JPS58206224A - Receiving device - Google Patents

Abstract

PURPOSE:To receive assuredly a broadcast, by converting a control circuit into a receiving device incorporating a scanning means which divides a receiving frequency band into plural parts and then scans an optional or specified one of those divided frequency bands in order to find out quickly a broadcast station as well as to control the scanning direction and the sensitivity within the corresponding band. CONSTITUTION:When a scan in desired to a specific band, the 3rd band-based scan key III is pushed by means of a key 30 if the reception of a broadcast is first desired while traveling since the broadcast station is generally within a range of about 1,000kHz, for example, in Japan. Then a controller 29 scans the key III and sets a flip-flop 28 and designates a band 3 via a control line 29' (10 to be delivered in the case of a 2-bit line). Therefore, the dividing ratio N is counted up at a place corresponding to a frequency 1,062kHz, and 1/4 lower left parts glow successively with a display 33. Then sensitivity selecting switches C1, C2, C3 and C4 select the receiving sensitivity and then switch the reference voltage 24' of an analog comparator 24.

Description

[Detailed Description of the Invention] The present invention particularly relates to an electronic scanning type receiving SIt, which allows the frequency of a target broadcasting station to be generally known, and which can be carried when traveling or the like and quickly find a broadcasting station at any time of the day. L L (Phase Locked Loo)
p) Frequency v ense”)-if method, !: Ka D A C
(digitalt.

an2Ll! ogue converter) Electronic scanning type radio receiving devices such as magnetic pressure synthesizer type are becoming available. These receiving devices have an automatic channel selection button, and in order to find the desired broadcasting station and display it, all you have to do is press the automatic channel selection button to start scanning. However, with such a receiver, the reception frequency range (in Japan, AM is 551KH2 to 160KH2)
2KH2) 17) From low frequency to high frequency e1. Only large, high-end receivers allow direct input of the desired frequency; portable or car-mounted receivers are not used because they are expensive and require an increased number of operation buttons. Therefore, in this sequential scanning, if the desired frequency is far from the position currently being scanned, the user must wait for the sum of the scanning time and the pause time when another station is found. irritating. Roughly, in sequential scanning, the center of the high-frequency signal's cloudiness may shift toward the higher side for signals with weak magnetic field input, and when scanning from the higher frequency side, tuning stops, but when scanning from the lower frequency to the higher side. Then, it is often convenient for the station not to be selected.

The present invention is intended to improve the above-mentioned VC, and also takes into consideration the fact that in Japan, open frequencies are unevenly distributed in each region. As a reminder, the present invention will be explained in detail below based on examples.

The first factor is a block diagram of a radio receiving apparatus according to an embodiment of the present invention, taking a PLL type case as an example.

(11 is a receiving circuit that receives broadcasting, and high frequency amplification and amplification of the signal received by antenna music...1), mixer tt'J, and inter-Ko frequency amplification device (13 is the process of Kenpo processing Vcw, and mixing The frequency of the local oscillator (14) introduced into the oscillator [13 is connected to the programmable divider 8 n5i between N5+ (minute ratio N# will be described later), and the signal obtained between the NO and the oscillator ■ using a crystal oscillator etc. A phase comparator compares the phase with the high-precision reference signal obtained, and feeds it back via a low frequency filter (L7) to lock the N-divided signal to the absolute phase.

(2J) This provides the above-mentioned minute ratio N in the i control circuit. It is a scanning signal that converts the signal obtained from the C body oscillator ■ through a branch divider (〃, game) (23!), but it is composed of an up-down frequency converter that can set the initial value, and its output (the above-mentioned branch ratio N) is of the parallel type and is given to the programmable frequency division period 51.
Ru. 124) This is an analog comparator that determines whether or not the medium frequency amplification signal of t1, 5 has been obtained above a certain value, that is, whether or not the broadcast waves have been received. ■ is a memory that corresponds to the division ratio (MINl, MI
N2, MIN :5, MIN4), minute ratio corresponding to high frequency (MAXl, MAX2, MA)l, MAX4)
oh! and 1 bit corresponding to the broadcast station (F'l, F2, F3
, F4). 12G is a digital comparator that compares the minute ratio selected from the memory with the above-mentioned minute ratio N (ffi7a) (27b) (27c)
outputs a selection from a number of inputs (or outputs) (
or input).

[Yes] is a T type flip-flop, 12g#
Scan the makie ■, and the above mentioned T game) (23 (
27a) (27b) (270) A controller that gives control to the four memories. Direction key (or at least full scan key), Band scan key (1) (1) @GV
).

and switch for receiving sensitivity selection (CI) (C2)
C05) (04) is included.

(3) is a display device, which consists of a decoder t311 that decodes the division ratio N which is the output of the scanning force sensor 211, and a driver (support) that moves the display (to).

For example, as shown in Figure 2, this display device consists of a polarizing substrate (with a transparent electrode) sandwiching between nematic liquid crystals twisted at 90 degrees. It is a light-receiving type liquid crystal display.The display content, that is, the pattern of the transparent type m(to)-...・
They are arranged in a circular shape so that the center is on the extension of... to form an analogue display section, and further have nine auxiliary display sections (to) (to)... provided by printing or the like. The bar-shaped picture elements c3n@・- are made thicker and longer every 10, making 12 in total.
: There are 0 pieces. Rod-shaped picture element C(7)(
9) - are selected and lit in sequence, but if we take AM as an example, the frequency is 9K between 551KHz and 1602KH2.
H2: b@1ci) 14 stations are allowed, so the number is 120, and there is a one-to-one vC correspondence with the picture element (3D@...).And since it is circular, it is divided into four, especially fl
& The four frequency bands correspond to 174 yen, and it is clear that the frequency range is 531KH2, (M
AXl) and (MIN2) are 792KHz, (MAX2
) and (MIN3)) t1062KHz, (MAXS) and (MIN4)? 532 KHz, (MAX4) becomes 1602 KHz. tsl, :met end()%J, tJf(MAXl) and (MIN2)] of each frequency band may be separate, but even if they overlap as in this example, j r e
In the case of F M ('), opening is allowed every 100KH2 between 76MH2 and 90MH2, but 78M
Since it is not opened at all below Hz, if you set it to display between 78 MHz and 90 MHz, the number will be 120, which corresponds to the picture element L(η(9)・-.The frequency band is from 76 MHz to 90 MHz. It may be divided between 78 MHz and 90 MHz (D).

(4) With the old signal wave circuit, obtain the output of intermediate frequency amplification (13), detect it with 41, and detect it with low frequency amplification (421) so that the speaker f4G etc. does not sound.

Since the receiving circuit (1) and the low frequency circuit (4) may be the same as the conventional ones, the operation of the receiving apparatus of the present invention will be explained focusing on the control circuit (2). First, if you want to scan a specific band, for example in Japan there are generally broadcast stations around ICloKHz, so if you are traveling and want to listen to the broadcast first, press the 3rd band specific scan key (1). Then, the controller scans it and sets the flip-flop [Yes], and specifies band 3 with the control line t2'JK (outputs 10 if it is a 2-bit line). Sets the flip-flop 4 (outputs 10). H), in memory 4, MAX@ is specified and the scanning counter (2JJ becomes Abupka Kunta).

Well, +: Control line (2! #Yoshi select game) (27a
) (27b) targets the memory (F3), and the select gate C2703 sets the scanning counter (2I) to 1iiiivc for the memory G (M1N6), and the memory fields set the (MIND) (MAXI) pair. Access the digital comparator @.Depending on this access and selection of flip-flop t28i (MAX 5
) #i Output to digital comparator ■.

Next, all the inputs to the gate 1231 become H, and the output of the oscillator (2) is sent to the scanning circuit 1211Ks4n via the divider N23&. As a result, the frequency division ratio N is counted up from the point corresponding to the frequency u1062KHz, and in the display 4, the lower left quarter of the second section (aJ) lights up sequentially.
If there is an IC broadcasting station (NHK No. 2), the output of the intermediate frequency multiplier σ3 will increase, so there will be an output from the analog comparator, and one of the inputs in the gate area will become L due to the controller, and the scanning counter will be output. (The 2D counting operation stops. At the same time, the value (F3) of the memory (2) becomes 1 through the select gate (27b).

If necessary (for example, when a key is pressed to continue scanning), the controller (231) is input H again, and the scanning counter (21) continues counting. When the frequency division ratio N becomes a frequency division ratio corresponding to a frequency of 1552 KHz, the digital comparator determines that they match and outputs an output. Shortly after this, the gate 1 inputs an L input, and the scanning counter (211 stops counting, and the flip-flop 1 becomes L.) With the operation of this flip-flop, the scanning counter (!v becomes a down counter and h, ] f: If i29 is placed on the MIN side, (MIN!,) is introduced into the digital comparator 2 mark, and the judgment match is broken, so the gate (the input becomes H).

In other words, in the @ work mentioned above, the set meal key (b) by band? Oshichoji de 1
Scanning starts at a higher frequency from 0.062KHz,
When the frequency reaches 1552KH2vc, scanning is restarted toward a lower frequency. When at least one broadcast station is found, the 1 bit (F3) of the memory (2 bits) is set to 1. This 1 bit is a flag indicating whether or not the broadcast station is in that frequency band, and is sent through the select gate (27a). It is led to the control terminal of the splitter and switches the splitting ratio into two stages.That is, if the content of 1 bit is 0, there is no broadcasting station, and the splitting ratio is lowered to perform a high-speed sweep. If this is the case, it is possible to prevent scanning errors when the station is opened at a nearby wave number by increasing the division ratio and sweeping at a low speed when there is a broadcasting station. Therefore, if the sweep speed is not changed, select game) (27aJ ( 27b) and Himemo!J (25i
) 1 hit (FIJ (F2)C15)C14) is not required.

When the other band scanning keys (1), (II), and (ff) are operated, the operation is the same, except that the selection of memory [with] is different. Also, take note when the full scan key 0) is operated! 1(2
The rest is the same as the above example except that the division ratios CMIN1) and (MAX4) of 51 are accessed seven times.

Next, the sensitivity selection switch (01) (C2) (C3) (C4
) will be explained. This selects the reception sensitivity and switches the reference voltage of the analog comparator 124. In other words, conventional radio's DX (for weak electric field) and I, 0CAL.
It corresponds to the switching switch t (for strong electric fields), and it can be used with one switch, but it is possible to change the sweep electric field strength only in a specific band, especially when scanning the entire band, by using four switches to correspond to the band. , preset memory (not shown) vc
This is especially effective when presetting broadcast stations.

Finally, I will explain 1 about display devices and frequency band division.
I will clarify. In the case of television, the receiving frequency range is assigned to a channel, but in the case of radio, as mentioned above, the reception frequency range is simply specified by the number of waves between stations. In Kube l and Osaka, there is one station covering almost the entire band,
For example, in Sapporo on AM, NHK@1 is 687KHz, NH
K No. 22> (747KH2 Hokkaido Broadcasting; 51287KH
2. Sapporo TV has a frequency of 1,440 KHz and is not available in the central frequency band. Similarly, FM broadcasts are unevenly distributed, and this tendency is particularly strong in rural areas. Therefore, the frequency range is 1
000KHz (or 80MH2) or higher and 80MH2 or lower, scanning can be done quickly even if you divide the VC into two parts. However, if the frequency is divided into 7 or more, the frequency band for one station or less will increase in each frequency band, and it will be difficult to input data using a numeric keypad and the cost will be too high. Judging from the distribution of station openings and ease of use, it is preferable that one division band ec1 to several stations apply, so 2.5.4 division is most preferable. Just in case, if you display these river wave numbers digitally (signs), you will be able to see which band is being scanned only when scanning only within the divided bands.
Especially when you sweep the force at high speed, you can't tell if it's coming up or not.

Therefore, when it is divided into 2 or 6, it can be recognized by the most significant digit, so a digital display may be used, but as in the above embodiment, i/(
Nine display, in which one picture element corresponds to one station, is most preferable, and analog display, in which a large number of picture elements are arranged, is generally preferred.

As described above, the present invention includes a receiving circuit for receiving broadcasts, a low frequency circuit for detecting and amplifying the output of the receiving circuit, and a control circuit Wr for instructing the receiving circuit to control the wave number between receptions. !
ll! ! Since it is a receiving device equipped with a scanning means that divides the borrowed frequency range into multiple parts and scans arbitrary or specific frequency bands, it is possible to quickly find a broadcasting station.
Furthermore, since the scanning direction and sensitivity can be controlled within that band, broadcasts can be received reliably.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a radio display device according to an embodiment of the present invention, and FIG. 2)...@Tokai Raku, 133-
Display device, (4)...1 Mr. I Shiba 1 Kawaji, (Wholesale...
Scanning force Kunta, C24I...analog comparator, prisoner--memory, (excellent...digital/L/'
:ff n/(L/ -ta, (27a) (27b) (2
7C)--Select gate, (to)...Pre-lag prop, field--Controller, ■...Key, [Yes]
···display. Figure 1 Figure 2

Claims (1)

[Claims] (1) A receiving circuit that receives broadcasting and an output of the receiving circuit? It is equipped with a low frequency circuit that detects and amplifies the wave, and a control circuit that instructs the receiving circuit to receive the frequency. A receiving device characterized by a liaison equipped with. (2) The receiving device according to claim 1, wherein the control circuit is provided with a large number of picture elements arranged in correspondence with the wave number of the receiving station and is connected to a tiger display device. 13) When the scanning means scans the divided one-station wave number band M, it performs a first scan that scans from a lower frequency to a higher frequency within the band, and a second scan that scans from a higher frequency to a lower frequency within that band. 2. The receiving device according to claim 1, further comprising scanning direction switching means for alternately performing scanning and emesis. (4) @fertilizer a1 Betsuro is characterized in that, when the set meal means scans the divided frequency bands, it is equipped with a 1g degree designation means that can select different reception sensitivities depending on the band M. Receiving device described in range 1 QI. +5] The receiver A device according to claim 1, wherein the number of divisions of the receiving frequency range is 2 or more and 6 or more.