前記制御部は、当該受信装置の起動時には、前記バイパス抵抗の接続状態を接続に切り替えた状態で前記開閉スイッチをオフにする制御を行う(1)~(7)のいずれかに記載の受信装置。
(10)アンテナが受信した高周波信号を抽出して中間周波信号又はベースバンド信号に変換することと、
前記中間周波信号又はベースバンド信号の振幅である第1の振幅を、前記中間周波信号又はベースバンド信号を復調する復調部において許容される振幅である第2の振幅に制限することとを含む受信方法。
Claims (10)
- 高周波信号を中間周波信号又はベースバンド信号に変換する高周波受信処理部と、
前記高周波受信処理部から出力された前記中間周波信号又はベースバンド信号の振幅である第1の振幅を、前記中間周波信号又はベースバンド信号を復調する復調部において許容される振幅である第2の振幅に制限する振幅制限部とを備えた
受信装置。 - 前記復調部は、前記中間周波信号又はベースバンド信号をデジタル信号に変換するアナログ/デジタル変換部を備え、前記第2の振幅は、前記アナログ/デジタル変換部において許容される振幅である
請求項1に記載の受信装置。 - 前記振幅制限部は、値の異なる少なくとも2つの減衰量を切り替えることにより前記第2の振幅の大きさを制御する減衰制御部を備える
請求項2に記載の受信装置。 - 前記振幅制限部は、前記高周波受信処理部から出力された前記中間周波信号又はベースバンド信号の利得を制御して、前記利得が制御された前記中間周波信号又はベースバンド信号を前記減衰制御部に出力する、利得制御部を備える
請求項3に記載の受信装置。 - 前記利得制御部は、前記中間周波信号又はベースバンド信号が入力されるオペアンプを備え、前記第1の振幅のうちの、前記オペアンプの飽和出力電圧を超える過大出力部分は、前記飽和出力電圧の範囲内の値に制限される
請求項4に記載の受信装置。 - 前記減衰制御部は、前記利得制御部の前記オペアンプの出力端子に接続される直流抵抗と、前記直流抵抗と前記中間周波信号又はベースバンド信号の出力端子との間と、接地電位部との間で、選択的に接続される少なくとも2つの分圧抵抗とを有し、前記第2の振幅の大きさを制御する減衰量は、前記少なくとも2つの分圧抵抗の選択または非選択により制御される
請求項5に記載の受信装置。 - 制御部をさらに備え、
前記利得制御部は、前記中間周波信号又はベースバンド信号が入力される入力端子と前記オペアンプのマイナス側出力端子との間に接続される入力抵抗と、前記オペアンプのマイナス側入力端子と前記オペアンプの出力端子との間で選択的に接続される、少なくとも2つの帰還抵抗とを有し、
前記制御部は、前記少なくとも2つの帰還抵抗を選択または非選択させることにより前記利得の制御量を制御する
請求項6に記載の受信装置。 - 前記オペアンプのマイナス側入力端子に接続される基準直流電源と、前記マイナス側入力端子との間には、接地電位部との接続・非接続が選択的に切り替えられるバイパス抵抗が接続され、
前記制御部は、当該受信装置の起動時に前記バイパス抵抗を接続状態とする
請求項7に記載の受信装置。 - 前記利得制御部と前記減衰制御部との接続状態を切り替える開閉スイッチを備え、
前記制御部は、当該受信装置の起動時には、前記バイパス抵抗の接続状態を接続に切り替えた状態で前記開閉スイッチをオフにする制御を行う
請求項7に記載の受信装置。 - 高周波信号を中間周波信号又はベースバンド信号に変換することと、
前記中間周波信号又はベースバンド信号の振幅である第1の振幅を、前記中間周波信号又はベースバンド信号を復調する復調部において許容される振幅である第2の振幅に制限することとを含む
受信方法。
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KR20157002732A KR20150045427A (ko) | 2012-08-20 | 2013-07-12 | 수신 장치 및 수신 방법 |
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ITVA20040005A1 (it) * | 2004-02-06 | 2004-05-06 | St Microelectronics Sa | Rete di attenuazione variabile |
JP2006033553A (ja) * | 2004-07-20 | 2006-02-02 | Nippon Antenna Co Ltd | 増幅装置 |
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