JPS5870616A - Display circuit for reception state - Google Patents

Abstract

PURPOSE:To display the tuning state between a frequency received at present and neighboring broadcast frequencies, by counting the intermediate frequency from an intermediate frequency amplifier with a counter, in a radio receiver to know the degree of shift to a normal intermediate frequency. CONSTITUTION:Electromagnetic waves caught on an antenna 11 are selected through resonance at a harmonic tuning circuit 12, transmitted to a mixer 13, mixed with a local oscillation frequency of a local oscillator 14, outputted to an intermediate frequency amplifier 15. The output of the amplifier is fed to a detector 16 and applied to a frequency counter 19, where a frequency is counted and the counted value is loaded to an intermediate frequency range discriminating circuit 20. The circuit 20 discriminated the range of a shift (the shift might be about 455kHz) depending on the degree of the tuning frequency shifted to the frequency of broadcast electromagnetic waves and outputs the result of discrimination to a display control circuit 21. Further, an output of the amplifier 15 is detected of its strength of electric field, at an electric field strength detection circuit 18, and an output of a control circuit 21 applied to a display 22 is controlled by said electric field strength and the discriminated output is displayed when the electric field strength is a prescribed value or over.

Description

[Detailed Description of the Invention] This invention provides a radio receiver that determines whether it is tuned correctly to the frequency of the signal station it is receiving, or if it is out of tune. The present invention relates to a receipt display circuit for displaying a receipt.

Conventional reception status display - Suit using path - Hete p dyne reception g! ! Circuit vi - shown in Figure 1 T0 In this figure %
1 is an antenna, and a high frequency radio wave #jLIW1 captured by this antenna 1 is selected for resonance by a tuning path 2 and sent to a mixer 3. The mixer 3 also receives a local oscillation frequency (signal) from a local oscillation signal 4. The mixer 3 generates an intermediate frequency from two signals: this local oscillation frequency signal and the fIc wave signal selected from the iIl harmonic Pl thoracic passage 2, and outputs it to the intermediate frequency amplifier 5.

The intermediate frequency amplifier 5 amplifies the signal inputted 1-1 to fc
After that, it is output to the detector 6. The detector 6 demodulates the audio signal from the input signal and outputs it to the output terminal 7. In addition, a signal is output from the intermediate frequency amplifier 5 to the electric field strength detection circuit 8, and the strength of the received frequency (2nd N(b)) t-j
iff, and outputs the result to the display control circuit 9. The display control circuit 9 also receives a detected DC component (FIG. 2(a)) from the detector 6. Display control I41 (b) road 9
is the four shaped parts shown in Fig. 2 (C) (Fig. 2 (CJ A * B * Ct D ) Y
t judgment and control is divided into 1Ot4 states.

FIG. 2(C) Six examples of dots corresponding to OA, B, C, and D are shown in FIG. (d) and (e) in Figure 3?
(f) and (2) are glues A and B in Fig. 2 (C), respectively.
, C, and the three rectangles in FIG. 3 indicate indicators. Diagonal inside the rectangle? iMt minus means that the light is on, and a blank field means that the light is off.

With this display formation, when there is no radio wave from a broadcasting station near the frequency currently being received (2nd fV(C)', D range), all three displays are turned off (Figure 3(d)), When the currently received frequency is slightly below the radio wave Q (
In the second area (c), only the left side of the three displays is lit (Fig. 3-)). Also, when the currently received frequency is slightly above the radio waves of the broadcasting station (![211(
c), In C range 8), only the right side of the %3 display lights up (5ai (2)), when the radio wave of the broadcasting station exactly matches the frequency currently being received (at the optimum tuning point). Evening, zm
For (c) *B range), only the center of the three displays lights up (Fig. 3(f)).

Therefore, such a display method can be displayed as an S meter or a g-took indicator of a receiver.

However, the conventional circuit like O above has %AM.

Butterfly 2ml when demodulating amplitude modulation signals such as Lw and sw
(a) Since the S-curve characteristic shown by mIt cannot be obtained, it is impossible to display it, and therefore, it often has the disadvantage that it can only be used in one way for receiving FM (frequency modulation signal).

This departure Ij1m was made in view of the above points, and M,
Like O amplitude modulation signal such as LW, 8W, etc.
It is an object of the present invention to provide a reception line display (b) that can determine the same shape mk and indicate this by displaying, for example, three dots, even if the S curve characteristic cannot be obtained in the following.

In other words, this 8A signal is 2Geo high when receiving all the broadcasting station radio waves in the vicinity! 11. A phenomenon in which the frequency of the harmonic tuning circuit's output shifts toward the frequency of the broadcast station radio waves due to the resonance characteristics of the harmonic tuning circuit, and is therefore slightly deviated from the intermediate frequency or normal frequency.

In other words, the intermediate frequency is extracted from the intermediate frequency amplifier, this frequency is counted by a frequency counter, and the tuning state of the currently received frequency and the nearby broadcasting station frequency is determined by how many degrees it deviates from the regular intermediate frequency. Determine and display the t-feature.

Embodiment t'' of the present invention will be described below with reference to the drawings.
The figure is a diagram showing an embodiment of the present invention.

In this figure, 11 is an antenna, and the radio waves captured by this antenna 11 are resonance-selected by an island-wave tuning circuit 12 and sent to a mixer 13.

The mixer 13 includes one local oscillator 14 in addition to the selection signal.
The local oscillation frequency (signal) is input from

The mixer 13 creates an intermediate frequency from these two signals and outputs it to the intermediate frequency amplifier 15. The intermediate frequency amplifier 15 amplifies the input signal and then outputs it to the detector 16. The detector 16 demodulates the input signal and outputs the audio signal to the output terminal 17.

In addition, the intermediate frequency amplifier 15 outputs a signal (511k) to the spot field strength detection circuit 18, and the field strength of the received frequency is measured by the field strength detection signal 18, and the display control g
An electric field strength detection signal (5th wA (a)) is output to path ii 21.

According to Niro, the intermediate frequency has the following characteristics. -As an example, let's talk about AM radio.

The state that the radio has received the signal completely -%
When ILt is not being received, (local oscillator 140 output frequency) - (high frequency tuning example circuit 12 output frequency) =
It becomes 455 KHz.

However, if the radio is not receiving the broadcasting station signals,
For example, the airwaves reach 600 phantom mouth and are currently 599KH.
When the same hook is set as zz or 601 KHzVc, the operation is as follows.

That is, the local oscillator 14 has a reception frequency of 1054 KHz (reception frequency 599 IG(z), -J or 1056 KH*(
The received chest wave frequency is 601 KHz). However, high frequency tuning times 12! The output frequency of r12 is 599 phantom mouth or 601
KHz, but the phenomenon of being drawn to the frequency with the strongest resonance characteristics (the frequency where the broadcasting station is located) is ulta, 59
9 KHz is 599.9 KHz, also 601 KH
za 600. Try to approach 600 KHz, such as I KHz. Therefore, the intermediate frequency is not 455 phantom, and when the receiving frequency is 599 KHz, even if tf
454.11G(z(1054KHz-599,9KH
z = 454.1 KHz), the receiving frequency is 6
For example, when Q I KHz is 455.9 KHz
(1056klJlz-600,111Jlz= 4
55.9 KHz) At night, the frequency is different from 455 KHz. An embodiment of the invention utilizes this phenomenon.

Therefore, the intermediate frequency signal om from the intermediate frequency amplifier 15
It number (shown in FIG. 5)) is counted by a frequency counter 19, and a code signal corresponding to the counted frequency is sent to an intermediate frequency range determination circuit 20.

This intermediate frequency range detection circuit 20 divides the frequency fluctuation range of the intermediate frequency signal centered around the reference intermediate frequency (AM''I? 455 KHz) into a plurality of frequency zones, and detects the t-code for each zone. The intermediate frequency range determination circuit 20 determines which of the plurality of frequency ranges the output code signal of the frequency counter 19 falls into, and determines which frequency range corresponds to the corresponding frequency range. The aT code signal (FIG. 5(i), (i)) is sent to the display control circuit 21.

The display control circuit 21 receives the 0-pass signal (FIG. 5(i), (j)) from the intermediate frequency range determination circuit 20 and the electric field strength detection signal (FIG. 5(i), (j)) from the electric field strength detection (b) path 18.
lI5E(4), the four states shown in Figure 5(m) (
Display unit 22t divided into sa(m)on, r, q, a)
- control.

Control of the display 22 (3 dots) by the display control circuit 21
will be specifically explained using FIG. However, (n), (0), (pJ, and (q) in FIG. 6 correspond to E, F, G, and H in FIG. 5(m), respectively. A rectangle indicates a display 22, and a rectangle with a diagonal line inside means the light is on, and a blank one means the light is off.

It is assumed that there are no radio waves from a broadcasting station near the frequency being received (E@circle in Fig. 5(m)).

At this time, the electric field strength at the reception frequency is below a predetermined level, and the field strength detection signal (Fig. 5 (/J) is -O
I, the display control circuit 21 controls the display 22 to 3
Both displays shall be off (Figure M6-)).

Next, when the currently received frequency is detected on the slightly lower axis of the T-wave of the broadcasting station (range F in Figure 5 (m)), the electric field strength exceeds a predetermined level and the electric field strength detection signal is %ll. -, and the code signal (s N(i), (j)) from the intermediate frequency range determination circuit 20 is 101°%1l-
t-, the display control circuit 21 turns on only the left hook during the 3 display on the display 22 (FIG. 6(0)).

Next, when there is a frequency #lVc currently being received slightly above the radio wave of the broadcasting station (H range of 51st W (m)), the field strength detection signal is %II, and the code signal is 11
At a voltage of 19%Ol, the display control circuit 21
Of the 3 displays in 2, only the right side is lit (6th vA
position)).

Next, when the radio wave of the broadcasting station exactly matches the frequency currently being received (q range of '5 II (m)), the field strength detection signal is To at %II and the code signal is s
l I, %l# (2) 't'', display control circuit 21
Of the three displays on the display unit 22, only the central point is the phantom thigh (see Figure 6).

As described above, in the embodiment, even in a receiver using an amplitude modulation method such as AM, LW, or SW, display as a center chinning meter or a point indicator can be performed. Therefore, unlike the conventional OAM radio, which uses only a field strength meter to match the frequency of the broadcasting station, it is possible to completely match the reception frequency with the frequency of the broadcasting station.In the above embodiment, By the code signal shown in FIG. 5 (S, 0) and the electric field strength detection signal shown in FIG. 5 (4).

Although it is possible to control the display 22 corresponding to the range divisions E, F, G, and H in FIG. By generating the code signal T corresponding to each frequency area, the display 22 can be controlled as follows.

Then, as a code signal from the intermediate frequency range determination circuit 2o, 3-bit signals as shown in FIG. The signal is generated and one display control is performed once.J121-t- generates the 6-shape (7th signal) shown in FIG. Figure (X) construction.

The display device 22 is controlled separately for J, L, M, and N.

This control will be specifically explained with reference to kk81 [-.

However, (I), (J), (f), (g), CM), and ^) in Figure 8 are.

They correspond to I, J, and L, M in FIG. 7(X)(1), respectively.

In addition, the rectangles in Fig. 8 are shown on the display 22, and those with a diagonal at inside are dimly lit, t-1, and the blanks are off.
, the black one means that it lights up strongly.

It is assumed that there is no radio wave from a broadcasting station near the frequency currently being received (range I in Figure 7).

At this time, the electric field strength detection signal (Fig. 7 (b)) obtained by the electric field strength detection circuit 18 based on the signal shown in Fig. 87 (V)
is 10#, the display control circuit 21μ, the display 22
'Ni, 3! ! ! (Fig. 8 (1))
).

Next, under the radio wave of the broadcasting station - when it is currently being received (
FIG. 7 (J range of slope) shows that when the electric field is strong, the detection signal becomes %ll, and the OO-mode signal CM 7 m (s), (1, (u)) from the intermediate frequency range determination circuit 20 becomes %ll. O
Since I9% Q I, % Q #''e exists, the display control circuit 21 strongly lights only the left side while the display 22 is showing 3iM (8th -σ)).

Next, when the currently received frequency is slightly below the broadcasting station (Figure 7), the electric boost strength detection signal is 111, and the code signal is % II, % OI 1%.
Therefore, the display 1iIll1 circuit 21 dimly lights both the left and center of the three displays on the display 22 (FIG. 8(K)).

Next, when you are receiving radio waves from a broadcasting station (
The N range in Figure 7 (X) is the electric field strength detection signal.
#"t'ah!, 11 and the code signal is %Ol.

%111%ll, the display control circuit 21 turns on only the right side of the three displays on the display 22 (FIG. 8(N)).

Next, when you see the frequency that is currently being received slightly above the radio waves of the broadcasting station (M range in Figure 7).

The electric field strength detection signal is %11, and the code signal is %
Since Ql, %lI1%O1, the display control N path 21 dimly lights both the center and right side of the three displays on the display 22 (#g8 (9)).

And when the radio waves of the broadcasting station exactly match the frequency currently being received (LWIQ area of 71st Mk).

If the electric field strength detection signal is %ll and =-do signal %
Since l #, % l I, % O1, the 1 display control circuit 21 sets only the center of the display 2203 to a seven-strongly lit state (5th lN(L)).

Therefore, compared to the control method (display method) described above, this control method (display method) is more precise than the control method (display method) described above, even in the same three-dot display.
*It becomes possible to recognize the

In addition, regarding the fourth cause, the antenna 11. High frequency 1t!
j1i1m enclosure 12. Mixer 13. A local oscillator 14° intermediate frequency amplifier 15 and a detector 16 constitute a suit-couple hetero gain receiving circuit.

Further, the intermediate frequency range determination circuit 20 is specifically composed of a decoder circuit.

As detailed above, the reception status display circuit of the present invention has the following features:
Rather than relying on 8-curve characteristics, it is possible to simply tune the signal obtained by the intermediate frequency and strong electric field.
Since it is possible to obtain an indicator Rk as a meter, etc.,
Complete identity can be confirmed even with receivers using a method other than FM modulation, making it 1% more widely used in general receivers! can be used.

°4, Brief description of the drawings Figure 1 is a block diagram showing a superheterodyne receiving circuit using a conventional reception status display circuit, and Figures 2 (a) to (
C) is a diagram for explaining the operation of the WJ1 circuit, 3rd
Figures (d) to (2)) show an example of displaying a receipt A in the conventional system; - (2)) is a diagram for explaining an example of the operation of the embodiment, FIG. 6 (11)
~(q) is a diagram showing an example of displaying a receipt m according to an operation example, and TIN(r)~(TIN) is a diagram for explaining other operation examples of the embodiment, and FIG. 8 CI)~(N) is a diagram showing an example of reception status display according to another example of operation.

11...Antenna, 12-・High-volume LSI! 11 circuits, 13...mixer, 14...local oscillation! , 15-
...Intermediate frequency amplifier, 16-...Detector, 18-...Field strength detection circuit, 19...Frequency counter, 20-...
- Intermediate frequency range determination circuit, 21--Display control circuit 1, 22--Display device.

Patent Applicant: Oki Electric Industry Co., Ltd. Figure 2 Figure 3 (6) Hibiguchi (. 艷口口371 ro 口, 9) Rollo Date Figure 8 Figure 7 Procedural Amendments March 31, 1982 Haruki Shimada, Commissioner of the Patent Office, 1, Indication of the case, Showa Era 6, Patent Application No. 16859 () No. 2, Issuance v40 Name Receipt M* Indication Circuit 3, Person making the amendment Relationship with the case Patent Applicant (029) ) Oki Electric Industry Co., Ltd. 5. Date of amendment order: 1925, month, day (voluntary) 6. Target of amendment 7. Contents of amendment 1) ``Suits Ya-'' in line 10 of page 2 of the specification 'IN' is corrected to ``rFM Super''.

2) On page 5, line 1, "rmo" is corrected to "ni".

3) Correct page 10, line 6 r (g) J to r (q) J.

4) rFM modulation method on page 14, line 16, line 17...
...You can check and delete all.

Claims (1)

[Claims] [11 High Frequency 1 of Hetero Gain Receiving Circuit! I
A frequency counter that outputs a code signal that echoes the frequency el of the intermediate frequency signal affected by frequency fluctuation due to the resonance characteristics of the IN circuit and the frequency of the hId intermediate frequency signal, and a reference intermediate cylinder wave number is set to the center of all The frequency fluctuation range of the intermediate frequency signal is divided into a plurality of frequency ranges, each range in parentheses is converted into a code signal and stored in advance, and the output code signal of the frequency counter falls into which frequency range of the plurality of sets. mosquito'! rf (I) and an intermediate frequency range determination circuit that outputs all code signals that are compatible with each other in the frequency range;
an electric field strength detection circuit that detects electric field strength at wave numbers;
This detection path is based on the electric field strength detection signal output multiple times and the code signal from the intermediate frequency range determination circuit! A display control circuit that controls the l1 display in the form of multiple V1 numbers and t-A
Receipt letter 11 display Tsumugiji. (2) The intermediate station wave number range 1 judgment circuit is a decoder path.
thing! Features%1PFIi11 Reception status display (gI#&) as described in item 1.