JP2005136523A - Television signal processor - Google Patents

Television signal processor Download PDF

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Publication number
JP2005136523A
JP2005136523A JP2003368021A JP2003368021A JP2005136523A JP 2005136523 A JP2005136523 A JP 2005136523A JP 2003368021 A JP2003368021 A JP 2003368021A JP 2003368021 A JP2003368021 A JP 2003368021A JP 2005136523 A JP2005136523 A JP 2005136523A
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output
waveform shaping
shaping circuit
resistor
output waveform
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Japanese (ja)
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Hiroyoshi Konishi
博善 小西
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Maspro Denkoh Corp
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Maspro Denkoh Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a television signal processor using an output waveform shaping circuit for eliminating a noise component such as an overshoot or an undershoot included in an output signal of a crystal oscillator and adapting an output signal voltage of the crystal oscillator to be matched with standards of an input voltage of a circuit connected to the post-stage. <P>SOLUTION: The television signal processor is provided with the output waveform shaping circuit at an output side of the crystal oscillator, and the output waveform shaping circuit is constituted of a first resistor for connecting an input terminal and an output terminal of the output waveform shaping circuit and a second resistor and a capacitor connected in parallel between the output terminal of the output waveform shaping circuit and earth. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は，主にテレビ信号処理装置に関し，詳しくはその基準信号のノイズ低減を図ったものに関する。 The present invention mainly relates to a television signal processing apparatus, and more particularly, to an apparatus for reducing noise of a reference signal.

従来の水晶発振器の出力波形整形回路は，波形整形部の出力に接続された出力部に演算増幅器やＣＭＯＳトランジスタなどを使った電源回路を必要としていた。（例えば，特許文献１参照） A conventional output waveform shaping circuit of a crystal oscillator requires a power supply circuit using an operational amplifier, a CMOS transistor, or the like in an output unit connected to the output of the waveform shaping unit. (For example, see Patent Document 1)

特開平２０００１−２２３５６２号公報Japanese Patent Laid-Open No. 20001-1223562

ところで，従来の信号処理装置に用いられる水晶発振器の出力波形整形回路によると，波形整形部の出力に接続された出力部に演算増幅器やＣＭＯＳトランジスタなどを使った電源回路を必要としていたので，回路が複雑であり，部品点数が多くなり，コストアップを引き起こすといった問題が有った。
そこで本願においては，こうした問題点を解決するためになされたものであり，
その目的は，
水晶発振器の出力波形整形回路の入力端子と出力端子を接続する第１の抵抗器と，出力端子とアース間に接続された第２の抵抗器とコンデンサを備え，
第１の抵抗器とコンデンサで構成される積分回路により，水晶発振器の出力信号に含まれるオーバーシュートやアンダーシュート等のノイズ成分を抑制するとともに，
水晶発振器の発振出力を第１の抵抗器と第２の抵抗器で分圧することにより，その出力電圧を，後段の回路の入力電圧の規格に適合させ，パルスノイズの無い映像信号が安定して得られるテレビ信号処理装置を提供することを課題とする。 By the way, according to the output waveform shaping circuit of the crystal oscillator used in the conventional signal processing apparatus, a power supply circuit using an operational amplifier, a CMOS transistor, or the like is required for the output unit connected to the output of the waveform shaping unit. However, there is a problem that the number of parts increases and the cost increases.
Therefore, in this application, it was made to solve these problems.
The purpose is
A first resistor connecting the input terminal and the output terminal of the output waveform shaping circuit of the crystal oscillator, a second resistor and a capacitor connected between the output terminal and the ground,
The integration circuit composed of the first resistor and capacitor suppresses noise components such as overshoot and undershoot contained in the output signal of the crystal oscillator,
By dividing the oscillation output of the crystal oscillator with the first resistor and the second resistor, the output voltage is adapted to the input voltage standard of the subsequent circuit, and the video signal without pulse noise is stabilized. It is an object of the present invention to provide an obtained television signal processing device.

上記課題を解決するために，請求項1の発明はテレビ信号処理装置において，水晶発振器の出力側に出力波形整形回路を備え，前記出力波形整形回路は出力波形整形回路の入力端子と出力端子を接続する第１の抵抗器と，出力波形整形回路の出力端子とアース間に並列接続された第２の抵抗器とコンデンサで構成される。 In order to solve the above-mentioned problems, the invention of claim 1 is a television signal processing apparatus comprising an output waveform shaping circuit on an output side of a crystal oscillator, and the output waveform shaping circuit includes an input terminal and an output terminal of the output waveform shaping circuit. It comprises a first resistor to be connected, a second resistor and a capacitor connected in parallel between the output terminal of the output waveform shaping circuit and the ground.

以上詳述したように，請求項１の発明によれば，テレビ信号処理装置において，水晶発振器の出力側に出力波形整形回路を備え，前記出力波形整形回路は出力波形整形回路の入力端子と出力端子を接続する第１の抵抗器と，出力波形整形回路の出力端子とアース間に並列接続された第２の抵抗器とコンデンサで構成したので，第１の抵抗器とコンデンサで構成される積分回路により，水晶発振器の出力信号に含まれるオーバーシュートやアンダーシュート等のノイズ成分を除去し，Ｄ／Ａコンバータ，Ａ／Ｄコンバータ，等にノイズの無い基準信号を供給できるので，テレビ信号処理装置からパルスノイズの無い映像信号を得ることができる。 As described above in detail, according to the first aspect of the present invention, in the television signal processing apparatus, the output waveform shaping circuit is provided on the output side of the crystal oscillator, and the output waveform shaping circuit is connected to the input terminal and the output of the output waveform shaping circuit. Since the first resistor that connects the terminal, and the second resistor and the capacitor that are connected in parallel between the output terminal of the output waveform shaping circuit and the ground, the capacitor is configured by the first resistor and the capacitor. The circuit removes noise components such as overshoot and undershoot contained in the output signal of the crystal oscillator, and can supply a reference signal without noise to the D / A converter, A / D converter, etc. Therefore, a video signal without pulse noise can be obtained.

また，水晶発振器の発振出力を第１の抵抗器と第２の抵抗器で分圧することにより，その出力電圧を，後段に接続される回路の入力電圧の規格に低コストで適合させることができる。 Further, by dividing the oscillation output of the crystal oscillator by the first resistor and the second resistor, the output voltage can be adapted to the input voltage standard of the circuit connected to the subsequent stage at a low cost. .

以下に，本発明を具体化した実施形態の例を，図面を基に詳細に説明する。
図１は本発明に係る出力波形整形回路の一例を示し，図２は信号波形の説明図，図３はテレビ信号処理装置の実施例として，テレビ信号のビート除去装置の例を示している。 Hereinafter, an example of an embodiment embodying the present invention will be described in detail with reference to the drawings.
FIG. 1 shows an example of an output waveform shaping circuit according to the present invention, FIG. 2 is an explanatory diagram of signal waveforms, and FIG. 3 shows an example of a television signal beat removing device as an embodiment of a television signal processing device.

図１は本発明に係る出力波形整形回路２００の一例を示す。
本発明による出力波形整形回路２００は，入力端子２０４と出力端子２０５を接続する第１の抵抗器２０１と，出力端子２０５とアース間に並列接続された第２の抵抗器２０２とコンデンサを備え，第１の抵抗器２０１とコンデンサ２０３で構成される積分回路により，水晶発振器１００の出力信号に含まれるオーバーシュート５００やアンダーシュート５０１のノイズ成分を除去している。 FIG. 1 shows an example of an output waveform shaping circuit 200 according to the present invention.
The output waveform shaping circuit 200 according to the present invention includes a first resistor 201 connecting the input terminal 204 and the output terminal 205, a second resistor 202 connected in parallel between the output terminal 205 and the ground, and a capacitor. An integrating circuit composed of the first resistor 201 and the capacitor 203 removes noise components of the overshoot 500 and the undershoot 501 included in the output signal of the crystal oscillator 100.

また，波形整形回路２００に入力された水晶発振器１００の出力信号は，第１の抵抗器２０１と第２の抵抗器２０２で分圧して出力されるので，例えば，水晶発振器１００の出力信号電圧が５Ｖｐ−ｐで，後段に接続されるクロックバッファ３００の入力電圧の規格が３.３Ｖｐ−ｐのように差がある場合，専用の電圧変換用半導体集積回路を設けなくても接続可能となる。
図２（ａ）に，図１に示す出力波形整形回路２００の入力端子２０４の信号波形を示し，図２（ｂ）にその出力端子２０５の信号波形を示す。
図３はテレビ信号処理装置の実施例として，テレビ信号のビート除去装置の例を示している。受信アンテナ４０１から伝送された高周波信号はチューナー４０２で選局され，５８ＭＨｚ帯のＩＦ信号に変換されて直交検波器４０３へ入力される。直交検波回路４０３はこのアナログ信号を復調し，すべての成分をＩ信号としてＡＤコンバータ４０４へ入力するとともに，妨害波成分のみをＱ信号としてＡＤコンバータ４０５へ入力する。
ＡＤコンバータ４０４，４０５は入力されたそれぞれの信号を１０ｂｉｔのディジタル信号に変換して例えばＡＳＩＣで構成された信号処理集積回路４０６へ入力する。信号処理集積回路４０６の内部では，Ｉ信号とＱ信号の差を利用してＩ信号に含まれているビート成分を除去している。信号処理集積回路４０６から出力されたディジタル信号はＤＡコンバータ４０７によりアナログ信号に変換され，ビート成分が除去されたアナログ信号が出力される。
なお，必要に応じて出力端子４０８に変調器を接続すれば，高周波のテレビ信号に変換することができる。
ＡＤコンバータ３０４，３０５，ＤＡコンバータ３０７等に供給される基準信号は，出力波形整形回路２００によりノイズが除去されているので，ノイズによる誤動作やパルスノイズの無い安定な受信が可能となる。
尚，本発明は上記実施の形態に限定されるものではなく，本発明の趣旨を逸脱しない範囲で適宜に変更して実施することも可能である。
本発明ではテレビ信号処理装置として，テレビ信号のビート除去装置の例を示したが，これに限定されること無く，テレビ信号のゴースト除去装置に使用しても同様の効果が得られる。また，周波数変換器，変調器，復調器等のテレビ信号処理装置に使用しても同様の効果が得られる。 Further, since the output signal of the crystal oscillator 100 input to the waveform shaping circuit 200 is divided and output by the first resistor 201 and the second resistor 202, for example, the output signal voltage of the crystal oscillator 100 is If the standard of the input voltage of the clock buffer 300 connected to the subsequent stage is 5 Vp-p, such as 3.3 Vp-p, connection is possible without providing a dedicated voltage conversion semiconductor integrated circuit.
2A shows a signal waveform at the input terminal 204 of the output waveform shaping circuit 200 shown in FIG. 1, and FIG. 2B shows a signal waveform at the output terminal 205. As shown in FIG.
FIG. 3 shows an example of a television signal beat removing apparatus as an embodiment of the television signal processing apparatus. The high frequency signal transmitted from the receiving antenna 401 is selected by the tuner 402, converted into a 58 MHz band IF signal, and input to the quadrature detector 403. The quadrature detection circuit 403 demodulates this analog signal, inputs all components as I signals to the AD converter 404, and inputs only interference wave components as Q signals to the AD converter 405.
The AD converters 404 and 405 convert each input signal into a 10-bit digital signal and input the signal to the signal processing integrated circuit 406 configured by, for example, an ASIC. Inside the signal processing integrated circuit 406, the beat component included in the I signal is removed by utilizing the difference between the I signal and the Q signal. The digital signal output from the signal processing integrated circuit 406 is converted into an analog signal by the DA converter 407, and the analog signal from which the beat component is removed is output.
In addition, if a modulator is connected to the output terminal 408 as necessary, it can be converted into a high-frequency television signal.
Since the reference signal supplied to the AD converters 304 and 305, the DA converter 307, and the like has noise removed by the output waveform shaping circuit 200, stable reception without malfunction due to noise or pulse noise is possible.
It should be noted that the present invention is not limited to the above embodiment, and can be implemented with appropriate modifications without departing from the spirit of the present invention.
In the present invention, an example of a television signal beat removing device is shown as the television signal processing device, but the present invention is not limited to this, and the same effect can be obtained even when used in a television signal ghost removing device. The same effect can be obtained even when used in a television signal processing apparatus such as a frequency converter, a modulator, or a demodulator.

本発明に係る本発明に係る出力波形整形回路２００の一例を示す。1 shows an example of an output waveform shaping circuit 200 according to the present invention. （ａ）は，図１における出力波形整形回路２００の入力端子２０４の信号波形を示し，図２（ｂ）はその出力端子２０５の信号波形を示す。(A) shows the signal waveform of the input terminal 204 of the output waveform shaping circuit 200 in FIG. 1, and FIG. 2 (b) shows the signal waveform of the output terminal 205. テレビ信号処理装置の実施例として，テレビ信号のビート除去装置の例を示す。As an example of a television signal processing apparatus, an example of a television signal beat removing apparatus will be shown.

符号の説明Explanation of symbols

１００…水晶発振器，２００…出力波形整形回路，２０１…第１の抵抗器，２０１…第２の抵抗器，２０３…コンデンサ，２０４…出力波形整形回路の入力端子，２０５…出力波形整形回路の出力端子，３００…クロックバッファ，４０１…受信アンテナ，４０２…チューナー回路，４０３…直交検波回路，４０４…ＡＤコンバータ，４０５…ＡＤコンバータ，４０６…信号処理集積回路（ＡＳＩＣ），４０７…ＤＡコンバータ，４０８…映像出力端子，５００…オーバーシュート，５０１…アンダーシュート。 DESCRIPTION OF SYMBOLS 100 ... Crystal oscillator, 200 ... Output waveform shaping circuit, 201 ... 1st resistor, 201 ... 2nd resistor, 203 ... Capacitor, 204 ... Input terminal of output waveform shaping circuit, 205 ... Output of output waveform shaping circuit Terminals, 300 ... Clock buffer, 401 ... Receiving antenna, 402 ... Tuner circuit, 403 ... Quadrature detection circuit, 404 ... AD converter, 405 ... AD converter, 406 ... Signal processing integrated circuit (ASIC), 407 ... DA converter, 408 ... Video output terminal, 500 ... overshoot, 501 ... undershoot.

Claims (1)

テレビ信号処理装置において，水晶発振器の出力側に出力波形整形回路を備え，前記出力波形整形回路は出力波形整形回路の入力端子と出力端子を接続する第１の抵抗器と，出力波形整形回路の出力端子とアース間に並列接続された第２の抵抗器とコンデンサで構成されることを特徴としたテレビ信号処理装置。 In the television signal processing apparatus, an output waveform shaping circuit is provided on the output side of the crystal oscillator. The output waveform shaping circuit includes a first resistor that connects an input terminal and an output terminal of the output waveform shaping circuit, and an output waveform shaping circuit. A television signal processing apparatus comprising a second resistor and a capacitor connected in parallel between an output terminal and a ground.
JP2003368021A 2003-10-28 2003-10-28 Television signal processor Pending JP2005136523A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005136848A (en) * 2003-10-31 2005-05-26 Maspro Denkoh Corp Digital signal processing circuit and disturbance wave eliminating apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005136848A (en) * 2003-10-31 2005-05-26 Maspro Denkoh Corp Digital signal processing circuit and disturbance wave eliminating apparatus

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