JPH0771013B2 - Radio receiver - Google Patents

Description

TECHNICAL FIELD The present invention relates to a radio receiver for receiving radio broadcasts.

Conventional technology Conventionally, by operating the operation button, the reception frequency is set to 1
2. Description of the Related Art There is known a radio receiver that changes sequentially step by step or automatically searches for a receivable broadcasting station. First
The figure shows the operation buttons of this type of radio receiver. First
In the figure, 1 is an up button for selecting a broadcast station having a higher reception frequency than the currently received broadcast, and 2 is a down button for selecting a broadcast station having a lower reception frequency than the currently received broadcast. Button. The up button 1 and the down button 2 have two functions. As shown in FIG. 2 (A), the button 1 or 2 is pressed for a predetermined time (t, for example, t = 0.5 seconds).
When it is pressed for a shorter time, it works as a manual tuning button, and each time button 1 or 2 is pressed, the reception frequency is changed to a predetermined frequency (channel separation Δf: FM in Japan, for example.
It can be increased or decreased by 0.1MHz in broadcasting. Also, as shown in FIG. 2 (B), the up button 1
Alternatively, when the down button 2 is pressed for a time longer than the predetermined time (t), the automatic channel selection mode is set, and a receivable broadcasting station having a higher or lower reception frequency than the currently received reception frequency can be automatically selected. FIG. 3 (A) shows the relationship between the reception frequency and the reception level, and the reception level of the reception frequencies f ₁ , f ₃ , and f ₅ is higher than the predetermined level (L) and receivable. Third
In (A), while the current reception frequency is (f ₁ ), the up button 1 shown in FIG. 1 is pressed for a predetermined time (t).
If you press it shorter, the reception frequency becomes (f ₂ ), and each time you press the up button 1 for a short time, the reception frequency becomes (f ₃ ).
(F ₄ ) (f ₅ ) …… Changes. On the other hand, when the current reception frequency is (f ₁ ), if the up button 1 shown in FIG. 1 is pressed longer than the time (t), the automatic channel selection mode is set, and the reception frequency higher than the current reception frequency f ₁ is received. The reception frequency f ₃ of possible broadcasts is automatically set.

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

In FIG. 4, when the up button 1 or the down button 2 is pressed (steps A and B), the flag is set in the up direction and the down direction in step C or D, and muting is performed in step E to set the reception frequency. Avoid noise when changing. Next, in step F, it is determined whether the flag is in the down direction. If the judgment result is No (N), the data set in the PLL in step H is changed and the reception frequency is increased to the current reception frequency by the channel separation Δf (Δf = 0.1 MHz in FM broadcasting in Japan). Change to the desired frequency. If it is determined to be yes (Y) in step F, the reception frequency is decreased by the amount of channel separation (Δf) in step G. Next, in step I, it is determined whether or not the search is in progress (whether or not the search flag indicating that the search is in progress is set). If the determination result is NO, in step L the up button 1 or the down button It is determined whether 2 is turned off. On the other hand, if YES in step I, it is determined in step J whether there is a receivable broadcasting station (that is, whether the reception level is higher than the predetermined level L). When it is determined in step L that the up button 1 or the down button 2 has been turned off, the muting is canceled and the reception state is restored (step M).
To do. On the other hand, if it is determined to be No in step L,
In step N, it is determined whether or not a predetermined time t (for example, 0.5 seconds) has elapsed after the up button 1 or the down button 2 was started to be pressed. If the result is no, the process returns to step L, and if the result is yes, the step O In step P, an alarm sound is generated for a predetermined time (for example, 100 ms), and the process returns to step F. This alarm sound is for notifying the shift from manual tuning to automatic tuning. If it is determined in step J that there is a receivable broadcasting station, step K
In step J, the muting is released and the reception state is restored. If it is determined in step J that there is no receivable station, the process returns to step F.

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

(Manual tuning operation) In FIG. 3 (A), when the up button 1 is pressed for a short time (within 0.5 seconds) while receiving the broadcast of the reception frequency f ₁ , manual tuning is performed. First, the manual tuning operation will be described. When the up button 1 is pressed, the flag is set in the up direction in step C, and step E
Muting takes place at step F and the process moves to step F. Since the flag is set in the up direction in step C,
In step F, it is determined to be “NO”, and in step H, the reception frequency is changed to the frequency f ₂ which is the current reception frequency f ₁ increased by the channel separation (Δf). Next, in step I, it is determined whether or not the search is in progress (whether or not the search flag is set). Since this flag is set in step O, it is determined to be "NO" at the present moment, and the process proceeds to step L. In step L, it is determined whether or not the up button 1 has been turned off. 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, step L Return to. 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 if it is determined that the up button 1 is turned off within 0.5 seconds. , Muting is released, the reception frequency f ₂ set in step H is set, and the manual tuning is completed (step N).

(Automatic tuning operation) In FIG. 3 (A), when the up button 1 is pressed for more than 0.5 seconds in a state where the current reception frequency is f ₁ , the automatic tuning mode is set, and the receivable broadcasting station ( In FIG. ₃ , the broadcast station of the reception frequency f ₃ ) is automatically selected. Next, this automatic channel selection mode will be described with reference to FIG.
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, the process moves to step H via step F, the reception frequency is set to f _2, and the process moves to step L via step I. At this stage, the up button 1 has not been turned off yet, so it is determined to be NO in step L, and the process proceeds to step N. Repeat steps L and N until the up button 1 is turned off, but if it is longer than 0.5 seconds after pressing the up button 1,
In step P, the search flag is set, an alarm sound is generated in step P, and the process returns to step F. In step F, it is determined to be no, and in step H, the current reception frequency f ₂ is increased by the amount of channel separation (Δf) and the reception frequency is changed to f ₃ . Next, in step I, it is judged whether or not the search is in progress.
Since the search flag is set in step 1, the determination in step I is YES, and the process proceeds to step J. In step J, it is judged whether or not the reception level of the reception frequency f ₃ is higher than the predetermined level (L), but as shown in FIG. 3 (A), the reception level at the reception frequency f ₃ is the predetermined level (L). ) Is higher, it is judged as YES in Step J, the process proceeds to Step K, the muting is released,
Broadcasts with reception frequency f ₃ can be received.

As described above, according to the conventional radio receiver, if the up button 1 or the down button 2 is pressed for a short time, the frequency can be manually changed step by step, and
When the button is pressed for a long time, the next receivable broadcasting station can be automatically selected. Particularly, in the above-mentioned conventional example, as is apparent from FIG. 4, there is an advantage that the reception frequency can be instantaneously changed even if the up button 1 or the down button 2 is pressed for a very short time. That is, if the up button 1 or the down button 2 is pressed, regardless of whether or not the button is continuously pressed for a long period of time, first, a process of changing the reception frequency by the channel separation (steps G and H) is performed, and then step L , N, it is possible to shift to the receiving operation earlier than 0.5 seconds if it is judged that the button has been turned off.

However, as shown in FIG. 3 (A), the above-described conventional radio receiver receives a channel separation (Δf) higher (or lower) than the current reception frequency (eg, f ₁ ). There is no problem if there is no frequency broadcasting station (for example, the broadcasting station of frequency f ₂ in FIG. 3A), but as shown in FIG. 3 (B), the channel from the current reception frequency (for example f ₁ ) When there is a broadcasting station with a reception frequency higher (or lower) by the separation (Δf) (for example, a broadcasting station with frequency f ₂ ), there is a problem that this neighboring broadcasting station cannot be automatically selected.

That is, as shown in FIG. 3 (B), frequencies f ₁ , f ₂ ,
In an area where broadcasts of f ₃ and f ₅ can be received, in order to perform automatic channel selection while receiving a broadcast of the reception frequency f _{1 at} present, for example, lengthen the up button 1 (from 0.5 seconds). If pressed for a long time, in the example of FIG. 3 (B), a receivable broadcast (broadcast of reception frequency f ₂ ) must be received by automatic tuning. However, according to the conventional example described above, if the up button 1 is pressed as described above, the process of changing the reception frequency from f ₁ to f ₂ is first performed in step H. But
If it is determined that the button has been pressed for more than 0.5 seconds, the process returns to step F, shifts to automatic channel selection, and passes step H, the reception frequency is changed from f ₂ to f ₃ . As described above, in the above conventional radio receiver, while the broadcast of the frequency f ₁ is being listened to, the channel selection is automatically switched to the broadcast of the frequency f ₂ different by the channel separation (Δf). Even if the button 1 is pressed for more than 0.5 seconds, the broadcast station with the frequency f ₂ cannot be automatically selected, and the next receivable broadcast (broadcast with the reception frequency f ₃ ) is automatically selected.

The present invention solves the above-mentioned conventional problems, and provides a radio receiver capable of automatically selecting a broadcast having a reception frequency different by the channel separation (Δf).

Means for Solving the Problems In order to achieve the above-mentioned object, the present invention has pressed the up button 1 or the down button 2 longer than the time (for example, 0.5 seconds) necessary for shifting to automatic channel selection. When is detected, a means for returning the reception frequency increased or decreased by the channel separation before that to the reception frequency before the button is pressed is added.

Effect The present invention has the above-described configuration, and after the up button or the down button is pressed and the reception frequency is increased or decreased by the amount of channel separation, when the automatic tuning operation is started, the operation is first increased or decreased. The reduced reception frequency is returned to the original reception frequency, and then the reception frequency for the channel separation is sequentially changed to automatically select a channel.

Embodiment An embodiment 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 amplifier circuit, 5 is a mixing circuit, 6 is a local oscillation circuit, 7 is an intermediate amplifier circuit, and 8 is a predetermined reception level. A station presence / absence detection circuit for detecting whether or not the value is larger than a value, 9 is a detection circuit, 10 is a power amplification circuit, and 11 is a speaker. Reference numeral 12 denotes a control circuit including a microcomputer, etc. The control circuit 12 receives an ON / OFF signal from an operation button such as an up button 1 or a down button 2 and a signal from a station presence / absence detection circuit 8. , The local oscillation circuit 6, the muting circuit in the power amplifier circuit 10, and the like. 13 is a PLL that controls the oscillation frequency of the local oscillator circuit 6.
Means, 14 is a memory in which a program or data for manual tuning or automatic tuning is stored, and 15 controls the PLL means 13 and the muting circuit in the power amplifier circuit 10 based on the data read from the memory 14. The control means 16 is a timer for detecting the time after the up button 1 and the down button 2 are pressed. FIG. 6 shows an operation flow of the manual channel selection and the automatic channel selection in the above embodiment.

Next, the operation of the above embodiment will be described. In FIG. 5, it is assumed that predetermined data is set in the PLL means 13 and the broadcast of the reception frequency f ₁ (see FIG. 3B) is currently 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 according to the program stored in the memory 14.

In FIG. 6, when the up button 1 is pressed, the process moves from step A to step C to set the flag in the up direction, and in step E, the muting signal is sent from the control means 15 to the power amplifier circuit 10 to mute. Then step F
It is determined that the flag is set in the up direction in (since the flag is set in the up direction in step C), the process proceeds to step H. In step H, PL
The data set in the L means 13 is read from the memory 14,
This data is set in the PLL means 13, and the reception frequency is changed from f ₁ to f ₂ . Next, in step I, it is determined whether or not the search is being performed (whether or not the search flag is set). At this stage, since step O has not elapsed, the search flag has not been set. Therefore, in step I, it is determined to be "NO" and the process proceeds to step L. Step L
Then, it is determined whether or not the up button 1 is turned off, and in step N, it is determined whether or not 0.5 seconds has elapsed since the up button 1 was pressed. Here, if the up button 1 is turned off before 0.5 seconds elapses after the up button 1 is pressed, the process proceeds from step L to step M, and manual reception is performed. If it is pressed for a long time, the process proceeds from step N to step O, the search flag is set, an alarm is generated in step P, and the process proceeds to step Q. In step Q, the process of returning to the frequency before Δf increase / decrease is performed, but as described above, step H
In step Q, the reception frequency is returned from f ₂ to f ₁ because it is changed from f ₁ to f ₂ . Thereafter, when it is determined in step R that the up button 1 has been turned off, or when it is determined in step S that the up button 1 has been pressed for 0.9 seconds, the process returns to step F. In step F, it is determined to be no, and then in step H, the reception frequency is changed from f ₁ to f ₂ (in step Q, the reception frequency is changed from f ₂ to f ₁ , so the reception frequency is changed in step Q). Changed from f ₁ to f ₂ ). Next, in step I, it is determined whether or not the search is in progress. However, since the search flag has already been set in step O, it is determined to be YES in step I, and the process proceeds to the next step J. In step J, it is determined whether or not the reception level of the reception frequency f ₂ is higher than the predetermined level (L). In the case of the present example, as shown in FIG. 3 (B), the reception level at the reception frequency f ₂ is higher than the level (L), so YES is determined in step J, and the reception frequency f by automatic tuning is determined in step K. ₂ is received. Although the above description is for the case where the up button 1 is pressed, the same applies when the down button 2 is pressed.

As described above, according to the above-described embodiment, in the automatic channel selection mode that 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 (Δf) from the current reception frequency. Can be automatically selected.

EFFECTS OF THE INVENTION The present invention has a simple configuration as described above, and has an advantage of being able to automatically select a station having a frequency different from the current reception frequency by the amount of channel separation in the automatic tuning mode.

[Brief description of drawings]

FIG. 1 is a diagram showing an operation button of a radio receiver, FIG. 2 is an operation explanatory diagram of the operation button, FIGS. 3 (A) and (B) are diagrams showing a relationship between a reception frequency and a reception level, and FIG. FIG. 5 is an operation flow chart of the conventional radio receiver, FIG. 5 is a block diagram of the radio receiver in one embodiment of the present invention, and FIG. 6 is an operation flow chart of the radio receiver. 1 ... Up button, 2 ... Down button, 3 ... Antenna, 4 ... High frequency amplification circuit, 5 ... Mixing circuit, 6 ... Local oscillation circuit, 7 ... Intermediate amplification circuit, 8 ... Station Presence / absence detection circuit, 9 ... Detection circuit, 10 ... Power amplification circuit, 11 ... Speaker, 12 ... Control circuit, 13 ... PLL means, 14 ... Memory, 15 ... Control means, 16 ... Timer.

Claims (1)

[Claims] 1. 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, and a timer for measuring the time when the operation button is pressed. Means and the timer means receives the frequency changed by the reception frequency changing means when it is detected that the operation button is pressed for less than a predetermined time, and the timer means operates the operation button for a predetermined time or longer. Control means for changing to the automatic tuning mode when it is detected that the button has been pressed for a long time, and reception before changing the reception frequency changed by the reception frequency changing means when the control means shifts to the automatic tuning mode. A radio receiver consisting of means for returning to the frequency.