JPH01149514A - Automatic memory system for receiver - Google Patents

Abstract

PURPOSE:To listen to a broadcasting station in which a reception condition is good and, simultaneously, to continuously listen to the broadcasting station which is listened to before an automatic memory is started by memorizing frequencies in the order of the quality of a reception sensitivity and, simultaneously, returning to the frequency of the time of a start when not a single station is memorized. CONSTITUTION:The output of an IF amplifier 2 is inputted through a level detecting part 8 and an A/D converter 9 to a CPU 10. The CPU 10 obtains a reception field strength by such a signal. Next, the field strength of the reception frequency tuned by looping the reception frequency is memorized into the memory in the CPU 10 in the order of the strength. At the time of a loop action completion, when the memorized station exists, the station to have the field strength which is the strongest among the memorized ones is made into the reception frequency. On the other hand, when not a single station is memorized, the return to the frequency at the time when the loop action is started is executed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an auto-memory system for a receiver, and particularly to an auto-memory system for a vehicle-mounted receiver.

[Conventional technology]

In general, the auto memory system of conventional car radio receivers is such that when the auto memory mode setting key is pressed to activate the auto memory device, the frequency changes from the lowest frequency of the receiving band to the highest frequency, or vice versa. It is stored in each memory section in the order of the reception frequencies selected. During this memory operation, the frequencies previously stored in the memory section are erased and are stored in each memory section in the order in which they were received. The data will be stored in memory sequentially starting from the top. When the frequency is increased or decreased once, the frequency is tuned to the frequency in the memory section that was first stored, for example, during the auto memory operation.

[Problem to be solved by the invention] By the way, in the automatic memory system of the conventional car radio receiver described in E, the received frequencies selected by increasing or decreasing the X frequency are sequentially stored in the memory section. Since it is stored in memory, if there are more reception frequencies (broadcasting stations) than memory sections (preset keys), the reception frequencies selected later will not be stored in the memory section, so reception sensitivity will be good. Even if it is a broadcast station (major broadcast station), if you select a station with poor reception sensitivity first, you may not be able to preset the main broadcast station with automatic memory operation, so you can eliminate the need for broadcast stations with poor reception sensitivity. There was a problem in that it meant that it was being memorized.

Also, when the auto memory operation is finished, the highest or lowest receiving frequency in the band is selected regardless of whether there is a broadcast station, so if there is a station that is automatically memorized, you can listen to the memorized station and do not listen to any one station. If auto-memory is not performed, if you want to continue listening to the broadcast station you were listening to before auto-memory operation, you will have to search for that station, which is a problem.

Therefore, the present invention has been made in view of the problems of the related art and to solve this problem.The present invention is made to memorize the frequencies in order of receiving sensitivity. The purpose of the present invention is to provide an auto-memory system for a receiver that uses the station with the strongest electric field strength as the reception frequency, and returns to the frequency at the start of auto-memory operation if no station is memorized. There is.

[Means for solving problems]

In order to achieve this purpose, the automatic memory system of the receiver according to the present invention provides a plurality of preset keys, a memory section corresponding to the preset keys, and loops the reception frequency to record the selected reception frequency. The electric field strength is memorized in descending order of strength, and if there is a memorized station at the end of the loop dynamic, the station with the strongest electric field strength among the memorized stations is set as the reception frequency, and if no station is memorized, loop operation is performed. It is characterized by returning to the frequency at the starting point.

[Effect]

J: Since the configuration is as described above, the electric field strength of the selected reception frequency is compared with the electric field strength of the reception frequency stored in memory first, and the field strength is sorted in descending order of strength. Open a good broadcasting station. Furthermore, depending on the presence or absence of a memorized station at the end of the auto-memory operation, the receiving frequency with the strongest electric field strength is received or the frequency returns to the starting frequency.

〔Example〕

Next, an example of implementation of the present invention will be described in detail with reference to FIGS. 1 to 3.

FIG. 1 is a block diagram of an electronically tuned radio receiver implementing the receiver auto-memory method according to the present invention, FIG. 2 is a flowchart showing the processing of the receiver's auto-memory method, and FIG. 3 is a FIG. 3 is a diagram showing a memory state of a memory method.

In FIG. 1, an input signal of a broadcast wave coming from an antenna is amplified by a front end l. That is, this front end 1 has a high frequency amplification section and a part of a mixer, and uses this high frequency amplification section to amplify the high frequency signal of the desired broadcasting station to which it is tuned. Then, this amplified signal is converted into a constant intermediate frequency by a part of the mixer. This frequency conversion converts the received frequency and the local oscillation frequency by a certain frequency difference (
This becomes the intermediate frequency). In other words, the high frequency signal that has passed through the high frequency amplification section and the local oscillation signal that has been injected at an appropriate level are combined in a part of the mixer. This local oscillation signal is controlled by a PLL (phase locked loop) circuit 2 that digitally controls the local oscillation frequency, and since this local oscillation signal is changed in a certain step, the reception frequency is changed. Then, the intermediate frequencies outputted from a portion of the mixer are further selected and amplified by the IF amplifier 3. The intermediate frequency output from the IF amplifier 3 is reproduced into the original audio signal by the FM demodulation circuit 4, and further inputted into the stereo demodulation circuit 5, reproduced into a stereo signal, and output from the speaker 7 via the amplifier 6. . On the other hand, the output from the IF amplifier 3 is input to a level detector 8, which detects the level, converts the analog signal into a digital signal by an A/D (analog/digital converter) 9, and stores it in the memory. The signal is input to the built-in CPU 10, and the CPU 10 determines that a broadcasting station is present if this signal is at a predetermined level or higher, and uses this signal as the received electric field strength.

Further, 11 is a display which displays, for example, reception frequency etc. on an LCD based on various signals processed by CPU10. In addition, 12 is an operation unit, which includes six preset keys 12a, an auto memory key 12b, and an UP key.
Keys such as a start key 12c and a DOWN start key 12d are distributed to operate the receiver.

In addition, the preset keys NO, l to N006 are N in the memory.
O, 1-NO, 6, and in the memory method of the present invention, the received frequencies are stored in order from N001 to N096 in descending order of electric field strength, and by operating each preset key, each memorized frequency can be recalled. It will be in the received state.

This CPU 10 performs auto-memory processing as shown in FIGS. 2A and 2B, that is.

When the UP start key or DOWN start key is operated while the auto memory mode is set using the auto memory key, when the reception counter (STPCNT) is set to "0", the field strength (EFS (1 to 6)
) are all set to "0" and the input signal level of front end 1 is attenuated to lower the reception sensitivity, that is, set the reception sensitivity to LOCAL. Part 1
Determine whether the received frequency that has been stepped up or down is the same as the start frequency, and if not, determine whether there is a broadcasting station on that received frequency;
If there is no broadcasting station, increase the reception frequency by 1 step or 2 steps again.
Or DOWN.

Incidentally, when the UP (DOWN) of the reception frequency reaches the highest (lowest) frequency within the band, it continues returning to the lowest (highest) frequency.

On the other hand, if there is a broadcasting station on the reception frequency, the electric field strength (EFS (X)) is measured, and then the memory No.
MN) is set to "l", and the electric field strength (EFS (MN)) is calculated from the electric field strength (EFS (MN)) of this memory NO, (MN).
(X)) is smaller. If this is small, add 1 to MN and depending on whether MN is larger than 6, if it is small, then EFS (MN) > EFS again.
Check whether it is (x) or not. Also, if MN) is 6, the receiving frequency can be increased or decreased by 1 step again. On the other hand, if EFS (MN) > EFS (x), 1 is added to the value of 5TPCNT. STP
Check whether CNT > 6 or not. and 5TPcN
If T>6, the number of preset memories is only 6 stations, so 5TPCNT is set to 6" and this 5TPCNT
Input the value of 5TPCNT into the counter (CNT) and
Even if it is not >6, this value of 5TPCNT is input to CNT.

Next, as shown in FIG. 2B, it is determined whether MN=CNT, and if MN=CNT, MEMO (CNT-1) is set to MEM in order to shift the memory contents.
O(CNT) and the electric field strength EFS (C
NT-1) is shifted to EFs (CNT), CNT is set as CNT-1, and the judgment as to whether MN=CNT is repeated again. On the other hand, if MN=CNT, M
EMO= (MN) stores the receiving frequency and E
The received electric field strength is memorized in FS (MN), and the second A
Return to ■ in the diagram. Repeat this process several times and when the reception frequency becomes the same as the start frequency after going around the reception band, check whether it has looped twice or not.
If you have not LOOPed twice in the first time, that is, if you have gone around the reception band for the first time, 5TPCNT will be “6”.
”, and if it is not “6”, the reception sensitivity is increased, that is, it is switched to DX, and the above process is repeated again. On the other hand, if it has already been LOOPed twice, , 5
It is checked whether TPCNT is "0" or not, and if it is "0", the reception sensitivity is switched to DX and the process is ended. That is, in this case, there is no station where the electric field strength is above the predetermined level,
The reception frequency will return to the one before starting auto memory. If this 5TPCNT is not "0", the station having the reception frequency with the maximum reception field strength is called out from the memory 1, the reception sensitivity is switched to DX, and the reception state is set. Also, the S
When T P CN and T are "6", that is, when all 6 preset memory stations are filled with one LOOPL, the memory 1 is called and the reception sensitivity is switched to DX.

The memory state resulting from such auto-memory processing will be described below.

First, in FIG. 3A, in auto memory mode,
When you operate the UP start key or DOWN start key, the reception counter (STPCNT) is cleared.
The electric field strength (EFS (1 to 6)) is also cleared.

However, memory N.

Frequencies A, B, C1D, E, stored in numbers 1 to 6
F is not cleared, and when frequency G is received, the electric field strength of this frequency G is measured, and this electric field strength is “
2'', this is the largest value among the electric field strengths in other memory numbers, so the frequency G is stored in memory number 1 as shown in FIG. 3B, and the reception counter becomes 1.

Next, when frequency H is received, the electric field strength is measured in the same manner as above, and if this electric field strength is "1", it is the second strength, so frequency H is stored in memory NO2 as shown in Figure 3C.
When the reception counter receives the frequency signal, it measures the electric field strength, and if this electric field strength is "3", it is the largest value among the electric field strengths of other memory NOs. Therefore, the frequency frequency is stored in the memory Not as shown in FIG. 3D, and the frequencies G and H are respectively shifted into the memory 2.3. This shift occurs within the range of the reception counter, so the frequency that was previously received,
E and F are not shifted.

Further, the reception counter becomes "3", and such processing is repeated until the reception counter reaches 6'.

Also, during auto memory operation, a timer interrupt is used to constantly check whether any other key is pressed, and if any of the preset keys, UP start key, DOWN start key, auto memory key, etc. is pressed, If the auto memory operation stops and the key pressed at that time is a preset key, the station stored in the memory corresponding to that preset key is called up and enters the receiving state. If a key other than the preset key is pressed, the reception state will be at the frequency at the time the signal stopped.

Incidentally, in order to be able to see how many preset keys have been memorized by the auto memory operation, a display element may be provided corresponding to each preset key, and only the display element corresponding to the memorized preset key may be lit.

〔Effect of the invention〕

As described above, according to the automatic memory system of the receiver according to the present invention, the selected reception frequencies are stored in each memory section in order of strength of the electric field, so it is possible to listen to broadcast stations with good reception conditions. This is especially convenient in areas where a large number of broadcast stations can be received.

Also, if there is a station memorized at the end of the auto memory operation, the receiving frequency is the station with the strongest electric field strength among the memorized stations, and if no station is memorized, the frequency returns to the starting frequency, so the predetermined level If there are stations above the specified level, the station with the strongest electric field strength will be automatically opened, and if there are no stations north of the specified level, you will be able to continue listening to the station you were listening to before starting the auto memory. It's convenient.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an electronically tuned radio receiver implementing the auto-memory method of the receiver according to the present invention, FIGS. 2A and 2B are flowcharts showing the processing of the auto-memory method of the receiver, and FIG. 3A 3D to 3D are diagrams showing memory states in the automatic memory system of the receiver. lO...CPU Figure 3A Figure 3B Figure 3C Figure 3D Q9-

Claims (1)

[Claims] A plurality of preset keys are provided, a memory section corresponding to the preset keys is provided, and the electric field strength of the selected reception frequency is memorized in order of strength by looping the reception frequency, and when the loop operation is completed, if there is a memorized station, An automatic memory system for a receiver, characterized in that the reception frequency is set to the station having the strongest electric field strength among the memorized stations, and when no station is memorized, the frequency returns to the frequency at the start of loop operation.