JPH10313256A - Medium wave radio receiver - Google Patents

Abstract

(57) [Summary] [Problem] In the back of a room such as a reinforced concrete house, the reception condition of a commercially available medium wave radio receiver (AM radio) deteriorates. An antenna 1 is attached to a glass part to which external light is introduced, and captures radio waves of a medium-wave radio formed by winding an insulated conductor around a coil winding made of a transparent resin plate, and an antenna. A receiver circuit unit 2 integrated with and attached to a part of the receiver, configured to obtain a demodulated voice based on the captured radio wave and emit infrared light modulated by the demodulated voice; and And a first portion 8 including at least a radiator and an infrared radiator section 3 and a demodulated voice based on the radiated infrared radiation to sound a speaker 7 or one of a headphone and an earphone. A second portion 9 comprising an infrared receiver and an audio demodulator section 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a medium-wave radio receiver, and more particularly to a medium-wave radio receiver capable of listening to a medium-wave radio broadcast without noise even in the back of a room where reception conditions are poor. Wave radio receiver.

[0002]

2. Description of the Related Art In a reinforced concrete house, a radio wave is shielded by a reinforcing bar embedded in concrete, and the receiving sensitivity of a medium-wave radio receiver having a built-in loop antenna or stick antenna becomes worse as the distance from the window increases. Is often experienced. Therefore, a dedicated loop antenna or stick antenna has been installed near the window, and the antenna line has been routed to the place where the receiver is located.

[0003]

However, in the above-described method, the antenna is installed near the window, and the antenna is routed from there to the medium-wave radio receiver. Was impaired.

In order to increase the receiving sensitivity, for example,
Assuming that a large loop antenna of about 50 cm square is used, there is a problem that it cannot be installed near the window or that the lighting of the room is poor because it is installed even if there is a place. Almost no antenna is installed near the window and the antenna line is routed to the receiver.

[0005] An object of the present invention is to listen to medium-frequency radio broadcasting in the back of a room in a reinforced concrete house or the like. It is an object of the present invention to provide a medium-wave radio receiver that can perform good reception even when it becomes worse.

[0006]

In order to achieve the above object, the present invention provides a medium wave radio receiver which is mounted on a glass part for introducing external light, and is provided with an insulated conductor on a coil winding frame made of a transparent resin plate. And an antenna for capturing a radio wave of a medium-wave radio formed by winding the antenna. The antenna is integrated with and attached to a part of the antenna, and a demodulated voice is obtained based on the captured radio wave to obtain the demodulated voice. A first portion comprising at least a receiver circuit portion configured to radiate infrared light modulated by the infrared ray modulator and an infrared radiator portion; and a demodulated sound based on the radiated infrared light. And a second portion comprising an infrared receiver and an audio demodulator unit configured to sound any of a speaker or headphones and earphones. It is intended.

In the medium wave radio receiver according to the present invention, the receiver circuit section, the infrared modulator and the infrared radiator section each include at least a tuner, an intermediate frequency amplifier, a voice demodulator, an infrared modulator and an infrared radiator. It is characterized by including.

Further, the medium wave radio receiver according to the present invention is characterized in that the tuner is controlled by remote control by infrared transmission.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on embodiments of the present invention with reference to the accompanying drawings. FIG.
Shows an embodiment of the medium wave radio receiver of the present invention. In FIG. 1, reference numeral 1 denotes, for example, an antenna for a medium-wave radio frequency band attached to a window glass.
In order to increase the receiving sensitivity, it is preferable to use an antenna having as large an aperture surface as possible, and therefore a large antenna.
Reference numeral 2 denotes a so-called receiver circuit unit that receives a supply of a received signal captured by the antenna 1 and outputs demodulated sound, and includes a tuner (RF stage) and an intermediate frequency amplifier (IF stage) as usual. And an audio demodulator.

In FIG. 1, reference numeral 3 designates a demodulated voice supplied from the receiver circuit section 2, which modulates the amplitude or frequency (AM or FM) of the infrared ray as a carrier wave with the demodulated voice, and further modulates the modulated infrared ray. An infrared modulator and an infrared radiator for emitting light, which are unique to the present invention. This infrared modulator and infrared radiator section 3
The infrared radiation radiated from the infrared receiver is received by an infrared receiver and an audio demodulator unit 4 placed away from a window, for example, in an adjacent room, and a demodulated voice is extracted from the received infrared light.

The above-mentioned receiver circuit section 2 may be configured so that a reception frequency can be selected (tuned) by an infrared remote controller 5 by infrared transmission. Reference numeral 6 denotes an infrared light receiver, a channel selection, and a power on / off control unit necessary for that. In addition, the controller unit 6 may be capable of controlling the power on / off of the receiver circuit unit 2, the infrared modulator, and the infrared radiator unit 3 (that is, by the infrared remote controller 5). The power can be turned on and off.)

On the other hand, the infrared receiver and the audio demodulator unit 4
The infrared light received at the above is demodulated in amplitude or frequency according to the type of modulation of the infrared light in the infrared modulator and the infrared radiator section 3 and sounds the speaker 7 (which may be replaced with either a headphone or an earphone). Can be. In FIG. 1, portions 8 and 9 surrounded by alternate long and short dash lines indicate portions corresponding to the first portion and the second portion referred to in the claims and claim 1, respectively. ing.

Next, the antenna used in the medium wave radio receiver of the present invention will be described. FIG. 2 shows an example of the structure of an antenna (indicated by reference numeral 1 in FIG. 1) used in the medium-wave radio receiver of the present invention, in the order of the assembling steps (a) and (b). In this example, three transparent acrylic plates, each shown in a plan view in FIG. 2A, are bonded in this order, and the obtained one is used as a coil winding frame, and the groove portion (others) is used. An insulated conducting wire such as an enamel wire is wound around a portion of the transparent acrylic plate which is one size smaller than that of the transparent acrylic plate (see FIG. 2B shown in a side view) to form a loop antenna.

The reason why the transparent acrylic plate is used as a coil winding frame is that it is not necessarily a transparent acrylic plate because it does not block external light even when it is attached to a window glass using a suction cup or the like. However, any lightweight transparent resin plate may be used.

A part of the loop antenna thus obtained (for example, the lower left corner of the coil winding) is provided with a receiver circuit section 2, an infrared modulator and an infrared radiator section 3 shown in FIG. It is assumed that the part including the light receiving device, the tuning and the power on / off control unit 6 is integrally mounted. If the medium-wave radio receiver of the present invention is mass-produced, the whole receiver can be integrated into an IC. This makes it easier to attach this part to the antenna.

Finally, in the medium-wave radio receiver of the present invention, when the modulation by voice is frequency modulation (FM),
To transmit the infrared light modulated by voice from the first portion (the portion indicated by reference numeral 8 in FIG. 1) to the second portion (the portion indicated by reference numeral 9 in FIG. 1), It has been confirmed by experiments that the second portion is sufficiently practical if the distance between them is 9 m, and the angle between the first portion and the second portion is ± 10 degrees as viewed from the first portion as the infrared receiving range. Note that this experiment was performed using infrared light having a wavelength of 850 nm.

[0017]

According to the medium-wave radio receiver of the present invention, in a reinforced concrete house or the like, even in the back of a room where the medium-wave radio broadcast cannot be satisfactorily received, as long as it is within a range where infrared rays can reach. Reception becomes possible.

In the receiver of the present invention, since the antenna is formed using the transparent resin plate, the room does not become dark even if the antenna is mounted on the window glass.

[Brief description of the drawings]

FIG. 1 shows an embodiment of a medium-wave radio receiver of the present invention.

FIG. 2 shows the structure of an example of an antenna used in the medium-wave radio receiver of the present invention in the order of its assembling process.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Antenna 2 Receiver circuit part 3 Infrared modulator and infrared radiator part 4 Infrared light receiver and audio demodulator part 5 Infrared remote controller 6 Infrared light receiver and tuning, power on / off control part 7 Speaker 8 First part 9 Second part

Claims (3)

[Claims] 1. An antenna attached to a glass portion for introducing external light, for capturing a radio wave of a medium-wave radio formed by winding an insulated conductor around a coil frame made of a transparent resin plate. A receiver circuit unit integrated with and attached to a part of the antenna, configured to obtain demodulated voice based on the captured radio wave and to emit infrared light modulated by the demodulated voice; and infrared modulation. A first portion comprising at least a vessel and an infrared radiator section;
A second part including an infrared receiver and an audio demodulator unit configured to obtain a demodulated voice based on the radiated infrared rays and to sound any of a speaker, a headphone, and an earphone. Medium wave radio receiver. 2. The medium-wave radio receiver according to claim 1, wherein the receiver circuit section, the infrared modulator and the infrared radiator section include at least a tuner, an intermediate frequency amplifier,
A medium-wave radio receiver comprising an audio demodulator, an infrared modulator and an infrared radiator. 3. The medium-wave radio receiver according to claim 2, wherein the tuner is controlled by remote control by infrared transmission.