JPS5862922A - Radio receiver for car - Google Patents

Abstract

PURPOSE:To avoid erroneous display, even if broadcasting stations of the same frequency exist at each district, by storing the data of the name of broadcasting station in each of a plurality of memories at a prescribed district and selecting the memories in accordance with the driving district. CONSTITUTION:Assuming that a car is driving in the Kanto-area, a memory selection switch 22 selects and connects a memory and a controller which stores the name of broadcasting staton of the Kanto-area, e.g., a memory 20a and a controller 12. In operating an automatic channel selection button 15 in this state, the sweep of the controller 12 is stopped and locked, when the sweep of a local oscillating frequency f0 of a local osilllator 6 reaches the local frequency to receive a desired broadcast. Inthis case, based on the frequency dividing ratio N generated from the controller 12, a data readout instruction is given to the memory 20a, the data of the name of coresponding station is read out and the character display is done for a display 14. Through the switching of memories 20a-20n in response to the driving of a car, the data of the name of broadcasting station of the district is read out in accordance with the frequency dividing ratio N and displayed on a display device 14.

Description

Detailed Description of the Invention: #4#'i of the present invention, in a device that displays the name of the received broadcasting station in text when receiving a broadcast, even if there are a number of broadcasting stations using the same frequency in each region. This relates to a radio receiver for a vehicle that does not display broadcast station name meeting #I4.

The present inventors have developed a radio receiver for vehicles that displays the name of the receiving broadcasting station in text, based on the broadcast network frequency of 149kNK, which determines the local oscillation frequency of an electronic tuner that uses a PLL synthesizer method. We proposed a device that would read out the broadcasting station name data stored in memory in advance in accordance with a predetermined gradation value, and display the broadcasting station name in letters (letters) on the dot matrix display. With this device, it is possible to easily know the name of the broadcasting station of the broadcast being received, and the desired broadcast can be reliably received.

By the way, if we take Japan as an example, a broadcasting station with a nationwide network like NHK-FM uses the same broadcasting frequency as the representative frequency for multiple local stations set up in each predetermined area. Since each local station has a small transmission output and a service area fixed to a specific area, the local station broadcasts its own programs depending on the time of day.

On the other hand, in the above device, since the broadcasting station name is stored and displayed in the memo 9 for each broadcasting frequency, for example, if the data of the representative station name is stored in the memory,
There is also a problem in that when traveling within the service area of a local station using the same frequency a as the representative amount, the station name of the representative station is displayed and an incorrect broadcasting station name is displayed.

The present invention has been made in view of the above LC, and includes a device that reads data ζ of broadcasting station names stored in advance based on the reception frequency and displays the characters in characters.Broadcasting stations using the same frequency In order to avoid incorrectly displaying the name of a broadcasting station even if there are multiple broadcasting stations in the area, the data of the broadcasting station name is stored in each of a plurality of memories for each predetermined region, and the memory is selected according to the driving area. This is how it was done.

Hereinafter, the present invention will be explained based on Figure thIK. - Figure is a block diagram showing one embodiment of the present invention.

First, to explain the configuration, l is a receiving antenna, 2 is a high frequency amplifier equipped with a frequency tuning circuit, 3 is a mixing circuit that converts the received frequency into an intermediate frequency signal, 4 is an intermediate frequency amplification circuit, and 5 5 is a detection circuit, and an acoustic amplifier III & circuit and a speaker (not shown) are installed at the subsequent stage of the detection circuit 5.

61t1 This is a local oscillator using a voltage controlled oscillator (VUC) that outputs a local oscillation signal for converting the broadcast frequency into an intermediate frequency signal, and the oscillation frequency mantissa is controlled by PLLI 1, which has one type of frequency synthesizer. Ru. In this PLLII, 8 is a frequency oscillator that oscillates a reference network wave number I of f9r'tt frequency t & number 6, and 9 is a frequency input from the local oscillator 6 via a brisk rough (only D M is frequency divided to 1). 0 A programmable frequency divider that divides the signal by (1/N)K based on the set division value N, and compares the output network wave numbers of the ioFimt wave number generator 8 and the programmable frequency divider 9, and calculates the phase difference between them. In this way, the intermediate oscillator 6, the rescaler 7 and the PLLI
The function of tuning by an electronic tuner using one type of frequency synthesizer consisting of I is as follows.If the oscillation of the local oscillator 6 is i'frequency tf, then the output chest wave number rn#i of the programmable divider jR unit 9 is Then, in the phase comparator 10, the fundamental single frequency 11i number from the frequency oscillator 8, fr
The difference between n and n is detected, and a DC voltage proportional to this difference is fed back to the local oscillator 6.

The loop operation is repeated until the frequencies fm and fr become the same, and when they match, the oscillation frequency of the local oscillator 60 is locked. Therefore, the local oscillation frequency is accurately determined by the frequency division value N set in the programmable divider 9 and the reference oscillation frequency fr. In the case of electronic identification using this one type of frequency synthesizer, the reference oscillation frequency frt-channel w11 wave number, that is, in the case of AM, 9kb%F
In the case of MO, an accurate local oscillation frequency f6 is obtained by varying the frequency value N, such as FilOOkHz.

For example, if you look at the case of AM subscribers in the Tokyo area, when you subscribe to Tokyo Broadcasting System (TBS) 95411z, you will receive AM
Since the intermediate frequency is 450kHz, the local oscillation frequency f
aFif @ = 954 + 450 = 1404kllz, at this time, the reference oscillation frequency fr is fr = 9kHz, so the programmable frequency divider 90 minutes is N = child =? =15'
That's a good thing. At this time, the station you were receiving until then is another broadcast station, for example HNI4KMI (broadcasting frequency 594kHz).

If the local oscillation frequency is 1044k&), the programmable frequency divider 9 is forcibly set to 15 and K, so the output 044 frequency fm of the programmable frequency divider 9 is t* = 156 = 6.7k b, which is lower than the reference oscillation frequency fr-" 9 kilz. A loop operation is performed to increase the output (DC control voltage) of the ninth phase 1-phase comparator 10, and the oscillation frequency fa of the local oscillator 6 increases. .And the programmable frequency divider 9
When the frequency obtained through twhdE reaches 9kHz, the output change of the phase ratio *alO stops, the @can frequency of the local oscillator 6 is locked, and the frequency becomes K so that Tokyo Broadcasting System (TBS) can be received. Injured light M in such AM reception
Taking the Tokyo area as an example, the division value N for the number of stations is shown in Table 1 below.

S Table 1 On the other hand, in the case of FM reception, it is the same as the above-mentioned AM reception, but in the case of FM reception, the output frequency #L number 4 of the local oscillator 6 is set in advance because the broadcast frequency #L number is high. In the grease scaler 7, the frequency is divided into, for example, 0, and the programmable frequency is inputted to the frequency generator 9 as the frequency f. Also, as the reference oscillation frequency fr from the frequency oscillator 8, fr =. 5 kHz is used.

Now, if we receive FM Tokyo (broadcasting frequency 80.0 MHz, local oscillation frequency 80.0-10.7 = 69.3MHz) t-, the output frequency f@ of Griskey-27 is, = 6
930 = 3.465 MHz, which is the frequency division value N set in the programmable frequency divider 9 to select this FM Tokyo.
Therefore, by setting this 11z branch value N=693 in the programmable divider 9, it is possible to receive FM Tokyo. Taking the Tokyo area as an example, the frequency division value N for the FM reception button is as shown in Table 26 below.

2nd #! To explain the configuration shown in the figure again, the channel division value N is input to the programmable channel divider 9 of the PLL II based on a channel selection operation command from either the 12Fi automatic station selection button 159, manual channel selection button 16, or preset channel selection button 17. Control σ to be set
- 2, 18 is a frequency common throughout the country - A memo in which the station name data of the broadcasting station used is stored in correspondence with the frequency divided by nine values NK according to the broadcasting frequency IJ, 13Fi The broadcasting station name shown in Table 1, 211C above A driver 14 converts the broadcasting station name data successively outputted from the memory 18 into a display signal in accordance with the corresponding branch value N and outputs the signal. Dot matrix display section KX for broadcasting station names from given memory 18
Furthermore, 3° 20, which is a display device for displaying characters, is a nine memory group with memory numbers 20a to 20n, and each of the memories 20a to 20m of this memory group 20 is divided so that broadcast frequencies do not overlap. Reception area 44
For example, the Kanto area, the Tokai area, and the Nakoho area.

It is divided into areas such as Osaka. Therefore, memory 2
0a~20n each KFi, divided! Station name data of a plurality of broadcast stations existing in the area are stored in correspondence with the broadcast reception frequency, that is, the frequency division value NK set by the controller 2. Between this memory group 20 and the controller 2, there are KFi and memo IJ 20 a to 2.
A memory selection switch 22 having switching contacts corresponding to the number of 0n is provided, and by operating this memory selection switch 22, one of the memories 20a to 20n of the memory group 20 is selectively connected to the controller. The data of the broadcasting station name stored in the selected memory can be tracked.

Next, the present invention will be explained in detail. For example, if you are driving in the Kanto area, you would switch the memory selection switch 22 to memory 20aK, which stores the names of broadcasting stations in the Kanto area, for example, and select and connect the memory 20m and the controller 12. do. If you operate the automatic tuning button 1 and select 9 while FMFM reception is being changed, an automatic tuning command is output to the controller 12, and the controller 12 selects the lowest FM reception/reception frequency number, 76.
A division value N that increases sequentially is set for the silogram pull frequency divider 9 so as to sweep the frequency from MHz to the shrimp height value 90M1lz. According to the setting of this division value N, the phase comparator lO outputs a voltage control signal to the local oscillator 6 to sequentially increase the local oscillation frequency, and the local oscillator JII
Based on the reception level detection signal when the ninth local oscillation frequency i = 69.3 MHz for receiving fiFM Tokyo Broadcasting is reached by sweeping the IIL number f, the sweep of the controller 21 is stopped and the local oscillation frequency fa6 is The outgoing palanquin wave number is 69.3Mh
Kt! and receive FM Tokyo. At this time, the frequency division value N output from the controller 12 is N=693 (see Table 2 above), and the memory selected by the memory 18 and memory selection switch 22 is selected based on this division value N. IJ20aK was given a data succession order, and for FM Tokyo, a nationwide memo 1718 was issued.
Since the K station name data is stored, the branch value N =
693, the station name data of FM Tokyo is read out, converted into a display signal by the driver 13, and displayed on the display 14.
) is displayed.

The display operation of the broadcasting station name at the time of tuning is the same when the manual tuning button 16 or the preset tuning button 28 is operated.

On the other hand, if NHK Urawa (broadcasting frequency 85.1 Mb, frequency division value N = 744) is received as shown in Table 2 by operating the automatic channel selection button 15, NHK Urawa's service area is in the Kanto area. Since the data of the broadcasting station name is stored in the memory 20aK of the memory group 20, the frequency division value N=,74 set by the controller 12 is stored.
4, the data of the NklK Urawa broadcasting station name stored in the memory 201 is read out in response to the 9 address command.
1 “rNHK Urawa” on the display 14 via the driver 13
The characters will now be displayed.

If you are driving a long distance using the Tomei Expressway, you can switch to the driving area by operating the memory selection switch 22 of the vehicle.
Memory selection switch 2 from memory 20g to 2On
A memory corresponding to the switching position of 2 is connected to the controller 12, and the portion Ji! set by the controller 12 for performing broadcast reception 4#i at that time is connected to the controller 12. d*N, the data of the broadcasting station name stored in the memory is read out and displayed on the display 14.
K so that it is displayed.

As explained above, according to the present invention, in a device whose configuration is to read data of broadcasting station names stored in advance based on the receiving frequency and to display characters, different broadcasting stations using the same frequency can be used. Station name data is stored separately in a plurality of memories provided for each predetermined area, and is used to display station names depending on the driving area.

Since the memory is selectively operated, even if multiple broadcasting stations are using the same frequency, the names of broadcasting stations that differ in each area can be displayed correctly.
Long/short #ll Appropriately display the reception station name on the bicycle while driving.
/C If you can do it, you will have a solution.

[Brief explanation of the drawing]

The figure is a block diagram showing one embodiment of the present invention. l...Receiving antenna 2...High Ird wave amplification circuit 3...Mixing circuit 4...Intermediate frequency amplification circuit 5
...Detection circuit 6...Local oscillator 7...Prescaler 8...Frequency divider 9...P-grain I-pull divider 10...Phase comparator ゛ 11...PLL circuit 12
...Controller 13...Driver 14...Display 15...Automatic tuning button 16...Manual tuning button 17...Preset tuning button 18, 20a to 20n...-Memo i) 20
...Memory group 22...Memory selection switch patent applicant Nissan Jikan Co., Ltd.

Claims (1)

[Scope of Claims] A device K that reads data of a broadcasting station name stored in advance in a memory in correspondence with the Hanawa number and displays the data in characters based on the receiving frequency when receiving broadcasting, A vehicle characterized by having a plurality of memories for storing station name data of broadcasting stations for each predetermined region, and a selection means for selecting one of the plurality of memories according to the driving area. radio receiver.