JP2021019308A - Radio receiver and radio receiving program - Google Patents

Abstract

To suppress changes in sound quality when switching between digital broadcasting and analog broadcasting when crew members become accustomed to engine noise and road noise and become more likely to notice changes in sound quality.SOLUTION: A receiving unit 2 receives digital broadcasting and analog broadcasting. A reception situation detection unit 3 detects a reception situation at the receiving unit 2. A vehicle speed detection unit 4 detects vehicle speed. An audio control unit 5 switches between digital broadcasting and analog broadcasting according to the reception situation detected by the reception situation detection unit 3, and adjusts voice quality adjustment when switching between digital broadcasting and analog broadcasting by using a parameter corresponding to the vehicle speed detected by the vehicle speed detection unit 4 and duration of the vehicle speed. A voice output unit 6 outputs voice of the digital broadcasting or analog broadcasting switched by the audio control unit 5.SELECTED DRAWING: Figure 1

Description

The present invention relates to a radio receiver and a radio receiver program.

Patent Document 1 describes a sound quality adjusting method for a radio receiver mounted on a vehicle. When the vehicle speed is high, engine noise and road noise become large, and the occupants do not care about the noise of the radio broadcast output from the speaker. Therefore, the radio receiver described in Patent Document 1 makes adjustments with an emphasis on suppressing changes in sound quality when switching between digital broadcasting and analog broadcasting when the vehicle speed is high, and emphasizes noise suppression of radio broadcasting when the vehicle speed is slow. Make the adjustments you made.

JP-A-2018-195890

If the vehicle continues to travel at a substantially constant speed, the occupants will not be concerned about engine noise and road noise regardless of the speed of the vehicle, so that it becomes easier for the occupants to notice the change in sound quality when switching between digital broadcasting and analog broadcasting. However, the conventional radio receiver as described in Patent Document 1 does not consider the occupant's accustomed to engine noise and the like when the vehicle continues to travel at a substantially constant speed. Therefore, in the conventional radio receiver, when the occupant becomes accustomed to engine noise and road noise, he / she notices a change in sound quality when switching between digital broadcasting and analog broadcasting, and feels uncomfortable.

The present invention has been made to solve the above problems, and when the occupant becomes accustomed to engine noise and road noise and becomes more likely to notice the change in sound quality, the change in sound quality when switching between digital broadcasting and analog broadcasting can be detected. The purpose is to suppress it.

The radio receiving device according to the present invention is a radio receiving device mounted on a vehicle, and is a receiving unit that receives digital broadcasting and analog broadcasting, a receiving status detecting unit that detects the reception status in the receiving unit, and a vehicle speed detection unit. Switching between digital broadcasting and analog broadcasting according to the reception status detected by the vehicle speed detection unit and the reception status detection unit, and using the parameters according to the vehicle speed and the duration of the vehicle speed detected by the vehicle speed detection unit. It includes an audio control unit that adjusts the sound quality when switching between digital broadcasting and analog broadcasting, and an audio output unit that outputs the sound of the digital broadcasting or analog broadcasting switched by the audio control unit.

According to the present invention, since the sound quality is adjusted when switching between digital broadcasting and analog broadcasting using parameters according to the vehicle speed and the duration of the vehicle speed, the occupants become accustomed to engine noise and road noise and the sound quality changes. When it becomes easy to notice, it is possible to suppress the change in sound quality when switching between digital broadcasting and analog broadcasting.

It is a block diagram which shows the structural example of the radio receiving apparatus which concerns on Embodiment 1. FIG. FIG. 2A is a diagram showing an example of parameters used when switching from analog broadcasting of FM radio to digital broadcasting, and FIG. 2B is a diagram showing an example of parameters used when switching from digital broadcasting of FM radio to analog broadcasting. FIG. 3A is a diagram showing an example of parameters used when switching from analog broadcasting of AM radio to digital broadcasting, and FIG. 3B is a diagram showing an example of parameters used when switching from digital broadcasting of AM radio to analog broadcasting. FIG. 4A is a graph showing an example of blending processing when switching from analog broadcasting to digital broadcasting, FIG. 4B is a graph showing an example of separation parameters, and FIG. 4C is a graph showing an example of high-cut parameters. FIG. 5A is a graph showing an example of blending processing when switching from digital broadcasting to analog broadcasting, FIG. 5B is a graph showing an example of separation parameters, and FIG. 5C is a graph showing an example of high-cut parameters. It is a graph which shows the parameter control example according to the duration of a vehicle speed. It is a flowchart which shows the parameter control example by the radio receiving apparatus which concerns on Embodiment 1. FIG. It is a figure which shows the hardware configuration example of the radio receiver which concerns on Embodiment 1. FIG.

Embodiment 1.
FIG. 1 is a block diagram showing a configuration example of the radio receiving device 1 according to the first embodiment. The radio reception device 1 includes a reception unit 2, a reception status detection unit 3, a vehicle speed detection unit 4, an audio control unit 5, and a voice output unit 6. The radio receiver 1 is mounted on a vehicle and is connected to a speaker 7 installed in the vehicle.

The receiving unit 2 simultaneously receives a digital broadcast wave and an analog broadcast wave including the same broadcast content broadcast according to the IBOC (In Band On Channel) standard. That is, the receiving unit 2 receives the AM radio digital broadcast wave and analog broadcast wave desired by the occupant, or the FM radio digital broadcast wave and analog broadcast wave desired by the occupant. The receiving unit 2 converts the received digital broadcast wave into a digital broadcast signal and outputs it to the audio control unit 5. Similarly, the receiving unit 2 converts the received analog broadcast wave into an analog broadcast signal and outputs it to the audio control unit 5.

The reception status detection unit 3 detects the reception status of the digital broadcast wave and the reception status of the analog broadcast wave in the reception unit 2. The reception status detection unit 3 outputs the detected reception status to the audio control unit 5. The reception situation includes at least one of electric field strength, carrier-to-noise ratio (C / N), multipath noise, high frequency noise, or interference level.

The vehicle speed detection unit 4 detects the speed (hereinafter, referred to as “vehicle speed”) of the vehicle on which the radio receiving device 1 is mounted. The vehicle speed detection unit 4 acquires vehicle speed information from various information flowing through the vehicle network, for example. The vehicle speed detection unit 4 outputs the detected vehicle speed to the audio control unit 5.

The audio control unit 5 switches between a digital broadcast signal and an analog broadcast signal to be output to the audio output unit 6 according to the reception status detected by the reception status detection unit 3. Since a well-known technique may be used for the method of switching between the digital broadcast signal and the analog broadcast signal according to the reception situation, the description thereof will be omitted.

The audio output unit 6 outputs a digital broadcast signal or an analog broadcast signal output from the audio control unit 5 from the speaker 7 as audio.

The audio control unit 5 of the first embodiment adjusts the sound quality when switching between the digital broadcast signal and the analog broadcast signal according to the reception status according to the vehicle speed detected by the vehicle speed detection unit 4 and the duration of the vehicle speed. This is done using parameters. It is assumed that the parameters are stored in advance by the audio control unit 5.

In the case of the IBOC standard, the broadcast content is the same for digital broadcasting and analog broadcasting. However, in analog broadcasting, compared to digital broadcasting, if the reception condition is poor, noise (hereinafter referred to as "acoustic noise") is likely to be mixed in the sound, so that there is a difference between the sound quality of analog broadcasting and the sound quality of digital broadcasting. Therefore, when the analog broadcasting and the digital broadcasting are switched, the sound quality changes, and the occupant may feel uncomfortable.

However, the faster the vehicle speed, the greater the engine noise and road noise. Therefore, the occupant is less likely to notice the change in sound quality when switching between digital broadcasting and analog broadcasting. On the contrary, the slower the vehicle speed, the smaller the engine noise and the road noise. Therefore, the occupants are likely to notice that the sound quality changes when the digital broadcast and the analog broadcast are switched. Therefore, when the increase / decrease value of the vehicle speed is equal to or more than a predetermined value (for example, ± 5 km / h per unit time), the audio control unit 5 selects a parameter according to the vehicle speed. More specifically, the audio control unit 5 selects a parameter that suppresses a change in sound quality when switching between digital broadcasting and analog broadcasting when the vehicle speed is slow when the increase / decrease value of the vehicle speed is equal to or higher than the predetermined value. However, when the vehicle speed is high, select a parameter that suppresses the acoustic noise of digital broadcasting and analog broadcasting.

If the vehicle speed is almost constant and does not change, the occupants become accustomed to engine noise and road noise, and are more likely to notice changes in sound quality when switching between digital broadcasting and analog broadcasting. Therefore, when the increase / decrease value of the vehicle speed is less than the above-mentioned predetermined value, the audio control unit 5 selects a parameter according to the vehicle speed and the duration of the vehicle speed. More specifically, when the increase / decrease value of the vehicle speed is less than the predetermined value, the audio control unit 5 changes the sound quality when switching between digital broadcasting and analog broadcasting as the duration of the vehicle speed becomes longer. Select more suppressive parameters.

FIG. 2A is a diagram showing an example of parameters used when switching from analog broadcasting to digital broadcasting of FM radio. FIG. 2B is a diagram showing an example of parameters used when switching from digital broadcasting to analog broadcasting of FM radio. FIG. 3A is a diagram showing an example of parameters used when switching from analog broadcasting to digital broadcasting of AM radio. FIG. 3B is a diagram showing an example of parameters used when switching from digital broadcasting to analog broadcasting of AM radio. FIG. 4A is a graph showing an example of blending processing when switching from analog broadcasting to digital broadcasting. FIG. 4B is a graph showing an example of separation parameters used when switching from analog broadcasting to digital broadcasting. FIG. 4C is a graph showing an example of high-cut parameters used when switching from analog broadcasting to digital broadcasting. FIG. 5A is a graph showing an example of brand processing when switching from digital broadcasting to analog broadcasting. FIG. 5B is a graph showing an example of separation parameters used when switching from digital broadcasting to analog broadcasting. FIG. 5C is a graph showing an example of high-cut parameters used when switching from digital broadcasting to analog broadcasting.
The parameters A0, B0, C0, and D0 in FIGS. 4A, 4B, 4C, 5A, 5B, and 5C are FM radio parameter examples.

The audio control unit 5 switches from analog broadcasting to digital broadcasting when the reception condition of the analog broadcasting wave deteriorates when the analog broadcasting signal is output to the audio output unit 6. At that time, as shown in FIG. 4A, the audio control unit 5 gradually reduces the ratio of the analog broadcast signal output to the audio output unit 6, and gradually reduces the ratio of the digital broadcast signal output to the audio output unit 6. Perform the blending process to increase. On the other hand, the audio control unit 5 switches from digital broadcasting to analog broadcasting when the reception condition of the digital broadcasting wave deteriorates when the digital broadcasting signal is output to the audio output unit 6. At that time, as shown in FIG. 5A, the audio control unit 5 gradually reduces the ratio of the digital broadcast signal output to the audio output unit 6, and gradually reduces the ratio of the analog broadcast signal output to the audio output unit 6. Perform the blending process to increase. At the time of these blending processes, the audio control unit 5 adjusts the sound quality using the vehicle speed or the parameters according to the vehicle speed and its duration.

When the increase / decrease value of the vehicle speed is equal to or higher than the predetermined value, the audio control unit 5 selects one of the parameters A0, B0, C0, and D0 according to the vehicle speed. Here, the audio control unit 5 divides the vehicle speed into four stages of maximum speed level, high speed level, low speed level, and minimum speed level, and parameter A0 at the maximum speed level, parameter B0 at the high speed level, and low speed. Select parameter C0 at the level and parameter D0 at the lowest speed level. That is, the audio control unit 5 selects a parameter that emphasizes suppression of acoustic noise when the vehicle speed is high, and selects a parameter that emphasizes suppression of sound quality change when the vehicle speed is slow. Here, four parameters are prepared according to the vehicle speed, but the number of parameters is arbitrary.

When the increase / decrease value of the vehicle speed is less than the above-mentioned predetermined value, the audio control unit 5 selects one of the parameters A0, B0, C0, D0 according to the vehicle speed, and the selected parameters A0, B0, C0, Any of D0 is changed to any of the parameters A1, A2, A3, B1, B2, B3, C1, C2, C3, D1, D2, D3 according to the duration of the vehicle speed. For example, when the vehicle speed at the highest speed level continues, the audio control unit 5 changes the parameter A0 to the parameter A1, the parameter A2, and the parameter A3 as the duration becomes longer. Parameter A1 is more important than parameter A0, parameter A2 is more important than parameter A1, and parameter A3 is more important than parameter A2 to suppress changes in sound quality. In FIGS. 2A, 2B, 3A, and 3B, parameter A1 is the same as parameter B0, parameter A2 is the same as parameter C0, and parameter A3 is the same as parameter D0.

Although not shown in FIGS. 2A, 2B, 3A, and 3B, parameters B1, C1, D1, and parameters B1, from parameters B0, C0, and D0 are similar to parameters A0, A1, A2, and A3. Parameters B2, C2, D2 are more important than C1, D1, and parameters B3, C3, D3 are more important than parameters B2, C2, D2 to suppress changes in sound quality. Here, three parameters are prepared according to the duration for each speed, but the number of parameters is arbitrary.

Sound quality adjustment with an emphasis on suppressing changes in sound quality means blending analog broadcast audio closer to digital broadcast audio by performing separation and high-cut processing according to parameters, or converting digital broadcast audio to analog broadcast audio. It is to blend them closer together. For example, when the audio of digital broadcasting is brought closer to the audio of analog broadcasting, the audio control unit 5 adjusts the separation toward monaural (that is, narrows the separation) and cuts the frequency component by high-cut processing to reduce the sound quality. Blending is performed using such parameters. As a result, the audio control unit 5 can prevent the occupant from feeling the change in sound quality.

Next, the details of the parameters will be described.
First, an example of parameters when switching from analog broadcasting to digital broadcasting will be described.
The slower the vehicle speed, the smaller the engine noise, etc., and the easier it is for the occupants to notice the change in sound quality. Therefore, as shown in FIGS. 2A and 4B, when switching from analog broadcasting of FM radio to digital broadcasting, parameters A0, B0, C0, so that the slower the vehicle speed, the faster the separation of analog broadcasting of FM radio is expanded. D0 is set. On the other hand, in the FM radio digital broadcasting, the parameters A0, B0, C0, and D0 are set so that the separation is gradually widened as the vehicle speed is slower. As shown in FIG. 3A, in the case of AM radio, the separation is adjusted only for digital broadcasting, and the separation adjustment for analog broadcasting is not performed. As shown in FIG. 4B as “AM parameter A0”, the separation adjustment is started in the AM radio digital broadcast from a narrower state than the FM radio digital broadcast. The parameters B0, C0, and D0 of the AM radio digital broadcast are set with the AM parameter A0 shown in FIG. 4B as the reference, as the parameters B0, C0, and D0 are set with the parameter A0 as the reference in the FM radio digital broadcast. Set.

In addition, the longer the duration of the same vehicle speed, the easier it is for the occupant to become accustomed to engine noise and the like and notice changes in sound quality. Therefore, when switching from analog broadcasting to digital broadcasting, the parameters A1, A2, A3, parameters B1, B2, B3, parameters C1, C2, C3, and parameters D1, D2, D3 of analog broadcasting are the parameters A0, B0, Based on C0 and D0, the longer the duration of the same vehicle speed, the faster the separation is set. On the other hand, the parameters A1, A2, A3, parameters B1, B2, B3, parameters C1, C2, C3, and parameters D1, D2, D3 of digital broadcasting have the same vehicle speed based on the parameters A0, B0, C0, D0. The longer the duration of, the slower the separation is set.

The slower the vehicle speed, the smaller the engine noise, etc., and the easier it is for the occupants to notice the change in sound quality. Therefore, as shown in FIGS. 2A and 4C, when switching from analog broadcasting of FM radio to digital broadcasting, parameters A0, B0, C0 are used so that the slower the vehicle speed, the faster the high-cut processing of analog broadcasting of FM radio is weakened. , D0 is set. On the other hand, in FM radio digital broadcasting, parameters A0, B0, C0, and D0 are set so that the slower the vehicle speed, the slower the high-cut processing is weakened. As shown in FIG. 3A, the parameters A0, B0, C0, D0 of the AM radio digital broadcasting are the same as the parameters A0, B0, C0, D0 of the FM radio digital broadcasting. As shown in FIG. 4C as "AM parameter A0", the analog broadcast of AM radio is adjusted to weaken the high cut process faster than the analog broadcast of FM radio. The parameters B0, C0, and D0 of the analog broadcast of AM radio are set with reference to the parameter A0 of AM shown in FIG. 4C, as the parameters B0, C0, and D0 are set with reference to the parameter A0 in the digital broadcast of FM radio. Set.

In addition, the longer the duration of the same vehicle speed, the easier it is for the occupant to become accustomed to engine noise and the like and notice changes in sound quality. Therefore, when switching from analog broadcasting to digital broadcasting, the parameters A1, A2, A3, parameters B1, B2, B3, parameters C1, C2, C3, and parameters D1, D2, D3 of analog broadcasting are the parameters A0, B0, Based on C0 and D0, the longer the duration of the same vehicle speed, the faster the high cut process is set to weaken. On the other hand, the parameters A1, A2, A3, parameters B1, B2, B3, parameters C1, C2, C3, and parameters D1, D2, D3 of digital broadcasting have the same vehicle speed based on the parameters A0, B0, C0, D0. The longer the duration of, the slower the high cut process is set to weaken.

Next, an example of parameters when switching from digital broadcasting to analog broadcasting will be described.
The slower the vehicle speed, the smaller the engine noise, etc., and the easier it is for the occupants to notice the change in sound quality. Therefore, as shown in FIGS. 2B and 5B, when switching from digital broadcasting of FM radio to analog broadcasting, parameters A0, B0, C0, so as to slowly narrow the separation of analog broadcasting of FM radio as the vehicle speed is slower. D0 is set. On the other hand, in FM radio digital broadcasting, parameters A0, B0, C0, and D0 are set so that the slower the vehicle speed, the faster the separation is narrowed. As shown in FIG. 3B, in the case of AM radio, the separation is adjusted only for digital broadcasting, and the separation adjustment for analog broadcasting is not performed. As shown in FIG. 5B as "AM parameter A0", the AM radio digital broadcast is adjusted for faster and narrower separation than the FM radio digital broadcast. The parameters B0, C0, and D0 of the AM radio digital broadcast are set with the AM parameter A0 shown in FIG. 5B as the reference, as the parameters B0, C0, and D0 are set with the parameter A0 as the reference in the FM radio digital broadcast. Set.

In addition, the longer the duration of the same vehicle speed, the easier it is for the occupant to become accustomed to engine noise and the like and notice changes in sound quality. Therefore, when switching from digital broadcasting to analog broadcasting, the parameters A1, A2, A3, parameters B1, B2, B3, parameters C1, C2, C3, and parameters D1, D2, D3 of analog broadcasting are the parameters A0, B0, Based on C0 and D0, the longer the duration of the same vehicle speed, the slower the separation is set. On the other hand, the parameters A1, A2, A3, parameters B1, B2, B3, parameters C1, C2, C3, and parameters D1, D2, D3 of digital broadcasting have the same vehicle speed based on the parameters A0, B0, C0, D0. The longer the duration of, the faster the separation is set to narrow.

The slower the vehicle speed, the smaller the engine noise, etc., and the easier it is for the occupants to notice the change in sound quality. Therefore, as shown in FIGS. 2B and 5C, when switching from digital broadcasting of FM radio to analog broadcasting, parameters A0, B0, C0 are used so that the slower the vehicle speed, the slower the high-cut processing of analog broadcasting of FM radio is strengthened. , D0 is set. On the other hand, in FM radio digital broadcasting, parameters A0, B0, C0, and D0 are set so that the slower the vehicle speed, the faster the high-cut processing is strengthened. As shown in FIG. 3B, the parameters A0, B0, C0, D0 of the digital broadcasting of the AM radio are the same as the parameters A0, B0, C0, D0 of the digital broadcasting of the FM radio. As shown in FIG. 5C as "AM parameter A0", the analog broadcast of AM radio starts the high-cut process later than the analog broadcast of FM radio. The parameters B0, C0, and D0 of the analog broadcasting of the AM radio are set with the parameters B0, C0, and D0 of the AM radio shown in FIG. Set.

In addition, the longer the duration of the same vehicle speed, the easier it is for the occupant to become accustomed to engine noise and the like and notice changes in sound quality. Therefore, when switching from digital broadcasting to analog broadcasting, the parameters A1, A2, A3, parameters B1, B2, B3, parameters C1, C2, C3, and parameters D1, D2, D3 of analog broadcasting are the parameters A0, B0, Based on C0 and D0, the higher the duration of the same vehicle speed, the slower the high-cut processing is set. On the other hand, the parameters A1, A2, A3, parameters B1, B2, B3, parameters C1, C2, C3, and parameters D1, D2, D3 of digital broadcasting have the same vehicle speed based on the parameters A0, B0, C0, D0. The longer the duration of, the faster the high cut process is set to be strengthened.

FIG. 6 is a graph showing an example of parameter control according to the duration of the vehicle speed. When the increase / decrease value of the vehicle speed is equal to or more than the predetermined value as in the period T1 of FIG. 6, the audio control unit 5 selects the parameters D0, C0, B0 according to the vehicle speed. When it becomes necessary to switch between analog broadcasting and digital broadcasting according to the reception status, the audio control unit 5 adjusts the sound quality at the time of switching by using the parameter selected at that time. As a result, as the vehicle speed increases, the sound quality adjustment that emphasizes the suppression of sound quality change changes to the sound quality adjustment that emphasizes the suppression of acoustic noise.

As in the period T2 of FIG. 6, the audio control unit 5 selects the parameter A0 according to the vehicle speed. After that, when the increase / decrease value of the vehicle speed is less than the above-mentioned predetermined value and the vehicle speed continues for the predetermined X seconds or more, the audio control unit 5 places more importance on suppressing the change in sound quality from the parameter A0. Change to parameter A1.

As in the period T3 of FIG. 6, when the time in which the increase / decrease value of the vehicle speed is equal to or more than the predetermined value is continued for N seconds or more, the parameter A0, which corresponds only to the vehicle speed, Select B0.

As in the period T4 of FIG. 6, when the increase / decrease value of the vehicle speed is less than the predetermined value and the vehicle speed continues for X seconds or more, the sound quality changes more from the parameter B0. Change to parameter B1 that emphasizes suppression. After that, when the increase / decrease value of the vehicle speed is less than the above-mentioned predetermined value and the vehicle speed continues for Y seconds (Y> X) or more, the audio control unit 5 places more importance on suppressing the change in sound quality. Change to the parameter B2. After that, when the increase / decrease value of the vehicle speed is less than the above-mentioned predetermined value and the vehicle speed continues for the predetermined Z seconds (Z> Y) or more, the audio control unit 5 places more importance on suppressing the change in sound quality. Change to the parameter B3.

FIG. 7 is a flowchart showing an example of parameter control by the radio receiving device 1 according to the first embodiment.
For example, the radio receiving device 1 starts the operation shown in the flowchart of FIG. 7 when the ignition switch of the vehicle equipped with the radio receiving device 1 is turned on, and is shown in the flowchart of FIG. 7 when the ignition switch is turned off. End the operation.
In parallel with the operation shown in the flowchart of FIG. 7, the reception status detection unit 3 detects the reception status in the reception unit 2, and the audio control unit 5 determines to switch between digital broadcasting and analog broadcasting according to the reception status. ing. When the audio control unit 5 determines that switching between digital broadcasting and analog broadcasting is to be performed, the audio control unit 5 performs a blending process using the parameters selected in the flowchart of FIG.

In step ST1, the vehicle speed detection unit 4 starts detecting the vehicle speed.
In step ST2, the audio control unit 5 selects one of the parameters A0, B0, C0, and D0 according to the vehicle speed detected by the vehicle speed detection unit 4.

In step ST3, the audio control unit 5 detects the duration of the vehicle speed from the time when the parameter is selected in step ST2, or the duration of the vehicle speed from the time when the parameter is changed in step ST5.
In step ST4, when the duration of the vehicle speed is equal to or longer than a predetermined time (for example, X seconds, Y seconds, or Z seconds in FIG. 6) (step ST4 “YES”), step ST5 In, the parameter selected in step ST2 or the parameter changed in step ST5 is changed according to the duration of the vehicle speed. On the other hand, when the duration of the vehicle speed is less than a predetermined time (step ST4 “NO”), the audio control unit 5 performs the operation of step ST3.

In step ST6, the audio control unit 5 performs the operation of step ST2 when the increase / decrease value of the vehicle speed is equal to or more than the predetermined value (step ST6 “YES”). On the other hand, when the increase / decrease value of the vehicle speed is less than the predetermined value (step ST6 “NO”), the audio control unit 5 performs the operation of step ST3.

Finally, the hardware configuration of the radio receiver 1 according to the first embodiment will be described.
FIG. 8 is a diagram showing a hardware configuration example of the radio receiver 1 according to the first embodiment. The functions of the receiving unit 2, the receiving status detecting unit 3, the vehicle speed detecting unit 4, the audio control unit 5, and the voice output unit 6 in the radio receiving device 1 are realized by a processing circuit. That is, the radio receiving device 1 includes a processing circuit for realizing the above functions. The processing circuit is realized by a processor 101 that executes a program stored in the memory 102.

The functions of the receiving unit 2, the receiving status detecting unit 3, the vehicle speed detecting unit 4, the audio control unit 5, and the audio output unit 6 are realized by software, firmware, or a combination of software and firmware. The software or firmware is described as a program and stored in the memory 102. The processor 101 realizes the functions of each part by reading and executing the program stored in the memory 102. That is, the radio receiver 1 includes a memory 102 for storing a program in which the step shown in the flowchart of FIG. 7 is eventually executed when executed by the processor 101. Further, it can be said that this program causes the computer to execute the procedure or method of the receiving unit 2, the receiving status detecting unit 3, the vehicle speed detecting unit 4, the audio control unit 5, and the voice output unit 6.

Here, the processor 101 is a CPU (Central Processing Unit), a processing device, an arithmetic unit, a microprocessor, or the like.
The memory 102 may be a non-volatile or volatile semiconductor memory such as a RAM (Random Access Memory), a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), or a flash memory, and may be a non-volatile or volatile semiconductor memory such as a hard disk or a flexible disk. It may be a magnetic disk of the above, or an optical disk such as a CD (Compact Disc) or a DVD (Digital Versaille Disc).

As described above, the radio receiving device 1 according to the first embodiment includes a receiving unit 2, a receiving status detecting unit 3, a vehicle speed detecting unit 4, an audio control unit 5, and a voice output unit 6. The receiving unit 2 receives digital broadcasting and analog broadcasting. The reception status detection unit 3 detects the reception status in the reception unit 2. The vehicle speed detection unit 4 detects the vehicle speed. The audio control unit 5 switches between digital broadcasting and analog broadcasting according to the reception status detected by the reception status detection unit 3, and sets parameters according to the vehicle speed detected by the vehicle speed detection unit 4 and the duration of the vehicle speed. Use to adjust the sound quality when switching between digital broadcasting and analog broadcasting. The audio output unit 6 outputs the audio of the digital broadcast or analog broadcast switched by the audio control unit 5. With this configuration, the radio receiver 1 changes the sound quality when the digital broadcast and the analog broadcast are switched when the vehicle continues to run at a substantially constant speed and the occupants become accustomed to the engine noise and the road noise and easily notice the change in the sound quality. Can be suppressed. Therefore, the radio receiving device 1 can prevent the occupant from feeling a sense of discomfort due to a change in sound quality.

Further, when the increase / decrease value of the vehicle speed detected by the vehicle speed detection unit 4 is equal to or more than the predetermined value, the audio control unit 5 of the first embodiment adjusts the sound quality by using the parameters according to the vehicle speed. When the increase / decrease value of the vehicle speed is less than the predetermined value, the sound quality is adjusted by using the parameters corresponding to the vehicle speed and the duration of the vehicle speed. As a result, the radio receiving device 1 can prevent the occupant from feeling a sense of discomfort due to the change in sound quality even when the occupant is likely to notice the change in sound quality because the vehicle speed is slow and the engine noise is small.

Further, the audio control unit 5 of the first embodiment switches between digital broadcasting and analog broadcasting when the vehicle speed increase / decrease value detected by the vehicle speed detection unit 4 is equal to or more than the predetermined value and the vehicle speed is slow. Use the parameter that suppresses the change in sound quality, and use the parameter that suppresses the noise of digital broadcasting and analog broadcasting when the vehicle speed is high. As a result, the radio receiving device 1 can not only make the occupant feel uncomfortable due to the change in sound quality, but also prevent the occupant from feeling the acoustic noise.

Further, when the increase / decrease value of the vehicle speed detected by the vehicle speed detection unit 4 is less than the above-mentioned predetermined value, the audio control unit 5 of the first embodiment performs digital broadcasting as the duration of the vehicle speed becomes longer. Change to a parameter that further suppresses changes in sound quality when switching analog broadcasting. The longer the vehicle travels at a substantially constant speed, the easier it is for the occupants to notice the change in sound quality when switching between digital broadcasting and analog broadcasting. However, in the radio receiver 1, the vehicle is almost constant due to the above parameter control. Even if the vehicle travels at a high speed for a long time, it is possible to prevent the occupant from feeling a sense of discomfort due to a change in sound quality.

It should be noted that, within the scope of the present invention, it is possible to modify any component of the embodiment or omit any component of the embodiment.

1 Radio receiver, 2 receiver, 3 reception status detector, 4 vehicle speed detector, 5 audio control unit, 6 voice output unit, 7 speakers, 101 processor, 102 memory.

Claims (5)

A radio receiver mounted on a vehicle
A receiver that receives digital and analog broadcasts,
A reception status detection unit that detects the reception status in the reception unit,
Vehicle speed detector that detects vehicle speed and
Digital broadcasting and analog broadcasting are switched according to the reception status detected by the reception status detection unit, and digital broadcasting and analog broadcasting are used using parameters according to the vehicle speed detected by the vehicle speed detection unit and the duration of the vehicle speed. An audio control unit that adjusts the sound quality when switching broadcasts,
A radio receiving device including an audio output unit that outputs audio of digital broadcasting or analog broadcasting switched by the audio control unit. When the increase / decrease value of the vehicle speed detected by the vehicle speed detection unit is equal to or higher than a predetermined value, the audio control unit adjusts the sound quality using a parameter according to the vehicle speed, and the increase / decrease value of the vehicle speed is predetermined. The radio receiving device according to claim 1, wherein when the value is less than the specified value, the sound quality is adjusted by using the parameters corresponding to the vehicle speed and the duration of the vehicle speed. When the increase / decrease value of the vehicle speed detected by the vehicle speed detection unit is equal to or more than the predetermined value, the audio control unit suppresses a change in sound quality when switching between digital broadcasting and analog broadcasting when the vehicle speed is slow. The radio receiver according to claim 2, wherein a parameter is used, and when the vehicle speed is high, a parameter that suppresses noise of digital broadcasting and analog broadcasting is used. When the increase / decrease value of the vehicle speed detected by the vehicle speed detection unit is less than the predetermined value, the audio control unit has a sound quality when switching between digital broadcasting and analog broadcasting as the duration of the vehicle speed becomes longer. The radio receiver according to claim 2, wherein the parameters are changed to suppress changes more. A radio reception program for a radio receiver installed in a vehicle.
Receiving procedures for receiving digital and analog broadcasts,
The reception status detection procedure for detecting the reception status in the reception procedure and the reception status detection procedure
Vehicle speed detection procedure to detect vehicle speed and
The digital broadcast and analog broadcast received by the reception procedure are switched according to the reception status detected by the reception status detection procedure, and the parameters corresponding to the vehicle speed detected by the vehicle speed detection procedure and the duration of the vehicle speed are set. Audio control procedure to adjust the sound quality when switching between digital broadcasting and analog broadcasting using
A radio reception program that causes a computer to execute an audio output procedure for outputting audio of digital broadcasting or analog broadcasting adjusted by the audio control procedure.

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