JPH1013272A - Fn tuner module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a simple and compact system by connecting a phase-locked loop circuit and an intermediate frequency detection circuit to an FM tuner module, including a distribution circuit and also to a front end circuit and turning an entire device into an FM tuner module. SOLUTION: A 1st FM tuner module 100 includes a distribution circuit 110 which distributes the signals inputted from an antenna to a front end circuit 120 and an external 2nd FM tuner module 200 of the following stages. The module 100 also has an input terminal to secure connection to the antenna and an external output terminal to secure connection to the module 200. Furthermore, the module 100 is provided with a channel-selecting phase-locked loop circuit 130 which is connected to the circuit 120, and an intermediate frequency detection circuit 140 which is connected to the next stage of the circuit 120.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an existing FM tuner for audio broadcasting and a data radio channel (hereinafter referred to as DARC (DAta Radio Channel) except for a part thereof).
el). F) including two FM tuners, such as an FM multiplex broadcast receiving system including an FM tuner for broadcasting
The present invention relates to an FM tuner module suitable for constituting an M receiving system.

[0002]

2. Description of the Related Art In recent years, FM multiplex broadcasting has been proposed and put into practical use as a broadcasting for providing various data services simultaneously with the sound of existing FM broadcasting. FM multiplex broadcasting provides services such as text, graphics, and traffic information by frequency division multiplexing a digital signal into a higher frequency band than an audio baseband signal. In particular, FM multiplex broadcasting by DARC is suitable for transmitting relatively large-capacity data for mobile objects.

[0003] In order to make full use of data such as traffic information sent to a mobile body as an FM multiplex broadcast receiving system, an FM tuner dedicated to DARC reception is provided separately from an existing FM tuner for audio broadcasting. It is desirable to have a tuner.

Conventionally, when an FM receiving system including two FM tuners that perform different receiving processes from each other is configured using one antenna, the configuration is as shown in FIG. That is, in FIG. 2, this FM receiving system
First and second FM tuners 600 and 700;
And a distributor 900 for distributing an input signal from the antenna to each of the first and second FM tuners 600 and 700 and outputting the same.

[0005]

In the example shown in FIG. 2, the first FM tuner 600 is an existing audio broadcast F-type tuner.
Assuming that the M tuner is used, in order to configure a receiving system for FM multiplex broadcasting, it is necessary to add two large means of a second FM tuner 700 as a FM tuner for DARC broadcasting and a distributor 900. . That is, conventionally,
When configuring an FM receiving system including two FM tuners, the structure of the system becomes complicated,
There are problems such as difficulty in downsizing. The above problems are not particularly preferable when the FM receiving system is configured to be compatible with a mobile object.

Further, an FM tuner generally requires an intermediate frequency detection circuit and a phase locked loop circuit. Even if these circuits are provided, a simple and compact configuration is desired. In particular, if a receiving system for FM multiplex broadcasting, which is often used for a mobile body, is configured using two FM tuners, it is needless to say that a simple and small configuration is more desirable.

An object of the present invention is to provide an FM tuner module which has a simple and small configuration and is suitable for configuring an FM multiplex broadcast receiving system which is often used for mobile objects.

[0008]

According to the present invention, there is provided an FM tuner module having a distribution circuit for distributing an input signal from an antenna to a front-end circuit in a subsequent stage and an external FM tuner module and outputting the signal. Further, there is provided an FM tuner module comprising: a phase locked loop circuit for channel selection connected to the front end circuit; and an intermediate frequency detection circuit connected to a stage subsequent to the front end circuit.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an FM tuner module according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing a configuration of an FM tuner module according to an embodiment of the present invention. FIG.
In the present embodiment, a first FM tuner module 100 for configuring an FM tuner for DARC broadcasting and a second FM tuner module 200 for configuring an existing FM tuner for audio broadcasting are described. An example of an FM multiplex broadcast receiving system configured by two FM tuner modules and used for a mobile object will be described. still,
The second FM tuner module 200 may also have a configuration for AM reception.

The first FM tuner module 100 according to the present embodiment distributes an input signal from an antenna to a front-end circuit 120 at the subsequent stage and an external second FM tuner module 200 and outputs the signal. have. The first FM tuner module 100 includes an input terminal for connecting to an antenna, and an external output terminal for connecting to the second FM tuner module 200.

Further, the first FM tuner module 1
Reference numeral 00 denotes a tuning phase-locked loop (PLL) circuit 130 connected to the front end circuit 120 and an intermediate frequency detection circuit 1 connected downstream of the front end circuit 120.
40.

The first FM tuner module 100 includes:
DARC is connected to the detection output terminal of the intermediate frequency detection circuit 140.
By connecting a data signal demodulator for broadcasting, D
An FM tuner for ARC broadcasting can be configured.
The configured FM tuner has a simple configuration and a small size.

[0014]

The FM tuner module according to the present invention is an FM tuner module having a distribution circuit for distributing an input signal from an antenna to each of a front-end circuit in a subsequent stage and an external FM tuner module and outputting the same. , Having a phase-locked loop circuit for channel selection connected to the front-end circuit, and an intermediate frequency detection circuit connected to the subsequent stage of the front-end circuit, so that the mobile It is suitable for configuring a receiving system for FM multiplex broadcasting, which is often used for a radio communication system.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an FM tuner module according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a conventional FM multiplex broadcast receiving system.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 first FM tuner module 110 distribution circuit 120 front-end circuit 130 phase locked loop (PLL) circuit 140 intermediate frequency detection circuit 200 second FM tuner module 600 first FM tuner 700 second FM tuner 900 distributor

Claims (1)

[Claims] An FM tuner module having a distribution circuit for distributing an input signal from an antenna to a front-end circuit in a subsequent stage and an external FM tuner module and outputting the same, and further connected to the front-end circuit. An FM tuner module, comprising: a phase-locked loop circuit for channel selection; and an intermediate frequency detection circuit connected to a stage subsequent to the front end circuit.