JPH07143525A - Inter-video/audio signal delay measuring method for transmission line of television signal - Google Patents

Inter-video/audio signal delay measuring method for transmission line of television signal

Info

Publication number
JPH07143525A
JPH07143525A JP30746393A JP30746393A JPH07143525A JP H07143525 A JPH07143525 A JP H07143525A JP 30746393 A JP30746393 A JP 30746393A JP 30746393 A JP30746393 A JP 30746393A JP H07143525 A JPH07143525 A JP H07143525A
Authority
JP
Japan
Prior art keywords
signal
video
scene change
circuit
low frequency
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP30746393A
Other languages
Japanese (ja)
Other versions
JP2662849B2 (en
Inventor
Manabu Abe
学 安部
Tetsuo Sasaki
哲雄 佐々木
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ZENKOKU ASAHI HOSO KK
TV Asahi Corp
Original Assignee
ZENKOKU ASAHI HOSO KK
Asahi National Broadcasting Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ZENKOKU ASAHI HOSO KK, Asahi National Broadcasting Co Ltd filed Critical ZENKOKU ASAHI HOSO KK
Priority to JP5307463A priority Critical patent/JP2662849B2/en
Publication of JPH07143525A publication Critical patent/JPH07143525A/en
Application granted granted Critical
Publication of JP2662849B2 publication Critical patent/JP2662849B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43Processing 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
    • H04N21/4302Content synchronisation processes, e.g. decoder synchronisation
    • H04N21/4305Synchronising client clock from received content stream, e.g. locking decoder clock with encoder clock, extraction of the PCR packets
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00Details of television systems
    • H04N5/14Picture signal circuitry for video frequency region
    • H04N5/147Scene change detection

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)

Abstract

PURPOSE:To provide a delay measuring method for measuring time deviation caused by the transmission line for video signals and audio signals even when the signal of a vertical blanking period of the video signal is changed at the transmission line in the case of transmitting the video signal and the audio signal through different transmission lines. CONSTITUTION:One part of the video signal is clamped by a clamp circuit 3, and an integrated output is provided by an integration circuit 4 for each field. The integrated output is held by a sample/hold circuit 5, that held output is differentiated by a differentiation circuit 8, and a scene change is detected. At the timing to detect this scene change, a gate circuit 12 is gated, and the low frequency signal of a low frequency oscillator 11 is superimposed to the audio signal. On the reception side, the scene change is detected from the video signal, the low frequency signal superimposed to the audio signal is extracted, and a pulse is prepared. Delay time is measured by the signal of scene change detection and the pulse signal of the extracted low frequency signal.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、映像信号と音声信号と
を異なる伝送路で送った場合に生じる両信号間の相対的
時間のずれを測定する方法、例えば、映像信号を衛星回
線を利用し、音声信号を地上の回線を介して放送局に送
る場合に生ずる相対的時間のずれを測定してその差を補
正するための測定方法に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for measuring a relative time difference between a video signal and an audio signal when the video signal and the audio signal are transmitted through different transmission paths. However, the present invention relates to a measuring method for measuring a relative time shift occurring when an audio signal is sent to a broadcasting station via a ground line and correcting the difference.

【0002】[0002]

【従来の技術】映像信号と音声信号との伝送路におい
て、映像信号は衛星回線を利用して送り、音声信号は地
上の回線を経由して送る場合がある。映像信号および音
声信号ともに衛星回線を利用する方式では、衛星回線が
不通になった場合、映像のみだけではなく音声も届かな
くなってしまうからである。
2. Description of the Related Art In a transmission path for a video signal and an audio signal, the video signal may be sent using a satellite line and the audio signal may be sent via a terrestrial line. This is because in the method of using the satellite line for both the video signal and the audio signal, when the satellite line is cut off, not only the image but also the voice cannot reach.

【0003】[0003]

【発明が解決しようとする課題】かかる伝送方式におい
て、1回の伝送で音声信号に対し映像信号は約250m
S遅延する。また、映像信号の伝送路に同期をとるため
のフレームシンクロナイザが入ると、映像信号はフレー
ムシンクロナイザ1台でおよそ1フィールド遅延する。
この対策として音声信号の伝送路にオーディオ・シンク
ロナイザという遅延装置を挿入して映像信号と音声信号
との間の時間のずれをなくしている。この遅延時間によ
るずれ調整は、目と耳で確認しながら行っている。
In such a transmission method, a video signal is about 250 m long with respect to an audio signal in one transmission.
S delay. Further, when a frame synchronizer for synchronizing the video signal transmission path is inserted, the video signal is delayed by about one field by one frame synchronizer.
As a countermeasure, a delay device called an audio synchronizer is inserted in the transmission path of the audio signal to eliminate the time lag between the video signal and the audio signal. The adjustment of the shift due to the delay time is performed while checking with the eyes and ears.

【0004】遅延時間をオンラインで測定する方法の一
つとして、テレビジョン信号の送信側で音声信号を整流
して音声信号の変化(音量)の情報を映像信号の垂直ブ
ランキング期間に重畳して伝送し、受け側では映像信号
から得られる音量の変化の情報と音声信号から得られる
音量の変化を比較して遅延時間を測定する方法が提案さ
れている。しかしながら、この方法では映像信号の垂直
ブランキング期間を使用しているので、伝送路で映像プ
ロセッサが入りブランキング整形された場合やテレビジ
ョンの方式変換器(例えばPAL方式をNTSC方式に
変換)に入ると、映像信号からの音量の変化の情報は得
られず測定できないという問題があった。本発明の目的
は、映像信号と音声信号とを異なる伝送路で送る場合、
伝送路中で映像信号の垂直ブランキング期間の信号が変
わっても映像信号と音声信号との伝送路による時間的ず
れをオンラインで測定できる遅延測定方法を提供するこ
とにある。
As one of the methods for measuring the delay time online, the audio signal is rectified on the transmission side of the television signal and the information of the change (volume) of the audio signal is superimposed on the vertical blanking period of the video signal. A method has been proposed in which the delay time is measured by transmitting information on the receiving side and comparing the information on the change in the volume obtained from the video signal with the change in the volume obtained from the audio signal. However, in this method, the vertical blanking period of the video signal is used. Therefore, when a video processor enters and is subjected to blanking shaping in the transmission line, or in a television format converter (for example, PAL format is converted to NTSC format). When entering, there was a problem that information on the change in volume from the video signal could not be obtained and measurement could not be performed. An object of the present invention is to send a video signal and an audio signal through different transmission lines,
It is an object of the present invention to provide a delay measuring method capable of online measuring a time lag between a video signal and an audio signal due to the transmission path even if the signal in the vertical blanking period of the video signal changes in the transmission path.

【0005】[0005]

【課題を解決するための手段】前記目的を達成するため
に本発明によるテレビジョン信号の伝送路による映像・
音声信号間遅延測定方法は、テレビ番組の画面には必ず
シーンチェンジがあるということに着眼し、送信側装置
において、映像シーンが変化する変わり目を送信側シー
ンチェンジ検出部により検出し、その検出信号のタイミ
ングで低周波信号を計測信号として音声信号に重畳し、
受信側装置において、送信側装置からの映像信号につい
て映像シーンが変化する変わり目を受信側シーンチェン
ジ検出部により検出するとともに、送信側装置からの音
声信号に重畳された前記低周波信号を抽出し、前記受信
側シーンチェンジ検出部による検出信号と前記抽出した
低周波信号との時間差を得ることにより映像信号と音声
信号との伝送路の相違による遅延時間の相対的ずれを測
定するように構成してある。
In order to achieve the above-mentioned object, an image by a television signal transmission line according to the present invention is provided.
The method of measuring the delay between audio signals focuses on the fact that there is always a scene change on the screen of a television program, and at the transmitting side device, the changing scene of the video scene is detected by the transmitting side scene change detection unit, and the detection signal is detected. The low frequency signal is superimposed on the audio signal as a measurement signal at the timing of
In the receiving side device, while detecting a transition where the video scene changes with respect to the video signal from the transmitting side device by the receiving side scene change detection section, extracting the low frequency signal superimposed on the audio signal from the transmitting side device, The relative shift of the delay time due to the difference in the transmission path between the video signal and the audio signal is measured by obtaining the time difference between the detection signal by the receiving side scene change detection section and the extracted low frequency signal. is there.

【0006】[0006]

【作用】上記構成によれば、例えば衛星伝送路を利用し
た映像信号と地上伝送路を利用した音声信号において、
垂直ブランキング期間の信号が変わっても両信号間の遅
延量を測定することができる。
According to the above structure, for example, in the case of a video signal using a satellite transmission line and an audio signal using a terrestrial transmission line,
Even if the signal in the vertical blanking period changes, the delay amount between both signals can be measured.

【0007】[0007]

【実施例】以下、図面を参照して本発明をさらに詳しく
説明する。図1は本発明による遅延時間測定法を説明す
るための送信側装置の実施例を示すブロック図である。
映像信号は衛星回線を、音声信号は地上回線をそれぞれ
送信されるものとする。シーンチェンジ検出部1は、ク
ランプ回路3,積分回路4,サンプル・ホールド回路
5,同期分離回路6,第1パルス発生回路7,微分回路
8および第1比較器9より構成されている。
DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a transmitting side device for explaining a delay time measuring method according to the present invention.
It is assumed that the video signal is transmitted over the satellite line and the audio signal is transmitted over the ground line. The scene change detecting section 1 is composed of a clamp circuit 3, an integrating circuit 4, a sample and hold circuit 5, a sync separation circuit 6, a first pulse generating circuit 7, a differentiating circuit 8 and a first comparator 9.

【0008】映像信号は、クランプ回路3によってクラ
ンプされるとともに同期分離回路6で同期信号が分離さ
れる。第1パルス発生回路7では分離された同期信号か
らブランキング期間中に第1と第2のパルス信号が作ら
れる。クランプされた映像信号は積分回路4によって積
分される。積分回路4の積分電圧は、ブランキング期間
中にサンプル・ホールド回路5において第2のパルス信
号によってサンプルホールドされる。この後、第1のパ
ルス信号によって積分回路4がリセットさせられ放電さ
せられる。サンプル・ホールド回路5は、フィールド毎
にAPL(Averege Picture Leve
l)に対応した信号電圧が出力される。
The video signal is clamped by the clamp circuit 3 and the sync signal is separated by the sync separation circuit 6. The first pulse generating circuit 7 produces first and second pulse signals from the separated synchronizing signal during the blanking period. The clamped video signal is integrated by the integrating circuit 4. The integrated voltage of the integrating circuit 4 is sampled and held by the second pulse signal in the sample and hold circuit 5 during the blanking period. After that, the integrating circuit 4 is reset and discharged by the first pulse signal. The sample and hold circuit 5 has an APL (Average Picture Level) for each field.
The signal voltage corresponding to l) is output.

【0009】微分回路8は、サンプルホールド出力を微
分し、フィールド間のAPLの変化の検出により画面の
切替えのタイミングを検出する。微分出力は第1の比較
器9に入力され、一定レベルの参照電圧と比較され、参
照電圧より大きく変化した場合にはシーンチェンジと判
定され、第1の比較器9よりパルスが出力される。計測
信号発生部2は、第2パルス発生回路10,低周波発振
器11およびゲート回路12より構成されている。第2
の比較器9が出力するパルスは第2のパルス発生回路1
0でパルス幅が調整され、ゲート回路12のゲート信号
となる。ゲート回路12はゲート信号が入力している
間、低周波発振器11からの低周波信号をゲート出力す
る。一方、音声信号は、計測用周波帯域の信号を阻止す
る帯域阻止フィルタ13を介して出力され、合成器14
において、帯域阻止フィルタ13を通った音声信号とゲ
ート回路12を通った低周波信号が合成される。
The differentiating circuit 8 differentiates the sample hold output and detects the screen switching timing by detecting the change in APL between fields. The differential output is input to the first comparator 9, is compared with a reference voltage at a constant level, and if it is larger than the reference voltage, it is determined to be a scene change, and the first comparator 9 outputs a pulse. The measurement signal generating section 2 is composed of a second pulse generating circuit 10, a low frequency oscillator 11 and a gate circuit 12. Second
The pulse output from the comparator 9 in the second pulse generation circuit 1
The pulse width is adjusted to 0 and becomes the gate signal of the gate circuit 12. The gate circuit 12 gate-outputs the low-frequency signal from the low-frequency oscillator 11 while the gate signal is being input. On the other hand, the audio signal is output through the band stop filter 13 that blocks the signal in the measurement frequency band, and the synthesizer 14
In, the audio signal passed through the band elimination filter 13 and the low frequency signal passed through the gate circuit 12 are combined.

【0010】図2は、本発明による時間測定法を説明す
るための受信側装置の実施例を示すブロック図である。
シーンチェンジ検出部21は、クランプ回路23,積分
回路24,サンプル・ホールド回路25,同期分離回路
26,第1パルス発生回路27,微分回路28および第
1比較器29より構成され、これら回路は送信側シーン
チェンジ検出部1と同じ構成であり、送られてきた映像
信号よりシーンチェンジ検出を示すパルス信号を出力す
る。一方、音声信号の一部は、計測信号検出部30に入
力される。計測信号検出部30は帯域通過フィルタ3
1,第2比較器32および第2パルス発生回路33より
構成されている。帯域通過フィルタ31は音声信号の低
周波信号が重畳されている帯域のみを通過させる。第2
比較器32はノイズによる誤動作を防止するため一定レ
ベルの参照電圧と帯域通過フィルタ31の出力とを比較
し、帯域通過フィルタ31の出力が参照電圧より大きい
ときに低周波対応のパルスを出力する。
FIG. 2 is a block diagram showing an embodiment of a receiving side device for explaining the time measuring method according to the present invention.
The scene change detection unit 21 is composed of a clamp circuit 23, an integrating circuit 24, a sample and hold circuit 25, a sync separation circuit 26, a first pulse generating circuit 27, a differentiating circuit 28 and a first comparator 29, and these circuits are for transmitting. It has the same configuration as the side scene change detection unit 1 and outputs a pulse signal indicating scene change detection from the transmitted video signal. On the other hand, a part of the audio signal is input to the measurement signal detection unit 30. The measurement signal detection unit 30 includes the band pass filter 3
1, a second comparator 32 and a second pulse generation circuit 33. The band pass filter 31 passes only the band in which the low frequency signal of the audio signal is superimposed. Second
The comparator 32 compares the reference voltage of a constant level with the output of the bandpass filter 31 in order to prevent malfunction due to noise, and outputs a pulse corresponding to a low frequency when the output of the bandpass filter 31 is larger than the reference voltage.

【0011】パルス発生回路33は、低周波対応のパル
スの先頭パルスより立ち上がる一定幅のパルスを出力す
る。遅延パルス幅発生回路34は、上述の第1比較器か
らのパルス信号と第2パルス発生回路33からのパルス
信号とを入力し、両パルスの時間間隔に対応する幅のパ
ルス信号を出力する。パルス幅計測部35は、遅延パル
ス幅発生回路34が出力するパルス信号を計数し、その
計数値を表示するとともに出力する。
The pulse generation circuit 33 outputs a pulse having a constant width which rises from the leading pulse of the pulse corresponding to the low frequency. The delayed pulse width generation circuit 34 inputs the pulse signal from the above-mentioned first comparator and the pulse signal from the second pulse generation circuit 33, and outputs a pulse signal having a width corresponding to the time interval between both pulses. The pulse width measurement unit 35 counts the pulse signals output from the delayed pulse width generation circuit 34, displays the count value, and outputs the count value.

【0012】図3は送信側装置の各回路出力を、図4は
受信側装置の各回路出力をそれぞれ示す波形図である。
図3の各波形を示す記号は、図1の各回路出力に付され
た記号に対応しており、図4の各波形を示す記号は、図
2の各回路出力に付された記号に対応している。図3に
おいて、映像信号のAの位置がシーンチェンジ部分であ
り、Aの位置の直前の映像信号のフィールド部分のAP
Lに対応する信号電圧(サンプル・ホールド出力b)と
Aの位置の直後の映像信号のフィールド部分のAPLに
対応する信号電圧の差分は出力c’となる。リセットパ
ルスP1とサンプル・ホールドパルスP2は、ブランキ
ング期間毎に出力され、積分回路4の出力aをサンプル
・ホールドした後、積分回路4をリセットする。
FIG. 3 is a waveform diagram showing respective circuit outputs of the transmitting side device, and FIG. 4 is a waveform diagram showing respective circuit outputs of the receiving side device.
The symbols showing the waveforms of FIG. 3 correspond to the symbols given to the circuit outputs of FIG. 1, and the symbols showing the waveforms of FIG. 4 correspond to the symbols given to the circuit outputs of FIG. is doing. In FIG. 3, the position A of the video signal is a scene change portion, and the AP of the field portion of the video signal immediately before the position A is the AP.
The difference between the signal voltage corresponding to L (sample and hold output b) and the signal voltage corresponding to APL in the field portion of the video signal immediately after the position of A is output c ′. The reset pulse P1 and the sample and hold pulse P2 are output every blanking period, and after the output a of the integrating circuit 4 is sampled and held, the integrating circuit 4 is reset.

【0013】第1比較器9は、微分回路8の出力cの参
照電圧Ref1より変化が大きくなった位置でシーンチ
ェンジを示すパルス信号dを出力する。パルス信号dは
第2のパルス発生回路10によってパルス幅を拡げたパ
ルスeに変換される。これは低周波信号発振器出力fを
数サイクルに渡って送出するためである。計測信号出力
gとして4サイクル分の低周波信号が出力される。図4
において、微分回路28の出力k,第1比較器29の出
力lは、微分回路8の出力c,第1比較器9の出力dと
同じである。帯域通過フィルタ31を通過した出力h
は、4サイクルの低周波信号であり、検出を安定にする
ため第2の比較器32で参照電圧Ref2と比較され、
4個のパルス信号iに変換される。
The first comparator 9 outputs a pulse signal d indicating a scene change at a position where the change of the output c of the differentiating circuit 8 is larger than the reference voltage Ref1. The pulse signal d is converted by the second pulse generating circuit 10 into a pulse e having a widened pulse width. This is because the low frequency signal oscillator output f is transmitted over several cycles. A low frequency signal for four cycles is output as the measurement signal output g. Figure 4
In, the output k of the differentiating circuit 28 and the output l of the first comparator 29 are the same as the output c of the differentiating circuit 8 and the output d of the first comparator 9. Output h passed through band pass filter 31
Is a low frequency signal of 4 cycles, which is compared with the reference voltage Ref2 by the second comparator 32 to stabilize the detection,
It is converted into four pulse signals i.

【0014】第2のパルス発生回路33では4個のパス
ル信号iの先頭のパルスの立ち上がりで一定幅のパルス
mが作られる。このパルスmに対し第1比較器29の出
力lは、t1 mSだけ遅れている。したがって、衛星回
線を経由してきた映像信号は地上回線を経由してきた音
声信号に対しt1 mSだけ遅延している。遅延パルス幅
発生回路34はこのt1 mSを幅とするパルスnを出力
し、パルス幅計測部35で計数されることになる。この
実施例では、映像信号が遅れる場合の例について説明し
たが、音声信号が遅れる場合も同様に測定できる。かか
る場合には図4のパルスmと第1比較器出力lとの発生
時期が逆になり、第1比較器出力lが先に出力されるこ
とになる。
In the second pulse generation circuit 33, a pulse m having a constant width is generated at the leading edge of the leading pulse of the four pulse signals i. The output l of the first comparator 29 is delayed by t 1 mS with respect to this pulse m. Therefore, the video signal transmitted via the satellite line is delayed by t 1 mS with respect to the audio signal transmitted via the ground line. The delay pulse width generation circuit 34 outputs the pulse n having a width of t 1 mS, and is counted by the pulse width measuring unit 35. In this embodiment, the case where the video signal is delayed has been described, but the case where the audio signal is delayed can be similarly measured. In such a case, the generation timings of the pulse m and the first comparator output 1 in FIG. 4 are reversed, and the first comparator output 1 is output first.

【0015】図5は、シーンチェンジ検出部の他の実施
例を示すブロック図であり、フィールド相関を利用した
シーンチェンジ検出部の回路図、図6は図5のシーンチ
ェンジ検出部の各回路部の出力を示す波形図である。図
6の各波形を示す記号は、図5の各回路出力に付された
記号に対応している。LPF51は映像信号aのサブキ
ャリアの影響を避けるため輝度信号のみを通過させるフ
ィルタである。フィールドメモリ52はLPF51の出
力信号bを1フィールド遅延させた輝度信号cを出力す
る。減算部53はシーンチェンジがなく輝度信号にフィ
ールド相関があるときは、ほとんど出力がない。しか
し、シーンチェンジにより画面がかわるとその瞬間フィ
ールド相関がなくなるため、減算部53はbとcの信号
の差に対応する信号dを出力する。
FIG. 5 is a block diagram showing another embodiment of the scene change detection section, a circuit diagram of the scene change detection section using field correlation, and FIG. 6 is each circuit section of the scene change detection section of FIG. 5 is a waveform diagram showing the output of FIG. The symbols showing the respective waveforms in FIG. 6 correspond to the symbols given to the respective circuit outputs in FIG. The LPF 51 is a filter that passes only the luminance signal in order to avoid the influence of the subcarrier of the video signal a. The field memory 52 outputs a luminance signal c obtained by delaying the output signal b of the LPF 51 by one field. The subtractor 53 outputs almost no output when there is no scene change and there is a field correlation in the luminance signal. However, when the screen changes due to a scene change, the instantaneous field correlation disappears, so the subtraction unit 53 outputs a signal d corresponding to the difference between the signals b and c.

【0016】第1比較器54は現フィールドと直前のフ
ィールドの画面の対応する画素部分の相関を判別するた
めのもので、画像の動きなどによる誤差動作の防止も含
めてdの信号が参照電圧Ref1以上のレベルになった
とき、信号eを出力する。フィールド積分部55は画面
内のフィールド相関の割合を検出するため、第1比較器
54の出力信号eをフィールド毎に積分し、フィールド
毎の積分電圧信号fを出力する。第2比較器56は積分
電圧信号fが参照電圧Ref2以上のレベルになったと
き、フィールド相関無し(シーンチェンジ)と判別し信
号gを出力する。パルス発生回路57は信号gの立ち上
がりによりシーンチェンジ・パルスhを出力する。な
お、本実施例における送り側のシーンチェンジ検出部の
前段に、映像信号レベルを外部操作により1フィールド
期間低下させ、APLおよびフィールド相関を変化させ
る疑似的なシーンチェンジ発生部を付加すれば、映像信
号にシーンチェンジがない期間においても遅延時間の測
定が可能である。
The first comparator 54 is for discriminating the correlation between the corresponding pixel portions of the screen of the current field and the previous field, and the signal of d includes the reference voltage including prevention of error operation due to movement of the image. When the level becomes Ref1 or higher, the signal e is output. The field integrator 55 integrates the output signal e of the first comparator 54 for each field and outputs the integrated voltage signal f for each field in order to detect the ratio of the field correlation in the screen. When the integrated voltage signal f reaches a level equal to or higher than the reference voltage Ref2, the second comparator 56 determines that there is no field correlation (scene change) and outputs the signal g. The pulse generation circuit 57 outputs a scene change pulse h at the rising edge of the signal g. It should be noted that if a pseudo scene change generation unit that lowers the video signal level for one field period by an external operation and changes the APL and the field correlation is added in front of the scene change detection unit on the sending side in the present embodiment, the image can be displayed. The delay time can be measured even during the period when there is no scene change in the signal.

【0017】図7は、シーンチェンジ検出部のさらに他
の実施例を説明するための図であり、フレーム相関を利
用したシーンチェンジ検出部の各回路部の出力を示す波
形図である。フレーム相関によるシーンチェンジ検出部
は、図5のフィールドメモリ52をフレームメモリに、
フィールド積分部55をフレーム積分部にそれぞれ置き
換えることにより構成することができる。LPF51の
出力信号bをフレームメモリにより1フレーム遅延させ
た輝度信号cを出力することによってフィールド相関に
よるシーンチェンジ検出部と同様に検出することができ
る。図7において、連続する2フィールド(1フレー
ム)分について第1の比較器により比較し、減算部出力
を2フィールド分積分しシーンチェンジパルスを出力す
るものである。したがって、減算部出力,第1比較器入
出力,フレーム積分値および第2比較器入力期間がフレ
ーム単位になり、サンプルホールドパルスおよびリセッ
トパルスも1フレーム周期で出力される。そして、第1
比較器および第2比較器に入力する参照電圧Ref1お
よびRef2のレベルはフレームに対応して変えている
他はフィールド相関の場合と同様である。
FIG. 7 is a diagram for explaining still another embodiment of the scene change detection unit, and is a waveform diagram showing the output of each circuit unit of the scene change detection unit using frame correlation. The scene change detection unit based on frame correlation uses the field memory 52 of FIG. 5 as a frame memory,
It can be configured by replacing the field integrator 55 with a frame integrator. By outputting the luminance signal c obtained by delaying the output signal b of the LPF 51 by one frame by the frame memory, it is possible to detect the same as in the scene change detection unit by the field correlation. In FIG. 7, two consecutive fields (one frame) are compared by the first comparator, and the subtractor output is integrated for two fields to output a scene change pulse. Therefore, the subtractor output, the first comparator input / output, the frame integration value, and the second comparator input period are in frame units, and the sample hold pulse and the reset pulse are also output in one frame cycle. And the first
The levels of the reference voltages Ref1 and Ref2 input to the comparator and the second comparator are the same as in the case of the field correlation except that they are changed according to the frame.

【0018】[0018]

【発明の効果】以上、説明したように本発明は、異なる
伝送路で伝送される映像信号と音声信号において、送信
側でシーンチェンジ部分を検出し、そのタイミングを示
す信号を低周波信号で音声信号に重畳し、受信側では同
じくシーンチェンジ部分を示す信号を検出するとともに
音声信号から重畳された低周波信号を抽出し、これら信
号の間の時間差を測定するものである。したがって、伝
送路に映像プロセッサが入って垂直ブランキング期間が
整形されたり、テレビジョン方式が変換されたりした場
合でも、それらには影響を受けずに映像信号と音声信号
との時間的ずれを計測することができる。
As described above, according to the present invention, in a video signal and an audio signal transmitted through different transmission paths, a scene change portion is detected on the transmitting side, and a signal indicating the timing is detected by a low frequency signal. The signal is superimposed on the signal, the signal indicating the scene change portion is also detected on the receiving side, the superimposed low frequency signal is extracted from the audio signal, and the time difference between these signals is measured. Therefore, even if the vertical blanking period is shaped by the video processor in the transmission line or the television system is converted, the time difference between the video signal and the audio signal is measured without being affected by them. can do.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明による遅延測定法を説明するための送信
側装置の実施例を示すブロック図である。
FIG. 1 is a block diagram showing an embodiment of a transmitting side apparatus for explaining a delay measuring method according to the present invention.

【図2】本発明による遅延測定法を説明するための受信
側装置の実施例を示すブロック図である。
FIG. 2 is a block diagram showing an embodiment of a receiving side device for explaining a delay measuring method according to the present invention.

【図3】図1の送信側装置の各回路部の出力を示す波形
図である。
FIG. 3 is a waveform diagram showing an output of each circuit unit of the transmission side device of FIG.

【図4】図2の受信側装置の各回路部の出力を示す波形
図である。
FIG. 4 is a waveform diagram showing an output of each circuit unit of the reception side apparatus of FIG.

【図5】シーンチェンジ検出部の他の実施例を示すブロ
ック図である。
FIG. 5 is a block diagram showing another embodiment of the scene change detection unit.

【図6】図5のシーンチェンジ検出部の各回路部の出力
を示す波形図である。
6 is a waveform diagram showing an output of each circuit unit of the scene change detection unit of FIG.

【図7】シーンチェンジ検出部のさらに他の実施例を説
明するための波形図である。
FIG. 7 is a waveform diagram for explaining still another embodiment of the scene change detection unit.

【符号の説明】[Explanation of symbols]

1…送信側シーンチェンジ検出部 2…送信側計測信号発生部 3…送信側クランプ回路 4…送信側積分回路 5…送信側サンプル・ホールド回路 6…送信側同期分離回路 7…送信側第1パルス発生回路 8…送信側微分回路 9…送信側第1比較器 10…送信側第2パルス発生回路 11…低周波発振器 12…ゲート回路 13…帯域阻止フィルタ 14…合成部 21…受信側シーンチェンジ検出部 22…遅延時間検出部 23…受信側クランプ回路 24…受信側積分回路 25…受信側サンプル・ホールド回路 26…受信側同期分離回路 27…受信側第1パルス発生回路 28…受信側微分回路 29…受信側第1比較器 30…受信側計測信号検出部 31…帯域通過フィルタ 32…第2比較器 33…受信側第2パルス発生回路 34…遅延パルス幅発生回路 35…パルス幅計測部 36…表示部 51…LPF 52…フィールドメモリ 53…減算部 54…第1比較器 55…フィールド積分部 56…第2比較器 57…パルス発生回路 1 ... Transmission side scene change detection section 2 ... Transmission side measurement signal generation section 3 ... Transmission side clamp circuit 4 ... Transmission side integration circuit 5 ... Transmission side sample and hold circuit 6 ... Transmission side sync separation circuit 7 ... Transmission side first pulse Generation circuit 8 ... Transmission side differentiation circuit 9 ... Transmission side first comparator 10 ... Transmission side second pulse generation circuit 11 ... Low frequency oscillator 12 ... Gate circuit 13 ... Band stop filter 14 ... Synthesis section 21 ... Reception side scene change detection Part 22 ... Delay time detecting part 23 ... Receiving side clamp circuit 24 ... Receiving side integrating circuit 25 ... Receiving side sample and hold circuit 26 ... Receiving side synchronization separation circuit 27 ... Receiving side first pulse generating circuit 28 ... Receiving side differentiating circuit 29 ... reception side first comparator 30 ... reception side measurement signal detection unit 31 ... band pass filter 32 ... second comparator 33 ... reception side second pulse generation circuit 34 ... delayed pulse Generating circuit 35 ... pulse width measuring unit 36 ... display unit 51 ... LPF 52 ... field memory 53 ... subtractor 54 ... first comparator 55 ... field integrating unit 56 ... second comparator 57 ... pulse generating circuit

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 送信側装置において、映像シーンが変化
する変わり目を送信側シーンチェンジ検出部により検出
し、 その検出信号のタイミングで低周波信号を計測信号とし
て音声信号に重畳し、 受信側装置において、送信側装置からの映像信号につい
て映像シーンが変化する変わり目を受信側シーンチェン
ジ検出部により検出するとともに、 前記送信側装置からの音声信号に重畳された前記低周波
信号を抽出し、 前記受信側シーンチェンジ検出部による検出信号と前記
抽出した低周波信号との時間差を得ることにより映像信
号と音声信号との伝送路の相違による遅延時間の相対的
ずれを測定するように構成したことを特徴とするテレビ
ジョン信号の伝送路による映像・音声信号間遅延測定方
法。
1. A transmitting side device detects a transition point where a video scene changes, by a transmitting side scene change detecting section, superimposes a low frequency signal as a measurement signal on an audio signal at the timing of the detection signal, and a receiving side device A receiving side scene change detection unit detects a transition of a video scene of a video signal from the transmitting side device, and extracts the low frequency signal superimposed on the audio signal from the transmitting side device; It is characterized in that the relative shift of the delay time due to the difference in the transmission path of the video signal and the audio signal is measured by obtaining the time difference between the detection signal by the scene change detection section and the extracted low frequency signal. A method for measuring the delay between video and audio signals by the transmission path of television signals.
【請求項2】 前記送信側および受信側シーンチェンジ
検出部は、1フィールド毎に映像信号レベルを積分する
積分回路と、 前記積分回路の積分値をサンプリングするサンプル・ホ
ールド回路と、 前記サンプル・ホールド回路出力を微分する微分回路
と、 前記微分回路出力が所定レベルを越えた場合、前記低周
波信号を重畳するための信号等、シーンチェンジ時間検
出用の信号を出力する比較器とから構成したことを特徴
とする請求項1記載のテレビジョン信号の伝送路による
映像・音声信号間遅延測定方法。
2. The transmitting-side and receiving-side scene change detection units include an integrating circuit that integrates a video signal level for each field, a sample hold circuit that samples an integrated value of the integrating circuit, and the sample hold. And a comparator that outputs a signal for scene change time detection such as a signal for superimposing the low frequency signal when the output of the differentiator exceeds a predetermined level. The method for measuring the delay between the video and audio signals by the transmission path of the television signal according to claim 1.
【請求項3】 前記送信側および受信側シーンチェンジ
検出部は、各フィールド間またはフレーム間の映像信号
レベルを比較し、所定のレベル差を得たとき検出信号を
出力するフィールド相関検出部またはフレーム相関検出
部である請求項1記載のテレビジョン信号の伝送路によ
る映像・音声信号間遅延測定方法。
3. The field-correlation detection unit or the frame, in which the transmission-side and reception-side scene change detection units compare video signal levels between fields or frames and output a detection signal when a predetermined level difference is obtained. The method for measuring the delay between a video signal and an audio signal by the transmission path of a television signal according to claim 1, which is a correlation detecting unit.
JP5307463A 1993-11-12 1993-11-12 Measuring method of delay between video and audio signals by transmission path of television signal Expired - Lifetime JP2662849B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5307463A JP2662849B2 (en) 1993-11-12 1993-11-12 Measuring method of delay between video and audio signals by transmission path of television signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5307463A JP2662849B2 (en) 1993-11-12 1993-11-12 Measuring method of delay between video and audio signals by transmission path of television signal

Publications (2)

Publication Number Publication Date
JPH07143525A true JPH07143525A (en) 1995-06-02
JP2662849B2 JP2662849B2 (en) 1997-10-15

Family

ID=17969380

Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
JP (1) JP2662849B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100694060B1 (en) * 2004-10-12 2007-03-12 삼성전자주식회사 Apparatus and method for synchronizing video and audio

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02274070A (en) * 1989-03-10 1990-11-08 Tektronix Inc Delay time compensation
JPH05236513A (en) * 1992-02-21 1993-09-10 Shibasoku Co Ltd Method for counting transmission delay time difference between television video signal and audio signal

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02274070A (en) * 1989-03-10 1990-11-08 Tektronix Inc Delay time compensation
JPH05236513A (en) * 1992-02-21 1993-09-10 Shibasoku Co Ltd Method for counting transmission delay time difference between television video signal and audio signal

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100694060B1 (en) * 2004-10-12 2007-03-12 삼성전자주식회사 Apparatus and method for synchronizing video and audio
US7692724B2 (en) 2004-10-12 2010-04-06 Samsung Electronics Co., Ltd. Method and apparatus to synchronize audio and video

Also Published As

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