JPH042364U - - Google Patents
Info
- Publication number
- JPH042364U JPH042364U JP4250490U JP4250490U JPH042364U JP H042364 U JPH042364 U JP H042364U JP 4250490 U JP4250490 U JP 4250490U JP 4250490 U JP4250490 U JP 4250490U JP H042364 U JPH042364 U JP H042364U
- Authority
- JP
- Japan
- Prior art keywords
- dropout
- audio signal
- analog audio
- detection
- output
- 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.)
- Pending
Links
- 238000001514 detection method Methods 0.000 claims description 11
- 238000012544 monitoring process Methods 0.000 claims description 4
- 230000005236 sound signal Effects 0.000 claims 7
- 230000006835 compression Effects 0.000 claims 2
- 238000007906 compression Methods 0.000 claims 2
- 230000003287 optical effect Effects 0.000 claims 2
- 238000005259 measurement Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 3
- 238000003708 edge detection Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Landscapes
- Television Signal Processing For Recording (AREA)
Description
第１図は本考案の一実施例の構成を示すブロツ
ク図。第２図は本考案の一実施例の作用の説明に
供するタイミング図。第３図は従来例の構成を示
すブロツク図。第４図は従来例のドロツプアウト
検出の説明に供する波形図。
１……リミタ増幅器、１１……切替回路、１２
……立上りエツジ検出回路、１３……単安定マル
チバイブレータ、１４……ローパスフイルタ、１
５……リトリガブル単安定マルチバイブレータ、
１６……疑似パルス発生回路、１７……ドロツプ
アウト期間監視回路。
FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. FIG. 2 is a timing chart for explaining the operation of an embodiment of the present invention. FIG. 3 is a block diagram showing the configuration of a conventional example. FIG. 4 is a waveform diagram for explaining dropout detection in a conventional example. 1...Limiter amplifier, 11...Switching circuit, 12
... Rising edge detection circuit, 13 ... Monostable multivibrator, 14 ... Low pass filter, 1
5... Retriggerable monostable multivibrator,
16...Pseudo pulse generation circuit, 17...Dropout period monitoring circuit.
Claims (1)
波により再生する方式の光デイスク再生装置にお
けるＦＭアナログ音声信号のドロツプアウト検出
回路であつて、一定幅パルスの疎密波に変換され
たＦＭアナログ音声信号の周波数を監視してドロ
ツプアウトを検出するドロツプアウト検出手段か
らなることを特徴とするドロツプアウト検出回路
。 (2) ＦＭアナログ音声信号をパルスカウント検
波により再生する方式の光デイスク再生装置にお
けるＦＭアナログ音声信号のドロツプアウトを補
償するドロツプアウト補償回路であつて、一定幅
パルスの疎密波に変換されたＦＭアナログ音声信
号の周波数を監視してドロツプアウトを検出する
ドロツプアウト検出手段と、ドロツプアウト検出
出力発生時から擬似パルスを出力する擬似パルス
発生手段と、ＦＭアナログ音声信号を増幅するリ
ミツタ増幅器の出力に代つてドロツプアウト検出
出力発生時から擬似パルス発生手段の出力パルス
を選択してパルスカウント検波のために出力する
切替手段と、ドロツプアウト検出出力の発生時か
ら計時を開始して所定期間経過時から前値ホール
ドに切替るための前値ホールド指示信号を前値ホ
ールド手段へ出力するドロツプアウト期間監視手
段とを備えたことを特徴とするドロツプアウト補
償回路。[Claims for Utility Model Registration] (1) A dropout detection circuit for an FM analog audio signal in an optical disc playback device that uses pulse count detection to reproduce the FM analog audio signal, which is converted into a compression wave of constant width pulses. 1. A dropout detection circuit comprising dropout detection means for detecting dropout by monitoring the frequency of an FM analog audio signal. (2) A dropout compensation circuit that compensates for the dropout of an FM analog audio signal in an optical disc playback device that uses pulse count detection to reproduce the FM analog audio signal, which is a dropout compensation circuit that compensates for the dropout of an FM analog audio signal that is converted into a compression wave of constant width pulses. dropout detection means for detecting dropout by monitoring the frequency of the signal, pseudo pulse generation means for outputting a pseudo pulse from the time the dropout detection output occurs, and dropout detection output in place of the output of the limiter amplifier for amplifying the FM analog audio signal. A switching means for selecting the output pulse of the pseudo pulse generation means from the time of generation and outputting it for pulse count detection, and a switching means for starting time measurement from the time of generation of the dropout detection output and switching to previous value hold after a predetermined period has elapsed. 1. A dropout compensation circuit comprising dropout period monitoring means for outputting a previous value hold instruction signal to the previous value holding means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4250490U JPH042364U (en) | 1990-04-23 | 1990-04-23 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4250490U JPH042364U (en) | 1990-04-23 | 1990-04-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH042364U true JPH042364U (en) | 1992-01-09 |
Family
ID=31554105
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4250490U Pending JPH042364U (en) | 1990-04-23 | 1990-04-23 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH042364U (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56140779A (en) * | 1980-04-01 | 1981-11-04 | Sharp Corp | Detector of signal defect |
| JPS5740713A (en) * | 1980-08-25 | 1982-03-06 | Hitachi Ltd | Audio signal reproducing device equipped with noise eliminating circuit |
-
1990
- 1990-04-23 JP JP4250490U patent/JPH042364U/ja active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56140779A (en) * | 1980-04-01 | 1981-11-04 | Sharp Corp | Detector of signal defect |
| JPS5740713A (en) * | 1980-08-25 | 1982-03-06 | Hitachi Ltd | Audio signal reproducing device equipped with noise eliminating circuit |
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