JP2007060575A - Av system and amplifying device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that it is impossible to acquire a satisfactory broadcast signal from a receiving set which is arranged at an unfavorable position where receiving sensitivity is poor depending on an installed position, the direction and the like of an antenna. <P>SOLUTION: An AV system is connected by a plurality of receiving sets and amplifying devices via a network. While outputting a broadcast signal received by an electric wave, the receiving sets detect the receiving sensitivity of the broadcast signal, and output the detected receiving sensitivity as receiving sensitivity information to the network. The amplifying devices output broadcast signals transmitted from the receiving sets which output the highest receiving sensitivity information from an outputting part, in comparison with the receiving sensitivity information acquired from the plurality of receiving sets connected to the network and the output part for amplifying and outputting a signal received by the amplifying device network interface. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an amplifying apparatus that receives and outputs a signal from a device connected via a network, and an AV system including the amplifying apparatus.

  In recent years, there has been an AV system capable of connecting a plurality of AV devices such as an audio player, a video player, a component stereo, a Derebi receiver, a radio receiver, and an AV (Audio Visual) amplifier via a network and transmitting data between the AV devices. It started to spread. In the AV system, for example, an AV amplifier to which a monitor and a speaker are connected may be installed in the room A, and a video player connected to a television receiver may be installed in the room B. In the room A, when outputting a video signal and an audio signal reproduced by the video player, the AV amplifier transmits a control signal for requesting data transmission to the video player, and the video player sends the data to the AV amplifier in accordance with the control signal. The AV amplifier receives the data transmitted from the video player, and outputs the video signal and audio signal of the data from the monitor and the speaker. Such a system is disclosed in Patent Document 1 and Patent Document 2.

JP 2001-125864 A JP 2001-257707 A

  In systems such as those disclosed in Patent Documents 1 and 2, a plurality of radio broadcast receivers (tuners) such as a radio receiver that receives radio broadcasts and a television receiver that receives television broadcasts are connected to a network, and An AV amplifier equipped with a radio receiver may be connected to the network. In this system, for example, a radio broadcast may be received by a radio receiver mounted on an AV amplifier, and an audio signal may be output from the AV amplifier. In such a case, the radio wave reception state changes depending on the installation position and direction of the antenna connected to or built in the radio receiver, or the radio wave transmission state differs depending on the broadcast station. Even when receiving, the reception state may differ depending on the location where the radio receiver is installed. For example, when a plurality of radio receivers are scattered in each room at home, the radio receiver A in the room A is more sensitive than the radio receivers in other rooms for the broadcasting station A, For station B, radio receiver B in room B may be more sensitive than radio receivers in other rooms.

  For this reason, in the AV system, when the sensitivity of the radio receiver mounted on the AV amplifier is poor, the AV amplifier cannot reproduce and output a high-quality audio signal of radio broadcasting.

  In addition, as a coping method when the reception state deteriorates due to the reception position of the broadcast signal, for example, a broadcast system such as RDS (Radio Data System) can be used. Both radio receivers need to be compatible with the broadcasting system, and cannot be used in radio receivers and areas that are not compatible with the broadcasting system.

  The in-vehicle radio receiver can use, for example, a diversity technique in which a plurality of antennas are installed and an antenna having a high reception sensitivity is selected from the plurality of antennas. However, in general households, it is necessary to install multiple antennas in multiple locations (rooms) and receive with a radio receiver having a diversity function, and the installation of multiple antennas increases the number of wires. It becomes complicated.

  In addition, when an antenna or a wiring connected to the antenna is installed around a television receiver or a personal computer, the reception state may be deteriorated by high-frequency radio waves radiated from the television receiver or the personal computer.

  An object of the present invention is to provide an amplifying apparatus and an AV system capable of receiving and outputting a broadcast signal with good sensitivity by a tuner connected to a network without increasing the number of antennas or the number of wires. To do.

  The present invention relates to an AV system in which a plurality of reception devices that receive broadcast signals by radio waves, an amplification device that amplifies and outputs a signal, and the plurality of reception devices and the amplification device are connected via a network. The receiving device includes a receiving device network interface that connects to the network and transmits / receives data, a receiving device receiving unit that receives a broadcast signal by radio waves and detects receiving sensitivity of the broadcasting signal, and the receiving device receiving unit includes: A control unit that outputs the detected reception sensitivity to the network as reception sensitivity information, wherein the amplification device is connected to the network and transmits / receives data, and a signal received by the amplification device network interface An output unit for amplifying and outputting, and connected to the network Amplification for obtaining reception sensitivity information from the plurality of reception devices, comparing the received reception sensitivity information, and outputting a broadcast signal transmitted from the reception device that has output the highest reception sensitivity information from the output unit And an apparatus control unit.

  The present invention relates to an amplification device that is connected to a network to which a plurality of reception devices capable of receiving broadcast signals by radio waves are connected, and amplifies and outputs a signal received from the network. An amplifier network interface that performs transmission / reception, a signal processing unit that performs signal processing on a signal received by the amplifier network interface, an output unit that amplifies and outputs a signal output from the signal processing, and the amplifier A plurality of receiving devices connected to the network via a network interface receive a specific broadcast signal, and reception sensitivity information indicating reception sensitivity of the received broadcast signal is acquired from the plurality of receiving devices. The reception sensitivity information that has the highest reception sensitivity among the reception sensitivity information is output. Select device, characterized in that it comprises an amplifying device controller for controlling the output from the acquired broadcast signal the output unit receiving sensitivity from highest reception apparatus.

  The present invention further includes an amplifying apparatus receiving unit that receives and outputs a broadcast signal by radio waves and detects reception sensitivity of the broadcast signal and outputs reception sensitivity information in the amplifying apparatus described above, A receiving device or an amplifying device receiving unit having the highest receiving sensitivity is selected from among a plurality of receiving devices connected to the network and receiving sensitivity information acquired from the amplifying device receiving unit, and the receiving device or the amplifying device having the highest receiving sensitivity is selected. Control is performed to acquire a broadcast signal from the apparatus receiving unit and output from the output unit.

  According to the present invention, in an amplifying apparatus in which a plurality of AV devices are connected to a network and an AV system including the amplifying apparatus, the sensitivity is improved by a tuner connected to the network without increasing the number of antennas or the number of wires. Good broadcast signals can be received and output.

FIG. 1 is a diagram showing a schematic configuration of an embodiment of an AV system of the present invention.
In FIG. 1, an AV system will be described taking an AV system installed in a home as an example. The AV system includes an amplification device (AV amplifier) 100 with a built-in radio tuner, a radio receiver 200, a radio tuner, a component stereo 300 with a compact disc (CD: Compact Disc) player and a mini disc (MD: Mini Disc) player, digital A Versatile Disc (DVD) player 400, a hard disk (HD: Hard Disc) recorder 500 with a built-in TV tuner, and a TV receiver 600 are provided. The AV amplifier 100, the radio receiver 200, the component stereo 300, and the HD recorder 500 are , Connected to the network 700.

  The AV system is installed in a home, and each device is installed in each of room A to room D. That is, as shown in FIG. 1, an AV amplifier 100 and a DVD player 400 are installed in a room A (for example, a listening room). The AV amplifier 100 displays an antenna 100a for an AV amplifier radio tuner and an image. A monitor 100b for outputting sound and a speaker 100c for outputting sound are connected. A radio receiver 200 is installed in a room B (for example, a bedroom), and an antenna 200a for receiving radio broadcasts is connected to the radio receiver 200. A component stereo 300 is installed in the room C (for example, a study room), and an antenna 300a for receiving radio broadcasts is connected to the component stereo 300. An HD recorder 500 and a television receiver 600 are installed in the room D (for example, a living room).

  The network 700 is, for example, a local area network (LAN) and the like, and can establish / disconnect communication between devices, transmit control signals, transmit data, and the like.

  The AV amplifier 100 includes a radio tuner (AV amplifier radio tuner), amplifies the audio signal received by the AV amplifier radio tuner, and outputs the amplified audio signal to the speaker 100c. In addition, the AV amplifier 100 transmits a control signal to the radio receiver 200 and the component stereo 300 connected to the network 700 to control radio broadcast reception of the radio receiver 200 or the component stereo 300, and at the same time, the radio receiver 200. Alternatively, the broadcast signal of the radio broadcast received by the component stereo 300 is received via the network, and the audio signal is amplified and output from the speaker 100c.

  The radio receiver 200 receives a radio broadcast by the antenna 200a and outputs an audio signal of the received broadcast signal to a speaker or AV amplifier 100 built in the radio receiver 200. Here, for convenience of explanation, in the following explanation, the radio receiver 200 will be described as the first radio tuner 200.

  The component stereo 300 is a device in which a CD player and an MD player are mounted in addition to the function of receiving a radio broadcast. The component stereo 300 receives a radio broadcast by the antenna 300 a and outputs an audio signal of the received broadcast signal to a speaker or the AV amplifier 100 built in the component stereo 300. The component stereo 300 reproduces a CD or MD, and outputs the reproduced audio signal to a speaker or AV amplifier 100 built in the component stereo 300. Here, for convenience of explanation, the component stereo 300 will be described as the second radio tuner 300 in the following explanation.

  Further, the first radio tuner 200 and the second radio tuner 300 have a function of receiving a control signal from the AV amplifier 100. The first radio tuner 200 and the second radio tuner 300 specify information and devices indicating that the first radio tuner 200 and the second radio tuner 300 are radio tuners based on a control signal from the AV amplifier 100. Send information. The first radio tuner 200 and the second radio tuner 300 are based on a control signal from the AV amplifier 100, select a broadcast station requested from the AV amplifier 100, receive a broadcast signal, and receive sensitivity indicating radio broadcast reception sensitivity. Transmission of information to the AV amplifier 100, start and stop of reception of radio broadcasts, and transmission of broadcast signals of received broadcast stations to the AV amplifier 100 are performed.

  In the first radio tuner 200 and the second radio tuner 300, the radio broadcast reception sensitivity is detected by the intensity of the received radio wave. The reception sensitivity is detected by changing the reception frequency around a predetermined center frequency (the frequency of the broadcast station), and the received radio wave intensity level at the frequency at which the received radio wave intensity is maximized. The value of The detected value is transmitted to the AV amplifier 100 as reception sensitivity information.

  The DVD player 400 reproduces the DVD and outputs the reproduced video signal and audio signal to the AV amplifier 100 to which the DVD player is connected. The AV amplifier 100 outputs the video signal and audio signal output from the DVD 400 from the monitor 100b and the speaker 100c.

  The HD recorder 500 has a built-in TV tuner, records a TV broadcast signal received by the TV tuner on the HD, and receives a video signal and an audio signal recorded on the HD on the TV receiver to which the HD recorder 500 is connected. Output to the machine 600. The television receiver 600 receives and outputs a television broadcast signal.

The AV system of this embodiment will be described. In this embodiment, an AV amplifier 100 and a first radio tuner (radio receiver) 200 in the AV system will be described as an example.
FIG. 2 is a diagram illustrating a schematic configuration of the AV amplifier and the first radio tuner according to the present embodiment.

First, the AV amplifier 100 will be described.
The AV amplifier 100 includes a network interface 101, an input unit 102, an AV amplifier radio tuner 103, a signal processing unit 104, a video output unit 105, an audio output unit 106, an operation unit 107, a display unit 108, a reception sensitivity information storage unit 109, and a control. The unit 110 is provided.

  The network interface 101 is connected to the network 700, and transmits control signals to other devices via the network 700 and receives data transmitted from other devices. When the data transmitted from another device is a control signal, the network interface 101 outputs the data to the control unit 110 described later, and the data transmitted from the other device is a video signal or an audio signal. Is output to the signal processing unit 104 described later.

  The input unit 102 receives video signals and audio signals input from other devices, and outputs the received video signals and audio signals to a signal processing unit 104 described later. In this embodiment, the input unit 102 receives a video signal and an audio signal input from the DVD player 400 as shown in FIG.

  The AV amplifier radio tuner 103 selects a radio broadcast station to be received based on the control of the control unit 110 to be described later, receives the radio broadcast selected by the antenna 100a, and converts the received broadcast signal into an audio signal. The audio signal is converted and output to the signal processing unit 104. The AV amplifier radio tuner 103 detects the reception sensitivity of the received broadcast signal based on the control of the control unit 110 described later, and outputs the detected value to the control unit 110 as reception sensitivity information. Here, the reception sensitivity of the AV amplifier radio tuner 103 is detected by the same method as that of the first radio tuner 200 or the second radio tuner 300 described above.

  The signal processing unit 104 decodes a video signal and an audio signal input from the network interface 101 or an audio signal input from the AV amplifier radio tuner 103, a decoding process such as a decompression process, a decompression process for decompressing compressed data, and an audio signal. Is processed into a surround signal, the video signal is output to the video output unit 105, and the audio signal is output to the audio output unit 106.

  The video output unit 105 converts the video signal input from the signal processing unit 104 into an analog video signal suitable for the display method of the monitor 100b connected to the AV amplifier 100, and outputs the analog video signal to the monitor 100b. .

  The audio output unit 106 performs digital-analog conversion processing on the audio signal input from the signal processing unit 104, amplifies the analog audio signal, and outputs the amplified analog audio signal to the speaker 100 c connected to the AV amplifier 100.

  The operation unit 107 selects a device for reproducing a video signal and an audio signal from devices directly connected to the AV amplifier 100 via the network 700, and a method for reproducing an audio signal (stereo output, multichannel output). ) Selection, adjustment of the amplification level of the audio signal, selection of a broadcast station to be received by the AV amplifier radio tuner 103, and the like, and a control unit 110 (to be described later) based on the operation button operated by the user. Output to.

  The display unit 108 performs display related to the device selected by the operation unit, display related to the amplification level of the audio signal, display related to channel selection of the broadcasting station in the AV amplifier radio tuner 103, and the like based on control of the control unit 110 described later. .

  The reception sensitivity information storage unit 109 stores reception sensitivity information and identification information for specifying the device that has acquired the reception sensitivity information based on the control of the control unit 110 described later.

  The control unit 110 comprehensively controls the AV amplifier 100 as a whole. Based on the instruction signal from the operation unit 107, the control unit 110 selects a device that receives the video signal and audio signal output from the AV amplifier 100, and selects an audio signal output method (stereo output, surround output, etc.). The audio signal volume is adjusted, the AV amplifier radio tuner 103 selects a broadcast station to be received, and the like.

  When the user operates the operation unit 107 to select a radio tuner function and selects a broadcast station to receive, the control unit 110 automatically selects the AV amplifier radio tuner 103, the first radio tuner 200, and the second radio tuner 300. On the other hand, a tuner selection process is performed. Here, the control unit 110 obtains information (such as type) of the device connected to the network 700 and controls selection of a broadcast station to receive, etc., according to the communication protocol of the network 700 to which the AV amplifier 100 is connected. I do.

The tuner selection process will be described.
When the radio tuner function is selected and the receiving broadcast station is selected, the control unit 110 of the AV amplifier 100 causes the AV amplifier radio tuner 103 to select the receiving broadcast station, receive the radio broadcast, and The reception sensitivity of the selected broadcast station in the AV amplifier radio tuner 103 is detected. Then, the control unit 110 acquires the detected reception sensitivity information and stores the reception sensitivity information in the reception sensitivity information storage unit 109.

  In addition to the detection of the reception sensitivity in the AV amplifier radio tuner 103, the control unit 110 requests the device connected to the network 700 to transmit device information and acquires the device information. Here, in response to a device information transmission request from the AV amplifier 100, among devices connected to the network 700, a device that does not support a communication protocol for transmission / reception of control signals or a device whose power is off is displayed as device information. Does not respond to the control signal of the transmission request.

  The control unit 110 detects devices (a first radio tuner 200 and a second radio tuner 300) having a radio broadcast reception function from the acquired device information, and receives sensitivity to the first radio tuner 200 and the second radio tuner 300. Request to send information. In response to the transmission request for the reception sensitivity information, the control unit 110 stores the reception sensitivity information acquired from the first radio tuner 200 and the second radio tuner 300 in the reception sensitivity information storage unit 109.

  Here, in the transmission request of the reception sensitivity information to the first radio tuner 200 or the second radio tuner 300 connected to the network 700, the first radio tuner 200 or the second radio tuner 300 receives the radio wave of the broadcast signal. If the first radio tuner 200 or the second radio tuner 300 has already started receiving broadcast signals from other broadcast stations, the first radio tuner 200 or the second radio tuner 300 sends reception rejection information to the AV amplifier 100. Send.

  Also, the first radio tuner 200 or the second radio tuner 300 is a device (for example, a double tuner) having a plurality of receiving circuits for receiving radio waves of broadcast signals, and has already started receiving broadcast signals from other broadcast stations. If there is a receiving circuit that does not receive the broadcast signal, the first radio tuner 200 or the second radio tuner 300 receives the broadcast signal of the broadcasting station based on the broadcasting station information by the receiving circuit and receives the reception sensitivity. And reception sensitivity information is transmitted to the AV amplifier 100. In addition, even in a device having a plurality of receiving circuits, when all the receiving circuits are receiving broadcast signals, the device transmits reception refusal information to the AV amplifier 100.

  When the reception refusal information is received from the first radio tuner 200 or the second radio tuner 300, the control unit 110 of the AV amplifier 100 stops the selection of the broadcasting station in the device and removes the radio tuner from the tuner selection target. Take control. Thus, when another person is already listening to the radio broadcast, the listening is not disturbed.

  In the transmission request of the reception sensitivity information to the first radio tuner 200 and the second radio tuner 300 connected to the network 700, the first radio tuner 200 and the second radio tuner 300 have a radio when the power is in a standby state. A circuit for receiving broadcasts is operated to select a broadcast station, detect reception sensitivity information, and transmit the reception sensitivity information to the AV amplifier 100.

  The control unit 110 of the AV amplifier 100 compares the reception sensitivity information stored in the reception sensitivity information storage unit 109 and selects the radio tuner having the highest reception sensitivity. When the control unit 110 selects a radio tuner, the control unit 110 requests the selected radio tuner to transmit data of a broadcast signal. When the control unit 110 receives data transmitted from the radio tuner, the control unit 110 receives the network interface 101, the signal processing unit 104, The audio output unit 107 is controlled to control the audio signal received from the radio tuner to be output from the audio output unit 106.

  Here, in the tuner selection process, the control unit 110 mutes the output of the audio output unit 106, performs the tuner selection process, and mutes the output of the audio output unit 106 when the tuner is selected and outputs an audio signal. Control to output the analog audio signal.

  Further, the control unit 110 acquires the reception sensitivity information in the tuner selection process every time the user operates the operation unit 107 and the radio tuner function is selected, and when new reception sensitivity information is acquired, a new reception sensitivity is obtained. Update to information. In addition, when only a specific radio tuner is selected a predetermined number of times (for example, 5 times) or more for a specific broadcasting station from the reception sensitivity information stored in the reception sensitivity information storage unit 109, the control unit 110 The radio tuner is selected without performing processing for acquiring reception sensitivity information in another radio tuner. As a result, the tuner selection processing time can be shortened.

  In the tuner selection process, when the user operates the operation unit 107 and selects a radio tuner, the control unit 110 displays on the display unit 108 that the radio tuner has been selected, and broadcast station information indicating the broadcast station. (For example, “FM1”, “FM2”, “AM1”, “AM2”) are displayed. The broadcast station information has a frequency set in advance. For example, in the case of “FM1”, NHK radio broadcast is selected. When the user views the broadcast station information displayed on the display unit 108, operates the operation unit 107, and selects a broadcast station to receive, the control unit 110 automatically transmits the broadcast station to the AV amplifier radio tuner 103. To receive the reception sensitivity information. At the same time, the control unit 110 acquires device information for the devices connected to the network 700 and acquires reception sensitivity information from the first radio tuner 200 and the second radio tuner 300 specified by the device information. . Then, a radio tuner having the highest reception sensitivity is selected, a broadcast signal received from the radio tuner is received, and an audio signal of the broadcast signal is output.

  Thus, by selecting the user's radio tuner and selecting the broadcast station, the user can select the radio tuner with the best reception sensitivity without noticing the user, and the audio signal of the broadcast signal received by the radio tuner can be selected. Can be output.

Next, the first radio tuner 200 will be described.
In FIG. 2, the first radio tuner 200 includes a radio reception unit 201, an output unit 202, a network interface 203, a display unit 204, an operation unit 205, and a control unit 206. Although not shown, the first radio tuner 200 is connected to an amplifier, and an audio signal of radio broadcast received through the amplifier is output from a speaker.

  The radio reception unit 201 selects a broadcast station to receive based on the control of the control unit 206, which will be described later, receives a radio broadcast by the antenna 200a, converts the received broadcast signal into an audio signal, and outputs it to the output unit 202. Output. The radio reception unit 201 detects the reception sensitivity of the received broadcast signal based on the control of the control unit 206 described later, and outputs reception sensitivity information indicating the reception sensitivity to the network interface 203.

  The output unit 202 converts the broadcast signal input from the radio reception unit 201 into an audio signal and outputs the audio signal to an external device.

  Similar to the network interface 101 of the AV amplifier 100, the network interface 203 is connected to the network 700, and transmits a control signal to another device and receives data transmitted from the other device via the network 700. When the data transmitted from another device is a control signal, the network interface 101 outputs the data to the control unit 206 described later.

  The display unit 204 displays broadcast station information that identifies a radio broadcast to be received. The operation unit 205 includes buttons for selecting a radio broadcast station to be received, and outputs an instruction signal corresponding to the operated button to the control unit 206.

  The control unit 206 comprehensively controls the first radio tuner 200 as a whole. The control unit 206 controls the radio reception unit 201 based on an instruction signal from the operation unit 205, selects a broadcast station to receive, converts the received broadcast signal into an audio signal, and outputs the audio signal from the output unit 202. .

  Further, when the network interface 203 receives a control signal from another device, the control unit 206 operates based on the control signal. For example, when receiving a control signal for requesting transmission of device information from the AV amplifier 100, the control unit 206 transmits the device information to the AV amplifier 100. In addition, when receiving a control signal for transmission request for reception sensitivity information from the AV amplifier 100, the control unit 206 controls the radio reception unit 201, and based on the information on the receiving broadcast station included in the control signal, Is selected, the reception sensitivity is detected, and the detected reception sensitivity is transmitted to the AV amplifier 100 as reception sensitivity information. Further, when the control unit 206 receives the transmission start control signal from the AV amplifier 100, the control unit 206 controls the radio reception unit 201 to receive the broadcast signal of the selected radio broadcast station, and the received broadcast signal. Is converted to a digital audio signal and transmitted to the AV amplifier 100 via the network interface 203.

Next, the operation of selecting a radio tuner in the AV system of this embodiment will be described.
FIG. 3 is a flowchart showing a tuner selection process in the AV amplifier of this embodiment.
In the AV amplifier 100 shown in FIG. 2, when the user selects a radio tuner as a device for reproducing a video signal or an audio signal by the operation unit 107 and selects a broadcast station to receive, the operation unit 107 transmits an instruction signal to the control unit. To 110.

  In FIG. 3, when the control unit 110 determines that a radio tuner is selected and a broadcast station to receive is selected based on an instruction signal from the operation unit 107 (S301), the control unit 110 executes a tuner selection process.

  The control unit 110 controls the AV amplifier radio tuner 103 to receive the broadcast signal of the selected broadcast station (S302).

  When the AV amplifier radio tuner 103 can receive the selected broadcast station, the control unit 110 causes the AV amplifier radio tuner 103 to detect the reception sensitivity of the broadcast station (S304). When the AV amplifier radio tuner 103 detects the reception sensitivity information, the control unit 110 acquires the reception sensitivity information, and the reception sensitivity information storage unit 109 together with the identification information that identifies the reception sensitivity information as the AV amplifier tuner 103. (S305).

  In addition, the control unit 110 starts controlling the reception of the broadcast signal to the AV amplifier radio tuner 103, and at the same time acquires information on the devices connected to the network 700. A control signal for requesting transmission of device information is output (S303).

  A device that has received a control signal for requesting transmission of device information from the AV amplifier 100 transmits device information to the AV amplifier 100. Here, in a device connected to the network 700, when the power is off, or when the control signal / data transmission / reception process with the AV amplifier 100 is not supported, the device connects to the AV amplifier 100. No information etc. is transmitted. In addition, in a device connected to the network 700, when the power supply is in a standby state, when the device receives a control signal for requesting transmission of device information, the device operates only a necessary circuit and causes the AV amplifier 100 to operate. Send information.

  Upon receiving device information from each device connected to the network 700, the control unit 110 of the AV amplifier 100 specifies a radio tuner (first radio tuner 200, second radio tuner 300) from the device information (S306). . Then, the control unit 110 transmits a control signal for requesting transmission of reception sensitivity information to the first radio tuner 200 and the second radio tuner 300 (S307). Note that the control signal for requesting transmission of the reception sensitivity information includes broadcast station information for specifying the broadcast station to receive.

  When the first radio tuner 200 and the second radio tuner 300 receive the control signal for the transmission request for the reception sensitivity information from the AV amplifier 100, the first radio tuner 200 and the second radio tuner 300 operate only the circuits necessary for reception of the broadcast station, and the broadcast included in the control signal Based on the station information, a broadcast station to be received is selected and reception of a broadcast signal is started. Then, after receiving the broadcast signal for a predetermined time (for example, 1 to 2 seconds), the reception sensitivity at the broadcast station is detected, and the reception sensitivity information is transmitted to the AV amplifier 100.

  Upon receiving the reception sensitivity information transmitted from the first radio tuner 200 or the second radio tuner 300, the AV amplifier 100 stores the received sensitivity information in the reception sensitivity information storage unit 109 under the control of the control unit 110. (S308).

  When the control unit 110 of the AV amplifier 100 acquires the reception sensitivity information from all the radio tuners connected to the network 700, the control unit 110 compares the reception sensitivity information stored in the reception sensitivity information storage unit 109 (S309) and receives the most reception. A radio tuner having high sensitivity (AV amplifier radio tuner 103, first radio tuner 200, or second radio tuner 300) is selected (S310). In the present embodiment, the first radio tuner 200 is the radio tuner having the highest reception sensitivity.

  The control unit 110 transmits a reception start control signal to the first radio tuner 200 having the best reception sensitivity so as to receive the broadcast station (S311).

  Upon receiving the reception start control signal transmitted from the AV amplifier 100, the first radio tuner 200 starts receiving the broadcast signal of the selected broadcast station, converts the received broadcast signal into a digital audio signal, The digital audio signal is transmitted to the AV amplifier 100 via the network 700 by the network interface 203.

  The AV amplifier 100 receives the digital audio signal transmitted from the first radio tuner 200 by the network interface 101. The received digital audio signal is subjected to signal processing by the signal processing unit 104, converted into an analog audio signal by the audio output unit 106, and output from the speaker 100c (S312).

  As described above, in the AV system of this embodiment, when a radio tuner is selected and a broadcast station to be received is selected, the radio tuner connected to the network including the radio tuner built in the AV amplifier is selected. Therefore, the reception sensitivity information of the selected broadcast station can be acquired, and the audio signal of the broadcast signal received by the radio tuner having the highest reception sensitivity can be output. Therefore, the user can listen to a radio broadcast with good reception sensitivity. In addition, since a broadcast signal of a radio tuner with good reception sensitivity can be acquired via a network, it is not necessary to install an extra antenna, and the number of wires can be reduced.

  In the above-described embodiment, the ratio broadcast is described as an example. However, the present invention is not limited to this, and the present invention can be applied to a television broadcast and a digital terrestrial broadcast even in the case of a television broadcast and a satellite broadcast.

The figure which shows schematic structure of one Example of AV system of this invention. The figure which shows schematic structure of AV amplifier and a 1st radio tuner of a present Example. 6 is a flowchart showing tuner selection processing in the AV amplifier according to the embodiment.

Explanation of symbols

100 ... AV amplifier, 100a ... antenna, 100b ... monitor, 100c ... speaker, 200 ... radio receiver, 200a ... antenna, 300 ... component stereo, 300a ... Antenna, 400 ... DVD player, 500 ... HD recorder, 600 ... TV receiver, 700 ... network.
DESCRIPTION OF SYMBOLS 101 ... Network interface, 102 ... Input part, 103 ... AV amplifier radio tuner, 104 ... Signal processing part, 105 ... Video output part, 106 ... Audio output part, 107 ... Operation unit 108... Display unit 109... Reception sensitivity information storage unit 110.
201 .. Radio receiving unit, 202... Output unit, 203... Network interface, 204... Display unit, 205.

Claims (4)

  In an AV system in which a plurality of receiving apparatuses that receive broadcast signals by radio waves, an amplifying apparatus that amplifies and outputs a signal, and the plurality of receiving apparatuses and the amplifying apparatus are connected via a network, the receiving apparatus includes: A receiver network interface connected to the network for transmitting and receiving data; a receiver for receiving broadcast signals by radio waves and detecting the reception sensitivity of the broadcast signals; and a receiver sensitivity detected by the receiver receiver And a control unit that outputs to the network as reception sensitivity information, the amplifying device is connected to the network and transmits / receives data, and amplifies and outputs the signal received by the amplifying device network interface And the output unit that is connected to the network. Amplifying device control unit that obtains reception sensitivity information from the receiving device, compares the obtained reception sensitivity information, and outputs the broadcast signal transmitted from the receiving device that has output the highest reception sensitivity information from the output unit An AV system comprising:   2. The AV system according to claim 1, wherein the amplifying device further includes an amplifying device receiving unit that receives and outputs a broadcast signal by radio waves, detects a receiving sensitivity of the broadcasting signal, and outputs receiving sensitivity information. The control unit selects the receiving device or the amplifying device receiving unit that outputs the receiving sensitivity information having the highest receiving sensitivity from the receiving sensitivity information acquired from the plurality of receiving devices connected to the network and the amplifying device receiving unit. And an AV system that performs control to acquire a broadcast signal output from the receiving device or the amplifying device receiving unit having the highest receiving sensitivity and output the broadcast signal from the output unit.   An amplification device that is connected to a network to which a plurality of reception devices capable of receiving broadcast signals by radio waves are connected, amplifies and outputs a signal received from the network, and transmits and receives data connected to the network A device network interface, a signal processing unit that performs signal processing on a signal received by the amplification device network interface, an output unit that amplifies and outputs a signal output from the signal processing, and the amplification device network interface A plurality of receiving devices connected to the network to receive a specific broadcast signal, obtain reception sensitivity information indicating reception sensitivity of the received broadcast signal from the plurality of receiving devices, Select the receiving device that has output the highest receiving sensitivity information. And, amplifying device, characterized in that acquires a broadcast signal reception sensitivity is the highest receiving apparatus comprising an amplifying device controller for controlling output from the output unit.   4. The amplifying apparatus according to claim 3, further comprising: an amplifying apparatus receiving unit that receives and outputs a broadcast signal by radio waves, detects reception sensitivity of the broadcast signal, and outputs reception sensitivity information; The control unit selects the receiving device or the amplifying device receiving unit having the highest receiving sensitivity from the receiving sensitivity information acquired from the plurality of receiving devices connected to the network and the amplifying device receiving unit, and has the highest receiving sensitivity. An amplifying apparatus that performs control to acquire a broadcast signal from a receiving apparatus or an amplifying apparatus receiving section and output the broadcast signal from the output section.

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