JPS5885905A - tape recorder - Google Patents

Abstract

PURPOSE:To enable the hearing through another radio receiver with optional sound volume and sound quality, by modulating the reproduced signal and transmitting it as a radio wave. CONSTITUTION:In a reproduction mode, the reproduced signal sent from a head 2 is applied to a modulating circuit 7 via the recording/reproducing switches S1-2 and S1-1, amplifiers 5 and 6, and a connecting terminal for a headphone respectively. The reproduced signal of the circuit 7 is transmitted through an antenna which is connected to an antenna terminal 11 via a transmitting circuit 8. Therefore it is possible to receive the radio waves and to hear the modulated signal with a proper and optional output through another radio receiver by setting the transmitting frequency at the radio receiving frequency. Under such conditions, a mixing switch S2 is turned on and therefore the above-mentioned signal can be transmitted also through the circuit 8 in the form of a radio wave.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a small-sized tape recorder, and an object of the present invention is to provide an excellent tape recorder that has a simple configuration and can be used in a unique manner.

Generally, small tape recorders are subject to various restrictions on the size of the speakers that can be installed, so if the volume is too loud,
There is a problem that good sound quality cannot be obtained. On the other hand, tape recorders exclusively for headphones are also known, but this type of tape recorder can only be enjoyed by one person, and there are various restrictions on its use.

The present invention was made in view of the above-mentioned problems, and although the tape recorder itself is small, it can produce large volumes and
To provide an excellent tape recorder that can freely obtain good sound quality.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The tape recorder of the present invention will be described below with reference to drawings of one embodiment. In the figure, 1 is a built-in microphone, 2 is a recording/playback head, 3 is a bias oscillation circuit, and 4 is a built-in microphone.
is a microphone input amplifier circuit, 6 is a recording/playback amplifier circuit, 6 is an output amplifier circuit, 7 is a modulation circuit, 8 is a transmission circuit, 9 is a tape drive motor, 10 is a connection terminal for connecting headphones, 10'31 , - is a changeover switch that is switched in conjunction with connecting headphones to the connection terminal 1o, 11 is an antenna connection terminal, 12 is a power battery, 51-1 to 51-4 are recording and playback changeover switches, s2 is the mixing switch, s
s-+, 53-2 is a power switch that is turned on when the playback button is pressed.

In the above embodiment, the recording/playback selector switches 51-1 to 51-5
1-4 to the playback side terminal P as shown in the figure, press the playback button, and turn on the power switches ``35-1'' and 55-2, the voltage from the power source battery 12 will change to the power switch 85-. 1.Amplification circuit 5 for recording and playback via 85-2
．． Output amplification circuit 6. Applied to the tape drive motor e,
When all of these become operational, the power switch SS
-+, recording/playback selector switch s, -4, selector switch 1
The voltage of the power supply battery 12 is also applied to the modulation circuit 7 and the transmission circuit 8 via the terminal 0', and both of them become operational at the same time. Therefore, the head 2 reproduces the signal recorded on the tape, and its output is transmitted to the recording/reproduction selector switches s, -2, s, -1, the amplifier circuits 6, 6, . The signal is applied to the modulation circuit 7 via the connection terminal 1o for headphone connection. Therefore, it is played by head 2,
The signals amplified by the amplifier circuits 5 and 6 will be modulated by the modulation circuit 7, and will be transmitted as radio waves from the antenna connected to the antenna connection terminal 11 via the transmission circuit 8. Therefore, if the transmission frequency is set to the radio reception frequency at this moment, the radio waves can be received by another radio receiver and the signal can be listened to at any suitable output.

If the mixing switch S2 is turned on in this state, the voltage of the power supply battery 12 is also applied to the microphone input amplification circuit 4 via the mixing switch S2, so that the signal from the microphone 1 is also input to the microphone input amplification circuit. The signal is applied to the recording/playback amplifier circuit 6 via the circuit 4, and is transmitted as a radio wave by the transmitting circuit 8 in the same way as the signal from the head 2.

Furthermore, if headphones are connected to the headphone connection terminal 1° in this state, the modulation circuit 7. The power supply to the transmitting circuit 8 is cut off, and at the same time, the output end of the output amplifier circuit 6 is disconnected from the input end of the modulation circuit 7.

Therefore, in this state, the modulation circuit 7. The transmitting circuit 8 becomes inactive, and the output of the output amplifying circuit 6 is applied exclusively to the headphone connected to the headphone connection terminal 10.

Next, a case where the recording/reproduction changeover switches 51-1 to 51-4 are connected to the recording side terminal H will be explained.

In this case, a signal from the microphone 1 is applied to the head 2 via the amplifier circuit 6, and the recording becomes possible. In this case, the bias oscillation circuit 3 is activated and its output is applied to the head 2 at the same time. Furthermore, since the output of the amplifier circuit 6 is further applied to the headphone connection terminal "1o" via the output amplification circuit 6, when a headphone is connected to the headphone connection terminal 10, the microphone 1 is connected to the headphone by the headphone. When no headphones are connected to the headphone connection terminal 10, the output of the output amplifier circuit 6 is applied to the input terminal of the modulation circuit γ. Since the voltage of the power supply battery 12 is not applied to either the modulation circuit 7 or the transmission circuit 8 by the action of the recording/playback selector switch 51-4, both the modulation circuit 7 and the transmission circuit 8 are in a non-operating state, and therefore, as a radio wave. It will never be sent.

As is clear from the above embodiments, according to the tape recorder of this invention, the signal reproduced by the head is modulated,
It can be transmitted as radio waves.

Therefore, it has the advantage that it can be listened to at any volume and sound quality using another radio receiver.

In the embodiment, the modulation circuit 7. The transmitting circuit 8 is configured to operate only during playback, but during recording.

It is also possible to enable operation during playback.

[Brief explanation of the drawing]

The figure is a schematic electrical connection diagram of an embodiment of the tape recorder of the present invention. 1...Microphone, 2...Head,
3...Par7benoia oscillator circuit, 4...Microphone input amplification circuit,
6゜6...Amplification circuit, 7...Modulation circuit, 8...Transmission circuit, 9...Motor, 1
o...Headphone connection terminal, 11...-
・Antenna connection terminal, 12...Power battery, 51
-1~81-4...Recording/playback selector switch, S
2. Medium/Bex/G switch, 53-1, 83-
2...--Power switch. Name of agent: Patent attorney Satoshi Nakao and one other person? 8 Kaisho 58-85905 (3)

Claims (1)

[Claims] (1) An amplifier circuit that amplifies the signal reproduced by the reproduction head, a modulation circuit that modulates the signal amplified by this amplifier circuit, and a transmission circuit that transmits the signal modulated by this modulation circuit as radio waves. A tape recorder. @) It has a headphone connection terminal, and only when no headphone is connected to this headphone connection terminal, power is applied to the modulation circuit and the transmission circuit, and the signal reproduced by the playback head and amplified by the amplifier circuit is transmitted to the modulation circuit. A tape recorder according to claim 1, which is configured to be modulated by a transmitting circuit and transmitted as a radio wave by a transmitting circuit.