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WO1990013119A1 - Recorder with tape sensors for transient processes - Google Patents

Recorder with tape sensors for transient processes Download PDF

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Publication number
WO1990013119A1
WO1990013119A1 PCT/EP1990/000577 EP9000577W WO9013119A1 WO 1990013119 A1 WO1990013119 A1 WO 1990013119A1 EP 9000577 W EP9000577 W EP 9000577W WO 9013119 A1 WO9013119 A1 WO 9013119A1
Authority
WO
WIPO (PCT)
Prior art keywords
recorder according
time
recorder
sensor
tape
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.)
Ceased
Application number
PCT/EP1990/000577
Other languages
German (de)
French (fr)
Inventor
Jürgen Kaaden
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.)
Deutsche Thomson Brandt GmbH
Original Assignee
Deutsche Thomson Brandt GmbH
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 Deutsche Thomson Brandt GmbH filed Critical Deutsche Thomson Brandt GmbH
Priority to KR1019910701373A priority Critical patent/KR920701963A/en
Publication of WO1990013119A1 publication Critical patent/WO1990013119A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
    • G11B15/02—Control of operating function, e.g. switching from recording to reproducing
    • G11B15/05—Control of operating function, e.g. switching from recording to reproducing by sensing features present on or derived from record carrier or container
    • G11B15/06—Control of operating function, e.g. switching from recording to reproducing by sensing features present on or derived from record carrier or container by sensing auxiliary features on record carriers or containers, e.g. to stop machine near the end of a tape
    • G11B15/08—Control of operating function, e.g. switching from recording to reproducing by sensing features present on or derived from record carrier or container by sensing auxiliary features on record carriers or containers, e.g. to stop machine near the end of a tape by photoelectric sensing
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
    • G11B15/02—Control of operating function, e.g. switching from recording to reproducing
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
    • E06B1/00—Border constructions of openings in walls, floors, or ceilings; Frames to be rigidly mounted in such openings
    • E06B1/70—Sills; Thresholds
    • E06B1/702—Window sills
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
    • E06B3/00—Window sashes, door leaves, or like elements for closing wall or like openings; Layout of fixed or moving closures, e.g. windows in wall or like openings; Features of rigidly-mounted outer frames relating to the mounting of wing frames
    • E06B3/32—Arrangements of wings characterised by the manner of movement; Arrangements of movable wings in openings; Features of wings or frames relating solely to the manner of movement of the wing
    • E06B3/34—Arrangements of wings characterised by the manner of movement; Arrangements of movable wings in openings; Features of wings or frames relating solely to the manner of movement of the wing with only one kind of movement
    • E06B3/42—Sliding wings; Details of frames with respect to guiding
    • E06B3/46—Horizontally-sliding wings
    • E06B3/4609—Horizontally-sliding wings for windows
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
    • E06B3/00—Window sashes, door leaves, or like elements for closing wall or like openings; Layout of fixed or moving closures, e.g. windows in wall or like openings; Features of rigidly-mounted outer frames relating to the mounting of wing frames
    • E06B3/96—Corner joints or edge joints for windows, doors, or the like frames or wings
    • E06B3/99—Corner joints or edge joints for windows, doors, or the like frames or wings for continuous frame members crossing each other with out interruption

Definitions

  • the invention is based on a recorder according to the preamble of claim 1.
  • recorders are known as VHS video recorders and as DAT audio recorders.
  • a tape stop, switch-off or rewinding each require a sensor, a control circuit operating the sensor and an evaluation circuit controlled by the sensor to generate the corresponding switching operation.
  • a sensor generally consists of a light-emitting diode emitting a light beam onto the magnetic tape and a phototransistor serving as a receiver, which receives the light beam reflected from the tape or transmitted through a transparent tape section. In principle, separate sensors with the corresponding control and evaluation circuits are required to determine the different states.
  • the object of the invention is to reduce the overall expenditure for the sensors and the associated control and evaluation circuits and to improve the utilization of the individual components.
  • a time window is thus created for the determination or checking of one of the states, such as the beginning of the band, the end of the band, the break in the band, and the like, within which the control circuit for the receiver of the sensor, thus the receiver of the sensor and the evaluation circuit for the output signal of the receiver are also activated. There is a pause between these active times. This is dimensioned by a corresponding duty cycle of the activation time so that the entire device can be used for the determination of another state in a time-division multiplex during this pause.
  • the invention is based on the knowledge that the monitoring of a condition does not have to take place continuously. Rather, it is sufficient if each B. condition is only determined or checked periodically. With a tape speed of 8 mm / s, it is sufficient, for example, if each tape condition is queried approximately 250 times per second, that is, the period of the time-division multiplex interrogation is 4 ms.
  • the invention essentially has the following advantages: The total expenditure on circuit means is reduced since the individual components such as the processor, the control circuits, the sensors and the evaluation circuits are provided only once in the simplest case due to the time-division multiplex operation have to be. The fact that the entire device is only actively controlled for a short time for the determination of a state reduces wear.
  • a further advantage is that, for example, with a duty cycle of 25% of the current flowing into the transmitter during the active time, the same average power loss can be four times as large as the nominal current in continuous operation. This increased nominal current enables an increased signal / noise ratio to be achieved and the service life of the sensor to be increased.
  • the pauses between the individual active times of the sensors achieve an optimal decoupling in time between the individual queries and thus prevent these queries from influencing one another.
  • the invention is particularly applicable to recorders based on the VHS, DAT and Video 2000 systems. -3-
  • Fig. 1 the solution according to the invention in principle
  • Fig. 3 shows a circuit for the control and evaluation of the sensors.
  • a sensor S with a light-emitting diode L and a photo transistor F is assigned to a magnetic tape 1, which has a transparent tape part 2 for triggering an end cut-off at the beginning or end of the tape.
  • the microprocessor 3 supplies control pulses AI, A2 to the light-emitting diode L of the sensor S, namely in time-division multiplex during a period P for two different states.
  • a plurality of control signals for a plurality of states or functions are supplied to the sensor S sequentially in time during the period P. There is a pause between the pulses AI, A2 for the time decoupling between the individual queries.
  • the phototransistor F serving as the receiver accordingly delivers pulses AI, A2 in time division multiplex, which arrive at an input of the processor 3.
  • the processor 3 thus alternately activates the light-emitting diode L of the sensor S serving as a transmitter in time-division multiplex for various states and functions, and thus also the phototransistor F serving as a receiver and accordingly the evaluation circuit contained in the processor 3.
  • FIG. 2 shows the time-sequential operation of the device according to FIG. 1 for two functions.
  • the activation of the sensor S for the query No. 1 begins at the time t1, in that the light-emitting diode L is supplied with a supply voltage and thus sends a light beam via the band 1 to the phototransistor F, for example to query whether this is due to the transparent strip 2 marked tape end is present.
  • the evaluation of the corresponding AI from the phototransistor begins at time t2 -4-
  • the voltages corresponding to time t4 for the second interrogation process are completed.
  • the activation of sensor S by pulse AI begins again.
  • the period P is, for example, 4 ms
  • the duration of the pulses AI is 1 ms
  • the duration of the evaluation of the result t2-t3, t6-t7, t10-tll is 50 ⁇ s.
  • an A / D converter contained in processor 3 is in operation.
  • AI and A2 thus simultaneously mean different addresses for different functions of the recorder, in which the results of the signals delivered by the sensor S are stored.
  • AI and A2 are different addresses in which converter results are stored. The distinction is made according to
  • Wl and W2 represent voltage values that are used to detect the position. If the converter has a full range of 0 - 5 V, a decision at 2.5 V is advantageous. However, since the processor used works with a lower supply voltage for the A / D converter, it is advantageous that the values W1 / W2 are preferably given as percentages, e.g. in the form "less than or equal to 50% of the maxi level".
  • R1 is the common load resistance for the two phototransistors F contained in the sensors SI, S2. Since these only supply a signal sequentially, the two phototransistors F can be connected in parallel and via the common resistor R1 with the operating voltage of +5 Volts connected.
  • R2 is accordingly a common series resistor for the two light-emitting diodes L of the sensors SI, S2.
  • T1, T2 are two switching transistors feeding the light-emitting diodes L.
  • R3, R5 are series resistors for the two transistors T1, T2 and R4, R6 leakage resistors for the first switch-on phase when no current flows.
  • the transistors T1, T2 are driven sequentially in time with the corresponding pauses between the active lines.
  • the phototransistors F deliver corresponding signals to the A / D converter 4, which delivers a digital signal to the processor 3.
  • the capacitor C1 serves to reduce interference peaks in the analog signal supplied by the photo transistors F. If the two sensors SI, S2 do not have to be spatially separated in the recorder because of the monitoring of different functions, they can be replaced by a single sensor S, which is then activated sequentially in the manner described. Since the -6-
  • Processor controls the activation of the sensors SI, S2, it also has the information when the corresponding results from the D / A converter 4 appear at the input. This ensures an absolutely synchronous evaluation of the signals.

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  • Engineering & Computer Science (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Signal Processing Not Specific To The Method Of Recording And Reproducing (AREA)
  • Recording Measured Values (AREA)
  • Recording Or Reproducing By Magnetic Means (AREA)
  • Geophysics And Detection Of Objects (AREA)

Abstract

In a recorder, e.g. VHS or DAT, it is a known process to monitor the start, end, breakage, etc. of the tape by sensors which trigger transients. The purpose of the invention is to simplify the sensors and the assessment circuitry. A sensor (S) is activated for different functions several times in time sequence during a period (P) with intermediate pauses. Especially for a VHS video recorder or a DAT audio recorder.

Description

Recorder mit Bandsensoren für Schaltvorgänge Recorder with band sensors for switching operations

Die Erfindung geht aus von einem Recorder gemäß dem Oberbe¬ griff des Anspruchs 1. Derartige Recorder sind als VHS-Video¬ recorder und als DAT-Audiorecorder bekannt.The invention is based on a recorder according to the preamble of claim 1. Such recorders are known as VHS video recorders and as DAT audio recorders.

Für die Ermittlung der verschiedenen Zustände wie Bandan- fang, Bandende, Bandriß, Unterbrechung der Magnetschicht und dgl. und für den sich daraus ergebenden Schaltvorgang wie z.B. Bandstop, Abschalten oder Rückspulen sind jeweils ein Sensor, eine den Sensor betreibende SteuerSchaltung und eine von dem Sensor gesteuerte Auswertschaltung zur Erzeugung des entsprechenden Schaltvorganges notwendig. Ein Sensor besteht in allgemeinen aus einer einen Lichtstrahl auf das Magnet¬ band aussendenden Leuchtdiode und einem als Empfänger dienen¬ den Fototransistor, der den vom Band reflektierten oder von einem transparenten Bandabschnitt durchgelassenen Licht¬ strahl empfängt. Grundsätzlich sind für die Ermittlung der unterschiedlichen Zustände getrennte Sensoren mit den ent¬ sprechenden Steuer- und Auswertschaltungen erforderlich.For the determination of the various states such as the beginning of the band, the end of the band, the break in the band, interruption of the magnetic layer and the like, and for the resulting switching process such as A tape stop, switch-off or rewinding each require a sensor, a control circuit operating the sensor and an evaluation circuit controlled by the sensor to generate the corresponding switching operation. A sensor generally consists of a light-emitting diode emitting a light beam onto the magnetic tape and a phototransistor serving as a receiver, which receives the light beam reflected from the tape or transmitted through a transparent tape section. In principle, separate sensors with the corresponding control and evaluation circuits are required to determine the different states.

Der Erfindung liegt die Aufgabe zugrunde, den Gesamtaufwand für die Sensoren und die zugehörigen Steuer- und Auswert¬ schaltungen zu verringern und die Ausnutzung der einzelnen Bauteile zu verbessern.The object of the invention is to reduce the overall expenditure for the sensors and the associated control and evaluation circuits and to improve the utilization of the individual components.

Diese Aufgabe wird durch die im Anspruch 1 angegebenen Erfin¬ dung gelöst. Vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüche angegeben.This object is achieved by the invention specified in claim 1. Advantageous developments of the invention are specified in the subclaims.

Bei der Erfindung wird also jeweils für die Ermittlung oder Überprüfung einer der Zustände wie Bandanfang, Bandende, Bandriß und dgl. ein Zeitfenster geschaffen, innerhalb des¬ sen die Steuerschaltung für den Empfänger des Sensors, damit auch der Empfänger des Sensors und die AuswertSchaltung für das Ausgangssignal des Empfängers aktiviert sind. Zwischen diesen aktiven Zeiten liegt eine Pause. Diese ist durch ein entsprechendes Tastverhältnis der Aktivierungszeit so bemes¬ sen, daß während dieser Pause die gesamte Einrichtung für die Ermittlung eines anderen Zustandes in einem Zeitmulti- plex ausgenutzt werden kann. Die Erfindung beruht dabei auf der Erkenntnis, daß die Überwachung eines Zustandes nicht ständig erfolgen muß. Vielmehr reicht es aus, wenn jeder B.andzustand für sich nur periodisch ermittelt oder überprüft wird. Bei einer Bandgescήwindigkeit von 8 mm/s reicht es z.B., wenn jeder Bandzustand etwa 250 mal in der Sekunde ab¬ gefragt wird, die Periodendauer der Zeitmultiplex-Abfrage also 4 ms beträgt.In the case of the invention, a time window is thus created for the determination or checking of one of the states, such as the beginning of the band, the end of the band, the break in the band, and the like, within which the control circuit for the receiver of the sensor, thus the receiver of the sensor and the evaluation circuit for the output signal of the receiver are also activated. There is a pause between these active times. This is dimensioned by a corresponding duty cycle of the activation time so that the entire device can be used for the determination of another state in a time-division multiplex during this pause. The invention is based on the knowledge that the monitoring of a condition does not have to take place continuously. Rather, it is sufficient if each B. condition is only determined or checked periodically. With a tape speed of 8 mm / s, it is sufficient, for example, if each tape condition is queried approximately 250 times per second, that is, the period of the time-division multiplex interrogation is 4 ms.

Durch die Erfindung ergeben sich im wesentlichen folgende Vorteile: Der Gesamtaufwand an Schaltungsmitteln wird verrin¬ gert, da die einzelnen Bauteile wie der Prozessor, die Steu¬ erschaltungen, die Sensoren und die Auswertschaltungen auf¬ grund des Zeitmultiplexbetriebes im einfachsten Fall nur ein¬ mal vorgesehei sein müssen. Dadurch, daß für die Ermittlung eines Zustandes die gesamte Einrichtung nur kurzzeitig aktiv gesteuert ist, wird die Abnutzung verringert. Ein weiterer Vorteil dabei besteht darin, daß z.B. bei einem Tastverhält¬ nis von 25% der während der aktiven Zeit in den Sender hin¬ einfließende Strom bei gleicher mittlerer Verlustleistung vier mal so groß sein kann wie der Nennstrom bei Dauerbe¬ trieb. Durch diesen erhöhten Nennstrom kann ein erhöhtes Si¬ gnal/Rauschverhältnis erreicht und die Lebensdauer des Sen¬ sor erhöht werden. Durch die Pausen zwischen den einzelnen aktiven Zeiten der Sensoren wird eine optimale zeitliche Entkopplung zwischen den einzelnen Abfragen erreicht und so¬ mit eine gegenseitige Beeinflussung dieser Abfragen ausge¬ schlossen. Die Erfindung ist insbesondere anwendbar bei Re¬ cordern nach dem Systemen VHS, DAT und Video 2000. -3-The invention essentially has the following advantages: The total expenditure on circuit means is reduced since the individual components such as the processor, the control circuits, the sensors and the evaluation circuits are provided only once in the simplest case due to the time-division multiplex operation have to be. The fact that the entire device is only actively controlled for a short time for the determination of a state reduces wear. A further advantage is that, for example, with a duty cycle of 25% of the current flowing into the transmitter during the active time, the same average power loss can be four times as large as the nominal current in continuous operation. This increased nominal current enables an increased signal / noise ratio to be achieved and the service life of the sensor to be increased. The pauses between the individual active times of the sensors achieve an optimal decoupling in time between the individual queries and thus prevent these queries from influencing one another. The invention is particularly applicable to recorders based on the VHS, DAT and Video 2000 systems. -3-

Die Erfindung wird anhand der Zeichnung näher erläutert. Dar¬ in zeigenThe invention is explained in more detail with reference to the drawing. Show in it

Fig. 1 die erfindungsgemäße Lösung im Prinzip, Fig. Kurven zur Erläuterung der Fig. 1 und Fig. 3 eine Schaltung für die Steuerung und Auswertung der Sensoren.Fig. 1 the solution according to the invention in principle, Fig. Curves to explain the Fig. 1 and Fig. 3 shows a circuit for the control and evaluation of the sensors.

In Fig. 1 ist einem Magnetband 1, das für die Auslösung ei¬ ner EndabSchaltung am Bandanfang oder am Bandende einen transparenten Bandteil 2 aufweist, ein Sensor S mit einer Leuchtdiode L und einem Fototransistor F zugeordnet. Der Mi¬ kroprozessor 3 liefert Steuerimpulse AI, A2 an die Leuchtdi¬ ode L des Sensors S, und zwar im Zeitmultiplex während einer Periode P für zwei verschiedene Zustände. In der Praxis wer¬ den während der Periode P mehrere Steuersignale für mehrere Zustände oder Funktionen zeitsequentiell dem Sensor S zuge¬ führt. Zwischen den Impulsen AI, A2 liegt jeweils eine Pause für die zeitliche Entkopplung zwischen den einzelnen Abfra¬ gen. Der als Empfänger dienende Fototransistor F liefert ent¬ sprechend Impulse AI, A2 im Zeitmultiplex, die auf einen Ein¬ gang des Prozessors 3 gelangen. Der Prozessor 3 aktiviert also im Zeitmultiplex abwechselnd für verschiedene Zustände und Funktionen die als Sender dienende Leuchtdiode L des Sen¬ sors S, damit auch den als Empfänger dienenden Fototransi¬ stor F und entsprechend die im Prozessor 3 enthaltene Aus¬ wertschaltung.1, a sensor S with a light-emitting diode L and a photo transistor F is assigned to a magnetic tape 1, which has a transparent tape part 2 for triggering an end cut-off at the beginning or end of the tape. The microprocessor 3 supplies control pulses AI, A2 to the light-emitting diode L of the sensor S, namely in time-division multiplex during a period P for two different states. In practice, a plurality of control signals for a plurality of states or functions are supplied to the sensor S sequentially in time during the period P. There is a pause between the pulses AI, A2 for the time decoupling between the individual queries. The phototransistor F serving as the receiver accordingly delivers pulses AI, A2 in time division multiplex, which arrive at an input of the processor 3. The processor 3 thus alternately activates the light-emitting diode L of the sensor S serving as a transmitter in time-division multiplex for various states and functions, and thus also the phototransistor F serving as a receiver and accordingly the evaluation circuit contained in the processor 3.

Fig. 2 zeigt den zeitsequentiellen Betrieb der Einrichtung nach Fig. 1 für zwei Funktionen. Im Zeitpunkt tl beginnt die Aktivierung des Sensors S für die Abfrage Nr. 1, indem die Leuchtdiode L mit einer Speisespannung versorgt wird und so¬ mit einen Lichtstrahl über das Band 1 zum Fototransistor F sendet, z.B. zur Abfrage, ob das durch den durchsichtigen Streifen 2 markierte Bandende vorliegt. Im Zeitpunkt t2 be¬ ginnt die Auswertung des entsprechend AI vom Fototransistor -4-FIG. 2 shows the time-sequential operation of the device according to FIG. 1 for two functions. The activation of the sensor S for the query No. 1 begins at the time t1, in that the light-emitting diode L is supplied with a supply voltage and thus sends a light beam via the band 1 to the phototransistor F, for example to query whether this is due to the transparent strip 2 marked tape end is present. The evaluation of the corresponding AI from the phototransistor begins at time t2 -4-

F an den Prozessor 3 gelieferten Signals. Im Zeitpunkt t3 ist die Auswertung dieses Signals abgeschlossen. Durch Zeit¬ konstanten, Signalverzögerungen und dgl. hat die gesamte Schaltung im Zeitpunkt t4 wieder den Ruhezustand erreicht, in dem alle Signale wieder auf den Ruhewert eingeschwungen sind. Von t4 - t5 folgt eine Pause, die als Sicherheitspause zur zeitlichen Entkopplung der einzelnen Abfragevorgänge dient. Im Zeitpunkt t5 beginnt 'für einen zweiten Abfragevor¬ gang entsprechend die Aktivierung des Sensors S mit dem Im¬ puls A2, der den Sensor S in derselben Weise zugeführt wird. Im Zeitpunkt t6 beginnt entsprechend die Auswertung des Er¬ gebnisses des zweiten Abfragevorganges im Prozessor 3, der dann im Zeitpunkt t7 abgeschlossen ist. Bei t8 sind die Span¬ nungen entsprechend dem Zeitpunkt t4 für den zweiten Abfrage¬ vorgang abgeschlossen. Nach der zur Entkopplung dienenden Sicherheitszeit von t8 - t9 beginnt wieder die Aktivierung des Sensors S durch den Impuls AI. Darauf folgen wieder die Auswertung Von tlO - tll durch den Impuls AI. Die Perioden¬ dauer P beträgt z.B. 4 ms, die Dauer der Impulse AI, A2 1 ms und die Dauer der Auswertung des Ergebnisses t2 - t3, t6 - t7, tlO - tll 50 μs. Während dieser Zeit von 50 μs ist also ein im Prozessor 3 enthaltender A/D-Wandler im Betrieb. AI und A2 bedeuten somit gleichzeitig verschiedene Adressen für verschiedene Funktionen des Recorders, in denen die Er¬ gebnisse der vom Sensor S gelieferte Signale abgelegt werden.F signal supplied to processor 3. The evaluation of this signal is completed at time t3. Due to time constants, signal delays and the like, the entire circuit has returned to the idle state at time t4, in which all signals have settled back to the idle value. There is a pause from t4 - t5, which serves as a safety pause for the time decoupling of the individual query processes. At time t5 'begins for a second Abfragevor¬ gear according to the activation of the sensor S with the Im¬ pulse A2, which is the sensor S is fed in the same manner. Accordingly, the evaluation of the result of the second query process in processor 3 begins at time t6, which is then completed at time t7. At t8, the voltages corresponding to time t4 for the second interrogation process are completed. After the decoupling safety time of t8 - t9, the activation of sensor S by pulse AI begins again. This is followed by the evaluation of tlO - tll by the impulse AI. The period P is, for example, 4 ms, the duration of the pulses AI, A2 is 1 ms and the duration of the evaluation of the result t2-t3, t6-t7, t10-tll is 50 μs. During this time of 50 μs, an A / D converter contained in processor 3 is in operation. AI and A2 thus simultaneously mean different addresses for different functions of the recorder, in which the results of the signals delivered by the sensor S are stored.

AI und A2 sind verschiedene Adressen, in denen Wandlerergeb¬ nisse abgelegt werden. Die Unterscheidung erfolgt nachAI and A2 are different addresses in which converter results are stored. The distinction is made according to

W1/W2 größer als 2,5 V = Bandmitte Wl kleiner als 2,5 V = Bandende W2 keiner als 2,5 V = Bandanfang W1 W2 kleiner als 2,5 V = Fehler-Fremdlicht, Kassette ohne Band oder ähnliches. -5-W1 / W2 greater than 2.5 V = tape center Wl less than 2.5 V = tape end W2 none than 2.5 V = tape start W1 W2 less than 2.5 V = fault external light, cassette without tape or similar. -5-

Wl und W2 stellen Spannungswerte dar, die zur Erkennung der Position Verwendung finden. Bei vollem Bereich des Wandlers von 0 - 5 V ist eine Entscheidung bei 2,5 V vorteilhaft. Da der verwendete Prozessor aber mit einer geringeren Versor- gungsspannung für den A/D-Wandler arbeitet, ist es vorteil¬ haft, daß die Werte W1/W2 vorzugsweise als Prozentangaben erfolgen, z.B. in der Form "kleiner gleich 50% des Maxi alpe- gels" .Wl and W2 represent voltage values that are used to detect the position. If the converter has a full range of 0 - 5 V, a decision at 2.5 V is advantageous. However, since the processor used works with a lower supply voltage for the A / D converter, it is advantageous that the values W1 / W2 are preferably given as percentages, e.g. in the form "less than or equal to 50% of the maxi level".

Fig. 3 zeigt eine Schaltung zur Steuerung und Auswertung von zwei Sensoren SI, S2. Zwei Sensoren können z.B. notwendig sein, weil die Auswertung von zwei Zuständen wie Bandanfang und Bandende räumlich .an verschiedenen Stellen einer Kasset¬ te erfolgen müssen. Rl ist der gemeinsame Arbeitswiderstand für die beiden in den Sensoren SI, S2 enthaltenden Fototran¬ sistoren F. Da diese nur sequentiell ein Signal liefern, kön¬ nen die beiden Fototransistoren F parallel geschaltet und über den gemeinsamen Widerstand Rl mit der Betriebs Spannung von +5 Volt verbunden sein. R2 ist entsprechend ein gemeinsa¬ mer Vorwiderstand für die beiden Leuchtdioden L der Sensoren SI, S2. Tl, T2 sind zwei die Leuchtdioden L speisende Schalt¬ transistoren. R3, R5 sind Vorwiderstände für die beiden Tran¬ sistoren Tl, T2 und R4, R6 Ableitwiderstände für die erste Einschaltphase, wenn kein Strom fließt. Die Transistoren Tl, T2 werden in der beschriebenen Weise zeitlich nacheinander sequentiell mit den entsprechenden Pausen zwischen den akti¬ ven Zeilen angesteuert. Die Fototransistoren F liefern ent¬ sprechende Signale an den A/D-Wandler 4, der ein digitales Signal an den Prozessor 3 liefert. Der Kondensator Cl dient zur Reduzierung von Störspitzen in dem von den Fototransisto¬ ren F gelieferten analogen Signal. Wenn die beiden Sensoren SI, S2 wegen der Überwachung unterschiedlicher Funktionen, im Recorder nicht räumlich getrennt liegen müssen, können sie durch einen einzigen Sensor S ersetzt sein, der dann in der beschriebenen Weise zeitsequentiell aktiviert wird. Da der -6-3 shows a circuit for controlling and evaluating two sensors SI, S2. Two sensors may be necessary, for example, because the evaluation of two states, such as the start and end of the tape, must take place spatially at different points on a cassette. R1 is the common load resistance for the two phototransistors F contained in the sensors SI, S2. Since these only supply a signal sequentially, the two phototransistors F can be connected in parallel and via the common resistor R1 with the operating voltage of +5 Volts connected. R2 is accordingly a common series resistor for the two light-emitting diodes L of the sensors SI, S2. T1, T2 are two switching transistors feeding the light-emitting diodes L. R3, R5 are series resistors for the two transistors T1, T2 and R4, R6 leakage resistors for the first switch-on phase when no current flows. In the manner described, the transistors T1, T2 are driven sequentially in time with the corresponding pauses between the active lines. The phototransistors F deliver corresponding signals to the A / D converter 4, which delivers a digital signal to the processor 3. The capacitor C1 serves to reduce interference peaks in the analog signal supplied by the photo transistors F. If the two sensors SI, S2 do not have to be spatially separated in the recorder because of the monitoring of different functions, they can be replaced by a single sensor S, which is then activated sequentially in the manner described. Since the -6-

Prozessor die Aktivierung der Sensoren SI, S2 steuert, hat er auch die Information, wann die entsprechenden Ergebnisse vom D/Ä-Wandler 4 am Eingang erscheinen. Dadurch ist eine absolut zeitlich übereinstimmende und synchrone Auswertung der Signale sichergestellt.Processor controls the activation of the sensors SI, S2, it also has the information when the corresponding results from the D / A converter 4 appear at the input. This ensures an absolutely synchronous evaluation of the signals.

Bei einer praktisch erprobten Schaltung gemäß Fig. 3 lagen folgende Werte vor:The following values were present in a circuit which had been tested in practice in accordance with FIG. 3:

Steuerstrom für die Transistoren Tl, T2: 1 mA R4 und R6: 22 kOhmControl current for the transistors Tl, T2: 1 mA R4 and R6: 22 kOhm

Kollektorstrom für Tl, T2 60 mACollector current for Tl, T2 60 mA

Tl, T2: Typ BC548 B R2: 68 OhmTl, T2: Type BC548 B R2: 68 ohms

Rl: 47 kOhmRl: 47 kOhm

Cl: 47 pFCl: 47 pF

Prozessor 3: Typ MB 89713 Processor 3: type MB 89713

Claims

P a t e n t a n s p r ü c h e Patent claims 1. Recorder mit Bandsensoren für Schaltvorgänge zur Ermitt¬ lung von Zuständen wie Bandanfang, Bandende, Bandriß, wobei ein Sensor (S) einen von einer Steuerschaltung (3) aktivierten Sender (L) und einen an eine Auswert¬ schaltung (3) angeschlossenen Empfänger (F) enthält, dadurch gekennzeichnet, daß der Sensor (SI, S2) und die Steuer- und Auswertschaltung (3) für die Ermittlung ver¬ schiedener Zustände während einer Periodendauer (P) mehrfach zeitse uentiell mit dazwischen liegenden Pau¬ sen (t3 - t5) jeweils während einer Zeit (tl - t3) akti¬ viert werden, die kleiner ist als die halbe Periodendau¬ er (P).1. Recorder with tape sensors for switching processes for determining states such as the beginning, end of tape, and tape break, a sensor (S) being a transmitter (L) activated by a control circuit (3) and a receiver connected to an evaluation circuit (3) (F), characterized in that the sensor (SI, S2) and the control and evaluation circuit (3) for the determination of different states during a period (P) several times in sequence with pauses (t3 - t5) are each activated during a time (tl - t3) that is less than half the period (P). 2. Recorder nach Anspruch 1, dadurch gekennzeichnet, daß für alle Sensoren (S) und/oder Zustände dieselbe Steu¬ er- und Auswertschaltung (3) vorgesehen ist.2. Recorder according to claim 1, characterized in that the same control and evaluation circuit (3) is provided for all sensors (S) and / or states. 3. Recorder nach Anspruch 2, dadurch gekennzeichnet, die Steuerschaltung und die AuswertSchaltung in einem Mikro¬ prozessor (3) enthalten sind.3. Recorder according to claim 2, characterized in that the control circuit and the evaluation circuit are contained in a microprocessor (3). 4. Recorder nach Anspruch 3, dadurch gekennzeichnet, daß zwischen dem Ausgang des Empfängers (F) des Sensors (S) und dem Eingang des Prozessors (3) ein A/D-Wandler (4) liegt.4. Recorder according to claim 3, characterized in that between the output of the receiver (F) of the sensor (S) and the input of the processor (3) is an A / D converter (4). 5. Recorder nach Anspruch 1, dadurch gekennzeichnet, daß die aktive Zeit (tl-t3) etwa 25% der Periodendauer (P) beträgt.5. Recorder according to claim 1, characterized in that the active time (tl-t3) is approximately 25% of the period (P). 6. Recorder nach Anspruch 1, dadurch gekennzeichnet, die Pausen so lang bemessen sind, daß bei erneuter Aktivie¬ rung die vorangehende Aktivierung und Auswertung unter Berücksichtigung von Laufzeiten, Zeitkonstanten und Aus¬ schwingvorgängen abgeschlossen sind.6. Recorder according to claim 1, characterized in that the pauses are dimensioned so long that the previous activation and evaluation are completed taking into account running times, time constants and swing-out processes when reactivated. 7. Recorder nach Anspruch 1, dadurch gekennzeichnet, daß die Auswertschaltung für einen Empfänger (F) nur in der Zeit aktiviert ist, in der der zugehörige Sender einge¬ schaltet ist.7. Recorder according to claim 1, characterized in that the evaluation circuit for a receiver (F) is activated only in the time in which the associated transmitter is switched on. 8. Recorder nach Anspruch 1, dadurch gekennzeichnet, daß die Ausgänge mehrerer Empfänger (F) parallel geschaltet und an den Eingang der Auswertschaltung (3) angeschlos¬ sen sind.8. Recorder according to claim 1, characterized in that the outputs of a plurality of receivers (F) are connected in parallel and are connected to the input of the evaluation circuit (3). 9. Recorder nach Anspruch 1, dadurch gekennzeichnet, daß der einem Sender (L) bei der Aktivierung zugeführte Steuerstrom gegenüber dem Nennwert bei Dauerbetrieb um das Verhältnis aus der Periodendauer (P) zu der aktiven Zeit (tl - t3) erhöht ist. 9. Recorder according to claim 1, characterized in that the control current supplied to a transmitter (L) during activation is increased compared to the nominal value in continuous operation by the ratio of the period (P) to the active time (tl - t3).
PCT/EP1990/000577 1989-04-20 1990-04-11 Recorder with tape sensors for transient processes Ceased WO1990013119A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019910701373A KR920701963A (en) 1989-04-20 1990-04-11 Recorder with tape sensor for switching process

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3912999A DE3912999A1 (en) 1989-04-20 1989-04-20 RECORDER WITH TAPE SENSORS FOR SWITCHING
DEP3912999.3 1989-04-20

Publications (1)

Publication Number Publication Date
WO1990013119A1 true WO1990013119A1 (en) 1990-11-01

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Country Status (10)

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EP (1) EP0469012A1 (en)
JP (1) JPH04504777A (en)
KR (1) KR920701963A (en)
CN (1) CN1055832A (en)
AU (1) AU5425390A (en)
DD (1) DD293905A5 (en)
DE (1) DE3912999A1 (en)
MY (1) MY105585A (en)
TR (1) TR24492A (en)
WO (1) WO1990013119A1 (en)

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DE4122985A1 (en) * 1991-07-11 1993-01-14 Klaus Zeiske Tape player remote control device e.g. for tour commentary - uses control signal transmitter to provide signals from several receivers each associated with respective tape player
US6251936B1 (en) 1998-05-12 2001-06-26 American Home Products Corporation Benzothiophenes, benzofurans, and indoles useful in the treatment of insulin resistance and hyperglycemia

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GB2136626A (en) * 1983-03-16 1984-09-19 Philips Nv Optical end-of-tape detection device
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EP0157201A1 (en) * 1984-03-09 1985-10-09 Sanyo Electric Co., Ltd. Tape end detecting device
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EP0157201A1 (en) * 1984-03-09 1985-10-09 Sanyo Electric Co., Ltd. Tape end detecting device
EP0210367A2 (en) * 1985-07-24 1987-02-04 GRUNDIG E.M.V. Elektro-Mechanische Versuchsanstalt Max Grundig holländ. Stiftung & Co. KG. Device for controlling optocouplers by pulses
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EP0718835A1 (en) * 1994-12-21 1996-06-26 Lg Electronics Inc. Tape position and reel rotation detection method for video cassette tape recorder
US5657178A (en) * 1994-12-21 1997-08-12 Lg Electronics Inc. Tape position and reel rotation detection method for video cassette tape recorder

Also Published As

Publication number Publication date
DD293905A5 (en) 1991-09-12
DE3912999A1 (en) 1990-10-25
JPH04504777A (en) 1992-08-20
EP0469012A1 (en) 1992-02-05
MY105585A (en) 1994-10-31
CN1055832A (en) 1991-10-30
TR24492A (en) 1991-11-01
AU5425390A (en) 1990-11-16
KR920701963A (en) 1992-08-12

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