JPH0722908A - Radio receiver - Google Patents

Abstract

PURPOSE:To prevent to give an erroneous change feeling to a listener within a tunnel by constituting a radio receiver so that the voice broadcast is not repeated intermittently for more than twice even if there exist a broadcast where the voice broadcast is possible to be reproduced whereas the digital broadcast is impossible to be demodulated. CONSTITUTION:In a radio receiver, a voice reproduction means 2 enables the mute control by the designation of a control means 4, and the receiver is provided with a group station storage means 5 having a storage area where the transmission frequency of the same group station is made to be stored and a storage area where the transmission frequency is marked so as to be discriminated. Before the marked transmission frequency is designated it to a tuning means 1, mute-on is designated to the voice reproduction means 2. Because the reproduction suppression of voice broadcasting is enabled and the output becomes a silence state if this matter is performed, the repeating of the reproduction of voice broadcasting is prevented from being continued more than twice even if broadcasting where voice broadcasting is possible to be reproduced and digital broadcasting is impossible to be demodulated exists.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION This invention relates to radio receivers. More specifically, the present invention relates to NF (N) in RDS (Radio data system) operated in Europe.
Regarding radio receivers that support etwork follow).

The present invention is particularly applicable to, but not limited to, a radio receiver mounted on a vehicle.

[0003]

2. Description of the Related Art In Europe, RDS is operated, and a radio receiver corresponding to NF in RDS is known. In this type of radio receiver, a circuit for demodulating a digital broadcast, which is frequency-multiplexed with an audio broadcast, is added, and is intermittent to a broadcasting station of the same series broadcast by the digital broadcast. Tuning control is performed, and the reception frequency is automatically changed to the affiliated station determined to be able to receive better.

FIG. 7 is a flow chart for explaining the conventional tuning control, that is, NF control. In addition,
The radio receiver in which the control is executed, in addition to the circuit for demodulating the digital broadcast, means for measuring the electric field strength near the tuning frequency, and the AF (Alternative Frequency) list broadcast by the digital broadcast, that is, A means for storing a list of transmission frequencies of affiliated stations is also added. Then, it is assumed that the broadcast AF list is already stored separately.

The control is intermittently executed at appropriate intervals. In step H100, the reception frequency is changed to the affiliated station in the stored AF list. In the reception frequency change, if a plurality of transmission frequencies of affiliated stations are stored in the AF list, the transmission frequencies are cyclically applied every time the control is executed.

In step H101, the electric field strength after the change of the reception frequency is measured and compared with the electric field strength before the change. If the electric field strength is stronger, control transfers to step H102. On the other hand, if the electric field strength becomes too weak, the control shifts to step H104, where the reception frequency is returned to the state before the change,
The control ends.

In step H102, a PI (Program Identification) code broadcast by the digital broadcasting after the reception frequency change, that is, a code indicating a series of broadcasting stations is confirmed. If the PI code received and demodulated after the change matches the PI code received and demodulated before the change, the received frequency is not returned and the control ends.

On the other hand, if the coincidence of the PI code cannot be confirmed, the control shifts to step H104, and step H10
In 4, the reception frequency is returned to the value before the change, and the control ends.

[0009]

It is assumed that the NF compatible radio receiver is mounted on a vehicle and the vehicle enters a long tunnel. In such a case, if the traffic information broadcasted inside the tunnel is excluded, most broadcasts are significantly attenuated and the reproduced sound is only noise.

However, even in such a situation, some broadcasts may be received to the extent that a voice broadcast mixed with noise can be heard. FIG. 8 is a diagram explaining a problem of the conventional NF control under the environment.

FIG. 1A is a graph showing the electric field strength of broadcasting. In the figure, S ₀ is the electric field strength required to demodulate the digital broadcast without error. Since the electric field strength of the broadcasting station A is remarkably attenuated in the tunnel, only noise is reproduced even when tuning is performed.

On the other hand, the electric field strength of the broadcasting station B is attenuated to the extent that the digital broadcasting cannot be demodulated in the tunnel, but the electric field strength is stronger than that of the broadcasting station A, and if tuning is performed, noise will occur. The audio broadcast mixed with is played.

It is assumed that the broadcasting stations A and B are affiliated stations and were receiving the broadcasting station A before entering the tunnel. Then, in the conventional NF control, the broadcasting station B
The reception frequency is intermittently changed to the transmission frequency of.

However, even if the receiving frequency is changed to the broadcasting station B, the digital broadcasting cannot be demodulated and the coincidence of the PI codes cannot be confirmed, so that the receiving frequency is returned to the broadcasting station A again.

Then, such control is repeatedly executed, although intermittently. FIG. 6B is a time chart explaining the reproduced sound at that time. Same figure (a), (c)
, (E), (ki) ... Since the reception frequency is tuned to the broadcasting station A, only noise is reproduced. On the other hand, in (a), (d), (f), ... In the figure, since the reception frequency is tuned to the broadcasting station B, the audio broadcasting mixed with noise is reproduced.

Incidentally, in the actual situation, it takes about several hundred ms to determine whether the digital broadcast cannot be demodulated. Therefore, it is naturally expected that the listener notices the reproduction of the audio broadcast mixed with noise in the period, that is, in the period in which the reception frequency is tuned to the broadcasting station B.

In such a case, there is a sufficient possibility that the listener feels that he / she is in tune with the unreceivable broadcasting station A in spite of having the broadcasting station B that can be received (( In the following description, the feeling given by the operation will be referred to as “mischange feeling”), and there is a possibility of giving an erroneous judgment that there is a defect in the NF control or an abnormality has occurred in the radio receiver. is there.

A technical object of the present invention is to pay attention to such a problem, and to eliminate giving a listener a mistake change feeling in a tunnel in a radio receiver corresponding to the NF function in RDS.

[0019]

FIG. 1 is a block diagram for explaining the basic principle of the present invention. 3. The radio receiver according to claim 1, wherein the tuning means 1 receives radio waves, tunes to a frequency designated by the control means 4, and outputs a detection signal and an electric field strength near the tuning frequency, and the tuning means 1.
Broadcast by the audio reproduction means 2 for reproducing the audio broadcast from the detection signal output by the device, the data demodulation means 3 for demodulating the digital broadcast from the detection signal output by the tuning means 1, and the digital broadcast demodulated by the data demodulation means 3. The control means 4 intermittently assigns the transmission frequency of the same-series station to the tuning means 1 and investigates the electric field strength output from the tuning means 1.

In such a structure, in the radio receiver according to the first and second aspects, the sound reproducing means 2 can perform the mute control by the designation of the control means 4.

Further, the radio receiver according to claims 1 and 2 comprises the affiliated station storage means 5 having a storage area for storing the transmission frequencies of the same affiliated station and a storage area for marking the transmission frequencies in a distinguishable manner. Have

Further, in such a configuration, the first aspect
In the radio receiver, the control means 4 stores the transmission frequency of the same-series station demodulated by the data demodulation means 3 in the affiliated-station storage means 5, and the digital broadcast is demodulated among the transmission frequencies. Means for marking incapable ones as identifiable and storing in the affiliated station storage means 5;
Before the tuning means 1 is designated with the marked transmission frequency, a means for designating the audio reproduction means 2 to be muted on is provided.

In the radio receiver according to the second aspect of the present invention, the control means 4 stores the transmission frequency of the same-series station demodulated by the data demodulation means 3 in the affiliated-station storage means 5. And a means for making the affiliated station storage means 5 store the transmission frequency that does not reach a predetermined value of the electric field intensity output from the tuning means 1 in a distinguishable manner. Prior to designating the transmission frequency in the tuning means 1, there is provided means for designating mute on in the sound reproducing means 2.

[0024]

In the radio receiver of claim 1, if the transmission frequency of the affiliated station includes a transmission frequency in which the digital broadcast cannot be demodulated, it can be identified that the digital broadcast cannot be demodulated in the transmission frequency. It is marked and stored.

Once the memory is stored, the mute is controlled to tune to the frequency again. That is, the reproduction of the audio broadcast is suppressed, and the audio output of the radio receiver becomes silent.

Therefore, even if there is a broadcast in which the audio broadcast can be reproduced and the digital broadcast cannot be demodulated at the transmission frequency of the affiliated station, the reproduction of the audio broadcast is not repeated twice or more intermittently.

On the other hand, the conventional reason for giving the listener a sense of mischange in the tunnel is that intermittent reproduction of the audio broadcast is repeated. The reason why the intermittent reproduction is repeated in the tunnel is that confirmation of the same-series station by the PI code collation becomes impossible due to the electric field strength attenuation in the tunnel. That is, the digital broadcasting cannot be demodulated.

In response to the cause, in the radio receiver according to claim 1, as described above, even if there is a broadcast in which the audio broadcast can be reproduced and the digital broadcast cannot be demodulated, the broadcast is intermittently performed twice or more. Since the reproduction of the audio broadcast is not repeated, the listener does not feel a mistake in the tunnel.

In the radio receiver according to the second aspect, when there is a transmission frequency whose electric field strength does not reach a predetermined value in the transmission frequencies of affiliated stations, the electric field strength may not reach a predetermined value at the transmission frequency. It is marked and stored so that it can be identified.

Once the memory is stored, the mute is controlled to tune to the frequency again. That is, the reproduction of the audio broadcast is suppressed, and the audio output of the radio receiver becomes silent.

Therefore, even if there is a broadcast in which the voice broadcast can be reproduced at the transmission frequency of the affiliated station and the electric field strength does not reach the predetermined value, the reproduction of the voice broadcast is intermittently repeated twice or more. Absent.

Here, the predetermined value is the electric field strength required to correctly demodulate the digital broadcast. The predetermined value is separately determined by experiment or calculation.

With respect to the cause, in the radio receiver of claim 2, even if there is a broadcast in which the audio broadcast is reproducible and the electric field strength does not reach a predetermined value, that is,
Even if there is a broadcast in which the audio broadcast can be reproduced but the digital broadcast cannot be demodulated, the audio broadcast will not be intermittently repeated twice or more. Never give.

[0034]

EXAMPLES Next, examples of how the radio receiver according to the present invention is actually embodied will be described. FIG. 2 is a block diagram showing a configuration example of a radio receiver suitable for the present invention.

<< Description of Configuration >>
The signal received by the antenna 10 is input to the tuner circuit 11. In the tuner circuit 11, the frequency-multiplexed audio broadcast signal 40 and digital broadcast signal 41 are separated, and these are output to the audio reproduction circuit 12 and the data demodulation circuit 15, respectively.

FIG. 3A shows the reception characteristic of the tuner circuit 11 for the audio broadcast signal 40. Also, FIG.
(b) shows the reception characteristics of the tuner circuit 11 with respect to the digital broadcast signal 41. In the figure, f _TUNE is a tuning frequency, that is, a reception frequency. As shown in FIG. 2, the reception frequency f _TUNE is output from the port 18.

In the audio reproduction circuit 12, the audio signal for driving the speaker 13 is demodulated from the audio broadcast signal 40 and output to the speaker 13. Then, the speaker 13 reproduces the audio broadcast.

At this time, if the mute control 45 output from the port 14 instructs the mute on, the speaker 13
Drive is suppressed. On the other hand, when the mute control 45 instructs the mute off, the speaker 13 is driven by the audio reproduction circuit 12 and the audio broadcast is reproduced.

In the data demodulation circuit 15, the broadcast data is demodulated from the digital broadcast signal 41, and the port 16
Is output to. The broadcast data includes a PI code and AF list.

In the tuner circuit 11, the electric field strength near the reception frequency f _TUNE is measured. Figure 3
(c) shows the frequency characteristic of the electric field strength measurement in the tuner circuit 11. As shown in FIG. 2, the measured electric field strength 42 is output to the A / D conversion circuit 17, converted into a digital value in the A / D conversion circuit 17, and output to the port 18.

Further, in the tuner circuit 11, it is determined whether or not there is a radio wave having a sufficient electric field strength in the vicinity of the reception frequency f _TUNE . FIG. 3D shows frequency characteristics of the radio wave presence / absence determination in the tuner circuit 11. As shown in FIG. 2, the IFD 43 that is the determination result is
Output to port 18.

The CPU 19 executes the control described later. The control procedure is stored in the ROM 20. R
In the AM 21, a data area required for control executed by the CPU 19, an area for storing an AF list, and a storage area for marking a transmission frequency in the AF list in a distinguishable manner are secured.

CPU 19, ROM 20, RAM 21, port
Data transmission / reception is performed between 14, 16 and 18 via the bus 30 to which they are connected. The mute control 45,
The reception frequency f _TUNE is sent to the CPU 19 via the ports 14 and 18.
Specified by. The digital value of the electric field strength, the IFD 43, and the broadcast data are input to the CPU 19 via the ports 14, 16 and 18.

The result of the listener operating the operation panel 23 is input to the CPU 19 via the port 22 and the bus 30.

<< Explanation of affiliated station storage means >>
.. FIG. 4 is a diagram showing an example of the storage structure of the AF list. The storage area is RA
Secured in M21. PI for one series
An area for storing a code, an area for storing transmission frequencies of affiliated stations, and an area for storing non-PI flags and different PI flags that correspond one-to-one to the transmission frequencies of these affiliated stations are secured.

The storage areas are reserved for N sets corresponding to the preset numbers 1 to N.

<< Explanation of Control Means for Storing Transmission Frequency of Affiliated Station >> The storage area is CP
It is updated under the control of U19. The breakdown of the update is (1)
These are update of different PI flag and non-PI flag by NF control described later, (2) registration of new transmission frequency, and (3) rearrangement of transmission frequency.

First, registration of a new transmission frequency will be described. Now, it is assumed that the listener operates the operation panel 23 to select the preset number 1. When the AF list is demodulated in the data demodulation circuit 15, the A
The F list is read out via the port 16 and temporarily stored in another storage area in the RAM 21. This will be referred to as a primary list.

Next, the transmission frequencies registered in the primary list are compared with the transmission frequencies registered in the preset number 1. If the transmission frequency registered in the primary list is already registered in preset number 1, the transmission frequency is discarded and deleted from the primary list.

On the other hand, the transmission frequency not registered in the preset number 1 is registered in the registration order next to the transmission frequency already registered in the preset number 1. Then, the transmission frequency is deleted from the primary list. At this time, the no-PI flag and the different PI flag corresponding to the transmission frequency are
It is initialized to 0.

However, among the transmission frequencies which are already registered in the preset number 1, if the different PI flag is set to 1, the registration order of those different PI flags is the last and So that there will be no missing numbers in the ranking,
Can be rearranged.

When a new transmission frequency is registered, if the registered transmission frequency is full, the transmission frequency registered in the last registration order is discarded. If the transmission frequency in which the different PI flag is set to 1 is registered, the transmission frequency is discarded. Then, such control is performed until the primary list becomes empty. Even if another preset number is selected,
It is the same.

Next, rearrangement of transmission frequencies will be described. Now, the listener operates the operation panel 23,
Suppose you have selected preset number 1. Then,
By the NF control described later, the electric field strength at each transmission frequency registered in the preset number 1 is recorded in another storage area in the RAM 21.

When the record of the electric field strength in the NF control makes one cycle with respect to the registered transmission frequencies, the record is read and the registration order of the registered transmission frequencies is rearranged in descending order of the electric field strength. To be

However, when there is a transmission frequency in which the different PI flag is set to 1, the registration order of these is the last, and the registration order does not have a missing number.
Can be rearranged. The same is true even if another preset number is selected.

<< Explanation of NF Control >>
... Next, the NF control will be described. FIG. 5 shows N executed by the CPU 19.
It is a flow chart which shows an example of F control. The control is
It is repeatedly executed intermittently. Now, it is assumed that the listener operates the operation panel 23 to select the preset number 1.

If there are a plurality of transmission frequencies registered in the preset number 1, the transmission frequencies to be controlled are circulated according to the registration order every time the control is executed. In other words, it starts from registration number 1 and returns to number 1 when it reaches the end. The transmission frequency to be controlled is tentatively referred to as a target transmission frequency.

An area for recording the electric field strength at each transmission frequency registered in the preset number 1 is secured in another storage area in the RAM 21. Also,
In another storage area in the RAM 21, it is assumed that the transmission frequency of the broadcasting station being received and its electric field strength are recorded.

In step H50, the different PI flag corresponding to the target transmission frequency is examined. If the different PI flag is set to 1, the control ends. On the other hand, if 0, the control shifts to step H51. In step H51, the PI-free flag corresponding to the target transmission frequency is examined.

If the PI-free flag is set to 1,
The control proceeds to step H55. In step H55, the mute control 45 output from the port 14 is set to instruct the mute on. Therefore, the drive of the speaker 13 by the reproduction circuit 12 is suppressed until the mute control 45 is set to instruct the mute off. Then, the control shifts to step H56.

In step H56, the reception frequency f _TUNE output from the port 18 is set to indicate the target transmission frequency. Therefore, the audio broadcast signal received at the target transmission frequency is received from the tuner circuit 11.
40, the digital broadcast signal 41, and the electric field strength 42 and IFD 43 near the target transmission frequency are output. Then, the control shifts to step H57.

On the other hand, in step H51, the non-P
If the I flag is set to 0, the control is in step H52.
Move to. In step H52, the mute on control is executed. Then, the control shifts to step H53. In step H53, the reception frequency changing control to the target transmission frequency is executed, and the control is step H
Move to 54.

In step H54, the mute control 45 output from the port 14 is set to instruct mute off. Therefore, the playback circuit 12 speaker
13 will be driven. Then, the control shifts to step H57.

In step H57, the IFD 43 is read in via the port 18 and tested. If the IFD 43 indicates that a radio wave exists at the reception frequency, the control shifts to step H58.

In step H58, the data demodulation circuit
15 checks whether digital broadcasting can be demodulated. If the broadcast PI code can be read via the port 16, it can be demodulated. If the demodulated PI code can be read, the control shifts to step H59.

In step H59, the PI code stored in the preset No. 1 is compared with the PI code read in step H58. If the collations match, the control shifts to step H60, the different PI flag corresponding to the target transmission frequency is set to 0, and further the control shifts to step H61 to set the non-PI flag corresponding to the target transmission frequency. The flag is also set to 0. Then, the control shifts to step H62.

In step H62, the electric field strength converted into the digital value is read in through the port 18,
It is compared with the electric field strength of the broadcasting station which was being received immediately before the start of the control. If the former is larger, the control shifts to step H71, the mute off control is executed, and the control ends.

On the other hand, if the electric field strength of the broadcasting station which was being received immediately before the start of the control is higher, the control is step H70.
Then, the control of changing the reception frequency to the transmission frequency of the broadcasting station which is being received is executed, and the control is performed in the step H
Move to 71.

The PI in step H59
If the codes do not match, the control shifts to step H63, the different PI flag corresponding to the target transmission frequency is set to 1, and the control shifts to step H70.

Further, in the step H58, the PI
If the code cannot be demodulated, the control shifts to step H64. In step H64, the electric field intensity reading is executed and compared with a predetermined value. The predetermined value is an experiment,
Alternatively, it is a value that is separately determined by calculation and is the minimum value of the electric field strength that can correctly demodulate the digital broadcast.

If the read electric field strength exceeds the predetermined value, the control shifts to step H65, the different PI flag corresponding to the target transmission frequency is set to 1, and the control shifts to step H70. On the other hand, if the read electric field strength does not reach the predetermined value, the control shifts to step H66, the PI-free flag corresponding to the target transmission frequency is set to 1, and the control shifts to step H70.

The IF in step H57
If D43 indicates that there is no radio wave at the reception frequency, the control shifts to step H67, and the electric field strength is compared with the predetermined value.

If the read electric field strength exceeds the predetermined value, the control shifts to step H69, the different PI flag corresponding to the target transmission frequency is set to 1, and the control shifts to step H70. On the other hand, if the read electric field strength does not reach the predetermined value, the control shifts to step H68, the PI-free flag corresponding to the target transmission frequency is set to 1, and the control shifts to step H70. Such control is similarly performed even if another preset number is selected.

<< Explanation of Action of NF Control According to the Present Invention >> Next, by taking a specific situation as an example, what action the NF control has will be described. explain. Assume that the radio receiver is installed in a vehicle and the vehicle enters a long tunnel. Figure 6 (a)
[Fig. 4] is a graph showing electric field strength of broadcasting in a tunnel.

In the figure, S ₀ is the electric field strength required to demodulate the digital broadcast without error. Since the electric field strength of broadcasting station A is significantly attenuated in the tunnel,
Even if I tune in, only noise is played back.

On the other hand, the electric field strength of the broadcasting station B is attenuated to such an extent that the digital broadcasting cannot be demodulated in the tunnel, but the electric field strength is stronger than that of the broadcasting station A, and if tuning is performed, noise is generated. The audio broadcast mixed with is played.

It is assumed that the broadcasting stations A and B are affiliated stations and were receiving the broadcasting station A before entering the tunnel. Before entering the tunnel, both the broadcasting station A and the broadcasting station B can demodulate the digital broadcasting.

According to the NF control of the radio receiver,
Under the circumstances, both the non-PI flags corresponding to the broadcasting station A and the broadcasting station B are 0 until entering the tunnel.
Is set to. Until the tunnel is entered, both the broadcasting station A and the broadcasting station B have sufficient electric field strengths for demodulating the digital broadcasting, and the steps H50, H51, H52, H53, H54, H57, H58, H59, H
This is because step H61 is executed through 60.

When entering the tunnel, the electric field strength of the broadcasting station A is significantly attenuated, so that noise is reproduced from the radio receiver as shown in FIGS. 6B and 6A. Then, the N executed first for the broadcasting station B after entering the tunnel
In the F control, since the electric field strength is attenuated and the digital broadcasting cannot be demodulated, the steps H50, H51, H52, H
53, H54, H57, H58, H64, and the above step H66
Is executed.

Therefore, there is no PI corresponding to the broadcasting station B.
The flag is set to 1. Then, the step H70,
H71 is executed and the reception frequency of the radio receiver is returned to the broadcasting station A. During the control period, as shown in FIGS. 6B and 6A, the audio broadcast of the broadcasting station B is reproduced. That is, the audio broadcast mixed with noise is reproduced. And
As shown in FIGS. 6B and 6C, the audio broadcast of the broadcast station A is reproduced again. That is, noise is reproduced.

On the other hand, in the NF control executed for the broadcasting station B from the second time onward, the PI-free flag is set to 1
Since it is set to, the above steps H50, H51, H5
5, H56, H57, H58, H64, H66, H70, H71 are executed.

At this time, before the reception frequency is changed to the broadcast station B in step H56, the mute-on control is performed in step H55.
In step H70, the reception frequency is the broadcasting station A.
Then, in step H71, the mute-off control is performed.

Therefore, in the control period, as shown in FIG.
As shown in (b), (d), (f), ..., Even when the broadcasting station B is being received, the audio reproduction of the radio receiver is in the silent state. Then, as shown in FIGS. 6B, 6E, 6C, ..., The audio broadcast of the broadcasting station A is reproduced again. That is,
The noise is played.

Thus, in the radio receiver,
Even if there is a broadcast such as the broadcast station B in which the audio broadcast can be reproduced and the digital broadcast cannot be demodulated, the reproduction of the audio broadcast is not repeated intermittently twice or more.

[0085]

As described above, according to the radio receiver of the present invention, even if there is a broadcast in which the audio broadcast can be reproduced and the digital broadcast cannot be demodulated, the audio broadcast is intermittently transmitted twice or more. Since the structure is such that the reproduction is not repeated, unlike the conventional case, the reproduction of the audio broadcast is no longer repeated intermittently in the tunnel.

Since the reproduction of the audio broadcast is no longer repeated intermittently in the tunnel, the listener is not given a feeling of mischange in the tunnel.

According to the radio receiver of the second aspect, as described above, even if there is a broadcast in which the voice broadcast is reproducible and the electric field strength does not reach the predetermined value, the voice broadcast is intermittently performed twice or more. Since the structure is such that the reproduction is not repeated, unlike the conventional case, the reproduction of the audio broadcast is no longer repeated intermittently in the tunnel.

Since the reproduction of the audio broadcast is not repeated intermittently in the tunnel, the listener is not given a feeling of mischange in the tunnel.

[Brief description of drawings]

FIG. 1 is a block diagram showing the basic principle of the present invention.

FIG. 2 is a block diagram showing an embodiment of the present invention.

FIG. 3 is a graph showing reception characteristics of a tuner circuit suitable for the present invention.

FIG. 4 is a diagram showing a storage structure of an AF list suitable for the present invention.

FIG. 5 is a flowchart showing NF control suitable for the present invention.

FIG. 6 is a diagram illustrating the operation of the present invention.

FIG. 7 is a flowchart illustrating conventional NF control.

FIG. 8 is a diagram illustrating a problem in conventional NF control.

[Explanation of symbols]

1 tuning means 2 audio reproduction means 3 data demodulation means 4 control means 5 affiliated station storage means 10 antenna 11 tuner circuit 12 audio reproduction circuit 13 speaker 14 port 15 data demodulation circuit 16 port 17 A / D converter 18 port 19 CPU 20 ROM 21 RAM 22 Port 23 Operation panel 30 Bus 40 Audio broadcasting signal 41 Digital broadcasting signal 42 Electric field strength 43 IFD f _TUNE Reception frequency 45 Mute control

Claims (2)

[Claims] 1. Tuning means (1) for receiving a radio wave and outputting a detection signal and an electric field strength in the vicinity of the tuning frequency in synchronization with a frequency designated by the control means (4); and the tuning means (1). Audio reproduction means (2) for reproducing an audio broadcast from the output detection signal, data demodulation means (3) for demodulating a digital broadcast from the detection signal output by the tuning means (1), and the data demodulation means (3) The transmission frequency of the same-series station broadcast by the digital broadcasting demodulated by is intermittently designated to the tuning means (1), and the tuning means (1)
A radio receiver having a control means (4) for investigating the electric field strength output by the audio reproduction means (2), wherein the audio reproduction means (2) is capable of mute control by the control means (4). It has an affiliated station storage means (5) having a storage area for storing transmission frequencies of affiliated stations and a storage area for marking those transmission frequencies in an identifiable manner, and the control means (4) is for the data demodulation means ( Means for storing the transmission frequency of the same affiliated station demodulated by 3) in the affiliated station storage means (5), and marking those in which the digital broadcast cannot be demodulated among those transmission frequencies in an identifiable manner. A means for storing in the station storage means (5) and a means for designating mute-on in the sound reproducing means (2) prior to designating the marked transmission frequency in the tuning means (1). Radio characterized by having Receiving machine. 2. Tuning means (1) for receiving a radio wave and outputting a detection signal and an electric field strength near the tuning frequency in synchronization with a frequency designated by the control means (4); and the tuning means (1). Audio reproduction means (2) for reproducing an audio broadcast from the output detection signal, data demodulation means (3) for demodulating a digital broadcast from the detection signal output by the tuning means (1), and the data demodulation means (3) The transmission frequency of the same-series station broadcast by the digital broadcasting demodulated by is intermittently designated to the tuning means (1), and the tuning means (1)
A radio receiver having a control means (4) for investigating the electric field strength output by the audio reproduction means (2), wherein the audio reproduction means (2) is capable of mute control by the control means (4). It has an affiliated station storage means (5) having a storage area for storing transmission frequencies of affiliated stations and a storage area for marking those transmission frequencies in an identifiable manner, and the control means (4) is for the data demodulation means ( Means for storing in the affiliated station storage means (5) the transmission frequency of the same affiliated station demodulated by 3), and the electric field strength output from the tuning means (1) among the transmission frequencies does not reach a predetermined value Means for storing in the affiliated station storage means (5) so as to be identifiable, and the voice reproduction means (2) prior to designating the marked transmission frequency in the tuning means (1). Means to specify mute on Radio receiver, characterized by.