JPH0282728A - Radio receiver - Google Patents

Abstract

PURPOSE:To automatically select a station different by channel separation ( F) for an active receiving frequency by using an automatic station selecting mode changed by depressing a button for increasing or a button for decreasing the frequency for a long time. CONSTITUTION:The title receiver is composed of a button 1 for, increasing the frequency a button 2 for decreasing the frequency, an antenna 3, a high frequency amplifying circuit 4, a mixing circuit 5, a local oscillating circuit 6, an intermediate amplifying circuit 7, a station presence/absence detecting circuit 8, a detecting circuit 9, a power amplifying circuit 10, a speaker 11 and a control circuit 12. After the button 1 for up or the button 2 for down is depressed and the receiving frequency f-increased or decreased. In the case of shifting to an automatic station selecting action, first, the increased or reduced receiving frequency is returned to an original receiving frequency and thereafter, the f receiving frequency is successively changed and an automatic station selection is executed. Thus, the station having a different f frequency for the active receiving frequency can be automatically selected.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a radio receiver for receiving radio broadcasts.

Conventional technology Conventionally, by operating the operation button, the reception frequency can be changed to 1.
There are known radio receivers that sequentially change broadcast stations step by step or automatically search for receivable broadcast stations. 1st
The figure shows the operation buttons of this type of radio receiver. 1st
In the figure, l is the up button for selecting a broadcasting station with a higher reception frequency than the broadcast currently being received, and 2 is a down button for selecting a broadcasting station with a lower reception frequency than the broadcasting currently being received. It is a service button. The up button 1 and the down button 2 have two functions, and as shown in FIG. When pressed for a short time, it functions as a manual tuning button, and each time button 1 or 2 is pressed, the receiving frequency can be increased or decreased by a predetermined frequency (channel separation Δf: for example, 0.1 MHz for FM broadcasting in Japan). can. Furthermore, as shown in Fig. 2 (B), if the above-mentioned up button 1 or down button 2 is pressed for a longer time than the predetermined time (1), the automatic channel selection mode will be activated, and the current receiving frequency A higher or lower receivable broadcasting station can be automatically selected. FIG. 3(A) shows the relationship between reception frequency and reception level, and shows reception frequencies f1, f3,
The reception level of f5 is higher than the predetermined level (L) and reception is possible. In FIG. 3(A), when the current reception frequency is (fl), if the up button 1 shown in FIG.
2), and each time you press up button 1 for a short time, the receiving frequency changes to (f3) (f4) (f5)...
...changes. On the other hand, the current receiving frequency is (fl)
In this state, if you press the up button 1 shown in Figure 1 for longer than time (1), the automatic channel selection mode will be activated, and the reception frequency f of receivable broadcasts higher than the current reception frequency f1 will be selected.
3 is automatically set.

FIG. 4 shows the operational flow of manual tuning and automatic tuning of a conventional radio receiver controlled by a microcomputer.

In FIG. 4, when button 1 for up or button 2 for down is pressed (steps A, B), the flag is set in the up direction or down direction in step C or D, muting is performed in step E, and the received frequency is Avoid making noise when making changes. Next, in step F, it is determined whether the flag is in the down direction. If the determination result is NO (N), change the data set in the PLL in step H and change the reception frequency to the current reception frequency with channel separation Δf(
In FM broadcasting in Japan, the frequency is increased by Δf=0°1 MHz). Please note that if you select YES (Y) at step F,
), in step G the reception frequency is changed to
Decrease channel separation (Δf). Next, in step I, it is determined whether or not the search is in progress (whether the search flag indicating that the search is in progress is set), and if the determination result is NO, step and press the UP button 1 or the DOWN button. 2 is turned off or not. On the other hand, if the determination in step (2) is YES, it is determined in step J whether there is a receivable broadcast station (that is, whether the reception level is higher than the predetermined level L). When it is determined that up button 1 or down button 2 is turned off, muting is canceled and the reception state is returned (
Step M). On the other hand, if the step is determined to be NO, it is determined in step N whether a predetermined time t (for example, 0.5 seconds) has elapsed since the up button 1 or the down button 2 started being pressed; If YES, the process returns to step L, and if YES, a search flag indicating that a search is in progress is set in step 0, an alarm sound is generated for a predetermined period of time (for example, 100n+s) in step P, and the process returns to step F. This alarm sound is for notifying the transition from manual channel selection to automatic channel selection.

If it is determined in step J that there is a receivable broadcast station, muting is canceled in step J and the reception state is returned to, and if it is determined in step J that there is no receivable station, , return to step F.

Next, the manual tuning operation and automatic tuning operation of the conventional radio receiver will be explained with reference to FIG. 4.

(Manual channel selection operation) In Fig. 3 (A), the reception frequency f! Press up button 1 for a short time (within 0°5 seconds) while receiving the broadcast.
If you press it, it will be manual channel selection. First, this manual channel selection operation will be explained.

When the up button 1 is pressed, the flag is set in the up direction in step C, muting is applied in step E, and the process moves to step F. Since the flag is set in the upward direction in step C, it is determined as NO in step F, and in step H, the reception frequency is changed to frequency f2, which is the current reception frequency f1 increased by the amount of channel separation (Δf). Next, in step I, it is determined whether a search is in progress (whether a search flag is set).

Since this flag is set in step 0, it is determined as NO at this point, and the process proceeds to step L. In step L, it is determined whether or not the up button 1 has been turned off, and if it is determined to be NO, it is determined in step N whether or not a predetermined time (0.5 seconds) has elapsed, and if it is determined to be NO. Return to step L. That is, in steps L and N, it is determined whether or not the up button 1 is turned off within 0.5 seconds after the up button 1 is pressed, and it is determined that the up button 1 is turned off within 0.5 seconds. If it is determined, muting is canceled, the receiving frequency f2 set in step H is set, and manual tuning ends (step N).

(Automatic channel selection operation) In Fig. 3 (A), when the current reception frequency is fl, if you press button 1 for up for more than 0.5 seconds, the automatic channel selection mode will be activated. (Broadcasting station with receiving frequency f3 in FIG. 3) is automatically selected. Next, this automatic channel selection mode will be explained with reference to FIG. 4. In FIG. 4, when the up button 1 is pressed (step A), the flag is set in the up direction in step C, muting is applied in step E, and step F
The process proceeds to step H, sets the receiving frequency to f2, and then proceeds to step L via step I.

At this stage, the up button 1 has not been turned off yet, so step L is determined as NO, and the process moves to step N. Steps L and N are repeated until button 1 for up is turned off, but if it takes longer than 0.5 seconds after button 1 for up is pressed, the process moves to step P and a search flag is set.
Furthermore, an alarm sound is generated in step P, and the process returns to step F. In step F, it is determined as NO, and in step H, the current reception frequency f2 is added by the channel separation (Δ
f) Increase and change the receiving frequency to fs. Next, in step I, it is determined whether or not a search is in progress, but at this stage, since the search flag has already been set in step 0,
In step I, the determination is YES, and the process moves to step J. In step J, it is determined whether the reception level of reception frequency f3 is higher than a predetermined level (L).
As shown in A), since the reception level at reception frequency f3 is higher than the predetermined level (L), the determination in step J is YES, the process moves to step K, muting is canceled, and the broadcast at reception frequency f3 is received. can.

As described above, according to the above-mentioned conventional radio receiver, by pressing up/down button 1 or down button 2 for a short time, it is possible to manually change the frequency in one step at a time. If you press the time button, you can automatically tune to the next receivable station. In particular, the above-mentioned conventional example has the advantage that the reception frequency can be changed instantaneously even if the up button 1 or the down button 2 is pressed for a very short time, as is clear from FIG. That is, if you press button 1 for up or button 2 for down, then the button is held down (regardless of whether you keep pressing it or not, the process of changing the reception frequency by the channel separation amount (steps G, H) is performed first, and then the step If it is determined that the above button is turned off with L and N, 0.
5 seconds or earlier (it is possible to shift to reception operation).

Problems to be Solved by the Invention However, the above-mentioned conventional radio receiver has problems as shown in FIG.
), the channel separation factor (Δf) is higher (or lower) than the current reception frequency (for example, fl).
There is no problem if there is no broadcasting station of the receiving frequency (for example, the broadcasting station of frequency f2 in Figure 3A), but as shown in Figure 3(B)
As shown in , if there is a broadcasting station with a reception frequency that is higher (or lower) by channel separation (Δf) than the current reception frequency (for example, fl) (for example, a broadcasting station with frequency f2), this neighboring broadcasting station is automatically selected. There was a problem with not being able to select a channel.

That is, as shown in FIG. 3(B), the frequencies fI, f
2. In areas where fs and fs broadcasts can be received,
Currently, in order to perform automatic channel selection while receiving broadcasting on reception frequency f1, for example, press up button 1 for a long time < (0
, if you press () for more than 5 seconds, in the example in Figure 3 (B), automatic tuning will automatically select the receivable broadcasts (receiving frequency f2).
broadcast) must be received by automatic tuning. However, according to the above conventional example, when the up button 1 is pressed as described above, the reception frequency is first changed from fI to f2 in step H, and therefore in step N
If it is determined that the up button 1 has been pressed for longer than 0.5 seconds and the process returns to step F and moves to automatic tuning and passes step H, the receiving frequency will be changed from f2 to f3. be.

In this way, in the conventional radio receiver described above, in order to switch to the broadcast on the frequency f2, which is different by the amount of channel separation (Δf) by automatic tuning, when the broadcast on the frequency f1 is currently being listened to, the up button 1 is pressed. Even if you press the button for more than 0.5 seconds, the broadcasting station with frequency f2 cannot be automatically tuned, and the next receivable broadcast (broadcast with reception frequency f3) will be automatically tuned.

The present invention solves the above-mentioned conventional problems and provides a radio receiver that can automatically tune into broadcasts of reception frequencies that differ by channel separation (Δf).

Means for Solving the Problems In order to achieve the above-mentioned object, the present invention provides a method for pressing the up button 1 or the down button 2 for a longer time (for example, 0.5 seconds) than the time required to shift to automatic channel selection. The present invention is characterized in that, when it is detected that the button has been pressed, a means is added for returning the reception frequency that was previously increased or decreased by the channel separation amount to the reception frequency before the button was pressed.

Operation The present invention has the above-described configuration, and when the reception frequency is increased or decreased by the channel separation amount by pressing the up button or the down button and then shifts to the automatic channel selection operation, the increase or decrease is first performed. The reduced reception frequency is returned to the original reception frequency, and then the reception frequency is sequentially changed by the amount of channel separation for automatic tuning.

EXAMPLE An example of the present invention will be described below with reference to FIG. In FIG. 5, 1 is an up button, 2 is a down button, 3 is an antenna, 4 is a high frequency amplification circuit, 5 is a mixing circuit,
6 is a local oscillation circuit; 7 is an intermediate amplifier circuit; 8 is a patency non-detection circuit that detects whether the reception level is higher than a predetermined value;
9 is a detection circuit, 10 is a power amplification circuit, and 11 is a speaker. 12 is a control circuit consisting of a microcomputer, etc., and this control circuit 12 receives ON/OFF signals from operation buttons such as the up button 1 or the down button 2, and signals from the patency non-detection circuit 8. It controls the local oscillation circuit 6, the muting circuit in the power amplifier circuit 10, etc. 13 is a PLL means for controlling the oscillation frequency of the local oscillation circuit 6; 14 is a memory in which a program or data for manual tuning or automatic tuning is stored; 15;
16 is a control means for controlling the PLL means 13 and the muting circuit in the power amplifier circuit 10 based on data read from the memory 14; 16 is an up button 1 and a down button 2
This is a timer to detect the time since the button was pressed. FIG. 6 shows the operational flow of manual channel selection and automatic channel selection in the above embodiment.

Next, the operation of the above embodiment will be explained. In FIG. 5, it is assumed that predetermined data is set in the PLL means 13 and that a broadcast at the reception frequency fl (see FIG. 3B) is currently being received. Here, when the up button 1 is pressed to change the reception frequency, the control means 15 performs the processing shown in FIG. 6 in accordance with the program stored in the memory 14.

In FIG. 6, when the up button 1 is pressed.

Moving from step A to step C, the flag is set in the up direction, and in step E, a muting signal is sent from the control means 15 to the power amplification circuit 10 to mute it. Next, in step F, it is determined that the flag is set in the up direction (because the flag was set in the up direction in step C), and the process moves to step H. In step H, the flag is set in the PLL means 13. data is stored in memory 1
4, this data is set in the PLL means 13, and the receiving frequency is changed from f+ to f2.

Next, in step (2), it is determined whether a search is in progress (whether a search flag is set or not). At this stage, since step O has not been passed, the search flag is not set. Therefore, it is determined that step (2) is NO, and the process proceeds to step (L). In step L, it is determined whether or not the up button 1 has been turned off, and in step N, it is determined whether 0.5 seconds have elapsed since the up button 1 was pressed. Here, if the up button 1 is turned off before 0.5 seconds have elapsed since the up button 1 was pressed, the process advances from step L to step M, and manual reception is performed.
If the up button 1 is pressed for longer than 0.5 seconds, the process advances from step N to step O, a search flag is set, an alarm is generated in step P, and the process proceeds to step Q. In step Q, processing is performed to return to the frequency before the increase/decrease of Δf, but as described above, since fl has been changed to f2 in step H, the receiving frequency is returned from f2 to f+ in step Q. After that, in step R, it is determined that the up button 1 has been turned off, or in step S
When it is determined that 0.9 seconds have elapsed since the button 1 for up was pressed, the process returns to step F. In step F, it is determined as NO, and in step H, the receiving frequency is changed from fl to f2 (since the receiving frequency has been changed from f2 to fl in step Q, in step Q, the receiving frequency is changed from f+ to f
2). Next, in step I, it is determined whether or not a search is in progress, but since the search flag has already been set in step 0, the determination in step I is YES, and the process proceeds to the next step J. In step J, it is determined whether the reception level of reception frequency f2 is higher than a predetermined level (L). In this example, as shown in FIG. 3(B), the reception level at the reception frequency f2 is higher than the level (L), so the determination in step J is YES, and in step J, the reception level at the reception frequency f2 is determined by automatic tuning. Reception is performed.

The above explanation is for the case where the up button 1 is pressed, but the same applies when the down button 2 is pressed.

As described above, according to the above embodiment, in the automatic tuning mode which is changed by pressing the up button 1 or the down button 2 for a long time, a station that differs by the channel separation amount (Δf) from the current reception frequency is selected. It is possible to automatically select stations.

Effects of the Invention The present invention has a simple configuration as described above, and has the advantage of being able to automatically select a station whose frequency differs from the current receiving frequency by the amount of channel separation in the automatic tuning mode.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the operation buttons of the radio receiver, Fig. 2 is an explanatory diagram of the operation of the same operation buttons, Figs. 3 (A) and (B) are diagrams showing the relationship between reception frequency and reception level, and Fig. 4 The figure shows the operation flow a of a conventional radio receiver, FIG. 5, FIG. 1, and FIG. 1... Button for up, 2... Button for down, 3... Antenna, 4... High frequency amplification circuit, 5... Mixing circuit,
6... Local oscillation circuit, 7... Intermediate amplifier circuit, 8...
- Local oscillation circuit, 9... Detection circuit, 10... Power amplification circuit, 11... Speaker, 12... Control circuit,
13...PLL means, 14...memory, 15...
Control means, 16... Name of timer agent: Patent attorney Shigetaka Awano 1 person T. Figure 3 1111 - Horse t, comparison l h fs □shoulder I trap huan figure figure figure?

Claims (1)

[Claims] An operation button for changing the reception frequency, a reception frequency changing means for changing the reception frequency by a predetermined value when the operation button is pressed, a timer means for measuring the time that the operation button is pressed, and the timer. When the means detects that the operation button has been pressed for a shorter time than a predetermined time, the frequency changed by the reception frequency changing means is received, and the timer means detects that the operation button has been pressed for a longer time than a predetermined time. control means for changing to the automatic tuning mode when detecting the above, and means for returning the reception frequency changed by the reception frequency changing means to the reception frequency before the change when the control means shifts to the automatic tuning mode. A radio receiver consisting of.