JPH0383246A - Cassette tape recording/reproducing equipment - Google Patents

Abstract

PURPOSE:To eliminate the need for resetting a switch at the time of recording or reproducing by making automatically an operation means active or inactive under its individual mode for the operation means based on a detected color of a prescribed zone of a cassette half. CONSTITUTION:When a cassette tape of a cassette half 17 having the prescribed zone in red is loaded, red light is reflected from the prescribed zone of the cassette half 17, and an output of a photodiode 13 is large while an output of the same 14 is small. Consequently, outputs 90 and 92 of a color deciding circuit 15 become low in level to be given to a chip 16, and 'Dolby(R)' C is operated. When a cassette half 17 having its prescribed zone in green is loaded, the output of the diode 13 is small while the output of the same 14 is large. Consequently, the outputs of the circuit 15 become low in level, and the 'Dolby(R)' is turned off. When a cassette half 17 having its prescribed zone in black for instance is loaded, the outputs of the diodes 13 and 14 are zero, and the output 92 of the circuit 15 becomes high in level while the output 90 becomes low in level, and hence the 'Dolby(R)' B is operated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to cassette tape recording/playback equipment such as playback-only or recording and playback cassette tape decks and video decks.

In particular, the present invention relates to a cassette tape recording/playback device equipped with operating means such as a noise reduction system that is activated or deactivated during recording or playback of a cassette tape.

[Prior Art] Cassette tape recording and playback equipment, for example, cassette tape decks for recording and playback, are equipped with operating means such as a noise reduction system that is activated or deactivated when recording or playing back a cassette tape. There is.

Noise reduction systems include, for example, Dolby B
type, Dolby C type, dbX, etc. (Dolby is a registered trademark of Dolby Laboratories, Inc., and dbx is a registered trademark of DBX, Inc.)
.

There are three operating modes in cassette tape decks equipped with Dolby B type and Dolby C type noise reduction systems. The first case is when neither Dolby B nor C type noise reduction system is activated. The second case is when only the Dolby B type noise reduction system is activated. The third case is when only the Dolby C type noise reduction system is activated.

In order to select one of these three modes, the operator operates a Dolby on/off switch during recording and also operates a Dolby B-C selection switch. Depending on the mode of operation of this switch,
The noise reduction system can be activated or deactivated. The operator also writes on a label attached to the cassette half whether or not noise reduction was used during recording, and if so, which type was used.

In addition, when playing back a cassette tape, the operator should check the label display to determine whether Dolby is being used and its type (B or C).
) was confirmed. Then, in accordance with this display content, the operator operates the Dolby on/off switch and also operates the Dolby B/C selection switch.

Depending on the manner of operation of this switch, the noise reduction system is activated or deactivated.

Similarly, when there is only one noise reduction system, or when activating or disabling the bias circuit as an operating means used when using a bi-position tape, the operator operates the switch. However, the operating means is activated or deactivated depending on the manner in which the switch is operated.

[Problem to be solved by the invention] However, in the past, when recording or playing back, it was necessary to operate the switch each time according to the individual mode of activation or deactivation of the operating means, so it was difficult to operate the switch. It was cumbersome to operate, and sometimes resulted in erroneous operations.

Furthermore, it is necessary to write on the label whether the operating means is activated or deactivated at the time of recording, which is complicated. In addition, when playing back a cassette tape, it is troublesome to have to check the information written on the label each time the cassette tape is replaced.

The present invention solves the above-mentioned technical problems, and eliminates the need to reset switches for selecting individual modes of activation or deactivation of operating means when recording or playing back a cassette tape. To provide a cassette tape recording/playback device that does not require any inscription on the label or review the written contents.

[Means for Solving the Problems] In order to solve the above-mentioned technical problems, the present invention has the following configuration. That is, the cassette tape recording/playback device according to claim (1) is provided with a single or plural operating means that is activated or deactivated when recording or playing back a cassette tape housed in a cassette half. Detecting the color of a predetermined region of the cassette half, which corresponds in advance to the individual manner of activation or deactivation of the operating means, and automatically activating or deactivating the operating means in an individual manner on the basis of the detected color. It includes control means for immobilizing the vehicle.

The cassette tape recording/playback device according to claim <2) is characterized in that the control means according to claim (1) individually activates or deactivates the operating means based on the color of a predetermined area of the cassette half itself. in a predetermined area of the cassette half in a color matching the particular manner of activating or disabling the operating means, if the mode differs from the desired individual mode of activating or disabling the operating means. a label to be affixed; and a color identification means for detecting the color of a predetermined area of the cassette half and automatically activating or deactivating the operating means in an individual manner based on the detected color. , is.

The cassette tape recording/playback device according to claim (3) is characterized in that the color identification means according to claim (2) emits light of a single or multiple predetermined wavelengths and a predetermined brightness in a predetermined region of the cassette half. a light projecting means for projecting light; a light receiving means for receiving the light reflected from a predetermined area and deriving an output according to the amount of received light of a predetermined wavelength; and a cassette half for level-discriminating the output of the light receiving means. and a color determination circuit that detects the color of a predetermined region of the color and automatically activates or deactivates the operating means in an individual manner based on the detected color.

[Function] In the cassette tape recording/playback device of claim (1), the control means detects the color of a predetermined region of the cassette half that corresponds in advance to the individual mode of activation or deactivation of the operating means. and automatically activating or deactivating the operating means in an individual manner based on the detected color.

Therefore, there is no need to reset the switch for selecting individual modes of activation or deactivation of the operating means when recording or playing back a cassette tape, and there is no need to write the same information on the label. There is no need to review the entered information.

In the cassette tape recording/playback device according to claim (2), the control means according to claim (1) includes a label and color identification means.

The label includes at least an individual mode of activation or disabling of the operating means based on the color of a predetermined area of the cassette half itself and a desired individual mode of activation or disabling of the operating means. In different cases, it is applied to predetermined areas of the cassette half in a color that corresponds to the particular mode of activation or deactivation of the operating means.

The color identification means detect the color of a predetermined area of the cassette half and automatically activate or deactivate the operating means in an individual manner based on the detected color.

Therefore, it is furthermore possible to freely choose the individual manner of activation or deactivation of the operating means without being constrained by the color of the predetermined areas of the cassette half itself. Moreover, if the color of the predetermined area of the cassette half itself matches the color of the mode desired by the operator, there is no need to take the trouble to attach a label to the predetermined area of the cassette half, reducing the operator's effort. Reduced.

Note that if the color of the predetermined area of the cassette half itself matches the color of the mode desired by the operator, the operating means may be adjusted based on the color of the cassette half itself without attaching a label depending on the color of the cassette half itself. It is also possible to automatically activate or deactivate individual aspects, but to ensure operation, even in this case it is necessary to label the cassette half with a label that matches the color of the desired aspect. It is desirable to attach it to a predetermined area.

In the cassette tape recording/playback device according to claim (3), the color identification means according to claim (2) comprises a light projecting means;
It includes a light receiving means and a color identification circuit.

The light projecting means projects light of a single or multiple predetermined wavelengths and a predetermined brightness onto a predetermined region of the cassette half.

The light receiving means receives light reflected from a predetermined area and derives an output according to the amount of received light of a predetermined wavelength.

The color discrimination circuit level-discriminates the output of the light receiving means to detect the color of a predetermined region of the cassette half, and automatically activates or deactivates the operating means in an individual manner based on the detected color.

Therefore, in addition, colors can be reliably identified,
Malfunctions can be prevented.

[Example] Hereinafter, the present invention will be described in detail based on the drawings.

FIG. 1 is a simplified diagram of one embodiment of the invention.

In this embodiment, the invention is used for automatic switching of the noise reduction systems 2, 3 of a cassette tape deck 1.

A cassette tape deck 1 for recording and playback as a recording/playback device includes a noise reduction system 2.3 as an operating means, switches 4 to 7, and an indicator ( (not shown) and a control means 8. The control means 8 includes a label 9 and a color identification means 10. The color identification means 10 includes red and green light emitting diodes 1 as light emitting means.
1.12, red and green photodiodes 13.14 as light receiving means, and a color determination circuit 15.

The noise reduction system 2 is, for example, a Dolby C
It is of type. The noise reduction system 3 is, for example, of the Dolby C type. Noise reduction system 2 and noise reduction system 3
It is integrated into a single chip. This chip 1
6 includes control personnel 16a, 16b.

If a high level signal is input to the control input 16a, both noise reduction systems 2.3 are disabled. When a low level signal is input to the control human power 16a, either one of the noise reduction systems 2 and 3 can be activated depending on the level of the signal input to the control human power 16b. When a low level signal is input to the control input 16a and a high level signal is input to the control input 16b,
The noise reduction system 2 is activated.

When a low level signal is input to the control input 16a and a low level signal is input to the control input 16b, the noise reduction system 3 is activated. Therefore, the manner in which the noise reduction systems 2 and 3 are activated and deactivated is as follows: both during recording and during playback.
There are three cases: a case where both are disabled, a case where only the noise reduction system 2 is activated, and a case where only the noise reduction system 3 is activated.

Switch 6.7 is a switch for switching between auto and manual. Connect both switches 6.7 to contact 6b, ? By connecting to the b side (the state shown in the figure), it becomes the auto state. That is, the output 90.92 of the color determination circuit 15 is the control input 16a of the chip 16.

16b, and the operation mode is automatically controlled.

Further, by connecting both switches 6.7 to the contacts 6a and 7a, the manual state is established.

That is, by manually operating switch 4, Dolby is turned on and off, and by manually operating switch 5,
It is possible to switch between Dolby B and Dolby C.

The light emitting diode 11.12 and the photodiode 13.14 of the color identification means 1O are integrated into an epoxy resin mold and mounted near the cassette half mounting device (not shown) of the cassette tape deck 1. Light emitting diode 11. 12 projects light onto a predetermined area of the cassette half 17, for example near the recording prevention tab. The light emitting wavelength of the light emitting diode 11 is, for example, 650 nm, which is red. The light emitting wavelength of the light emitting diode 12 is, for example, green 56
It is 3 nm.

As shown in Figure 2, between DC power supply element B and ground,
A resistor 25 and a forward light emitting diode 11 are connected in series. A resistor 26 and a forward light emitting diode 12 are connected in series between the DC power supply element B and the ground.

Photodiode 13. 14 is the cassette no.
The light reflected from a predetermined region of 7 is received, and an output corresponding to the amount of received light of a predetermined wavelength is derived. The peak sensitivity wavelength of the photodiode 13 is, for example, 920 nm in the infrared region, as shown in FIG. Photodiode 14
The peak sensitivity wavelength of is, for example, 560 nm for green, as shown in FIG.

A resistor 27, a reverse photodiode 13, and a resistor 28 are connected in series between the DC power supply element B and the ground. A noise prevention capacitor 29 is connected in parallel to the resistor 28 . In addition, a resistor 30, a photodiode 14 in the opposite direction, and a resistor 31 are connected between the DC power supply element B and the ground.
are connected in series. A noise prevention capacitor 32 is connected in parallel to the resistor 31 .

Note that the resistance values of the resistors 25 and 26 are adjusted to adjust the photocurrents flowing through the light emitting diodes 11 and 12, so that there is no difference in brightness between the light emitting diodes 11 and 12, and/or the resistance values of the resistors 28 and 31 are adjusted. The resistance value is adjusted so that when the light from the light emitting diode 11.12 is totally reflected, the voltage output from the photodiode 13.14 becomes equal.

In the color determination circuit 15 of the color discrimination means IO, the anode of the photodiode 13 is connected to the non-inverting input of the operational amplifier 33. The output of the operational amplifier 33 is connected to the inverting input of the operational amplifier 33. The anode of photodiode 14 is connected to a non-inverting input of operational amplifier 34 . The output of the operational amplifier 34 is connected to the inverting input of the operational amplifier 34 . Therefore, operational amplifiers 33,34 function as buffers.

The output of operational amplifier 33 is connected to the non-inverting input of operational amplifier 35. The output of operational amplifier 34 is connected to the inverting input of operational amplifier 35 via resistor 36 .

The output of the operational amplifier 35 is connected to the inverting input of the operational amplifier 35 via a resistor 37 . Therefore, operational amplifier 35 functions as a differential amplifier. Operational amplifier 3
3.34.35 is powered by power supplies B, -H.

The output of operational amplifier 35 is connected to a non-inverting input of operational amplifier 38 and an inverting input of operational amplifier 39, respectively. Resistors 41a and 41b are connected in series between power supply element B and ground to create a reference voltage. This reference voltage is determined by the voltage division ratio of the resistors 41a and 41b, for example +
It is 1.5V. This reference voltage is applied to the inverting input of operational amplifier 38. Therefore, the operational amplifier 38 is
Level discrimination is performed using +1.5V as a reference.

Resistors 42a and 42b are connected in series between power supply B and ground to create a reference voltage. This reference voltage is determined by the voltage division ratio of the resistors 42a and 42b, and is, for example, -1,
It is 5V. This reference voltage is applied to the non-inverting input of operational amplifier 39. Therefore, the operational amplifier 38 is -
Level discrimination is performed based on i and sv. Operational amplifier 3
8.39 is powered by power element B. The output of the operational amplifier 38 is pulled up by a resistor 43 and connected to one input of a NOR gate 44 . The output of operational amplifier 39 is pulled up by resistor 45 and connected to the other input of NOR gate 44 .

The operation of the cassette tape holder constructed as described above is as follows. In this embodiment, if the color of the predetermined area of the cassette half 17 is red, Dolby 01 green (including yellow: yellow has a wavelength close to green), Dolby will not be displayed, and if the color is other than that, Dolby 01 will be displayed. If so, it is determined that it is Dolby B.

Further, the explanation will proceed assuming that the switch 6.7 is in an auto state where the switch 6.7 is connected to the 6b and 7b sides.

When a cassette tape whose color is red in a predetermined area of the cassette half 17 is loaded, red light from the predetermined area of the cassette half 17 is reflected, the output of the photodiode 13 is large, and the output of the photodiode 14 is becomes smaller. Therefore, the output of the operational amplifier 35 is the reference voltage +1,
Exceeds 5V. The output of the operational amplifier 38 becomes high level, and the output of the operational amplifier 39, that is, the color determination circuit 15
The output 90 of becomes low level. Also, NOR gate 4
4, that is, the output 92 of the color determination circuit 15 becomes low level.

Since the output 90 is given to the control manpower 16a of the chip 16 and the output 92 is given to the control manpower 16b, Dolby C operates.

When a cassette table with a green color in a predetermined area of the cassette half 17 is mounted, green light from the predetermined area of the cassette half 17 is reflected, the output of the photodiode 13 is small, and the output of the photodiode 14 is small. growing. Therefore, the output of the operational amplifier 35 is the reference voltage −1,
The voltage will be less than 5. Therefore, the output of the operational amplifier 38 becomes a low level, the output of the operational amplifier 39 becomes a high level, and the output of the NOR gate 44 becomes a low level. Therefore, the output 90 of the color determination circuit 15 becomes low level, and Dolby is turned off.

When a cassette tape whose predetermined area of the cassette half 17 is a color other than red or green (including yellow), for example, black, is mounted, there is no reflected light from the predetermined area of the cassette half 17, and the photodiode 13 The output of .14 is equal to O. Therefore, the output of operational amplifier 35 is +1
．． OV between 5V and -1.5V. Therefore, the output of the operational amplifier 38 becomes low level, the output of the operational amplifier 39 also becomes low level, and the output 9 of the NOR gate 44 becomes low level.
2 is a high level. Therefore, the output 90 of the color determination circuit 15 is at a low level, the output 92 is at a high level, and Dolby B is activated.

Note that in the case of a color other than red and green (including yellow), such as white, it is totally reflected from a predetermined area of the cassette half 17, and the outputs of the photodiodes 13 and 14 are high and the same. Therefore, the output of operational amplifier 35 is +1.
OV between 5V and -1.5V.

Therefore, the output of the operational amplifier 38 becomes a low level, the output of the operational amplifier 39 also becomes a low level, and the output of the NOR gate 44 becomes a high level. In this case as well, the output 90 of the color determination circuit 15 is at a low level, the output 92 is at a high level, and Dolby B operates. Also, red, green (including yellow)
Even if the color is other than black or white, the output balance of the photodiodes 13 and 14 will not be significantly disturbed. Therefore, similar to the above, Dolby B operates.

In the above embodiment, the relationship between the operation mode and the color is determined as described above for the following reasons.

When we investigated the color of the cassette half 17 itself, we found that for pre-recorded music tapes sold in certain regions, 1% is red, 5% green (including yellow), red and Colors other than green (including yellow) were 94%.

Table 1 Cassette half color Ratio black 4% gray
19% red
1% green (including yellow) 5% white 30% silver
3% transparent 3
8% Total 100% Also, as shown in Table 2, the usage status of noise reduction systems for recorded music tapes sold in a certain region is 90% for Dolby C type, 0% for Dolby C type, No noise reduction was 10%.

(Margin below this page) Table 2 Noise Reduction Ratio No noise reduction 10% Dolby 8 52% Dolby B WITHHX-PRo 38% total
100% Therefore,
Light emitting diode 11.12, photodiode 13.1
Considering the wavelength of 4, the color of the cassette half 17, and the usage status of the noise reduction system of the recorded music tape, if the color of a predetermined area of the cassette half 17 is red, ), it was set as Dolby Off, and anything other than red and green (including yellow) was set as Dolby B.

In this case, the three modes of Dolby Off, Dolby C1 Green, and Dolby C On, which are performed based on the color of a predetermined area of the cassette half itself, may differ from the operator's wishes. Therefore, in this case, the cassette half 17
It is necessary to change the color of a predetermined area to a color that matches the three modes of Dolby Off, Dolby B On, and Dolby C On.

Therefore, at least in this case, the cassette no.
Dolby Off, Dolby B
Colors that match the three aspects of On and Dolby C On,
For example, red, green, and black labels 9 are prepared.

When recording or reproducing in Dolby B, it is not necessary to attach the label 9 to the cassette half 17 when the color of the cassette half 17 is other than red and green (including yellow). When the color of the cassette half 17 is red or green (including yellow), a black label 9 may be attached to a predetermined area of the cassette half 17. When recording or reproducing in Dolby C, if the color of the cassette half 17 is other than red, a red label 9 may be attached to a predetermined area of the cassette half 17. When recording or playing back with Dolby Off, if the color of the cassette half 17 is other than green or yellow, insert the green label 9 into the cassette/X-frame 1.
What is necessary is to attach it to a predetermined area of 7.

Note that even when the color of the cassette half 17 is red when recording or playing with Dolby C, or when the color of the cassette half 17 is green or yellow when recording or playing with Dolby Off, the cassette half 17 may be red. It is also possible to set Dolby C1 Dolby Off without attaching the green label 9, but in order to ensure operation, even in this case, red and green, which are colors that match the colors of the desired mode, are used. It is desirable to attach the label 9 to a predetermined area of the cassette half 17.

Note that in the above embodiment, the output of the operational amplifier 39 and the NO.
Although the output of the R gate 44 is applied to the control power 16a, 16b of the chip 16 through the switch 6.7, in another embodiment of the present invention, the arithmetic operation can be performed without going through the switch 6.7. The output of amplifier 39 and NO
The output of the R gate 44 may be directly applied to the control power 16a, 16b of the chip 16, respectively.

In other embodiments, a color identification means 10 as shown in FIG. 5 may be used.

In this circuit, only one photodiode 85 for receiving light is used. Its light receiving sensitivity is the same as that shown in FIG. In this embodiment, the output OUT is the highest when the color of the predetermined area is red, and decreases in the order of the edges (including yellow) and black.

The color is determined based on the voltage difference between the outputs OMIT.

Furthermore, in the above-described embodiments, the operation means is described as a noise reduction system, but the present invention can also be implemented in the case of other operation means such as a bias circuit.

Further, although the cassette tape recording/playback device has been described as a cassette tape deck, the present invention can also be implemented in the case of other cassette tape recording/playback devices such as a video tape deck.

Furthermore, as another embodiment of the present invention, the color identification means may be configured using a white light source, a CCD, or a microcomputer. Alternatively, the outputs of the operational amplifiers 38 and 39 may be viewed by a microcomputer to detect the color and activate/deactivate the operating means.

[Effects of the Invention] The cassette tape recording/playback device according to claim (1) detects the color of a predetermined region of the cassette half that corresponds in advance to the individual mode of activation or deactivation of the operating means, Control means are included for automatically activating or deactivating the operating means in an individual manner based on the detected color.

Therefore, there is no need to reset the switch each time to select an individual mode of activation or deactivation of the operating means when recording or playing back a cassette tape, and there is no need to write any information on the label. There is no need to review the entered information.

In the cassette tape recording/playback device according to claim (2), the control means according to claim (1) at least activates or deactivates the operating means based on the color of a predetermined area of the cassette half itself. If the individual aspects of the cassette halves are different from the desired individual aspects of activation or deactivation of the operating means, the specified aspect of the cassette half is color identification means for detecting the color of a predetermined region of the cassette half and automatically activating or deactivating the operating means in an individual manner based on the detected color; It is made to include.

Therefore, it is further possible to freely select an individual mode of activation or deactivation of the operating means without being restricted by the color of a predetermined region of the cassette half-eye. Moreover, if the color of the predetermined area of the cassette half eye matches the color of the desired aspect of the operator, there is no need to take the trouble of pasting the label to the predetermined area of the cassette half, which saves the operator's effort. is reduced.

In the cassette tape recording/playback device according to claim (3), the color identification means according to claim (2) is characterized in that the color identification means according to claim (2) is characterized in that a single or plural predetermined wavelengths and a predetermined luminance are applied to a predetermined region of the cassette half. A light projecting means for projecting light, a light receiving means for receiving the light reflected from a predetermined area and deriving an output according to the amount of received light at a predetermined wavelength, and a cassette by level-discriminating the output of the light receiving means. The color discrimination circuit detects the color of a predetermined area of the half and automatically activates or deactivates the operating means in an individual manner based on the detected color.

Therefore, in addition, colors can be reliably identified,
Malfunctions can be prevented.

[Brief explanation of drawings]

FIG. 1 is a simplified diagram of an embodiment of the present invention, FIG. 2 is an electric circuit diagram of the color discrimination means IO, FIG. 3 is a diagram showing the spectral sensitivity characteristics of the photodiode 13, and FIG. 4 is a diagram showing the spectral sensitivity characteristics of the photodiode 13. 14 is a diagram showing the spectral sensitivity characteristics of No. 14, and FIG. 5 is an electric circuit diagram of a part of the color discrimination means IO according to another embodiment of the present invention. 1...Cassette tape deck 2.3...Noise reduction system 8...Control means 9...Label lO...Color identification means 11, 12...Light emitting diode! 3.14.85...Photodiode 15...Color judgment circuit 17...Cassette half relative screen

Claims (3)

[Claims] (1) In a cassette tape recording/playback device equipped with a single or multiple operation means that is activated or deactivated when recording or playing back a cassette tape stored in a cassette half, the activation or deactivation of the operation means control means for detecting the color of a predetermined region of the cassette half corresponding in advance to the individual manner of activation and automatically activating or deactivating the operating means in an individual manner based on the detected color; A cassette tape recording/playback device characterized by: (2) The control means includes at least an individual mode of activation or deactivation of the operating means based on the color of a predetermined area of the cassette half itself and a desired activation or disabling of the operating means. a label affixed to a predetermined area of the cassette half in a color matching the specific mode of activation or deactivation of the operating means, if the specific mode differs; and a color of the predetermined area of the cassette half. cassette tape recording and playback according to claim (1), characterized in that the cassette tape recording and playback according to claim (1), further comprising a color identification means for automatically activating or deactivating the operating means in an individual manner based on the detected color; device. (3) The color identification means includes a light projecting means for projecting light of a single or multiple predetermined wavelengths and a predetermined brightness onto a predetermined region of the cassette half, and light reflected from the predetermined region. A light receiving means that receives light and derives an output according to the amount of received light at a predetermined wavelength; 3. The cassette tape recording/playback device according to claim 2, further comprising a color determination circuit for automatically activating or deactivating the operating means in an individual manner.