JPH0433600Y2 - - Google Patents
Info
- Publication number
- JPH0433600Y2 JPH0433600Y2 JP13390481U JP13390481U JPH0433600Y2 JP H0433600 Y2 JPH0433600 Y2 JP H0433600Y2 JP 13390481 U JP13390481 U JP 13390481U JP 13390481 U JP13390481 U JP 13390481U JP H0433600 Y2 JPH0433600 Y2 JP H0433600Y2
- Authority
- JP
- Japan
- Prior art keywords
- output
- component
- light
- pass filter
- record
- 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.)
- Expired
Links
- 238000001514 detection method Methods 0.000 claims description 11
- 238000010586 diagram Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 230000007257 malfunction Effects 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
Landscapes
- Indexing, Searching, Synchronizing, And The Amount Of Synchronization Travel Of Record Carriers (AREA)
Description
【考案の詳細な説明】
本考案はレコード自動演奏装置におけるレコー
ド盤の曲間部検出装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a record disc interval detection device in an automatic record player.
従来のレコード盤の曲間部検出装置は第１図の
ような構成であつた。すなわち、レコード盤１に
対向して発光素子２、受光素子３を配置し、レコ
ード盤１の曲間部１ａでの反射光を受光素子３に
よつて受光し、受光出力を増幅器４によつて増幅
した後、この増幅出力と基準電圧Esと比較回路５
によつて比較し、この比較出力を曲間部検出信号
として出力するようにした構成である。 A conventional track interval detection device for a record disc has a configuration as shown in FIG. That is, a light-emitting element 2 and a light-receiving element 3 are arranged opposite to the record 1, and the light-receiving element 3 receives the light reflected from the track interval 1a of the record 1, and the light-receiving output is transmitted to the amplifier 4. After amplification, this amplified output and the reference voltage E s are compared with the comparison circuit 5.
The configuration is such that the comparison output is output as an inter-track detection signal.
従来の構成においては、一定の基準電圧Esに対
して、増幅器４の出力、すなわち、受光出力が発
光素子２、受光素子３の特性のバラツキや温度特
性などによつて第３図ａに示すように変化し、そ
の直流成分も変化する。したがつて、この直流成
分が基準電圧Esより大きくなるような変化をした
場合、直流成分が基準電圧Esより大きい領域で
は、たとえそれが音溝部であつても、比較出力が
得られ、これが曲間部検出信号として出力され
る。 In the conventional configuration, for a constant reference voltage Es , the output of the amplifier 4, that is, the light receiving output, varies as shown in FIG. The DC component also changes. Therefore, if this DC component changes to become larger than the reference voltage E s , a comparison output will be obtained in the region where the DC component is larger than the reference voltage E s , even if it is in the sound groove. This is output as an inter-track detection signal.
これは、基準電圧Esと受光出力の正確な比較が
できず、誤動作が起こりやすいことを意味してい
る。 This means that accurate comparison between the reference voltage E s and the received light output is not possible, and malfunctions are likely to occur.
また、基準電圧Esは発光素子２、受光素子３の
個々の特性に合わせて設定しなければならないな
どの欠点があつた。 Further, there was a drawback that the reference voltage E s had to be set according to the individual characteristics of the light emitting element 2 and the light receiving element 3.
本考案はこのような従来欠点を改良したもの
で、以下図において説明する。 The present invention improves on these conventional drawbacks, and will be explained below with reference to the drawings.
第２図において、第１図の従来例と同一部分に
ついては同一符号を付し、その説明は省略する。 In FIG. 2, the same parts as those in the conventional example shown in FIG. 1 are designated by the same reference numerals, and their explanation will be omitted.
第２図において、受光出力（増幅器(4)の出力）
（第３図ａ）をローパスフイルタ６を通して直流
成分（第３図ｂ点線）を取出すともに、上記受光
出力をハイパスフイルタ７を通して交流信号成分
（第３図ｂ実線）を取出す。上記受光出力は第３
図ａに示すように、発光素子２、受光素子３の特
性のバラツキや温度特性等によつて、その直流成
分は第３図ｂ点線のように変化する。 In Figure 2, the received light output (output of amplifier (4))
(FIG. 3a) is passed through a low-pass filter 6 to extract a DC component (dotted line in FIG. 3B), and the received light output is passed through a high-pass filter 7 to extract an AC signal component (solid line in FIG. 3B). The above received light output is the third
As shown in FIG. 3A, the DC component changes as indicated by the dotted line in FIG. 3B due to variations in the characteristics of the light emitting element 2 and the light receiving element 3, temperature characteristics, and the like.
また、上記交流信号成分はレコード盤１の曲間
部１ａの受光出力ａおよび音溝部の受光出力ｂか
らなるが、実際には上記ハイパスフイルタ７の理
想的な遮断特性の実現が困難であるため、その出
力には上記ハイパスフイルタ７によつて完全に除
去できない直流成分が残存することになり、第３
図ｂ実線に示すようにわずかに変化する。この残
存する直流成分の変化は上記受光出力の直流成分
（第３図ｂ点線）より小さい。 Further, the AC signal component is composed of the light receiving output a of the inter-track section 1a of the record 1 and the light receiving output b of the sound groove section, but in reality it is difficult to realize the ideal cutoff characteristic of the high pass filter 7. , a DC component that cannot be completely removed by the high-pass filter 7 remains in the output, and the third
It changes slightly as shown by the solid line in Figure b. The change in this remaining DC component is smaller than the DC component of the received light output (dotted line in FIG. 3B).
ここで、ハイパスフイルタ７の出力（すなわ
ち、受光出力の交流信号成分）に残存するの直流
成分は、ローパスフイルタ６の出力、すなわち、
受光出力の直流成分（第３図ｂ点線）を越えるこ
とはない。 Here, the DC component remaining in the output of the high-pass filter 7 (that is, the AC signal component of the received light output) is the output of the low-pass filter 6, that is,
The DC component of the received light output (dotted line in Figure 3b) will not be exceeded.
その後、上記受光出力の直流成分（第３図ｂ点
線）すなわちローパスフイルタ６の出力を基準電
圧として、この基準電圧と上記交流信号成分とを
比較回路５によつて比較し、この比較出力（第３
図ｃ）を曲間部検出信号として取出すようにした
構成である。 Thereafter, using the DC component of the received light output (dotted line in FIG. 3B), that is, the output of the low-pass filter 6 as a reference voltage, this reference voltage and the AC signal component are compared by the comparison circuit 5, and this comparison output (the 3
This configuration is such that the signal shown in FIG. c) is extracted as an inter-track detection signal.
以上の構成は、ローパスフイルタ６から出力さ
れる直流成分、すなわち上記受光出力の直流成分
（第３図ｂ点線）を基準電圧とし、この基準電圧
とハイパスフイルタ７から出力される受光出力の
交流信号成分とを比較するようにした構成を有す
るので、換言すれば、ハイパスフイルター７の出
力とローパスフイルタ６の出力とを減算している
ので、第３図ｂの斜線を引いた部分が検出され、
この検出出力を曲間部検出信号として取出すの
で、受光出力の直流成分の変化に影響されること
なく、レコード盤１の曲間部１ａの受光出力ａの
みが検出できる。したがつて、発光素子２、受光
素子３の特性のバラツキや温度特性等による受光
出力の変化とは無関係に曲間部１ａの検出ができ
る。すなわち、ハイパスフイルター７を設けない
場合、その受光出力は，第３図ａに示すように、
直流成分に受光出力成分とノイズ成分とが重畳さ
れたものとなり、この受光出力成分とノイズ成分
の直流レベルは直流成分の変化に対応して変化す
る。したがつて、受光出力（第３図ａ）のノイズ
成分の直流レベルはローパスフイルタ６の出力、
すなわち直流成分と同一になり、ノイズ成分のピ
ークレベル（瞬時値）は、ローパスフイルタ６の
出力より常に高いことになる。 The above configuration uses the DC component output from the low-pass filter 6, that is, the DC component of the above-mentioned light reception output (dotted line in FIG. 3) as a reference voltage, and uses this reference voltage and the AC signal of the light reception output output from the high-pass filter 7. In other words, since the output of the high-pass filter 7 and the output of the low-pass filter 6 are subtracted, the shaded part in FIG. 3b is detected.
Since this detection output is extracted as a song interval detection signal, only the light reception output a of the song interval 1a of the record disc 1 can be detected without being affected by changes in the DC component of the light reception output. Therefore, the inter-curved portion 1a can be detected regardless of variations in the characteristics of the light emitting element 2 and the light receiving element 3, changes in the received light output due to temperature characteristics, and the like. That is, when the high-pass filter 7 is not provided, the received light output is as shown in FIG. 3a.
The received light output component and the noise component are superimposed on the DC component, and the DC levels of the received light output component and the noise component change in response to changes in the DC component. Therefore, the DC level of the noise component of the received light output (Fig. 3a) is the output of the low-pass filter 6,
That is, it becomes the same as the DC component, and the peak level (instantaneous value) of the noise component is always higher than the output of the low-pass filter 6.
このローパスフイルタ６の出力と上記受光出力
（第３図ａ）とを比較した場合、その比較出力は、
受光出力から直流成分を除去したもの、すなわち
受光出力成分とノイズ成分とからなり、このノイ
ズ成分は除去できないことになる。 When comparing the output of this low-pass filter 6 and the above-mentioned received light output (Fig. 3a), the comparative output is:
It consists of the received light output with the DC component removed, that is, the received light output component and a noise component, and this noise component cannot be removed.
したがつて、このノイズ成分がある一定のレベ
ルを越えると、比較出力が得られ、誤動作の原因
となる。 Therefore, if this noise component exceeds a certain level, a comparative output will be obtained, causing malfunction.
ところが、本考案のように、ハイパスフイルタ
ー７を設けた場合、パイパスフイルター７の出
力、すなわち交流信号成分は、第３図ｂの実線に
示すように、受光出力から直流成分を除去したも
のとなりる。この場合、ハイパスフイルター７の
遮断特性によつて、受光出力から直流成分を完全
に除去したものとはならず、多少の直流成分（低
周波成分）を含んでいる。 However, when the high-pass filter 7 is provided as in the present invention, the output of the bypass filter 7, that is, the AC signal component, is obtained by removing the DC component from the received light output, as shown by the solid line in FIG. 3b. . In this case, due to the cutoff characteristics of the high-pass filter 7, the DC component is not completely removed from the received light output, but some DC component (low frequency component) is included.
ここで、第３図ｂの実線と点線とで示されるよ
うに、ハイパスフイルター７の出力のノイズ成分
の直流レベルは、ほとんどの直流成分が除去され
ているため、ローパスフイルタ６の出力を越える
ことはなく、また、ノズル成分のピークレベル
（瞬時値）も、ローパスフイルタ６の出力を越え
ることはない。 Here, as shown by the solid line and dotted line in FIG. 3b, the DC level of the noise component of the output of the high-pass filter 7 exceeds the output of the low-pass filter 6 because most of the DC components have been removed. Furthermore, the peak level (instantaneous value) of the nozzle component does not exceed the output of the low-pass filter 6.
したがつて、ハイパスフイルター７の出力（第
３図ｂ実線）とローパスフイルタ６の出力（第３
図ｂの点線）とを比較した場合、受光出力のノイ
ズ成分が除去されて、第３図ｂの斜線を引いた部
分が検出され、この検出出力が曲間部検出信号と
して取り出される。 Therefore, the output of the high-pass filter 7 (solid line in Figure 3b) and the output of the low-pass filter 6 (the third
When compared with the dotted line in FIG. 3B, the noise component of the received light output is removed and the shaded portion in FIG.
以上のように、本考案は、受光素子３の受光出
力をローパスフイルタ６、ハイパスフイルタ７に
それぞれ入力し、両フイルタ６，７の出力の比較
出力を曲間部検出信号としたので、受光出力の変
化とは無関係にレコード盤１の曲間部１ａを正確
に検出できる優れた利点を有する。 As described above, in the present invention, the light receiving output of the light receiving element 3 is input to the low pass filter 6 and the high pass filter 7, respectively, and the comparison output of the outputs of both filters 6 and 7 is used as the inter-track detection signal, so that the light receiving output is It has an excellent advantage of being able to accurately detect the inter-track portion 1a of the record 1 regardless of changes in the number of tracks.
第１図は従来のレコード盤の曲間部検出装置の
構成を示す図、第２図は本考案のレコード盤の曲
間部検出装置の構成を示す図、第３図は同、説明
図である。
１はレコード盤、２は受光素子、３は発光素
子、６はローパスフイルタ、７はハイパスフイル
タである。
FIG. 1 is a diagram showing the configuration of a conventional record disk inter-track detection device, FIG. 2 is a diagram showing the configuration of the record disk inter-track detection device of the present invention, and FIG. 3 is an explanatory diagram of the same. be. 1 is a record disc, 2 is a light receiving element, 3 is a light emitting element, 6 is a low pass filter, and 7 is a high pass filter.
Claims (1)
３を配置し、上記発光素子２の光を上記レコード
盤１に照射し、当該レコード盤１からの反射光を
上記受光素子３によつて受光し、当該受光出力を
ローパスフイルタ６、ハイパスフイルタ７にそれ
ぞれ入力し、当該両フイルタ６，７の出力を比較
回路５によつて比較し、当該比較出力を曲間部検
出信号とすることを特徴とするレコード盤の曲間
部検出装置。 A light-emitting element 2 and a light-receiving element 3 are arranged opposite to the record 1, the light from the light-emitting element 2 is irradiated to the record 1, and the light reflected from the record 1 is received by the light-receiving element 3. The light reception output is inputted to a low pass filter 6 and a high pass filter 7, respectively, and the outputs of both filters 6 and 7 are compared by a comparison circuit 5, and the comparison output is used as an inter-track detection signal. A device for detecting the inter-track portion of a record disc.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13390481U JPS5839773U (en) | 1981-09-08 | 1981-09-08 | Record disc track interval detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13390481U JPS5839773U (en) | 1981-09-08 | 1981-09-08 | Record disc track interval detection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5839773U JPS5839773U (en) | 1983-03-15 |
| JPH0433600Y2 true JPH0433600Y2 (en) | 1992-08-11 |
Family
ID=29927348
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13390481U Granted JPS5839773U (en) | 1981-09-08 | 1981-09-08 | Record disc track interval detection device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5839773U (en) |
-
1981
- 1981-09-08 JP JP13390481U patent/JPS5839773U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5839773U (en) | 1983-03-15 |
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