JPH01144718A - Auto-memory system for receiver - Google Patents

Abstract

PURPOSE:To call a broadcast station with all preset keys by rearranging a receiving frequency to be selected according to the order of strong electric field intensity and holding a frequency before an auto-memory start to the remained preset key when the receiving frequency to be auto-memorized is small. CONSTITUTION:When a frequency H is received, the electric field intensity is measured. When this electric field intensity is '1', since it is secondly strong one, the frequency H is received to a memory NO2 and a receiving counter goes to be 2. Next, when a frequency I is received, the electric field intensity is measured. Then, when this electric field intensity is '3', since this is the maximum value out of the electric field intensity of the other memory NO, frequencies G and H are respectively shifted in memories NO 2 and 3. Since this shift is executed in the range of the receiving counter, frequencies D-F received in advance are not shifted and the receiving counter goes to be '3'. Such a processing is repeated until the receiving counter goes to be '6'. Thus, the broadcast station can be called by all the preset keys.

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 automatic memory method of conventional car radio receivers is such that when the O) memory mode setting key is pressed to activate the auto memory 'JR', it will change the frequency from the lowest frequency of the receiving band to the highest frequency, or vice versa. OWN
The signals are stored in each memory section in the order of reception frequencies selected at t. During this memory operation, the frequencies stored first in the memory section are erased and are stored in each memory section in the order in which they were received.For example, the frequencies stored in the memory section first are stored in the order of reception. They will be stored sequentially.

Then, when the frequency is increased or decreased once, the frequency is tuned to the frequency in the memory section that was first stored during the automatic memory operation, for example.

(Problem to be Solved by the Invention) By the way, in the auto-memory system of the conventional car radio receiver described above, the received frequencies selected by increasing or decreasing the frequency are sequentially stored in the memory section. Therefore, if the number of reception frequency broadcast stations having a predetermined level or higher is smaller than the number of memory sections (preset keys), the memory sections in which the reception frequencies are not stored remain erased.

Therefore, in this case, the memory section (preset key)
There was a problem that it became impossible to utilize the information effectively.

Therefore, the present invention was made in view of the problems of the related art and to solve this problem.It is possible to memorize frequencies in the order of the reception sensitivity, and to store new information in a memory section that has not been newly memorized by automatic memory. aims to provide an auto-memory method for a receiver in which the frequencies stored in memory before starting auto-memory are retained.

Means for Solving Problem C] In order to achieve this object, 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 a memory section corresponding to each preset key. The received frequencies selected at a predetermined level or higher are stored in the memory section in order of strength of the electric field, and if the number of stations at a predetermined level or higher is less than the number of preset keys, the memory section corresponding to the remaining preset keys is returned to its original state. It is characterized by maintaining the frequency.

[Effect]

, Since it is configured as described above, the selected reception frequencies are sorted in order of strength of electric field, and if there are few reception frequencies to be automatically memorized, the remaining preset keys (memory part) are automatically stored. The frequency before the start of memory will be retained.

〔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 broadcast radio waves coming from an antenna is amplified by a front end 1. 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.

A display 11 displays information such as reception frequency on an LCD based on various signals processed by the 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 for NO, 1 to N0.6 are N in the memory.
001 to No. 0.6, and the memory method of the present invention memorizes the received frequencies from N051 to No. 6 in descending order of electric field strength, and by operating each preset key, each memorized frequency can be recalled. and enters the receiving state.

This CPU10 performs automatic memory type processing as shown in FIGS. 2A and 2B. That is, when the UP start key or the DOWN start key is operated while the auto memory mode is set using the auto memory key, the reception counter (STPCNT ) is set to “O”, all previously memorized electric field strengths (EFS (1 to 6)) are set to “0”.
' and attenuates the input signal level of front end 1 to reduce reception sensitivity, that is, LOC.
Set the reception sensitivity to AL.0 Next, increase or decrease the reception frequency by 1 step, determine whether the reception frequency that has been increased or decreased by 1 step is the same as the start frequency, and if it is not the same, It is determined whether there is a broadcasting station on the reception frequency, and if there is no broadcasting station, the reception frequency is increased or decreased by one step again.

In addition, the UP (DOWN) of the receiving frequency is /(When it reaches the highest (lowest) frequency in the band, it goes to the lowest (highest) frequency -
I can go back and continue.

On the other hand, if there is a broadcasting station on the reception frequency, measure its electric field strength (EFS (x)), and then
MN) is set to "1", and the electric field strength (EFS (MN)) is determined 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 > 6, the reception frequency is increased or decreased by one step again, and if EFS (MN) > EFS (x), 1 is added to the value of 5TPCNT. 5TPCN
Check whether T>6. If 5TPCNT>6, there are only 6 preset memories, so 5TPCNT
CNT is set to 6 and the value of 5TPCNT is input to the counter (CNT), and even if 5TPCNT>6, the 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 M in order to shift the memory contents.
EMo (CNT) and the electric field strength E
Shift FS (CNT-1) to EFS (CNT),
The determination as to whether MN=CNT can be repeated again by setting CNT to CNT-1. On the other hand, if MN=CNT, the reception frequency is stored in MEMO (MN) and the reception electric field strength is stored in EFS (MN), and the process returns to (2) in FIG. 2A. 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. In the case, i.e.
When it first goes around the receiving band, it is determined whether 5TPCNT is "6" or not, and if it is not 6'°, the receiving sensitivity is changed to DX, and the above process is repeated again. The name is changed. On the other hand, if it has already been LOOPed twice, check whether 5TPCNT is °O'° and set tiO
If it is ++, the reception sensitivity is switched to DX and the process ends. That is, in this case, there is no station whose electric field strength is equal to or higher than the predetermined level, and the reception frequency returns to the one before the start of auto-memory. If this 5TPCNT is not "°0"', the station of the 48 receiving frequencies with the maximum receiving field strength is retrieved from the memory 1, the receiving sensitivity is switched to DX, and the receiving state is set. In addition, if the 5TPCNT is °゛6'', press and LOOP once and when all 6 preset memory stations are filled, memory 1 is called and the reception sensitivity is set to D.
Switch to X.

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

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. When frequency G is received, the electric field strength of this frequency G is measured, and this electric field strength is “
2", it is the largest value among the electric field strengths in other memory numbers, so the frequency G is stored in memory No. 1 as shown in FIG. 3B, and the reception counter is 1.
becomes. Next, when frequency aH is received, the electric field strength is measured in the same way as above, and if this electric field strength is ° "l",
Since it is the second strength, frequency H is stored in memory NO2 as shown in Fig. 3C, and the reception counter becomes 2.0 Next, when frequency aI is received, the electric field strength is measured, and this electric field strength is In the case of °3'°, it is the largest value among the electric field strengths of other memories NO, so frequency I is stored in memory Not as shown in FIG. 3D, and frequencies G and H are respectively stored in memory 2. , 3. Since this shift is performed within the range of the reception counter, the previously received frequencies E and F are not shifted.

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

Also, during auto memory operation, a timer interrupt is used to constantly check whether or not other keys are pressed.
If any of the UP start key, DOWN start key, auto memory key, etc. is pressed, the auto memory operation will stop, and if the key pressed at that time is a preset key, the memory corresponding to that preset key will be saved. The stored station is called and becomes ready for reception. If a key other than the preset key is pressed, the reception state will be at the frequency at the time the signal stopped.

In addition, so that you can see how many preset keys have been memorized by the auto memory operation, a display element corresponding to each preset key is provided to display the memory.

Alternatively, only the display element corresponding to the preset key that has been turned on may be lit.

〔Effect of the invention〕

”: As described above, according to the automatic memory method of the receiver according to the present invention, the reception frequencies selected in each memory section are stored in order of strength of the electric field, and the reception frequencies that are automatically memorized at a predetermined level or higher are Even if there are few frequencies, it is possible to call up some broadcasting station using any Grise-2 key, which is especially convenient in areas where only a few broadcasting stations can be received.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an electronically tuned radio receiver implementing the receiver auto-memory method according to the present invention, FIGS. 2A and 2B are flowcharts showing the process of the receiver auto-memory method, and FIG. 3A 3D to 3D are diagrams showing memory states in the automatic memory system of the receiver. 10...CPU No. 28 [Fig. 3D]

Claims (1)

[Claims] A plurality of preset keys are provided, a memory section corresponding to the preset keys is provided, and reception frequencies selected at a predetermined level or higher are stored in each memory section in order of strength of electric field, and stations with a predetermined level or higher are stored in the preset key number. The automatic memory system of the receiver is characterized in that if the frequency is not reached, the memory section corresponding to the remaining preset keys retains the frequency in the original state.