JP2003169007A - Receiving device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a receiving device whose reception performance can be improved by a space diversity system using a plurality of antennas without making the device large-sized. <P>SOLUTION: The device is equipped with an antenna switching circuit 2 which performs space diversity by adaptively switching or mixing antenna output signals inputted from audio signal output terminals J1a and J1b and a reception part 3 which performs reception processing by using the output signal of the antenna switching circuit 2. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a receiver for receiving a radio signal by a space diversity system using a plurality of antennas.

[0002]

2. Description of the Related Art In recent years, portable television receivers and F
2. Description of the Related Art Receiving devices such as M radio have become popular because they can be used while moving on a train or bus, such as during commuting. In such a receiving device used while moving, it is necessary to take measures against fading during reception in order to prevent transmission errors. Conventionally, there is known a space diversity method in which a plurality of antennas are arranged as a measure against fading and outputs of the respective antennas are adaptively switched or combined. Then, a receiving apparatus with improved reception performance is realized by performing reception processing by this space diversity method.

[0003]

However, the conventional receiving device has a problem that it is not suitable for portable use because the receiving device becomes large because it has a plurality of antennas. Therefore, there is a method of providing an external antenna as necessary, but it is necessary to provide a terminal for connecting the external antenna separately, which may hinder the miniaturization of the portable receiving device. Also, with the external antenna attached, it will still be large to carry. In addition, it may be troublesome for a user to carry an external antenna.

The present invention has been made in consideration of such circumstances, and an object thereof is to improve the receiving performance by a space diversity system using a plurality of antennas without inviting an increase in the size of the device. The object is to provide a receiving device that can do so.

Another object of the present invention is to provide a space diversity type receiver which can eliminate the trouble of carrying an external antenna.

[0006]

In order to solve the above problems, the present invention adaptively switches or combines antenna output signals input from at least two terminals used for inputting or outputting a voice signal. It is characterized by comprising an antenna switching circuit for performing space diversity and reception processing means for performing reception processing using an output signal of the antenna switching circuit. According to the present invention, at least two terminals used for inputting or outputting a voice signal are also used as input terminals for an antenna output signal.
This eliminates the need to equip the receiving device with a plurality of antennas or to separately provide an external antenna connection terminal in order to use a plurality of antennas for space diversity. As a result, the reception performance can be improved by the space diversity method using a plurality of antennas without increasing the size of the device.

Further, since a device for voice output or voice input such as headphones or a headphone with a microphone which is originally used in the receiving device or a device equipped with the receiving device is used as an antenna, the user can use an external antenna There is no need to carry around separately. As a result, the trouble of carrying an external antenna can be eliminated.

The present invention further comprises a first filter which passes a signal in a frequency band of the antenna output signal and cuts off a signal in a frequency band including at least a voice signal, wherein the antenna output signal is It is characterized in that the signal passes through the first filter and is input to the antenna switching circuit. According to the present invention, at least the audio signal is removed from the antenna output signal input to the antenna switching circuit. As a result, the antenna switching circuit can use the signal from which the audio signal that may be low frequency noise is removed, as the antenna output signal. As a result, it becomes possible to perform space diversity more accurately, and the reception performance is further improved.

The present invention further includes a second filter which passes a signal in a frequency band including a voice signal and cuts off at least a signal in a frequency band of the antenna output signal, and outputs the signal from each of the terminals. The audio signal is input to each of the terminals after being passed through the second filter. According to the present invention, at least the signal in the frequency band of the antenna output signal is removed from the audio signal input to each terminal. As a result, it is possible to prevent the antenna output signal input from each terminal from being superposed with a signal in the frequency band of the antenna output signal that may be noise in the spatial diversity processing. As a result, it is possible to more accurately perform space diversity and further improve the reception performance.

[0010]

DETAILED DESCRIPTION OF THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a receiving system using a receiving device 1 according to the first embodiment of the present invention. The receiving system shown in FIG. 1 is
In the television image receiving system including the receiving device 1 and the headphones 20, the receiving device 1 has a television image receiving function. In FIG. 1, a receiver 1 includes an antenna switching circuit 2 and a receiver 3 having a television image receiving function.
It is composed of two low pass filters (LPF) 4, two high pass filters (HPF) 5, and a headphone connection terminal J1. The receiving unit 3 includes a television tuner 11, a video circuit 12, and an audio circuit 13. The headphone connection terminal portion J1 includes audio signal output terminals J1a and J1b and a GND signal terminal J1c.

The headphone 20 has two speakers 21.
And two signal lines A1 and A2 connected to each speaker 21 for transmitting and inputting audio signals, and each speaker 21
It is composed of a GND signal line G1 connected to the headphone connection terminal portion J1 of the receiving device 1 and a plug (not shown) for connecting to the headphone connection terminal portion J1 of the receiving device 1. The signal lines A1 and A2 are respectively connected to the audio signal output terminals J1a and J1b of the headphone connection terminal J1 via the plugs. The GND signal line G1 is connected to the GND signal terminal J1c of the headphone connection terminal portion J1 via a plug. In the receiving device 1, the GND signal line G1 ′ is connected to the GND signal terminal J1c.
Are connected, and the GND signal line G1 'is grounded.

In the receiving system shown in FIG. 1, the two signal lines A1 and A2 of the headphone 20 are used as antennas, respectively, whereby two space-diversity type two signal lines A1 and A2 are used. Configure the antenna. The outputs (antenna output signals) of the two antennas composed of the signal lines A1 and A2 are input to the receiving device 1 via the audio signal output terminals J1a and J1b, respectively.
The signal is input to the HPF 5 through the signal lines A1 'and A2'. The HPF 5 passes a high frequency television signal and blocks a signal in a frequency band including at least an audio signal. As a result, 2 which passed HPF5
The one antenna output signal becomes a signal from which a voice signal which may be low frequency noise is removed, and is input to the antenna switching circuit 2.

The antenna switching circuit 2 adaptively switches or combines the two input antenna output signals to perform space diversity. The two antenna output signals are selected or combined by the antenna switching circuit 2 and input to the tuner 11. The tuner 11 performs television tuning using the input signal, and outputs the tuned signal to the video circuit 12. Video circuit 1
2 restores a video signal using the video portion of this input signal and outputs it to a display (not shown). Further, the input signal is output to the audio circuit 13.

The audio circuit 13 restores the audio signals of two channels by using the audio part of the input signal received from the video circuit 12, and outputs them to each LPF 4. The audio circuit 13 outputs the same audio signal to each LPF 4 when the content of the audio signal included in the input signal is the audio for one channel (monaural audio).

The LPF 4 passes a signal in a frequency band including a voice signal and cuts off a signal in a television signal frequency band which may be at least noise in space diversity processing. As a result, the signal lines A1 ′, A
It is prevented that a signal which may be noise in the space diversity processing of the antenna switching circuit 2 is output onto the 2 '. LP
The two audio signals that have passed through F4 are signal lines A1 ', A
2'and the audio signal output terminals J1a and J1b are output to the headphones 20 and are output as audio from each speaker 21.

As described above, the two audio output terminals are also used as the input terminals of the antenna output signals of the two antennas of the space diversity system, and the two antenna output signals are adaptively switched or combined. Since it is equipped with an antenna switching circuit that performs space diversity, in order to use multiple antennas for space diversity,
Since it is not necessary to provide the receiving device with a plurality of antennas or separately provide an external antenna connection terminal, the size of the device is not increased. As a result, it is possible to improve the reception performance by the space diversity method while realizing the miniaturization as a portable reception device.

Further, since the headphone originally used in the receiving device or the device equipped with the receiving device is used as the antenna, the user does not need to carry an external antenna separately. As a result, it is possible to eliminate the trouble of carrying an external antenna.

Further, an antenna output signal input from the two audio output terminals passes a signal in the antenna output signal frequency band (television signal frequency band) and is a signal in a frequency band including at least an audio signal. Since it is configured to be input to the antenna switching circuit through a first filter (for example, a high-pass filter) that cuts off
At least the audio signal is removed from the antenna output signal input to the antenna switching circuit. As a result, the antenna switching circuit can use a signal from which a voice signal, which may be low-frequency noise is removed, as an antenna output signal. It is possible to obtain the effect of further improving.

Further, an audio signal output from the two audio output terminals passes a signal in a frequency band including the audio signal and at least a signal in an antenna output signal frequency band (television signal frequency band). After passing through a second filter (for example, a low-pass filter) that cuts off, it is input to the respective audio output terminals. As a result, at least the signal in the frequency band of the antenna output signal is removed from the audio signal input to each terminal, and the antenna output signal input from the two audio output terminals is affected by noise in the space diversity processing. It is possible to prevent a signal in the frequency band of the output signal of the antenna, which may be a signal, from being superimposed. As a result, there is an effect that the space diversity can be performed more accurately and the reception performance can be further improved.

The receiving device 1 may be provided with a display for displaying the video signal output from the video circuit 12, or may be configured to be connectable to an external display.

FIG. 2 is a block diagram showing the configuration of the receiving apparatus 100 according to the second embodiment of the present invention. This Figure 2
In FIG. 1, parts corresponding to those in FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted. Receiving device 100 shown in FIG.
In FIG. 1, the antenna switching circuit 2, the receiving unit 3, L
A portion including the PF 4 and the HPF 5 is shown as a receiving main body portion and includes a plurality of receiving main body portions 101-1 to 10-N. In addition, a plurality of headphone connection terminal portions J1 and J2 to JN connected to the respective reception main body portions 101-1 to 10 to N are provided.

Each of the receiving sections 3-1 and 2 to 3 of the receiving main body sections 101-1 to 101-N has a television image receiving function or FM.
It has any of various receiving functions such as a radio receiving function, a mobile phone receiving function, and a data receiving function in wireless data communication. Further, each of the receiving units 3-1 and 2 to 3 -N may have the same receiving function, or may have different receiving functions. As a result, broadcast programs such as TV broadcasts and FM radio broadcasts,
It is possible to accurately perform reception related to data communication such as a mobile phone and an electronic mail by the same receiving device by the space diversity method.

In the above embodiment, the space diversity is performed by using two antennas, but it may be performed by using three or more antennas.
For example, three or more antenna output signals are input using the audio signal output terminals J1a, J1b, J2a, J2b of the headphone connection terminal portions J1, J2 shown in FIG. 2, and these three or more antenna output signals are input. May be used in one receiving body. In this case, the antenna switching circuit adaptively switches or combines the three or more input antenna output signals to perform space diversity.

Further, the input terminals for the plurality of antenna output signals are not limited to the above-mentioned audio signal output terminals of the headphones, but may be the audio signal output terminals of the plurality of earphones.

The input terminals for the plurality of antenna output signals may be not only audio signal output terminals but also audio input terminals. As a result, a headphone with a microphone or an earphone with a microphone can constitute a spatial diversity type reception system.
This is particularly useful when using a mobile phone.

The receiving device of the present invention may be configured as a single device by itself, or may be provided in another device. For example, PDA (Pe
rsonal Digital Assistants: personal information devices) and the like may be included in mobile terminals.

Further, in the above-described embodiment, the audio signal output terminal for outputting the audio signal received by the spatial diversity is used also as the input terminal of the antenna output signal, but another audio output terminal is used. You may use it. For example, when a reproducing device for reproducing music recorded on a recording medium is equipped with the receiving device according to the present invention for data communication, the audio signal output terminal for reproducing the music is connected to the antenna output signal. Also used as the input terminal of.

Although the embodiment of the present invention has been described in detail above with reference to the drawings, the specific structure is not limited to this embodiment, and design changes and the like within the scope not departing from the gist of the present invention. included.

[0029]

As described above, according to the present invention,
Since at least two terminals used for inputting or outputting audio signals are also used as input terminals for antenna output signals, the receiving device is equipped with a plurality of antennas in order to use a plurality of antennas for spatial diversity. In addition, there is no need to separately provide an external antenna connection terminal, and the device does not become large. This allows
It is possible to obtain the effect that the reception performance can be improved by the space diversity method while realizing the miniaturization as the portable reception device.

Furthermore, since a device for voice output or voice input such as headphones or a headphone with a microphone that is originally used in the receiving device or a device equipped with the receiving device is used as an antenna, the user can use an external antenna. There is no need to carry around separately. As a result, it is possible to eliminate the trouble of carrying an external antenna.

Further, a first filter for passing a signal in the frequency band of the antenna output signal and for blocking a signal in the frequency band including at least a voice signal is provided, and the antenna output signal is passed through the first filter. If the input signal is input to the antenna switching circuit, at least the audio signal is removed from the antenna output signal input to the antenna switching circuit. As a result, the antenna switching circuit can use the signal from which the audio signal that may be low frequency noise is removed, as the antenna output signal. As a result, it becomes possible to perform the space diversity more accurately, and the effect that the reception performance is further improved is obtained.

Further, a second filter for passing a signal in the frequency band including the audio signal and blocking at least a signal in the frequency band of the antenna output signal is provided, and the audio signal to be output from each terminal is the second filter. If the signal is input to the terminals after passing through the filter, at least the signal in the frequency band of the antenna output signal is removed from the audio signal input to the terminals. As a result, it is possible to prevent the antenna output signal input from each terminal from being superposed with a signal in the frequency band of the antenna output signal that may be noise in the spatial diversity processing. As a result, there is an effect that the space diversity can be performed more accurately and the reception performance can be further improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a receiving system using a receiving device 1 according to a first embodiment of the present invention.

FIG. 2 is a receiving device 10 according to a second embodiment of the present invention.
It is a block diagram which shows the structure of 0.

[Explanation of symbols]

1 (, 100) ... Receiving device, 2 ... Antenna switching circuit, 3
(, 3-1, 3-2) ... Receiving unit, 4 ... Low-pass filter (LPF), 5 ... High-pass filter (HPF), 11 ...
Tuner, 12 ... Video circuit, 13 ... Audio circuit, 20 ... Headphones, 21 ... Speaker, 101-1 (, 101-
2) ... Receiving main body section, A1 (, A2, A1 ', A2') ...
Signal line, G1 (, G1 ') ... GND signal line, J1 (, J
2) Headphone connection terminal portion of J1a (, J1b, J
2a, J2b) ... Audio signal output terminal.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Koji Onishi             1-7 Aki, Otsuka-cho, Yukiya, Ota-ku, Tokyo             Su Electric Co., Ltd. (72) Inventor Eiji Onishi             1-7 Aki, Otsuka-cho, Yukiya, Ota-ku, Tokyo             Su Electric Co., Ltd. (72) Inventor Katsuyuki Furuguchi             1-7 Aki, Otsuka-cho, Yukiya, Ota-ku, Tokyo             Su Electric Co., Ltd. (72) Inventor Ken Hamada             1-7 Aki, Otsuka-cho, Yukiya, Ota-ku, Tokyo             Su Electric Co., Ltd. (72) Inventor Daisaku Umemoto             1-7 Aki, Otsuka-cho, Yukiya, Ota-ku, Tokyo             Su Electric Co., Ltd. (72) Inventor Toshitaka Kose             1-7 Aki, Otsuka-cho, Yukiya, Ota-ku, Tokyo             Su Electric Co., Ltd. (72) Inventor Hiroshi Noguchi             1-7 Aki, Otsuka-cho, Yukiya, Ota-ku, Tokyo             Su Electric Co., Ltd. F-term (reference) 5K059 AA08 CC03 DD01 DD31 EE01

Claims (3)

[Claims] 1. An antenna switching circuit for adaptively switching or combining antenna output signals input from at least two terminals used for inputting or outputting a voice signal to perform space diversity, and an output of the antenna switching circuit. A receiving apparatus, comprising: a receiving processing unit that performs a receiving process using a signal. 2. A first filter which passes a signal in a frequency band of the antenna output signal and cuts off a signal in a frequency band including at least a voice signal, wherein the antenna output signal is the first filter. The receiving device according to claim 1, wherein the receiving device is input to the antenna switching circuit after passing through. 3. A voice signal to be output from each of the terminals, comprising a second filter that passes a signal in a frequency band including a voice signal and blocks a signal in a frequency band of at least the antenna output signal, The receiving device according to claim 1 or 2, wherein the signal is input to each of the terminals after passing through the second filter.