JPS609936Y2 - Docking type tape recorder - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a docking type tape recorder that can be used by engaging a large-diameter speaker unit.

An ultra-compact tape recorder using a microcassette (trade name) developed by the applicant is used by being placed in a Y-shirt pocket or the like.

However, although ultra-compact tape recorders are highly portable, they are small overall and require the use of small-diameter speakers, making it difficult to record and playback with good frequency characteristics. I could not do it.

Furthermore, in order to make the entire tape recorder smaller, it is not only difficult to provide an equivalent circuit for recording and playback that can sufficiently compensate for the frequency characteristics, but also because the speaker is small in diameter. It was not possible to obtain sufficient frequency characteristics.

This invention solves the above-mentioned drawbacks, makes it possible to fit a large-diameter speaker unit into a tape recorder, and also provides a recording equivalent circuit inside the speaker unit, making it extremely suitable for playback using large-diameter speakers. It is an object of the present invention to provide a docking type tape recorder that can have frequency characteristics and has a simple configuration.

An embodiment of this invention will be described below with reference to the drawings.

Although not shown, the tape recorder used in this embodiment is a docking type tape recorder, such as Pearlcorder TDS-3 (trade name), in which an adapter is connected to one side of the tape recorder.

That is, as shown in FIG. 1, a built-in microphone 2 and an external microphone terminal 3 are connected within the tape recorder main body 1 so that input signals from either the microphone are supplied to the AGC circuit 4.

The output of the AGC circuit 4 is connected so as to be supplied to a first amplifier 6 via a recording side terminal 5R of a first selector switch 5 for switching between recording and reproduction modes.

The output of the first amplifier 6 is connected to be supplied to the second amplifier 10 via the recording side terminal 7R of the second changeover switch 7, the recording side terminal 8R of the third changeover switch 8, and a fixed resistor 9a. has been done.

The output from the second amplifier 10 is fed back as a signal to the AGC circuit 4, and the output is taken out to a small-diameter built-in speaker 12 or an earphone terminal 13 via a fourth changeover switch 11.

On the other hand, one end of the recording magnetic head 14 is connected to the playback side terminal 5P of the first changeover switch 5 and the recording side terminal 15R of the fifth changeover switch 15, and the other end is connected to the playback side terminal 5P of the first changeover switch 5 and the recording side terminal 15R of the fifth changeover switch 15. It is connected to the recording terminal 11R of the fourth changeover switch via the reproduction side terminal 15P and a recording equivalent circuit 16 that compensates for high frequencies.

Note that the fifth changeover switch 15 is grounded.

In addition, in contrast to the recording circuit 16, a reproduction equivalent circuit 17 that performs low frequency compensation is connected between the first amplifier 6 and the reproduction side terminal 7P of the second changeover switch 7. .

The tape recorder main body 1 connected in this way houses an extremely small power battery E, and this battery E is connected to the main switch 19 via the plug receiver 18.

The plug holder 18 is provided on one side of the tape recorder main body 1, and similarly to the plug holder 18, it is used to connect electrical contacts when accessories such as a speaker unit 20, which will be described later, is docked to the tape recorder main body 1. It is installed on the side.

That is, from the input end of the AGC circuit 4 to the first engagement contact 1a,
The second engagement contacts 1b are led out from the power supply end of the built-in microphone 2, and the third engagement contacts 1c are led out from between the second changeover switch 7 and the third changeover switch 8.

Note that 1d is a grounding contact.

The speaker unit 20 docked to the tape recorder main body 1 formed in this way is, for example, an FM-AM speaker unit.
It has a radio tuner 21 such as
1 is connected to a first amplifier 23 via a changeover switch 22.

The first amplifier 23 is connected to a second amplifier 25 via a volume 24, and the output of this amplifier 25 is supplied to a large-diameter speaker 26.

On the other hand, a recording equivalent circuit 27 that compensates for low frequencies during recording is connected to the output end of the first amplifier 23, and a first engagement contact 20a is connected to the speaker unit 20 from this recording equivalent circuit 27. It is derived from one aspect of

Further, a reproduction equivalent circuit 28 for compensating high frequencies during reproduction is connected to the tape side terminal 22b of the changeover switch 22, and a third engagement contact 20c is led out from this equivalent circuit 28.

Note that the third engagement contact 20b is grounded via the radio side terminal 29a of the changeover switch 29, and the fourth retaining contact 20d is similarly grounded.

The speaker unit 20 connected in this way houses a large capacity power battery E within the space allowed, and the battery E is connected not only inside the unit 20 but also through the plug holder 18 when docked. An insertion plug 30 is provided so that power can be supplied to the tape recorder main body 1.

As an example of using the tape recorder and speaker unit configured in this manner by docking them together, the case of recording will first be described.

When recording music or the like from the radio tuner 21, the output is sent to the recording equivalent circuit 27 via the first amplifier 23.
The signal is supplied to the AGC circuit 4 via the first engagement contacts 1a and 20a with the low frequency compensated.

The output from the AGC circuit 4 is amplified via the first and second amplifiers 6.10, and then compensated for high frequencies by the recording equivalent circuit 16 in the tape recorder as shown in Figure 2a. Then, the head 14 records the data on the tape.

On the other hand, when reproducing the reproduction output of a tape recorder through the speaker unit 20 having a large-diameter speaker 26, the output of the head 14 is amplified by the first amplifier 6, and the output of the head 14 is amplified by the first amplifier 6, and the reproduction output by the reproduction equivalent circuit 17 is As shown in the figure, the low frequency range is compensated, and the low frequency or high frequency range that cannot be compensated by the equivalent circuit 17 is compensated by the reproduction equivalent circuit 28 in the unit 20, and the width is amplified via the changeover switch 22. Therefore, music and the like can be heard from the large-diameter speaker 26 with extremely good frequency characteristics.

In this way, when recording and playing back only with an ultra-compact tape recorder, the output and frequency characteristics, which were rarely a problem because the speakers were small, become noticeable when played back with large-diameter speakers. In order to compensate for the frequency distortion, an equivalent circuit is provided within the speaker unit, and by sufficiently compensating for the amount that cannot be compensated for by the equivalent circuit within the tape recorder, extremely good frequency characteristics can be obtained.

In other words, in the present invention, a recording equivalent circuit for improving the recording frequency characteristics is purposely provided in the speaker unit, which is necessary only during reproduction, so that a good recording tape can be obtained.

Therefore, if you do the following, you can of course improve the quality of the subsequent playback output, but if you play the recording tape obtained in this way on another tape recorder that does not have a playback equivalent circuit, you can also use these tape recorders. It can also be expected to have ripple effects such as being able to obtain high-quality playback output.

Furthermore, since the tape recorder side can also be driven by the large capacity battery within the unit, there is no need to worry about unnecessary consumption of the battery of the portable tape recorder.

In this way, in the above embodiment, a recording/playback equivalent circuit is also provided in the tape recorder main body to compensate for the frequency characteristics, but the tape recorder main body must be compact, so sufficient compensation is required. It is not possible to provide an equivalent circuit that can do this.

However, the lack of frequency correction mentioned above can be sufficiently compensated for by incorporating an equivalent circuit for recording and playback into the docking type speaker unit, and it is possible to listen to music with good sound quality.

In the above embodiment, the equivalent circuit is provided inside the tape recorder main body, but in order to reduce the size, it may be provided in the speaker unit instead of in the tape recorder main body.

Further, the tape recorder may be provided with only one of the recording equivalent circuit and the reproduction equivalent circuit, so that the frequency can be corrected even in the tape recorder alone.

Furthermore, the speaker unit does not necessarily require a radio tuner.

As detailed above, according to this invention, by providing at least a recording equivalent circuit in the speaker unit and correcting the frequency, even an ultra-compact tape recorder can be used with a large diameter while having extremely good frequency characteristics. It is possible to provide a docking type tape recorder with a simple configuration, which can output reproduced sound from a speaker, and which can further downsize the tape recorder.

[Brief explanation of drawings]

Figure 1 is a circuit diagram showing an embodiment of this invention, Figure 2a,
b and c are diagrams for explaining the ipsilateral side. 1...Tape recorder body, 4...A
GC circuit, 5. 7. 8. 11. 25...
・Recording switch, 6, 10, 23, 25...
...Amplifier, 12...Built-in speaker, 14...
...head, 16,27...recording equivalent circuit, 17,28...playback equivalent circuit, 21...
... Radio tuner, 22, 29 ... Teleco.
Radio selection switch, 20...Speaker unit, 26...Large diameter speaker.

Claims (2)

[Scope of utility model registration request] (1) Equipped with an ultra-compact tape recorder having a small-diameter speaker and a large-diameter speaker unit that can be engaged with the tape recorder, at least a recording equivalent circuit is installed in the speaker unit to prevent recording of music, etc. A docking type tape recorder characterized by being capable of recording through a recording equivalent circuit. (2) Utility Model Registration A docking type tape recorder characterized in that the recording equivalent circuit according to claim 1 is provided in both the ultra-small tape recorder and the speaker unit.