CN1816942A

CN1816942A - An apparatus for radio reception

Info

Publication number: CN1816942A
Application number: CNA2004800189959A
Authority: CN
Inventors: C·-G·布洛姆
Original assignee: POELOS AB
Current assignee: POELOS AB; Perlos AB
Priority date: 2003-07-04
Filing date: 2004-06-23
Publication date: 2006-08-09
Also published as: SE0301986D0; SE525484C2; SE0301986L; WO2005004279A1

Abstract

The disclosure relates to an apparatus for receiving AM radio in a mobile telephone. The mobile telephone has an antenna unit (6) which is connectable to circuits for AM reception via an impedance converter, as well as a handsfree unit (2). The antenna unit (6) has an electrically conductive, elongate and flexible element (9) which has one or more metal wires. The flexible element (9) is electrically insulated from but mechanically connected to and partly supported by a lead (4) included in a handsfree unit (2). The included lead (4) is also connected to an earplug (5) or microphone.

Description

The equipment that is used for radio reception

Technical field

The present invention relates to be used for receive AM radio broadcasting (radio) and comprise the equipment that can be connected to the antenna of the circuit that is used for the AM reception via impedance transformer at mobile terminal unit such as honeycomb or mobile phone, this mobile phone shows the hands-free device with hands-free unit.

Background technology

The radio broadcasting of amplitude modulation is that the AM radio broadcasting is launched in 0.5 to 1.6MHz frequency range usually.The relative low frequency that adopts in the AM radio broadcasting makes that the antenna that is used to receive the AM radio broadcasting when adopting prior art will be heavy.

Known in the art in the past: as in the AM radio broadcasting, to use so-called ferrite antenna, dispose one or more coils in the above with ferrite core.Such antenna is heavy, but has the external measurement of relative compact.Yet if use this antenna in mobile unit, the major defect of such antenna is the obvious orientation that antenna presents.

In the design and structure of modern honeycomb or mobile phone, people attempt difference in functionality as much as possible is integrated in the same equipment.By in mobile phone, comprise be used for circuit that AM receives might be when mobile phone comprises the possibility of listening to the AM radio broadcasting, this is an advantage.Such circuit then is used for driving the standard loudspeakers of mobile phone or has the hands-free device of the earplug that is connected to mobile phone.

Above-mentioned ferrite antenna is owing to its orientation and considerable weight thereof are not suitable for using in mobile phone or being not suitable for using with mobile phone.Other traditional AM antenna is because its large scale and defective.

In mobile phone or use the AM receiver in its vicinity and another problem of causing is the following fact: amplitude modulation is extremely responsive for the external interfering noise in the frequency range of AM radio broadcasting.Noise in this frequency range be because some parts such as the transformer that comprises in the mobile phone, be used for display driver element and generate significantly.

Therefore external noise is superimposed in amplitude modulation, and will identical mode be exaggerated with the radio signal of listening to intention.

Summary of the invention

The objective of the invention is to design the described equipment of a kind of foreword, so that it eliminates intrinsic problem in the prior art.Especially, the objective of the invention is to design this equipment, making it in light weight, and only need a spot of space, and can make with low cost.An also purpose of the present invention is this equipment of design, to make it the eliminating interference problem that can reckon with as far as possible.

If the described equipment of foreword is characterised in that, antenna element comprises conduction, elongated and flexible member, then will realize constituting the purpose on basis of the present invention, wherein this element be used for lead (lead) electric insulation of the hands-free unit of earphone receiver/earplug or microphone, but be mechanically connected to this lead at least and supported by this lead at least in part.

Description of drawings

Now, below the present invention will be described in greater detail with reference to the attached drawings.In the accompanying drawings:

Fig. 1 has schematically shown honeycomb or the mobile phone that is equipped with the hands-free device with two earplugs;

Fig. 2 has shown mobile phone and the hands-free device of Fig. 1, but has augmented the equipment that is used to receive the AM radio broadcasting;

Fig. 3 has shown the hands-free device of Fig. 2 and disposed thereon antenna element with big scale;

Fig. 4 is the concrete schematic diagram that is connected shown in Figure 3 between antenna element and hands-free device; With

Fig. 5 is the sketch of the impedance transformer that adopts in theme of the present invention.

Embodiment

In Fig. 1, label 1 relates to portable terminal unit, such as honeycomb or mobile phone.Mobile phone 1 connects 3 via lead and is connected to hands-free device, and in the embodiment shown, this hands-free device comprises hands-free unit 2 that has action button and two earplugs 5 that are connected to hands-free unit 2 via lead 4.Except earplug 5, hands-free unit 2 can also be connected to microphone.The modification that hands-free device has single earplug 5 also is known.

Described with regard to mobile phone and the hands-free device with regard to top, they can be considered to conventional.

In Fig. 2, mobile phone shown in Figure 1 and hands-free device have been equipped with the equipment that is used to receive the AM radio broadcasting.Thereby, comprise in mobile phone 1 being used for the circuit that AM receives that these circuit are connected to the impedance transformer that is integrated in the hands-free unit 2 via second lead 7 between mobile phone 1 and the hands-free unit 2.In addition, hands-free unit 2 has the input 8 that connects antenna element 6.This antenna element comprises at least one conduction, elongated and flexible member 9, this element 9 and be configured in hands-free unit 2 and earplug 5 between lead 4 electric insulations but be mechanically connected to this lead 4 and utilize this lead 4 to support at least in part.

Antenna element 6 is designed to the T type, and wherein the intersection of T type (cross) is connected to two leads 4 that extend to earplug 5 from hands-free unit 2 on its opposite end, and utilizes these two leads 4 to support at least in part.The bottom of T type (foot) is connected to the input 8 on the hands-free unit 2.Above-mentioned antenna element 6 is that the T type has wire antenna, and it has insulating element 10 on the opposite end of T-junction, and this has wire antenna to be mechanically connected to two leads 4 that extend to earplug 5 via these insulating elements 10, and is supported by these two leads 4 at least in part.Insulating element 10 can utilize plastics to make suitably, and can cooperate by this way with lead 4, and promptly these insulating elements 10 can be along the longitudinal direction displacement of these leads, and can fix with respect to these leads.

The wire antenna that has of above-mentioned T type design is that almost completely direction is independently.In addition, it presents the high impedance of several M Ω magnitudes.

Except the conventional element in the hands-free unit 2, such as be used to respond with the action button of terminating call, to microphone and earplug be connected and to lead connect 3 with being connected of mobile phone outside, also shown impedance transformer according to hands-free unit of the present invention, this impedance transformer is transformed into an impedance to the high output impedance of antenna element 6, and this impedance makes input impedance (having 50 to 200 Ω order of magnitude usually) and is arranged on the circuit that is used for the AM reception in the mobile phone and adapts.The sketch that in Fig. 5, has shown this impedance transformer.

In Fig. 5, this antenna element be given with other accompanying drawing in identical label, that is, and label 6.Antenna element 6 has the output impedance of several M Ω magnitudes.This means: the protection that certain form must be provided is with to anlistatig discharge.Such discharge prevention has label 11 in Fig. 5, and utilizes its terminal to be connected to ground 20 towards the direction away from antenna element 6.The power supply of antenna element 6 or excitation conductor (conductor) 12 is through the input 8 of hands-free unit 2, and process capacitor 13 arrives transistors 14.Two all the other terminals on this transistor are connected to resistance 17 via

conductor

15 and 16 and after this are connected respectively to the terminal and the tie point 23 of voltage source 18, but also are connected to ground 20 via resistance 19.Conductor 16 between transistor 14 and the ground 20 is branched in tie point 23, and is connected to terminal 22 via capacitor 21, and the lead 7 between hands-free unit 2 and the mobile phone 1 can be connected to this terminal 22.Tie point 23 on the conductor 16 between transistor 14 and the ground holds 25 via branch conductors 24, electrical equipment and is connected to transistor being connected to conductor 15 with resistance 26.Conductor 24 is connected to ground 20 via additional resistance 27 between electric capacity 25 and resistance 26.In addition, be connected to lead 12 between antenna and the transistor 14 via additional resistance 28 at the conductor 24 between capacitor 25 and the resistance 26.Voltage source conductor 15 between terminal 18 and resistance 17 is connected to ground via two

capacitors

29 and 30.

As described in foreword, in mobile phone, have some parts that in being generally used for launching the frequency range of AM radio broadcasting, generates powerful noise.This noise mainly is to generate owing to the transformer of mobile phone and the drive unit that is used for its display thereof.According to the present invention, or in impedance transformer or be used for the signal output that circuit configuration that AM receives is connected to switching device shifter, this switching device shifter again as follows the noise that disturbs of control generate the mode of operation in source (such as transformer and be used for the drive unit of display): receive when taking place at AM, these noises generated source deexcitations or these noise generation sources are switched (downswitch) down to stand-by state.

The description of alternative embodiment

In the above, antenna element 6 is described to the T type wire antenna, and it utilizes two leads to come machinery support at least in part, and wherein said two leads lead to earplug 5.Hands-free device only shows in the situation of an earplug therein, can not use such antenna arrangement.Under these circumstances, on the other hand, can adopt the straight wire antenna that has, suppose the size of determining impedance transformer with suitable manner, so that the approximate impedance that presents desired 50 to 200 Ω of input of the circuit that is used for the AM reception of its output.

Because antenna element 6 has little physical size, so it can only launch very weak signal.In order to compensate this, impedance transformer itself comprises as the antenna amplifier antennafire function and thereby arrives the amplifier that amplifies before being used for circuit that AM receives from the signal of antenna element 6 at the signal from antenna element 6 and connect.

According to the present invention, be arranged on impedance transformer in the mobile phone 1 suitably rather than be arranged on as mentioned above in the hands-free unit 2, this also may be possible purely physically.

According to the present invention, also might in hands-free unit 2, might be provided for the circuit that AM receives with the form of chip.The desired operating means of the use of AM receiver (platform is tuning etc. for on/off, volume) is arranged on the hands-free unit 2, and this also may be suitable.

Claims

1, a kind of equipment that is used in mobile terminal unit such as honeycomb or mobile phone reception AM radio broadcasting, and this equipment comprises antenna element (6), this antenna element can be connected to via impedance transformer and be used for the circuit that AM receives, this mobile phone shows the hands-free device with hands-free unit (2), it is characterized in that, this antenna element (6) comprises conduction, elongated and element flexibility (9), this element be included in lead (4) electric insulation that is used for earphone receiver/earplug or microphone in the hands-free unit (2), but be mechanically connected to this lead and utilize this lead to support at least in part.

2, equipment according to claim 1, further feature are that impedance transformer is configured in the hands-free unit (2).

3, equipment according to claim 2 is characterized in that, independent RF lead (7) is configured in the middle hands-free unit (2) of mobile phone (1) and is used between the circuit of AM reception.

4, according to the described equipment of each claim among the claim 1-3, it is characterized in that, conduction, elongatedly comprise one or more metal wire with element flexibility (9).

5, according to the described equipment of each claim among the claim 1-4, it is characterized in that, antenna element (6) is formed the thread T type of metal that utilizes, wherein the connection on the bottom of T type (8) is the RF power supply to hands-free unit (2), and the terminating blind (district) aspect electric of the opposite end part of T-junction, and be connected to lead (4) between hands-free unit (2) and two earphone receiver/earplugs (5) via insulating element (10).

According to the described equipment of each claim among the claim 1-5, it is characterized in that 6, the circuit that is used for the AM reception is set at mobile phone (1).

According to the described equipment of each claim among the claim 1-5, it is characterized in that 7, the circuit that is used for the AM reception is set at hands-free unit (2).

8, according to the described equipment of each claim among the claim 1-7, it is characterized in that, impedance transformer or be used for the circuit that AM receives and have signal output, interference in the frequency range that can deexcitation AM receives by the output of this signal generates parts or these is disturbed and generates parts incisions and change to stand-by state, and wherein these disturb and generate driver element and the transformer that is used for display in parts such as mobile phones (1).