JPS63308764A - Radio cassette tape recorder incorporating fm stereo oscillator - Google Patents

Abstract

PURPOSE:To widely transmit a voice singly or at the same time with a reproducing signal from a CD or the like by inputting a reproducing signal from the CD or a tape to an FM stereoscopic oscillator via a changeover switch and using a reception rod antenna for the transmission. CONSTITUTION:An FM oscillation mode switch composed of antenna changeover switches 8, 12 is selected to the position of an FM stereoscopic oscillator 7, a power supply 13 is connected to the position of the oscillator 7 and a rod antenna 9 is connected to the output of the oscillator 7. In bringing a CD reproducing circuit 1 into the reproducing state in this state, a reproducing signal of the CD is inputted to the oscillator 7 through an LPF 2 and a changeover switch 5, move over outputted to the outside as an FM radio wave from the rod antenna 9. On the other hand, the CD reproduction circuit 1 or the tape recorder circuit 3 is brought into the reproducing state and a microphone jack is inserted to the microphone circuit 4, then the reproducing signal from the CD or the tape and the voice of an operator are outputted externally as the FM radio wave.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a radio cassette tape recorder with a built-in FM stereo oscillator, and particularly to an FM radio cassette tape recorder that can transmit the voice of the operator of the device and also has a wide effective reception range. This invention relates to a radio cassette tape recorder with a built-in stereo oscillator.

[Conventional technology]

Conventionally, for example, Hitachi's analog player, BT-1
0/M etc., it is equipped with an FM stereo oscillator and transmits radio waves as a simple FM broadcasting station, and the radio waves are received by an FM receiver or radio cassette tape recorder, etc., so that even if the player is far from the analog player, it can listen to music. It has been commercialized as something that people can enjoy.

In addition, recently, FM
There are devices on the market that are equipped with a stereo oscillator and allow you to enjoy music in the same way as above.

[Problem that the invention seeks to solve]

However, the above-mentioned conventional technology does not take into consideration the point of transmitting the voice of the person handling the device, and furthermore, there is a problem that the effective reception range is too small.

The object of the present invention is to provide audio recordings of the Ministry of Handling, either alone or on a CD.
Another object of the present invention is to provide a radio cassette tape recorder with a built-in FM stereo oscillator that can simultaneously transmit a reproduced signal from a tape or the like and has a relatively large effective reception range.

[Means for solving problems]

The above object is to provide a radio cassette tape recorder having a built-in FM stereo oscillator with microphone circuit means, connect the output side of the microphone circuit means to the input side of the FM stereo oscillator, and further provide a changeover switch means to record CD or The ability to selectively input reproduced signals from a tape or the like to the FM stereo oscillator is achieved by using a receiving rod antenna as a transmitting antenna for the output of the FM stereo oscillator.

[Effect]

If the output side of the microphone circuit means is connected to the input side of the FJf stereo excavator, and a switching switch is provided so that the playback signal from a CD or tape can be selectively input to the FM stereo oscillator, the device The operator's voice can be transmitted alone or simultaneously with the playback signal of a CD or tape. Furthermore, by using the receiving rod antenna as a transmitting antenna for the output of the FM stereo oscillator, a relatively large effective receiving range can be obtained.

〔Example〕

Hereinafter, the present invention will be explained using the drawings.

FIG. 1 is a block diagram showing the main parts of an embodiment of the present invention.

In the figure, 1 is a CD8 raw circuit, 2 is an a-bass filter, 3 is a tape recorder circuit, 4 is a microphone circuit, 5 is a changeover switch, 6 is a line out terminal, 7 is an FM stereo oscillator, and 8 is an antenna changeover switch. , 9 is a rod antenna, 1o is an FM tuner circuit, 11 and 12 are switches, and 13 is an m source.

In FIG. 1, a CD8 reproduction circuit 1 outputs a CD reproduction signal to a changeover switch 5 through a low-pass filter 2.

It should be noted that the a-pass filter 2 uses 44.44. t The sampling frequency mantissa of KIiz is to attenuate the sampling frequency mantissa so as not to adversely affect the UFM stereo oscillator 7 when the CD playback signal is oscillated by the FM stereo oscillator 7 as described in f. It is something. Further, as will be explained later, the tape recorder circuit 3 receives the playback signal from the CD playback circuit 1 or the FM chiny.
The output signal from the circuit 10 is recorded and played back.

The reproduction signal of this tape recorder circuit 3 is output to the changeover switch 5. In addition, the selector switch 5 has an F
The output signal of the M tuner circuit 10 is supplied.

The changeover switch 5 outputs the playback signal when the CD playback circuit 1 is in the playback state, the eye playback decoding when the tape recorder circuit 5 is in the playback state, and the FM tinina circuit 10 when it is in the operating state. At this time, the output signal is selected and supplied to the line out terminal 6 and the FM stereo oscillator 7.

The switch 12 is a switch for connecting the power supply 15 to either the FM stereo oscillator 7 or the FM tuner circuit 10. The switch 12 and the antenna selector switch 8 are synchronized as an FMM oscillation mode switch, and the movable contact of the switch 12 is an FM stereo oscillator 79111.
, the movable contact of the antenna selector switch 8 is also set to FM.
When the movable contact of the switch 12 is on the FM tuner circuit IQlll, the movable contact of the antenna changeover switch 8 is also on the FM tuner circuit @10 side. Furthermore, when the microphone terminal is inserted in the microphone circuit 4, the movable contact of the switch 11 is switched from the ground side to the line side. The output of the microphone circuit 4 is connected to an in/out terminal 6 and an FM stereo oscillator 7 without going through a changeover switch 5.

Now, the FMM vibration mode switch consisting of the antenna changeover switch 8 and the switch 12 is connected to the FM stereo excavator 79.
111 and power supply 13 to FM stereo generator 71CWe.
At the same time, the rod antenna 9 is connected to the output side of the FM stereo oscillator 7, and the CD41I) main circuit 1 is put into the playback state. It is input to the FM stereo oscillator 7, and is further output as FM@vL from the rod antenna 9 via the antenna changeover switch 8.Furthermore, when the tape recorder circuit 3 is put into the playback state, the tape playback The signal is output as an FMt wave.

In addition, in this embodiment, as described above, when the CD playback circuit 1 or the tape recorder circuit 3 is put into the playback state and the microphone terminal is inserted into the microphone circuit 4, the CD or tape playback signal is transmitted to the operator of the device. Sound will also be output to the outside as FMt waves.

On the other hand, when the FM generator mode switch consisting of the antenna changeover switch 8 and the switch 12 is set to the FMf tuner circuit 10 side, the power supply 13 is connected to the FM tuner circuit 10, so the FM tuner circuit 10 becomes operational, and the tuner The output signal of the circuit 10 is outputted from the line out filter 6 via the changeover switch 5.

As is clear from the above, in this example, F
When the Mt wave is output, the power of the FM tuner circuit 10 is turned off, so the oscillation frequency of the FM tuner circuit 10 does not interfere with the oscillation frequency of the FM stereo oscillator 7.

FIG. 2 is a block diagram showing an example of a circuit added to FIG. 1.

In this figure, the same reference numerals as in the WJ1 figure represent the same or equivalent parts. 14 is a recording changeover switch.

This recording changeover switch 14 and the changeover switch 5 in FIG.
It is synchronized as a function switch, and the possible IO contact of the changeover switch 5 or the CD Tan sensei circuit 19411
In some cases, the movable contact of the recording selector switch 14 is
The CD playback signal can be recorded onto tape. In addition, the movable contact of the changeover switch 5 is F.
When it is on the M tuner circuit 10 side, the movable contact of the recording changeover switch 14 is at the position tIt indicated by the broken line, so that the output signal of the FM tuner circuit 10 can be recorded on tape. Note that when the movable contact of the changeover switch 5 is located at the position of the tape recorder circuit 3, the movable contact of the recording changeover switch 14 is positioned midway between the solid and broken lines. Become.

Figure 1 above and I! As is clear from the configuration in Figure 2,
In this embodiment, when the FM generator mode switch FM stereo generator 7 consisting of the antenna changeover switch 8 and the switch 12 is set, the CD playback circuit 1 is set to the playback state and the tape recorder circuit 5 is set to the recording state at the same time. ,
While recording the CD playback signal on a tape, the playback signal can be output as FM radio waves. Note that, as described above, the voice of the device handling agency can also be output as FM radio waves at the same time.

In addition, if the FM% vibration mode switch consisting of the antenna changeover switch 8 and switch 12 is set to the state shown in Fig. 1, and the changeover switch 5 is set to the FM tuner circuit 109111, only the audio of the handling unit can be set as FM'tIL7f< It is also clear that it can be output.

In this embodiment, it is arranged that the oscillation frequency of the FM stereo oscillator 7 is interfered with by the recording/playback bias oscillation frequency of the tape recorder circuit 3. However, such a situation can be resolved by electromagnetically shielding the recording/playback bias oscillator circuit and the FM stereo oscillator 7 inside the tape recorder circuit 5. Also, CD8
Digital noise in the raw circuit 1 also has an adverse effect on the FM stereo oscillator 7, but this is also attenuated within the CD playback circuit 1 by known appropriate means, and further prevented by electromagnetic shielding of the FM stereo oscillator 7 as described above. can do.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, the voice of the operator of the device can be transmitted alone or simultaneously with the playback signal of a CD or tape, etc., and the receiving rod antenna can be connected to the transmitting rod antenna. Since it can be used as a trap, the effective reception range is also relatively large.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the tL section of an embodiment of the present invention,
FIG. 2 is a block diagram showing an example of a circuit added to the first diagram. 1...CD playback circuit 2...a-pass filter 3...tape recorder circuit 4...microphone circuit 5...
・Selector switch 6...Line out terminal 7...
・FM stereo oscillator 8...Antenna changeover switch 9...Rod antenna 10...FM tuner circuit 11, 12...Switch 15...Power supply 1
4...Recording switch

Claims (1)

[Claims] 1. In a radio cassette tape recorder incorporating an FM stereo oscillator having at least an FM tuner circuit, a receiving rod antenna, and a tape recorder circuit, when outputting FM radio waves, the receiving rod antenna is connected to the FM stereo oscillator.
an antenna switching means for switching from a connection state with a tuner circuit to a connection state to an output side of the FM stereo oscillator so that the antenna is used as a transmitting antenna; and by inserting a microphone terminal, the output side of the microphone is connected to the FM stereo oscillator. A radio cassette tape recorder with a built-in FM stereo oscillator, characterized by comprising: a microphone circuit means connected to the input side of the FM stereo oscillator. 2. Claim 1, characterized in that when the FM radio wave is output, the power of the FM tuner circuit is turned off.
A radio cassette tape recorder with a built-in FM stereo oscillator as described in Section 1. 3. A built-in FM stereo oscillator according to claim 1 or 2, wherein the output side of the tape recorder circuit is connected to the input side of the FM stereo oscillator via a switch means. Radio cassette tape recorder. 4. The switch means is a changeover switch means, and the output playback signal of the tape recorder circuit and the output playback signal of the CD playback circuit are switched and supplied to the input side of the FM stereo oscillator. A radio cassette tape recorder having a built-in FM stereo oscillator according to item 3.