JPS6235186Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an audio device having both a tape recorder and a radio.

Conventionally, in this audio device, when using a tape recorder, such as a conventional car stereo using a cassette tape, when a recorded cassette tape is loaded into the tape deck and a fast-forward operation is performed, the recorded source may be detected as an abnormal signal in the recording/playback head. The problem was that the sound was read out from the computer and played back as an abnormal and unpleasant sound from the speakers.

To prevent this kind of unpleasant sound from occurring, traditional car stereos require the volume to be turned down during the fast-forward operation, while in order to successfully play the desired source after fast-forwarding to a predetermined tape position. The user had to raise the volume again, which was inconvenient. Further, even if the recording and reproducing head is shot to prevent the abnormal and unpleasant sound from being reproduced during the fast forward operation, there is a drawback that the tape running sound and the motor sound are emphasized as unpleasant sounds.

This invention was made to eliminate the above-mentioned drawbacks, and by playing back the source received on the radio from the speaker during the fast-forwarding period of the recording tape, it is possible to use a simple and inexpensive device. It is an object of the present invention to provide an audio device that can eliminate abnormal sounds. In order to achieve the above object, the audio device of this invention includes a radio section and a tape recorder section, and a fast forward detection switch of the tape recorder is connected in parallel with a radio-tape recorder switching circuit to the power supply path of the radio. When the fast-forward detection switch is turned on during the fast-forward operation period, an output signal is generated from the radio receiving section, and the output signal is supplied to drive the sound reproduction section.

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

In FIG. 1, 10 is a DC power supply with an appropriate voltage;
20 is a tape recorder such as a car stereo, and 30 is a car radio section including a radio receiving section 31 including a tuning circuit and a low frequency amplifier (sound reproduction section) 32. Further, 33 is a speaker that converts the signal from the low frequency amplifier 32 into audio.

In the tape recorder 20, a cassette tape 22 is removably attached to a tape deck 21, similar to a known car stereo, and a recording/playback head 23 records data on the cassette tape 22 while running the attached cassette tape 22. A source such as played music is read out as an electrical signal, and this electrical signal is supplied to the reproduction circuit 24.

An output terminal of the reproducing circuit 24 is connected to an input terminal of a low frequency amplifier 32 of a car radio section 30.

Note that the tape recorder 20 is equipped with a plurality of operation buttons (none of which are shown) for selecting various operation modes such as recording, playback, fast forward, rewind, and stop, as is the case with known tape recorders. The tape recorder operates in a desired mode by operating the operation button.

Reference numeral 25 denotes a changeover switch for changing over the operation of the radio and tape recorder, and the movable contact 26 of this changeover switch 25 is in contact with the contact 25-1 on the radio side when the cassette tape 22 is not attached.

On the other hand, the cassette tape 22 is transferred to the tape deck 21.
When the tape recorder is attached to the tape recorder, the contact 25-2 is automatically switched to the tape recorder side.

The movable contact 26 of the changeover switch 25 is connected to the DC power supply 1
On the other hand, the contact 25-2 on the tape recorder side is connected to the power supply terminal of the playback circuit 24, and is also connected to the diode 34 for backflow prevention.
It is connected to the power supply terminal of the low frequency amplifier 32 via. On the other hand, the contact point 25-1 on the radio side is connected to the power supply terminal of the radio receiving section 31 of the car radio section 30 via the radio power switch 35, and is also connected to the low frequency amplifier via the reverse current blocking diode 36. 32 power supply terminals.

With this circuit configuration, when the cassette tape 22 is not loaded on the tape deck 21, the DC power is supplied to the radio receiving section 31 via the changeover switch 25.
is supplied to the low frequency amplifier 32, and the radio audio is reproduced, while the cassette tape 22
When mounted on the tape deck 21, the movable contact 26 of the changeover switch 25 is switched to the contact 25-2 on the tape recorder side, and the radio unit 30 is cut off from the DC power supply 10 and connected to the playback circuit 24 of the tape recorder unit 20. DC power is supplied to the low frequency amplifier 32, which operates as a tape recorder.

Reference numeral 27 denotes a fast-forward detection switch that is turned on in conjunction with the operation of a fast-forward operation button (not shown) of the tape recorder section 20, and the changeover switch 2
5 and is connected to the radio's power supply line in parallel. That is, one contact of this fast forward detection switch 27 is connected to the movable contact 26 of the changeover switch 25, that is, to the DC power supply 10, and the other contact is connected to the power supply terminal of the radio receiver 31, and the changeover switch 25 is switched to the tape recorder side, DC power is supplied to the radio receiving section 31 and low frequency amplifier 32 via the fast forward detection switch 27 during fast forward operation.

In the audio device configured as described above, when the cassette tape 22 is not mounted on the tape deck 21, the movable contact 2 of the changeover switch 25
6 is a contact point 25-1 on the radio side, through which DC power is supplied to the power switch 35. Therefore, when the power switch 35 is turned on, DC power is supplied to the radio receiver 31 and the low frequency amplifier 32 via the diode 36, and the source of the broadcast station tuned by the radio receiver 31 is reproduced from the speaker 33.

Note that in this state, the tape recorder 20 is inactive.

Meanwhile, transfer the cassette tape 22 to the tape deck 21.
When installed, the movable contact 26 of the changeover switch 25
is switched to the contact 25-2 on the tape recorder side, DC power is supplied to the reproducing circuit 24, and the tape recorder 20 can be operated. Further, this DC power is also supplied to the low frequency amplifier 32 via the diode 34. For example, when a playback button (not shown) is operated, the recording/playback head 23 converts the source recorded on the cassette tape 22 into an electrical signal and supplies it to the playback circuit 24, similar to a known tape recorder. be done.

The low frequency signal amplified to a predetermined level by the reproduction circuit 24 is supplied to the low frequency amplifier 32, and the audio recorded on the cassette tape 22 is reproduced from the speaker 33. In this state, no DC power is supplied to the radio receiving section 31, and the radio is inactive.

Next, when a fast forward button (not shown) is operated to select a source recorded on another part of the cassette tape 22, the cassette tape 22
is fast forwarded.

On the other hand, the fast forward detection switch 27 is turned on,
DC power is supplied to the radio receiving section 31 via this fast forward detection switch 27, and the radio receiving section 31
A low frequency signal of a program source of a broadcast station tuned to is supplied to a low frequency amplifier 32, and the sound of this broadcast is reproduced from a speaker 33 at a predetermined volume.

During the fast forward operation, the playback circuit 24 supplies the low frequency amplifier 32 with an unnecessary signal generated from the recording/playback head 23 due to fast forwarding of the tape, but this unnecessary signal is supplied from the radio receiving section 31. Masked by the signal, the speaker 33 will not reproduce the unpleasant noise that accompanies tape fast forwarding. Further, by emitting sound from the speaker 33 during the fast-forward operation, tape running sound and motor sound are also masked, thereby preventing them from being emphasized.

In the above embodiment, the fast forward detection switch 2
5 is linked to the fast-forward button, but any mechanism may be used as long as it is a switch that is automatically turned on when the tape is fast-forwarded.

In addition, the changeover switch 25 is connected to the tape recorder 20.
However, instead of this, a changeover switch is provided between the output side of the reproducing circuit 24 of the tape recorder 20, the output side of the radio receiving section 31, and the input side of the low frequency amplifier 32. In addition, a fast forward detection switch may be connected in parallel with the changeover switch between the radio receiving section 31 and the low frequency amplifier 32, so that the signal from the radio receiving section 31 is applied to the low frequency amplifier 32 during fast forwarding. .

Alternatively, a fast forward detection switch is provided in parallel with the changeover switch at an appropriate location on the power supply path of the radio, and when the fast forward detection switch is turned on, the radio receiving section is activated and the radio program source is played back from the speaker 33. You may also do so. It goes without saying that this invention can be applied to an audio device having both a tape recorder and a radio using a circuit system other than the above embodiment.

As detailed above, this invention is an audio device that functions as both a tape recorder and a radio, and the radio source is played from the speaker when the tape is fast-forwarded, so unnecessary abnormal sounds are played back even when the tape is fast-forwarded. You can eliminate the problems caused by
It does not cause discomfort to the user.

In addition, with conventional devices, in order to prevent abnormal sounds from being played when fast-forwarding a tape, it was necessary to lower the volume once, complete fast-forwarding, and then raise the volume again. According to , it is convenient to use because there is no need to operate the volume even when fast forwarding the tape.

In addition, since the circuit configuration is simple, there is an advantage that noise during fast forwarding of the tape can be eliminated at low cost.

Although the above embodiment has been described with respect to a car stereo, this invention can also be applied to other types of audio equipment that function as both a tape recorder and a radio.

[Brief explanation of the drawing]

FIG. 1 is an electrical circuit diagram showing an embodiment of this invention. 10...DC power supply, 20...tape recorder,
21... Tape deck, 22... Cassette tape, 23... Recording and playback head, 24... Playback circuit, 25... Changeover switch, 27... Fast forward detection switch, 30... Car radio section, 31... Radio receiving section , 32...Low frequency amplifier, 33...Speaker.

Claims (1)

[Scope of utility model registration request] A tape recorder section, a radio reception section, an audio reproduction section that receives signals from both of the above sections and reproduces the acoustic output corresponding to the signal, and which acoustic output of the tape recorder or the radio is to be reproduced. In an audio device equipped with a switching circuit for selecting
A fast forward detection switch for detecting tape fast forward operation of the tape recorder section is connected to the power supply path of the radio in parallel with the switching circuit, and during the fast forward operation period, the detection switch is turned on and an output signal is output from the radio receiving section. 1. An audio device characterized in that a sound reproduction section is driven by the output signal being supplied.