WO2013057801A1

WO2013057801A1 - Receiver apparatus, reception method, reception program, and recording medium having stored reception program thereon

Info

Publication number: WO2013057801A1
Application number: PCT/JP2011/074030
Authority: WO
Inventors: 坪井　善美
Original assignee: パイオニア株式会社
Priority date: 2011-10-19
Filing date: 2011-10-19
Publication date: 2013-04-25

Abstract

[Problem] To provide a receiver apparatus, a reception method, a reception program and a recording medium having stored the reception program thereon that can concurrently satisfy both a condition of desiring to preferentially stop a seek operation and receive a broadcast even if reception state is a little bad and a condition of desiring to consider reception state (reception quality) and that further can determine a broadcast content on either of the conditions. [Solution] A microcomputer (15) of a receiver apparatus (1) is provided with a weighting table (15a) in which the priority levels of broadcast stations the frequencies of which can be received are specified by establishing S-meter signal levels and noise amount threshold values for the frequencies of the broadcast stations, while a reception state control circuit (8) for changing the sound quality such that received program contents can be heard is provided at the stage following a detector circuit (7).

Description

Reception device, reception method, reception program, and recording medium storing reception program

The present invention relates to a receiving device that receives radio waves transmitted from a broadcasting station, a receiving method, a receiving program, and a recording medium that stores the receiving program.

For example, in a receiving apparatus that receives a radio broadcast or the like, when selecting a broadcast station that is desired to receive, a method of directly specifying the frequency of the broadcast station and a seek operation that automatically searches for a receivable broadcast station are performed. There is a way to tune in.

FIG. 1 shows a configuration of a receiving apparatus 101 that receives a conventional radio broadcast. The receiving apparatus 101 illustrated in FIG. 1 includes an antenna 102, an RF amplifier circuit 103, a front end 104, a PLL unit 105, an intermediate frequency amplifier circuit 106, a detection circuit 107, a mute circuit 108, and a high cut circuit 109. A stereo separation circuit 110, an audio amplifier 111, a speaker 112, an S meter detection circuit 113, a noise detection circuit 114, and a microcomputer 115.

The RF amplification circuit 103 performs high frequency amplification of the signal received by the antenna 102 and outputs the amplified signal to the front end 104.

The front end 104 converts the received signal input from the RF amplifier circuit 103 from a carrier frequency to a constant frequency (intermediate frequency) using the local oscillation signal from the PLL unit 105 and outputs the converted signal to the intermediate frequency amplifier circuit 106. .

The PLL unit 105 is a phase synchronization circuit, and outputs a local oscillation signal for converting a received signal to an intermediate frequency to the front end 104 according to an instruction from the microcomputer 115.

The intermediate frequency amplification circuit 106 amplifies the signal converted to the intermediate frequency by the front end 104 to a level that can be demodulated by the detection circuit 107 and outputs the amplified signal to the detection circuit 107.

The detection circuit 107 demodulates the intermediate frequency signal input from the intermediate frequency amplifier circuit 106 into an audio signal and outputs the audio signal to the mute circuit 108.

The mute circuit 108 outputs the audio signal demodulated by the detection circuit 107 to the high cut circuit 109 so as to attenuate the signal level.

The high cut circuit 109 outputs the audio signal input from the mute circuit 108 to the stereo separation circuit 110 so as to attenuate the signal level equal to or higher than a preset frequency.

The stereo separation circuit 110 separates the audio signal input from the high cut circuit 109 into a right channel (Rch) and a left channel (Lch), and outputs the separated signal to the audio amplifier 111.

The audio amplifier 111 amplifies each of the audio signals separated into Rch and Lch in the stereo separation circuit 110 to a predetermined level. The sound signal amplified by the audio amplifier 111 is output from the speaker 112 as sound.

The S meter detection circuit 113 generates an S meter signal that is a signal representing the electric field strength of the signal received from the intermediate frequency signal input to the intermediate frequency amplifier circuit 106 and outputs the S meter signal to the microcomputer 115.

The noise detection circuit 114 detects the amount of noise (noise level) from the audio signal demodulated by the detection circuit 107 and outputs it to the microcomputer 115.

The microcomputer 115 is a microcomputer incorporating a CPU, a memory, and the like (not shown). The microcomputer 115 controls the entire receiving apparatus 101 and outputs a local oscillation signal for converting the carrier wave frequency of the received signal to an intermediate frequency to the PLL unit 105. Instruct.

In the seek operation of the receiving apparatus 101 shown in FIG. 1, the microcomputer 115 instructs the PLL unit 105 to change the local oscillation signal frequency, and the output of the S meter signal detected by the S meter detection circuit 113 is above a certain level. In addition, when the amount of noise detected by the noise detection circuit 114 is below a certain level, the local oscillation signal frequency change is stopped, and the carrier wave corresponding to the stopped local oscillation signal is converted to an intermediate frequency and amplified. Then, the signal is detected and demodulated into an audio signal. That is, when a predetermined threshold value of the S meter signal and a threshold value of the noise amount are satisfied, seek stop is performed and the frequency is received. When the seek-stopped frequency is not the broadcast station that desires reception, the seek operation is performed again, and the operation is repeated until the broadcast station that desires reception is received.

In the receiving apparatus 101 configured as described above, when a channel is selected by a seek operation, for example, if a threshold is set so as to receive a broadcasting station with a good reception state, there is a broadcasting station that the user wants to receive preferentially. If the reception status of the broadcasting station is poor, the seek operation may not stop and channel selection may not be possible. In such a case, by lowering the threshold level of the S meter signal and raising the threshold of the noise amount, reception is possible even if the reception state is somewhat bad, but this time the reception conditions of other broadcast stations are also the same. Therefore, when there is a broadcast station that wants to receive only when the reception state is good, the seek operation stops even if the broadcast station also has a bad reception state. Therefore, it is difficult for the receiving apparatus 101 having the conventional configuration to simultaneously satisfy the condition of preferentially stopping the seek operation even if the reception state is somewhat poor and the condition of emphasizing the reception state (reception quality). Met.

In the case of the receiving apparatus 101 shown in FIG. 1, the sound quality of the demodulated audio signal is adjusted by the mute circuit 108 and the high cut circuit 109. The adjustment value differs depending on whether the state (reception quality) is important. However, at present, the adjustment value is set to any one of them. For this reason, when a broadcast station with a bad reception state is received with a setting adapted to the case where the reception state (reception quality) is important, for example, the sound is reduced more than necessary by the mute circuit 108, or the sound is blocked by the high cut circuit 109. There is a problem that it becomes difficult to distinguish the contents of the program being broadcast.

Here, Patent Document 1 describes a character broadcast receiving apparatus that, when a weak radio wave having a predetermined intensity or less is detected, determines that a local character information program is received by a local broadcast station and receives the program. . That is, it describes that a specific broadcasting station with weak radio waves (poor reception state) is detected and received.

JP-A-5-300483

However, in the case of the teletext receiving device described in Patent Document 1, the local broadcast station is detected by detecting weak radio waves with a predetermined intensity or less. For example, if the local broadcast station is near the transmitting station, the local broadcast station is weak. Therefore, a weak radio station is not necessarily a local broadcast station. Therefore, even if the technique of Patent Document 1 is used, the condition that the seek operation should be stopped preferentially even if the reception state is somewhat bad and the condition that the reception state (reception quality) is important are simultaneously satisfied. Not necessarily.

Further, in the case of the teletext receiving device described in Patent Document 1, there is no mention of a circuit that adjusts the sound quality of received signals such as the mute circuit 108, the high cut circuit 109, and the stereo separation circuit 110 depending on the reception state. .

Therefore, the present invention can simultaneously satisfy, for example, the condition that the seek operation is stopped preferentially even if the reception state is somewhat bad and the condition that the reception state (reception quality) is important. It is an object of the present invention to provide a receiving apparatus, a receiving method, a receiving program, and a recording medium storing the receiving program that can determine broadcast contents even under the above conditions.

In order to solve the above-described problem, the receiving device according to claim 1 includes a receiving unit that receives radio waves, an input signal converted from the radio waves received by the receiving unit, and a threshold value set in the input signal. And a reception control means for performing a seek operation for searching for broadcast waves from a broadcast station, the priority order is defined for receivable broadcast stations, and the threshold value is set for each priority order. A table storage unit storing a weighting table, and a sound quality control unit that changes a sound quality of an audio signal included in the input signal received by the reception unit, wherein the reception control unit includes the weighting table. The sound quality is changed so that the program operation in the audio signal can be heard by the sound quality control means based on the seek operation.

The reception method according to claim 9 includes a reception control step of receiving a radio wave and performing a seek operation for searching for a broadcast wave from a broadcast station based on the received input signal and a threshold set in the input signal. In the reception method, the reception control step performs the seek operation based on a weighting table that defines priority levels for receivable broadcasting stations and sets the threshold value for each priority level, and the input The sound quality is changed so that the program content in the audio signal included in the signal can be heard.

A receiving program according to claim 10 is a program for receiving a computer from a broadcasting station based on an input signal received by the receiving means and a threshold set in the input signal. In a reception program that functions as a reception control means that performs a seek operation for searching for broadcast waves, a weighting table that defines priority levels for receivable broadcast stations and sets the threshold value for each priority level is stored. The computer functions as a table storage means and a sound quality control means for changing the sound quality of an audio signal included in the input signal received by the reception means, and the reception control means is based on the weighting table, The sound quality is such that the contents of the program in the audio signal can be heard by the sound quality control means while performing the seek operation. It is characterized by varying.

It is the block diagram explaining the structure of the receiver concerning a prior art. It is the block diagram explaining the structure of the receiver concerning 1st Example of this invention. It is the table | surface which showed the example of the weighting table shown by FIG. 3 is a flowchart illustrating a seek operation of the receiving apparatus illustrated in FIG. 2. 3 is a graph for explaining the operation of the mute circuit shown in FIG. 2. 3 is a graph for explaining the operation of the high cut circuit shown in FIG. 2. 3 is a graph for explaining the operation of the stereo separation circuit shown in FIG. 2. It is the block diagram explaining the structure of the receiver concerning 2nd Example of this invention. It is the flowchart which showed the priority order change operation | movement of the broadcasting station of the receiver shown by FIG. It is the block diagram explaining the structure of the receiver concerning 3rd Example of this invention. 11 is a graph for explaining the operation of the audio filter circuit shown in FIG. 10.

Hereinafter, a receiving apparatus according to an embodiment of the present invention will be described. In the receiving apparatus according to an embodiment of the present invention, the reception control unit performs a seek operation based on a weighting table in which priority levels are defined for receivable broadcasting stations and threshold values are set for the priority levels. At the same time, the sound quality control means changes the sound quality so that the contents of the program in the audio signal can be listened to. By setting a threshold value for each broadcasting station in a condition that importance is placed on (quality), two conditions can be satisfied simultaneously. Also, in order to change the sound quality so that the sound quality control means can listen to the program content in the audio signal, even if the reception condition is somewhat bad, the condition that the seek operation should be stopped preferentially and reception should be emphasized The broadcast content can be discriminated under either condition of the condition of wanting to do.

In addition, a field strength detecting means for detecting the field strength of the radio wave is provided, and the weighting table has a threshold set so that the field strength detected by the field strength detecting means becomes weaker as the priority becomes higher, and the reception control means. May perform a seek operation based on the electric field intensity detected by the electric field intensity detecting means and the weighting table, and change the sound quality so that the sound quality control means can listen to the program contents in the audio signal. In this way, the condition that the seek operation should be stopped preferentially even if the reception state is somewhat poor and the condition that the reception state (reception quality) is to be emphasized are specified by the weighting table by the electric field strength. In addition, a broadcast station having a high priority has a low electric field strength. That is, even if the reception state is somewhat poor, it is possible to receive the signal with a priority stop.

In addition, a noise amount detecting means for detecting the noise amount of the radio wave is provided, and the threshold is set so that the noise amount detected by the noise amount detecting means increases as the priority is increased, and the reception control means May perform a seek operation based on the noise amount detected by the noise amount detection means and the weighting table, and may change the sound quality so that the sound quality control means can listen to the program content in the audio signal. By doing this, the condition that the seek operation should be stopped preferentially even if the reception state is somewhat bad and the condition that the reception state (reception quality) should be emphasized are specified by the weighting table by the amount of noise. In addition, a broadcast station with a high priority has a large amount of noise, that is, even if the reception state is somewhat poor, the seek can be received with priority stopped.

The reception control means is included in the audio signal even when the electric field intensity detected by the electric field intensity detection means is weak or the noise amount detected by the noise amount detection means is large as the priority of the weighting table increases. The sound quality may be changed so that the program content can be heard. By doing so, broadcast stations with high priority can receive by stopping the seek operation preferentially even if the reception state is somewhat bad, and change the sound quality to match the bad reception state. Can do.

Further, a reception frequency calculation unit that calculates the reception frequency of a receivable broadcast station, and a priority order change unit that changes the priority order of the weighting table of the broadcast station based on the reception frequency calculated by the reception frequency calculation unit; Therefore, the weighting table can be changed according to the reception frequency of the user, and the seek operation can be preferentially stopped and received for the broadcasting station that the user often listens to.

The reception means includes a genre acquisition means for acquiring the genre of the program being received, the reception frequency calculation means calculates the reception frequency of the genre acquired by the genre acquisition means, and the priority changing means calculates the reception frequency. Based on the reception frequency of the genre calculated by the means, the priority order of the broadcasting stations broadcasting the program related to the genre in the weighting table may be changed. In this way, the weighting table can be changed in consideration of the genre of the program, so that the seek operation can be preferentially stopped and received for a broadcasting station that matches the user's preference.

The sound quality control means includes a signal level attenuation means for attenuating the audio signal level, a high-frequency attenuation means for attenuating a signal component of a predetermined frequency or higher included in the audio signal, and stereo separation for changing the stereo separation degree of the audio signal. At least one or more of the degree changing means may be provided. In this way, the sound quality can be adjusted by changing the audio signal in accordance with the electric field strength and the amount of noise.

Further, the sound quality control means may include bandwidth changing means for changing the frequency bandwidth included in the audio signal based on the genre acquired by the genre acquisition means. By doing in this way, it is possible to control so that the audio of the bandwidth suitable for the program being broadcast can be heard at a minimum.

The receiving method according to an embodiment of the present invention includes a seek operation based on a weighting table in which a priority order is defined for receivable broadcasting stations and a threshold value is set for each priority order in the reception control step. Since the sound quality is changed so that the contents of the program in the audio signal included in the input signal can be listened to, the broadcasting station with the condition that it wants to receive it preferentially even if the reception condition is somewhat bad during seek operation, By setting a threshold value for each broadcasting station with the condition that the state (reception quality) is important, two conditions can be satisfied simultaneously. Also, in order to change the sound quality so that the sound quality control means can listen to the program content in the audio signal, even if the reception condition is somewhat bad, the condition that the seek operation should be stopped preferentially and reception should be emphasized The broadcast content can be discriminated under either condition of the condition of wanting to do.

In addition, the reception program according to the embodiment of the present invention is configured to perform a seek operation based on a weighting table in which the reception control unit defines priority levels for receivable broadcast stations and sets a threshold value for each priority level. Since the sound quality is changed so that the sound quality control means can listen to the program content in the audio signal, the broadcasting station with the condition that it wants to receive preferentially even if the reception condition is somewhat bad during seek operation, and the reception condition By setting a threshold value for each broadcasting station with a condition that (reception quality) is important, two conditions can be satisfied simultaneously. Also, in order to change the sound quality so that the sound quality control means can listen to the program content in the audio signal, even if the reception condition is somewhat bad, the condition that the seek operation should be stopped preferentially and reception should be emphasized The broadcast content can be discriminated under either condition of the condition of wanting to do.

Further, the reception program described above may be stored in a computer-readable recording medium. In this way, the program can be distributed as a single unit in addition to being incorporated in the device, and version upgrades can be easily performed.

A receiving apparatus 1 as a receiving apparatus according to the first embodiment of the present invention will be described with reference to FIGS. The receiving apparatus 1 includes an antenna 2, an RF amplifier circuit 3, a front end 4, a PLL unit 5, an intermediate frequency amplifier circuit 6, a detection circuit 7, a reception state control circuit 8, an audio amplifier 11, and a speaker. 12, an S meter detection circuit 13, a noise detection circuit 14, and a microcomputer 15, for example, a device that is attached to a vehicle and receives a radio broadcast.

The RF amplifier circuit 3 performs high frequency amplification of the input signal converted from the radio wave received by the antenna 2 and outputs it to the front end 4.

The front end 4 converts the input signal input from the RF amplifier circuit 3 from the frequency of the carrier wave to a constant frequency (intermediate frequency) using the local oscillation signal from the PLL unit 5, and outputs it to the intermediate frequency amplifier circuit 6. .

The PLL unit 5 is a phase synchronization circuit, and outputs a local oscillation signal for converting a received signal of a desired station to an intermediate frequency to the front end 4 according to an instruction from the microcomputer 15.

The intermediate frequency amplification circuit 6 amplifies the signal converted to the intermediate frequency by the front end 4 to a level that can be demodulated by the detection circuit 7 and outputs the amplified signal to the detection circuit 7.

The detection circuit 7 demodulates the intermediate frequency signal input from the intermediate frequency amplifier circuit 6 into an audio signal and outputs it to the reception state control circuit 8. The antenna 2, the RF amplifier circuit 3, the front end 4, the PLL unit 5, the intermediate frequency amplifier circuit 6, and the detection circuit 7 constitute reception means for receiving radio waves.

The reception state control circuit 8 as sound quality control means includes a mute circuit 8a, a high cut circuit 8b, a stereo separation circuit 8c, and a control circuit 8d.

The mute circuit 8a as signal level attenuation means outputs the audio signal demodulated by the detection circuit 7 to the high cut circuit 8b so as to attenuate (mute) the signal level based on an instruction from the control circuit 8d. .

The high cut circuit 8b as a high frequency attenuating means attenuates (high cuts) a signal level of a predetermined frequency or more included in the audio signal based on an instruction from the control circuit 8d with respect to the audio signal input from the mute circuit 8a. In this way, the signal is output to the stereo separation circuit 8c.

The stereo separation circuit 8c as the stereo separation degree changing means separates the audio signal input from the high cut circuit 8b into a right channel (Rch) and a left channel (Lch) and outputs the separated signal to the audio amplifier 11. In the stereo separation circuit 8c, the stereo separation degree is changed by an instruction from the control circuit 8d.

The control circuit 8d controls the mute circuit 8a, the high cut circuit 8b, and the stereo separation circuit 8c based on the detection result of the S meter detection circuit 13, the noise detection circuit 14, and the instruction from the microcomputer 15.

The audio amplifier 11 amplifies the audio signals separated into Rch and Lch in the reception state control circuit 8 (stereo separation circuit 8c) to respective predetermined levels. The audio signal amplified by the audio amplifier 11 is output from the speaker 12 as audio.

The S meter detection circuit 13 as the electric field strength detection means generates an S meter signal that is a signal representing the electric field strength of the signal received from the intermediate frequency signal input to the intermediate frequency amplification circuit 6 and outputs it to the microcomputer 15. That is, the electric field strength of the radio wave is detected.

The noise detection circuit 14 as noise amount detection means detects the noise amount (noise level) of the audio signal demodulated by the detection circuit 7 and outputs it to the microcomputer 15. That is, the amount of radio wave noise is detected.

A microcomputer 15 as a table storage means and a reception control means is a microcomputer incorporating a CPU and a memory (not shown), and controls the entire receiving apparatus 1 and local oscillation for converting the carrier wave frequency of the received radio wave into an intermediate frequency. Instructs the PLL unit 5 to output a signal. Further, the microcomputer 15 instructs the reception state control circuit 8 to change a reception state control amount described later based on a weighting table 15a described later.

The microcomputer 15 includes a weighting table 15a. The weighting table 15a is stored in, for example, the memory of the microcomputer 15, and the weighting table 15a provides a priority for each frequency and broadcast content as shown in FIG. 3, for example. The threshold of (electric field strength) is set low and the threshold of noise amount is set low, so that the broadcast can be listened to even in a weak electric field and more noisy state. That is, priority levels are defined for receivable broadcast stations, and electric field strength and noise amount threshold values are set as threshold values set for input signals converted from radio waves for each priority level.

The contents of the example of the weighting table 15a shown in FIG. 3 will be described. FIG. 3 is an example of the Kingdom of Thailand. The frequency indicates the frequency of the broadcasting station, and the asterisk indicates an arbitrary number. That is, in the case of FIG. 3, the frequencies are classified into three types: 00, 50, 25, and 75 having two decimal places.

Broadcast contents are categorized into nationally-certified stations for government / military / commercial general, local official stations for government / military / commercial general, and community broadcast. In the case of FIG. 3, two decimal places of the frequency are determined in advance according to the broadcast content, and the broadcast content can be determined by the frequency.

The priorities are ranked so as to preferentially receive broadcast stations that can be received even in a weak electric field, that is, that can be received even in a poor reception state. In other words, the higher the priority is, the more the signal can be received even in a state where there are more weak electric fields and noise. The S meter signal indicates the threshold value of the S meter signal level for stopping the seek operation. The lower the value, the more the seek operation stops even with a weak electric field. The noise amount threshold value indicates a noise amount threshold value for stopping the seek operation. When the threshold value is low, the noise amount threshold value is stopped even when there is a lot of noise, and when it is high, the noise amount threshold value is stopped. In short, in FIG. 3, the threshold is set so that the seek operation stops in a state where the S meter signal level is small and the amount of noise is large as the priority becomes higher.

Note that the above example is an example of the Kingdom of Thailand, and classification is not limited to this. For example, in the case of Japan, it is not possible to classify with two digits after the decimal point of the frequency, so all the digits of the frequency of each broadcasting station may be listed (for example, for AM broadcasting, 594 kHz and 693 kHz are priorities 1, 954 kHz, 1134 kHz. Priority 2 etc.). Of course, it goes without saying that the number of priorities is not limited to three.

Further, the weighting table 15a is not limited to being stored in the microcomputer 15, but may be stored in an external memory or the like accessible by the microcomputer 15. In the weighting table 15a, a threshold value for only one of the S meter signal and the noise amount may be set, but setting both threshold values is preferable because finer control is possible.

Next, the operation of the receiving apparatus 1 shown in FIG. 2 will be described with reference to the flowchart shown in FIG. The flowchart shown in FIG.

First, in step S101, a seek operation is started (SEEK START), and the process proceeds to step S102. That is, the operation of changing the frequency of the local oscillation signal of the PLL unit 5 from the current frequency is started.

Next, in step S102, the frequency is set and the process proceeds to step S103. This frequency indicates a frequency obtained by adding a predetermined value such as several kHz or several MHz from the frequency started in step S101 or the frequency returned from step S106, and the priority order, that is, the threshold value needs to be changed in subsequent steps. It is a frequency for judging whether or not. At the time of this step, the receiving means from the antenna 2 to the detection circuit 7 operate, and the S meter detection circuit 13 and the noise detection circuit 14 also detect the S meter signal level and the noise amount, respectively. That is, a reception step, an electric field strength detection step, and a noise detection step are performed.

Next, in step S103, the process proceeds to step S104 with reference to the weighting table 15a.

Next, in step S104 as the reception control step, it is determined from the weighting table 15a whether or not the frequency set in step S102 needs to be changed in the seek sensitivity and the reception state control amount. If YES in step S105, the process advances to step S105. If NO (NO), the process advances to step S106. That is, with reference to the frequency set in the weighting table 15a, it is determined whether the frequency set in step S102 is applicable or, if applicable, which priority order is applicable. The seek sensitivity indicates both the S meter signal (electric field strength) detected by the S meter detection circuit 13 and the noise amount detected by the noise detection circuit 14, and the reception state control amounts include the mute circuit 8a and the high cut circuit. 8b shows the control amount of the stereo separation circuit 8c.

Next, in step S105 as a reception control step, the seek sensitivity and the reception state control amount are changed according to the weighting table 15a, and the process proceeds to step S106.

When the seek sensitivity is low in step S105, for example, when the priority is changed from 2 to 1 in FIG. 3, the threshold value of the S meter signal level detected by the S meter detection circuit 13 becomes small, and the PLL unit 5 becomes weaker in electric field. The change of the local oscillation signal to is stopped. Further, the threshold value is changed to a state where the amount of noise detected by the noise detection circuit 14 is large. When the threshold values of the electric field strength and the noise amount are changed, the reception state control circuit 8 is caused to change the reception state control amount.

When the reception state control amount is changed, that is, when the priority is changed to a different priority order from the current state, the threshold value of the S meter signal level and the noise amount threshold value (low, (Default, high) is output to the control circuit 8d of the reception state control circuit 8. The control circuit 8d includes a threshold value for the S meter signal level and a threshold value for the noise amount, an actual S meter signal value detected by the S meter detection circuit 13, and an actual noise amount detected by the noise detection circuit 14. Based on this, the control of the mute circuit 8a, the high cut circuit 8b, and the stereo separation circuit 8c is switched. Control switching of the mute circuit 8a, the high cut circuit 8b, and the stereo separation circuit 8c will be described with reference to FIGS.

For the mute circuit 8a, as shown in FIG. 5, as the priority increases, the output level characteristic with respect to the electric field strength is changed in the direction of the arrow in the drawing, that is, the electric field strength (attenuating the signal level) S meter signal level) is reduced. That is, switching is performed so that the electric field strength is muted in a weaker direction.

For the high cut circuit 8b, as shown in FIG. 6, as the priority increases, the characteristics of the output level with respect to the electric field strength are changed in the direction of the arrow in the figure, that is, a predetermined frequency (10 kHz in FIG. 6). The electric field intensity (S meter signal level) that attenuates the above signal level is reduced. That is, switching is performed so that the high cut is performed in a direction in which the electric field strength is weaker.

For the stereo separation circuit 8c, as shown in FIG. 7, as the priority increases, the output level characteristic with respect to the electric field strength is changed in the direction of the arrow in the drawing, that is, the electric field that lowers the stereo separation degree. Reduce intensity (S meter signal level). That is, switching is performed so that stereo separation is performed in a direction where the electric field strength is weaker.

By switching the control of the mute circuit 8a, the high cut circuit 8b, and the stereo separation circuit 8c, for example, when the priority is changed from 2 to 1 in FIG. Can be heard (can be distinguished). For example, the mute circuit 8a moves in a direction in which the electric field intensity at which the mute operates is weaker, thereby preventing the received broadcast station sound from becoming unnecessarily small when the electric field intensity is weak, and the high cut circuit 8b. The direction in which the electric field intensity at which the signal operates operates in a direction in which the electric field strength is weaker, thereby preventing the sound of the broadcast content from being cut together with the noise and condensing the sound. By moving to, you can listen to the broadcast in stereo down to a weaker electric field. That is, the sound quality is changed so that the program content can be heard even when the electric field strength is weak and the amount of noise is large.

Returning to the flowchart of FIG. 4, in step S106, it is determined whether or not the seek sensitivity is equal to or higher. If the seek sensitivity is equal to or higher (in the case of Yes), the process proceeds to step S107. The process returns to step S102. That is, if it is equal to or higher than the seek sensitivity, it is determined that the frequency is in the state of receiving some broadcasting station, and the process proceeds to step S107. If not higher than the seek sensitivity, the frequency is not in a state of receiving the broadcasting station. Returning to step S102, the frequency is changed and step S102 and subsequent steps are executed again.

Next, in step S107, the seek operation is stopped and the frequency is received.

According to this embodiment, the microcomputer 15 of the receiving apparatus 1 is provided with the weighting table 15a that provides the S meter signal level and the noise amount threshold to the frequency of the receivable broadcasting station and defines the priority order of each broadcasting station. And a reception state control circuit 8 for changing the sound quality so that the received broadcast wave can be heard. As the priority of the weighting table 15a increases, a threshold is set in a direction where the S meter signal level is small and the amount of noise is large, and the reception state control circuit 8 increases the priority of the weighting table 15a. Accordingly, the mute circuit 8a, the high cut circuit 8b, and the stereo separation circuit 8c are controlled so that the program content can be heard even if the S meter signal detected by the S meter detection circuit 13 is small and the noise amount detected by the noise detection circuit 14 is large. Therefore, the weighting table 15a can prescribe and satisfy the condition that the seek operation should be stopped preferentially even if the reception state is somewhat bad and the condition that the reception state (reception quality) is important. it can. In addition, in order to change the sound quality so that the reception state control circuit 8 can listen to the program content in the audio signal, even if the reception state is somewhat bad, the condition that the seek operation should be stopped and reception preferentially received, and the reception state The broadcast contents can be discriminated under either of the conditions that the user wants to focus on.

In the above-described embodiment, the reception state control circuit 8 includes the mute circuit 8a, the high cut circuit 8b, and the stereo separation circuit 8c. However, the present invention is not limited to this, and it is only necessary to include at least one. However, it is preferable to provide all of them because the sound quality can be adjusted more easily.

In the above-described embodiment, when the priority of the weighting table 15a is changed, the threshold values of both the S meter signal level and the noise amount are changed. However, only one of them may be changed.

Next, a receiving apparatus 1 according to a second embodiment of the present invention will be described with reference to FIGS. The same parts as those in the first embodiment described above are denoted by the same reference numerals and description thereof is omitted.

FIG. 8 shows the configuration of the receiving device 1 of this embodiment. The receiving apparatus 1 of the present embodiment is different from the first embodiment in that an RBDS decoder 16 is added to the configuration of FIG. The RBDS decoder 16 is a circuit that decodes digital multiplexed data based on RBDS (Radio Broadcast の Data System) in the United States or RDS (Radio Data System) in Europe. The RBDS decoder 16 decodes the digital multiplexed data from the audio signal demodulated by the detection circuit 7 and outputs the decoded data to the microcomputer 15.

In this embodiment, the program content identification data (PTY data) out of the data decoded by the RBDS decoder is used to calculate the frequency of the genre of the program received by the microcomputer 15 and the genre having the high reception frequency. Is changed so that the priority of the weighting table 15a is higher. That is, the RBDS decoder 16 functions as a genre acquisition unit that acquires the genre of a program received, and the microcomputer 15 functions as a reception frequency calculation unit and a priority change unit.

FIG. 9 shows a flowchart of the operation for changing the priority order in the weighting table 15a of the broadcasting station. The flowchart shown in FIG. 9 is executed by the microcomputer 15.

First, in step S201, genre information (PTY data) is acquired from the RBDS decoder 16, and the process proceeds to step S202. The PTY data includes news, sports, dramas, music, weather forecasts, etc. as genre information (Programme type), and these pieces of information are acquired.

Next, in step S202, the reception frequency of the genre received in step S201 is calculated, and the process proceeds to step S203. As the reception frequency, for example, the number of receptions and the reception time within a predetermined period for each genre may be calculated.

Next, in step S203, it is necessary to determine whether or not the priority order in the weighting table 15a of the broadcasting station broadcasting the genre whose reception frequency is calculated in step S202 needs to be changed. If yes (Yes), the process proceeds to step S204. If no change is necessary (No), the process ends. The criterion for determining whether or not to change the priority order may be arbitrarily determined based on, for example, the number of receptions or the reception time within the predetermined period described above.

Next, in step S204, the priority order of the weighting table 15a of the broadcasting station determined to be changed in step S203 is changed, and the process ends. In addition, you may change the priority of a broadcast station not only to the direction which makes it high, but to the direction which makes it low.

Then, during the seek operation, the operation is performed according to the flowchart shown in FIG. 4 as in the first embodiment. Of course, in this case, the priority order changed by the flowchart shown in FIG. 9 is applied.

According to the present embodiment, the RBDS decoder 16 that acquires the genre information of the program broadcast on the receiving broadcast station is provided, and the microcomputer 15 calculates the reception frequency of the genre based on the acquired genre information. Since the priority is changed on the basis of the calculated reception frequency, the weighting table 15a can be changed in consideration of the genre of the program. Therefore, the broadcast station that broadcasts the program of the genre that the user often listens to can be changed. It is possible to receive preferentially even in a state where there are many weak electric fields and noise.

In the embodiment described above, the RBDS decoder 16 is provided and the reception frequency is calculated from the genre of the program. However, even when the RBDS decoder 16 is not provided as shown in FIG. May be calculated to change the priority order of the broadcasting station.

Next, a receiving apparatus 1 according to a third embodiment of the present invention will be described with reference to FIG. 10 and FIG. The same parts as those in the first and second embodiments described above are denoted by the same reference numerals and description thereof is omitted.

In this embodiment, the configuration of the reception state control circuit 8 is different from those of the first and second embodiments. FIG. 10 shows the configuration of the receiving apparatus 1 according to the present embodiment.

In this embodiment, the reception state control circuit 8 includes an audio filter circuit 8e and a control circuit 8d.

The audio filter circuit 8e changes the bandwidth of the audio signal based on the instruction from the control circuit 8d with respect to the audio signal demodulated by the detection circuit 7, and outputs the audio signal to the audio amplifier 11. That is, the audio filter circuit 8e constitutes a bandwidth changing unit.

In this embodiment, the bandwidth of the audio filter circuit 8e is changed based on the genre information of the program acquired by the RBDS decoder 16. For example, when the genre information (PTY data) is news, as shown in FIG. 11, only the bandwidth of the human voice is passed, and other bands are attenuated and output without passing. That is, the genre information is discriminated by the microcomputer 15, and the bandwidth of the audio filter circuit 8e is changed by the control circuit 8d based on the genre information.

According to this embodiment, the reception state control circuit 8 includes the audio filter circuit 8e, and changes the bandwidth of the audio filter circuit 8e based on the program genre information acquired by the RBDS decoder 16, so that the program It is possible to control so that the voice of the matching bandwidth can be heard at a minimum.

Note that the present invention can be configured as a reception program by configuring the microcomputer 15 of the reception device 1 and the reception state control circuit 8 described above as programs that operate on a computer.

In the above-described embodiment, the receiving device 1 is a receiving device that receives a radio broadcast. However, the receiving device 1 can also be applied to a receiving device that receives a television broadcast.

According to the embodiment described above, the following receiving device 1, receiving method and receiving program can be obtained.

(Appendix 1) Antenna 2, RF amplifier circuit 3, front end 4, PLL unit 5, intermediate frequency amplifier circuit 6, detector circuit 7 for receiving radio waves, antenna 2, RF amplifier circuit 3, front end 4, PLL unit 5 The seek operation for searching for the broadcast wave from the broadcast station based on the S meter signal level and the noise amount of the radio wave received by the intermediate frequency amplifier circuit 6 and the detection circuit 7 and the threshold set in the S meter signal level and the noise amount. In the receiving device 1 including the microcomputer 15 that performs
A microcomputer 15 that stores a weighting table 15a that defines priority levels for receivable broadcasting stations and sets thresholds for the priority levels;
An antenna 2, an RF amplifier circuit 3, a front end 4, a PLL unit 5, an intermediate frequency amplifier circuit 6, and a reception state control circuit 8 for changing the sound quality of an audio signal included in the input signal received by the detection circuit 7,
The receiving apparatus 1 is characterized in that the microcomputer 15 performs a seek operation based on the weighting table 15 a and changes the sound quality so that the reception state control circuit 8 can listen to the program content in the audio signal.

(Appendix 2) A seek operation for receiving a radio wave and searching for a broadcast wave from a broadcast station based on the S meter signal level and noise amount of the received radio wave and a threshold set in the S meter signal level and noise amount. In the receiving method including steps S101 to S107 to be performed,
Steps S101 to S107 perform a seek operation based on a weighting table 15a in which priority levels are defined for receivable broadcast stations and threshold values are set for the priority levels, and audio signals included in the input signal A receiving method, wherein the sound quality is changed so that the contents of a program can be listened to.

(Supplementary Note 3) The computer of the receiving apparatus 1 including the antenna 2, the RF amplification circuit 3, the front end 4, the PLL unit 5, the intermediate frequency amplification circuit 6, and the detection circuit 7 that receive the radio wave, the antenna 2, the RF amplification circuit 3 From the broadcast station based on the S meter signal level and noise amount of the radio wave received by the front end 4, the PLL unit 5, the intermediate frequency amplifier circuit 6 and the detection circuit 7, and the threshold set in the S meter signal level and noise amount. In a receiving program that functions as a microcomputer 15 that performs a seek operation to search for a broadcast wave of
A microcomputer 15 that stores a weighting table 15a that defines priority levels for receivable broadcasting stations and sets thresholds for the priority levels;
A reception state control circuit 8 that changes the sound quality of an audio signal included in an input signal received by the antenna 2, the RF amplification circuit 3, the front end 4, the PLL unit 5, the intermediate frequency amplification circuit 6, and the detection circuit 7, and a computer As well as
A receiving program characterized in that the microcomputer 15 performs a seek operation based on the weighting table 15a and changes the sound quality so that the receiving state control circuit 8 can listen to the program content in the audio signal.

According to the receiving apparatus 1, the receiving method, and the receiving program, a broadcasting station that preferentially receives signals even if the receiving state is somewhat poor during a seek operation, and broadcasting that preferentially places importance on the receiving state (reception quality). By setting a threshold value for each station, two conditions can be satisfied simultaneously. In addition, in order for the reception state control circuit 8 to change the sound quality so that the program content in the audio signal can be listened to, the condition that the seek operation should be preferentially stopped even if the reception state is somewhat bad, and the reception state The broadcast contents can be discriminated under either of the conditions that the user wants to focus on.

It should be noted that the above-described embodiments are merely representative forms of the present invention, and the present invention is not limited to the embodiments. That is, various modifications can be made without departing from the scope of the present invention.

1 Receiver 2 Antenna (Receiving means)
3 RF amplifier circuit (receiving means)
4 Front end (reception means)
5 PLL section (reception means)
6 Intermediate Frequency Amplifier (Receiving means)
7 Detection circuit (reception means)
8 Reception status control circuit (sound quality control means)
8a Mute circuit (signal level attenuation means)
8b High cut circuit (High-frequency attenuation means)
8c Stereo separation circuit (stereo separation degree changing means)
8e Audio filter circuit (bandwidth changing means)
13 S meter detection circuit (field strength detection means)
14 Noise detection circuit (noise amount detection means)
15 Microcomputer (table storage means, reception control means, reception frequency calculation means, priority change means)
16 RBDS decoder (genre acquisition means)

Claims

Reception means for receiving radio waves, and reception control for performing a seek operation for searching for broadcast waves from a broadcast station based on an input signal converted from the radio waves received by the reception means and a threshold set in the input signals A receiving device comprising:
A table storage means for storing a weighting table that defines priority levels for receivable broadcast stations and sets the threshold value for each priority level;
Sound quality control means for changing the sound quality of an audio signal included in the input signal received by the receiving means,
The receiving control means, based on the weighting table, performs the seek operation and changes the sound quality so that the sound quality control means can listen to the program contents in the audio signal.
Electric field strength detecting means for detecting the electric field strength of the radio wave,
In the weighting table, the threshold value is set so that the electric field intensity detected by the electric field intensity detecting unit becomes weaker as the priority becomes higher.
The reception control means performs the seek operation based on the electric field intensity detected by the electric field intensity detection means and the weighting table, and changes the sound quality so that the program content in the audio signal can be heard by the sound quality control means. The receiving apparatus according to claim 1, wherein:
Comprising noise amount detecting means for detecting the noise amount of the radio wave,
In the weighting table, the threshold is set so that the amount of noise detected by the noise amount detection unit increases as the priority increases.
The reception control unit performs the seek operation based on the noise amount detected by the noise amount detection unit and the weighting table, and changes the sound quality so that the program content in the audio signal can be heard by the sound quality control unit. The receiving apparatus according to claim 1, wherein:
The reception control means, as the priority of the weighting table becomes higher, even when the electric field strength detected by the electric field strength detection means is weak, or even when the amount of noise detected by the noise amount detection means is large 4. The receiving apparatus according to claim 2, wherein the sound quality is changed so that the program content included in the audio signal can be heard.
A reception frequency calculating means for calculating the reception frequency of the receivable broadcasting station;
Priority order changing means for changing the priority of the weighting table of the broadcast station based on the reception frequency calculated by the reception frequency calculating means;
The receiving apparatus according to claim 1, further comprising:
A genre acquisition unit for acquiring a genre of a program received by the reception unit;
The reception frequency calculation means calculates the reception frequency of the genre acquired by the genre acquisition means,
The priority changing unit changes the priority of the broadcasting station that broadcasts a program related to the genre in the weighting table based on the reception frequency of the genre calculated by the reception frequency calculating unit. The receiving device according to claim 5.
The sound quality control means changes signal level attenuation means for attenuating the audio signal level, high-frequency attenuation means for attenuating a signal component of a predetermined frequency or higher included in the audio signal, and changes the stereo separation degree of the audio signal. 7. The receiving apparatus according to claim 1, further comprising at least one of stereo separation degree changing means.
The said sound quality control means is provided with the bandwidth change means which changes the frequency bandwidth contained in the said audio | voice signal based on the said genre which the said genre acquisition means acquired. Receiver device.
In a reception method including a reception control step of receiving a radio wave and performing a seek operation to search for a broadcast wave from a broadcast station based on the received input signal and a threshold set in the input signal,
In the reception control step, a priority order is defined for receivable broadcast stations, and the seek operation is performed based on a weighting table in which the threshold is set for each priority order, and an audio signal included in the input signal A receiving method, wherein the sound quality is changed so that the contents of a program can be listened to.
Receiving a computer of a receiving device having receiving means for receiving radio waves, performing a seek operation for searching for broadcast waves from a broadcasting station based on an input signal received by the receiving means and a threshold set in the input signal In a receiving program that functions as a control means,
A table storage means for storing a weighting table that defines priority levels for receivable broadcast stations and sets the threshold value for each priority level;
And causing the computer to function as sound quality control means for changing the sound quality of an audio signal included in the input signal received by the receiving means,
The reception control means, based on the weighting table, performs the seek operation and changes the sound quality so that the sound quality control means can listen to the program contents in the audio signal.
A computer-readable recording medium storing the receiving program according to claim 10.