JPH0456391B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an adapter, and more specifically, to an adapter that is used in conjunction with a conventional cassette deck to allow the deck to reproduce signals generated by another reproduction device (such as a compact disc player). be.

Recently, various new formats that enable high-quality reproduced sound have been commercially available, one of which is the compact disk device. A typical compact disk player uses a beam of laser light to scan a rotating disk on which audio signals are recorded in the form of "pits" and "lands" forming concentric circular tracks. There is. Since these audio signals are detected by a laser beam, any contact between the "pits" and "lands" by the pick-up needle is completely avoided, so that the quality of the recorded signal does not deteriorate even if the disc is run several times. Therefore, compared to conventional records and record players, where the needle vibrates as a function of a signal etched into the so-called sound grooves while running on a spiral track, this type of compact disc That player is a significant improvement. Because compact discs and their players are much smaller than conventional records and players, they have been named "compact discs" and "compact players" by related industries.

Prior to the commercialization of compact discs and their players, audio equipment such as car stereos typically used cassette tapes and so-called 8-track cartridge tapes as audio signal reproduction sources. Both cassette tape and cartridge tape use magnetic tape on which high-frequency music selections are recorded. Furthermore, audio equipment compatible with this type of cassette tape and cartridge tape is equipped with a tape deck, and when a cassette tape or cartridge tape is loaded, this tape deck plays back the various signals recorded on the magnetic tape and then outputs these signals. It converts the sound into audio sound. Additionally, consumers are currently investing large sums of money in high quality audio equipment such as car stereos in order to enjoy pre-recorded cassette tapes and cartridge tapes.

With the advent of compact discs, it is expected that future car stereos will be equipped with compact disc players, allowing consumers to enjoy the same compact discs in their cars as they do at home. Currently, some manufacturers are producing portable compact disc players, but car stereo devices compatible with this type of player are currently difficult to obtain. Therefore, when using a portable compact disc player in a car, not only can you not listen to conventional car stereo equipment that is generally expensive and has a high-fidelity playback function,
In order to enjoy the playback sound of a compact disc, the use of a conventional headphone is required, and the headphone must be connected to the compact disc player through a suitable plug and headphone jack. The dangers of drivers wearing headphones while driving a car are obvious.

It is also clear that a consumer who owns both a compact disc player and a car stereo would be required to purchase two types of software in order to listen to both devices. That is, in addition to compact discs for compact disc players, these consumers need to purchase cassette tapes or cartridge tapes for car stereos.
It is easy to understand the disadvantages and cost problems caused by such double investment in software.

Furthermore, there may be a desire to use the hi-fi function of an audio device equipped with a cassette deck to reproduce the sound generated by another reproduction device (for example, the sound generated by the sound channel of a television receiver, shortwave radio, CB device, etc.). If such other playback devices include simple headphone jacks, the present invention addresses this type of need.

Therefore, an object of the present invention is to provide an adapter for operating an audio device with a cassette (or cartridge) deck, such as a car stereo, together with another playback device, and allowing the cassette-type audio device to play back signals generated by the other playback device. It is about providing.

Another object of the present invention is to provide an adapter that can be used in a cassette-type audio device such as a car stereo, thereby avoiding the aforementioned double investment in software.

It is also an object of the present invention to provide a relatively low cost adapter for "converting" a cassette audio device to another format.

Still another object of the present invention is to provide an adapter that allows a compact disc player (or a playback device of a different format) to be compatible with a cassette deck without changing the wiring or modifying the cassette type audio device.

Other objects, advantages, and features of the invention will become apparent from the following detailed description, and novelty thereof is pointed out in the claims.

The adapter of the present invention is for reproducing a signal generated by another reproducing device such as a compact disc player as audio sound by an audio device equipped with a cassette deck. This adapter has a housing that is approximately the same shape as a standard cassette for a cassette deck. In this manual, "cassette" refers to ordinary reel-to-reel magnetic cassette tape (so-called "standard"
``Philips'' type cassettes or so-called ``micro'' cassettes), but also so-called 8-track cartridges, which are well known to those skilled in the art.

The housing of the adapter of the present invention has at least one opening for accommodating at least one reel shaft of a cassette deck, and a recording head positioned so as to be in contact with a standard playback head installed in the cassette deck. It also has built-in. Also 2
A conductive wire, such as a book lead wire, is connected at one end to a plug compatible with a standard headphone jack of another playback device, and at the other end to a recording head via an audio circuit.
When this adapter is loaded into a cassette deck and both the deck and another playback device are operated, the signal generated by the other playback device is introduced into the recording head via the conductor and the audio circuit, and from this recording head the cassette deck plays back. After being applied to the head, it is played back by the audio device.

Preferably, the conductive wire is inserted into the housing through an opening provided in the outer peripheral wall of the housing, and this opening allows the conductive wire to be inserted into the internal mechanism of the cassette deck in either a front-loading type or a side-loading type. It is arranged so as not to interfere even in the case of In one embodiment, the opening is in a rear corner of the adapter housing, and the rear corner is formed at the junction of a side wall portion of the peripheral wall and a rear wall portion; is opposite the front wall that houses the recording head.

When loading a standard cassette into a car stereo,
This rear corner is easily accessible via the entry point of a conventional case deck.
There is no problem in making the aforementioned conducting wire protrude from this entry and connecting it to another playback device. In yet another embodiment, such a peripheral wall opening comprises a notch, the notch extending over the entire length of the rear wall portion and partially along one or both of the pair of side wall portions. .

The following detailed description is offered by way of example only and is not intended to limit the invention to the illustrative embodiments, which are best understood with reference to the accompanying drawings.

Now, each drawing will be explained. All similar parts in each figure are designated with the same numerals. In each drawing, the adapter 10 includes a housing 12, which includes a ceiling wall 14, a bottom wall 16, a front wall 18, a back wall 20, a right side wall 19,
It is formed from the left side wall 21. The rear wall 20, the right side wall 19, and the left side wall 21 can be considered as a rear wall portion, a right side wall portion, and a left side wall portion of the outer peripheral wall, respectively. In a preferred embodiment, adapter 1
Because of the need to load the 0 into the cassette deck, the shape of the housing 12 is identical to a conventional Phillips-type (i.e., standard) open-reel cassette. However, it will be understood that the shape of the housing 10 will change depending on the type of cassette deck to which the adapter 10 is attached.
Therefore, the shape of the housing 12 is designed to accommodate the needs of reproducing recorded audio signals from magnetic tape, such as a conventional 8-track cartridge, microcassette, or other commercially available cassette (or cartridge).
It can be formed into any mold.

In the preferred embodiment, housing 12 includes a pair of openings 22, 24 extending through top wall 14 and bottom wall 16 as shown. These openings 22 and 24 are
When loaded into a conventional cassette deck, it accommodates a conventional reel shaft built into the deck. If the cassette deck to which the adapter 10 is attached has a single reel shaft, such as an 8-track cartridge player, both openings 22,
It is sufficient to provide only one opening among the 24 openings.

The top wall 14 and bottom wall 16 of the housing 12 further include holes 32, 34, 36, 38 as shown in FIG.
These holes are almost identical to the holes in a conventional cassette. Hole 32 or hole 34 is for receiving a conventional capstan, normally mounted on a cassette deck, which serves to run the tape contained in the cassette past the playback head of the deck.
Also, since a reverse cassette deck is equipped with a double capstan, these holes 3
2, 34 are configured to accommodate each of the capstans. Holes 36 and 38, on the other hand, are for receiving guide pins normally equipped on a cassette deck, and these guide pins serve to keep the cassette in place when it is installed on the deck.

The front wall 18 of the housing 12 is provided with openings 26, 28, and 30, as best shown in FIG. In conventional cassette tapes, the opening 26 allows the playback head to come into contact with the tape stored in the cassette when it is loaded into the playback head (or recording/playback head) of an ordinary cassette deck, thereby allowing the signals on the magnetic tape to be played back (or recorded). ). On the other hand, in the adapter 10, a recording head 40 is installed inside the housing 12, and this recording head 40 is connected to the adapter 10.
is disposed within the opening 26 so as to come into contact with the aforementioned playback head when mounted on the cassette deck. Preferably, the recording head 40 is a stereo recording head capable of recording two channels of audio signals (ie, left and right channels), and is compatible with conventional recording heads typically installed in ``auto-reverse'' cassette decks. It is preferable to maintain the character. Therefore, in order to work with an auto-reverse cassette deck having dual playback heads for auto-reverse mode, the recording head 40 is provided with compatible dual playback heads. Also, any suitable method may be used to place the recording head 40 in proximity to the opening 26 of the housing 12. The method of installing recording head 40 is not part of the invention itself. As will be described below, the audio signal is fed to the recording head 40 and then transmitted from the recording head 40 to a standard playback head of a cassette deck connected to an adapter. As far as audio equipment equipped with this cassette deck is concerned, this type of transmission signal is processed in the same way as a signal played back (or picked up) from a cassette tape.

Openings 28, 30 in the front wall 18 are intended to accommodate conventional pinch rollers normally found on cassette decks. Depending on whether the cassette deck is operated in the forward or reverse direction (e.g. to accommodate the cassette deck's auto-reverse mechanism), only one of these openings will accommodate the pinch roller. Become. Further, which opening the pinch roller should be inserted into is determined by whether to maintain the vertical position when loading the adapter onto the deck, or whether to turn it upside down.

As shown in FIG. 1, a notch 46 is provided in the left rear corner of the housing 12. This notch 4
6 is shown in FIGS. 3-4 and in more detail in FIG. It will be appreciated that this cutout 46 extends partially into the rear wall 20 and the left side wall 21 of the outer circumferential wall. A conductor 42 such as a two-core cable passes through this notch 46 to the housing 12.
In addition to being inserted into the housing 10
It is connected to the built-in audio circuit (described later). Of course, this conducting wire 42 is flexible and its movement is not restricted, so the notch 46
can move within. This notch 46 is preferably chamfered at both ends, so that the conductor 4
2 is brought close to one end of the notch 46, the conducting wire 42 can be releasably fixed.

This conductor 42 includes two insulated wires,
This conductor is coupled at one end to the audio circuit described above and has a plug 44 at its opposite end. This plug 44 uses a commercially available standard stereo mini-plug, and this plug can be inserted into the jack of the playback device when the medium of the playback device cannot be connected, unlike a cassette deck. For example, the playback device may be a conventional compact disc player, preferably a portable compact disc player. Since the plug 44 is of course connectable to other playback devices in any desired format, the plug 44 transfers the audio signal played back by the playback device to the conductor 42.
It has the function of supplying On the other hand, the conductor 42 sends the thus reproduced audio signal to the recording head 40 via the audio circuit shown in FIG.

Next, FIG. 6 will be explained. In the drawing,
Conductor 42 comprises two independent wires, each carrying a separate audio signal channel. When using adapter 10, it is assumed that the compact disc player (or other playback device) produces stereo left and right channel audio signals. As before, the left channel and right channel audio signals are transmitted by separate wires. The audio circuit connected to the conductor 42 has separate frequency response balancing circuits for the left channel and the right channel, each balancing circuit containing an RC circuit as shown. Also, a frequency balancing circuit with resistor R ₁ and capacitor C ₁ is connected to one wire, but resistor R ₂ and capacitor
A frequency balance circuit with C ₂ is connected to another wire. Both capacitors C ₁ and C ₂ are connected to a reference potential such as ground. The connection defined by resistor _R1 and capacitor _C1 is connected to recording head 40.
while the connection defined by resistor R ₂ and capacitor C ₂ is connected to the other terminal of recording head 40 . This recording head 4
It will be appreciated that the 0 is equipped with a conventional stereo recording head which separately accepts and records the left channel and right channel audio signals on two tracks. Also adapter 1
A normal cassette deck to which the 0 is installed is equipped with a stereo playback head corresponding to the recording head 40. Therefore, recording head 4
If the audio signals of the left channel and the right channel are added separately to 0, they will be picked up by the playback head of the cassette deck via the adapter 10. It is also preferable that the housing integrally molded with the recording head 40 is grounded, and this housing contacts the housing of the playback head of the cassette deck to connect the cassette deck and the adapter 1.
Create a common ground between 0 and 0.

Next, the effect will be explained. To use the output of a compact disc player (or other playback device) with an audio device (such as a car audio system) equipped with a cassette deck, first connect the plug 44 to the headphone jack of the compact disk player (or other playback device). do. Next, the adapter 10 is loaded into the cassette deck. Cassette decks of this type are usually either "front-loading" or "side-loading", such as those found in car audio decks. In the case of a front-loading deck, the front wall 18 of the adapter 10 is first inserted into the entry notch of the deck, but in the case of a side-loading deck, the front wall 18 of the adapter 10 is inserted into the entry notch of the deck.
0 side wall 19 is first inserted into the entry notch of the deck. It will be appreciated that when the adapter 10 is loaded onto a front loading deck, the conductor 42 will travel within the cutout 46 and into the chamfer in the rear wall section 20. On the other hand, adapter 1
0 is mounted on a side-loading deck, the conductive wire 42 is configured to move within the notch 46 and finally reach the chamfered portion provided on the left side wall portion 21. Therefore, the notch 46 and the mobility of the conductor therein allow the adapter 10 to be loaded into either front-loading or side-loading decks, with the conductor 42 blocking the deck's entry notch. Never. Even if a door is provided in this entry notch, the conducting wire 42 will not interfere with the door.

After the adapter 10 is mounted on the cassette deck as described above, the deck is operated to advance a conventional head support, such as member 54 of FIG.
bring into contact with. The pinch roller 52 similarly attached to the member 54 also moves, as if the adapter 10
This pinch roller 52 will penetrate the opening 30 (see FIG. 2) as if it were a conventional cassette tape. Next, when a compact disc player (not shown) is operated, the playback signal from the player is transmitted through the plug 44 to the conductor 42.
After being frequency-balanced by the action of the audio circuit shown in FIG. 6, the signals are separately applied to the stereo recording head 40 as left channel and right channel audio signals. These signals are transmitted from the recording head 40 to the playback head 50 of the cassette deck, and then processed by a conventional audio device connected to the cassette deck. In this manner, the audio signal produced by the compact disc player is transmitted via the adapter 10 to a conventional audio device containing a built-in cassette deck, and then the audio sound is reproduced by the audio device. Therefore, even when a current car stereo device is operated simultaneously with a portable compact disc player to reproduce the sound generated by the player, there is no need to modify the current car stereo device electrically or structurally. Not at all. Furthermore, it will be understood that if the adapter 10 is removed from the cassette deck mounted on the car stereo device and a conventional cassette tape is loaded, the cassette tape sound can be reproduced.

Housing 12 may be formed of a suitable plastic material and may be hollow to accommodate the audio circuitry shown in FIG. Alternatively, the housing 12 can be epoxy-loaded, if desired. Further, the arrangement of the recording head 40 in the housing 12 allows the recording head to rotate forward and backward, but is preferably configured to prevent lateral movement of the head, ie, from side to side. Any suitable mounting device can be used to achieve this purpose. The forward and reverse rotation of the recording head 40 accommodates the various positions and forward and reverse rotation of the playback head of the cassette deck.

The position of the gap on the recording head 40 is aligned with the gap on the playback head 50.

Another embodiment of the invention is shown in perspective view in FIGS. 7A-7B, which differs from the previous embodiment in the shape of the cutout 46. In this embodiment, the notch 46 extends to either corner of one of the outer circumferential walls of the adapter 10. As particularly shown in FIGS. 7A-7B, this notch 46 extends the entire length of the back wall 20 and also extends partially into the side walls 19 and 21. As clearly shown in the drawing, both ends of this notch 46 are chamfered, and these chamfers are provided on both left and right side walls of the outer peripheral wall, and each of the chamfer dimensions is equal to that of the rear wall 20. The width of the cutout 46 is larger than that of the notch 46 in the figure. Thereby, the conducting wire 42 can slide over the entire length of the notch 46 and can be placed at any location on the back wall 20 of the adapter 10. This conducting wire 42 can also move and penetrate into the notch 40 provided on one of the left and right side walls of the adapter 10, so if this conducting wire is placed in the notch 46, this conducting wire can be moved into the left side wall. 21 or the chamfer of the right side wall 19 so as to be releasably restrained. Therefore, either the conductor 42 is placed on one of the chamfers of the notch 46 or the adapter 10
Notch 4 provided on one of the left and right side walls of the outer peripheral wall of
It will be appreciated that the six-part arrangement allows the adapter 10 to be loaded into a side-loading cassette deck. If this notch 46 is partially provided in the left and right side walls, the adapter 10 can be attached to either the left or right side loading type cassette deck, and the conductor 42 will not interfere with the entry notch of the cassette deck. .

As shown, the notch 46 also extends over the entire length of the rear wall portion 20, but its intermediate portion is chamfered near both left and right corners of the outer peripheral wall.
These additional chamfers have approximately the same radius as the chamfer of the rear wall 20 shown in FIG. 5, and are arranged at each corner. Therefore, while the conductor 42 protrudes outward from the rear wall 20, it is restrained by one of the chamfered portions provided near both the left and right corners of the outer circumferential wall, so that the adapter 10 is of the front loading type. It can be loaded into the cassette deck.

It will be appreciated that the embodiment shown in FIGS. 1-7 may be adapted to either a front-loading or side-loading cassette deck.
In both embodiments, the conductor 42 is inserted through the outer peripheral wall of the adapter 10, but the structure is such that the conductor 42 does not interfere with the operating parts of the cassette deck when the adapter 10 is attached to the cassette deck. .

Yet another embodiment of the invention is shown in FIG. This embodiment is compatible with the auto-shut-off detection mechanism installed in the cassette deck, and also has an automatic reversing mechanism formerly called "auto-reverse" (indicating the end of the cassette tape by detecting the stoppage of the reel shaft during playback mode). The adapter is also intended to be compatible with For example, when tape is fed from the left reel to the right reel of a conventional cassette, the tape feeder stops or reverses (due to tape reversal) so that rotation of the left reel axis becomes undetectable. Conversely, when the tape is fed from the right reel to the left reel of the cassette, rotation of the right reel shaft becomes undetectable even when the cassette deck's auto-shut-off or auto-reverse mechanism is activated. Normally, when the tape is run from left to right, the right reel shaft acts as a tape winding shaft, and the left reel shaft only idles. That is, the left reel shaft functions as a delivery side reel shaft and rotates by the delivery action of the left reel tape. Conversely, when the tape is run from right to left, the left reel shaft acts as a tape winding shaft, but the right reel shaft simply spins idly.
It serves as the tape feed reel shaft. In the embodiment shown in FIGS. 1-7, both the left and right reel shafts of the cassette deck are inserted through the openings 22 and 24 of the adapter 10, but the mechanism is such that only one reel shaft is driven. The other reel shaft does not rotate because the tape is not fed out at all. Therefore, the auto-shut-off mechanism or the auto-reversing mechanism described above is continuously operated because the reel shaft on the delivery side does not rotate.

The embodiment of FIG. 8 overcomes the drawbacks of such continuous operation that occur in automatic shut-off or automatic reversing mechanisms. In this embodiment, the rotary reels 60, 62 are attached to the housing 1 of the adapter 10.
2, and the hub 6 of these reels
8 and 70 are provided with conventional teeth that mesh with each of the drive shafts of the cassette deck. Furthermore, reel 6
Teeth 64 and 66 are provided on the outer periphery of 0 and 62,
Endless band 7 wound around reels 60 and 62
It is adapted to engage with the opening of No. 2. When the reel 60 is driven by the drive shaft of the cassette deck, the endless band 72 also rotates in accordance with the rotation of the reel 60. As a result, the reel 6
2 is also driven. Conversely, if the reel 62 is driven by the drive shaft of the cassette deck, it is clear that the endless band 72 will also rotate in accordance with the rotation of the reel 62, thereby driving the reel 60 as well.

From the foregoing description, it will be understood that the endless band 72 acts as a rotational transmission device that mechanically connects the reel hubs 68 and 70. This mechanical connection transmits the rotational drive between the reels, so that the reel 62 rotates in response to the drive of the reel 60, or vice versa. Therefore,
Opening 2 of housing 12 on reels 60, 62
By providing the hubs 68, 70 which are concentric with the adapters 2, 24, continuous operation of the auto-shut-off mechanism or the auto-reversing mechanism is prevented in the cassette deck to which the adapter 10 is attached. If desired, reel 6
It will be clear that other mechanical linkages or rotational transmission devices can be used for the mechanical connection between 0 and 62. For example, endless band 72
Alternatively, a rotary gear transmission such as that described in US patent application Ser. No. 717,450 can also be used. Still alternatively, the endless band 72 could be provided as a friction drive band (or cable) and the teeth 64, 66 could be omitted from the outer periphery of the reels 60, 62. in this case,
The endless band works as a friction drive mechanism that mechanically connects the hubs of the reels, so a simple tape can be attached to the reels 60, 6 to transmit the operation between the reels.
It is also possible to wrap it around 2.

Although the invention has been described with respect to the embodiments shown in the accompanying drawings, those skilled in the art will recognize that many changes and modifications can be made without departing from the spirit and scope of the invention. For example, the shape of the housing 12 could be changed to other tape containers, such as standard or Phillips cassettes, 8-track cartridges, microcassettes, and the like. Depending on the shape of the housing, an appropriate opening is cut into the housing, and this type of opening allows the drive shaft of the cassette deck, capstan, pinch roller,
Accommodates elements such as guide pins. In addition, the conductor 4
2 is loosely inserted into the notch 46, the adapter 10 can be attached to either a front-loading type or a side-loading type cassette deck without any problem. , or if it is provided only on the side wall portion 21, the adapter 10 can be used exclusively for front-loading type decks or side-loading type decks.

Furthermore, the notch 46 shown in FIGS. 7A-7B
The intermediate chamfered portion can also be omitted. Further, in order to attach the adapter 10 to a "rear loading" type cassette deck, the restraining portion of the conductor 42 of the housing 12 can be changed as appropriate.

It is intended that the claims appended hereto cover the foregoing description and other equivalent changes and modifications.

[Brief explanation of the drawing]

FIG. 1 is a plan view of the adapter of the present invention, and schematically shows the adapter loaded into a conventional cassette deck. FIG. 2 is a front view of the adapter of FIG. 1. FIG. 3 is a rear view of the adapter of FIG. 1. FIG. 4 is a left side view of the adapter of FIG. 1. FIG. 5 is a perspective view of the rear corner of the adapter of FIG. 1. FIG. 6 is a schematic diagram of the electrical circuit of the adapter of FIG. 7A-7B are perspective views of another embodiment of the adapter of the present invention.
FIG. 8 is a drawing showing a mechanism installed in the adapter for interlocking the adapter with a cassette deck equipped with an auto-shut-off mechanism or an auto-reversing mechanism.

Claims (1)

[Scope of Claims] 1. An adapter for reproducing a signal generated from a device having a headphone jack as audio sound by a cassette reproducing audio system having a front-loading and side-loading type cassette deck. An adapter for use in which the cassette deck has a pair of spaced apart reel-drive spindles and a playback head, the adapter being substantially completely enclosed within the cassette deck, the housing having the shape of a cassette normally used for the cassette deck. a housing having a pair of openings for receiving said pair of reel-drive spindles in conjunction with said cassette deck; a recording head disposed within a housing; an audio circuit device electrically connected to the recording head within the housing for transmitting an audio signal to the recording head; and one end coupled to the audio circuit device within an adapter. a conductor device extending from said adapter and having its other end coupled to a plug mating with a headphone jack of said device; after final assembly of said adapter for use by a user; the conductor device is movable between a first position in which the adapter is used with the front loading cassette deck and a second position in which the adapter is used with the side loading cassette deck; When the adapter is installed in such a cassette deck, the conductor device can be freely pulled out of the cassette deck without interfering with the cassette deck, so that the adapter is received in the cassette deck and the plug is inserted into the headphone jack. When connected to the cassette playback audio system, a signal generated by the device is applied to the recording head and is applied to the playback head for reproduction by the cassette playback audio system. 2. The adapter according to claim 1, wherein the audio circuit device includes a frequency characteristic compensation circuit. 3. The adapter according to claim 1, wherein the audio circuit device includes a compensation device consisting of a resistor device. 4. The adapter according to claim 1, wherein the plug and the conductor device are small. 5. The adapter according to claim 1, wherein the thickness of the conductor device is less than or equal to the thickness of the housing. 6. The adapter according to claim 1, wherein the cassette deck is an auto-reverse type having dual playback heads for auto-reverse,
An adapter having a dual recording head in which said recording head is compatible with said dual playback head. 7. The adapter of claim 1, wherein the conductor device extends from the adapter through an opening in an outer peripheral wall of the adapter. 8. The adapter according to claim 7, wherein the housing has a ceiling wall and a bottom wall, the pair of openings penetrate the ceiling wall and the bottom wall, and the first
and second reel hubs are each substantially concentric with said opening, such that when one reel hub is driven by the reel drive spindle, the other reel hub is substantially concentric with said first opening.
and an adapter driven by an interconnection device interconnecting the second reel hub. 9. The adapter according to claim 7, wherein the opening of the outer peripheral wall is provided at a corner. 10. The adapter according to claim 7, wherein the opening in the outer peripheral wall extends continuously from one corner to the other corner of the outer peripheral wall. 11 Reproducing a signal generated from a device having a headphone jack as audio sound by a cassette reproducing audio system comprising a cassette deck having at least one reel drive spindle and one reproducing head in a front-loading or side-loading manner. An adapter comprising: a housing having the shape of a cassette typically used in the cassette deck, the housing having at least one opening for receiving the at least one reel drive spindle, and an outer circumferential wall having the opening; a recording head disposed within said housing for contacting a playback head of said cassette deck when received by said cassette deck; and an electrical connection with said recording head within said housing for transmitting an audio signal to said recording head. an audio circuit device connected to the audio circuit device in the adapter at one end to a conductor device extending from the adapter and the other end to a plug mating with the headphone jack of the device; the outer circumferential wall has a rear wall and two side walls, and the opening of the outer circumferential wall extends partially along each part from a corner of the rear wall and one of the side walls. If the cassette deck is of a front-loading type or a side-loading type, the cassette deck has a notch extending along the width of the cassette deck, and the notch has a radius range at both ends that is larger than the width of the notch. when the adapter is received in the cassette deck to connect the plug to the headphone jack. When a signal generated by the cassette head is applied to the recording head, the signal is applied to the playback head and reproduced by the cassette playback audio system. 12. The adapter according to claim 11, wherein the conductor device is a pair of insulated wires that pass only through a cutout portion extending along the rear wall or a cutout portion extending along the one side wall. adapter with. 13. The adapter of claim 11, wherein the opening in the outer circumferential wall has a cutout extending the entire length of the rear wall and partially along each side wall. 14. The adapter according to claim 11, wherein the audio circuit device includes a frequency characteristic compensation circuit. 15. The adapter according to claim 14, wherein the playback device generates two channels of audio signals, the conductor device transmits the two channels of audio signals independently of each other, and the plug An adapter in which a channel audio signal is applied to the conductor device, and the frequency characteristic compensation circuit has two RC circuits, one circuit for each channel. 16. The adapter of claim 15, wherein the recording head has a two-channel recording head, each channel being connected to a respective RC circuit for receiving a frequency compensated audio signal.