JPH03183219A - Radio receiver - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a radio receiver equipped with a plurality of electronic tuners.

[Prior Art] In a radio receiver that selects received signals from broadcasting stations such as AM broadcasting, shortwave broadcasting, and longwave broadcasting, as well as from broadcasting stations such as FM broadcasting and TV broadcasting, AM chisuna, shortwave, etc. connected in parallel to the antenna are used. The tuner is equipped with a tuner, long wave tuner, FM tuner, etc., and when selecting a desired broadcasting station frequency, a control signal is applied to variably control the capacitive impedance of the tuner's tuning circuit so as to tune to this frequency. The reception mode switching device interposed between the receiver and the power supply circuit is configured to switch and scan in one direction, and apply the voltage of the power supply circuit to the tuner to be selected to energize it.

[Problem to be Solved by the Invention BE As described above, the reception mode switching device is configured to switch and scan only in one direction. When attempting to select a tuner located near the opposite direction to the scanning direction, it is necessary to scan the receiving mode switching device almost once, which not only increases the scanning time but also increases the scanning time. , there is a problem that the operation is time-consuming.

The present invention has been made in view of the above-mentioned problems, and its purpose is to provide a new radio receiver that can quickly switch between desired reception modes.

[Means for Solving the Problems] A radio receiver according to the present invention has a plurality of electronic tuners arranged in parallel on an antenna that tune in to received signals from a shortwave to longwave broadcasting station and an extremely shortwave broadcasting station. In a radio receiver equipped with a reception mode switching device for selecting and connecting to a power source, a reception mode switching button for operating the reception mode switching device provided on the receiving panel surface of the radio receiver, and operation of the reception mode switching button. The first time has a value whose time width becomes longer. When comparing the second and third time width reference values and determining that the operating time is longer than the second time width reference value and shorter than the third time width reference value, the direction of movement of the reception mode switching device is determined. While selecting the forward direction,
When determining that the operating time is longer than the third time width reference value,
The direction of movement of the reception mode switching device is selected to be the reverse direction, and when it is determined that the operating time is shorter than the first time width reference value, the reception mode switching device is moved in the selected direction of movement of the reception mode switching device. The invention is characterized in that it includes a control means for controlling the movement in steps.

[Operation] By pressing and operating the receiving mode switching button for a long time with different lengths of time, the moving direction of the receiving mode switching device is selected as forward rotation or reverse direction, and then the receiving mode switching button is pressed for a short period of time. When the pressure is applied, the reception mode switching device is moved in the selected movement direction to select a desired reception mode.

[Embodiment] An embodiment of a radio receiver according to the present invention will be described below with reference to the accompanying drawings.

Fig. 1 shows the front of the radio receiver according to the present invention, and symbol (2) indicates the frequency of the broadcasting station being received and AM, FM, SW (shortwave) at the upper center of the panel surface <1).
(3) is a reception mode switch button located at the lower left side of the panel surface (1) for selecting AM, FM, and SW reception modes, as shown in Figure 3. When the pressure is activated for a long time T2 as shown, the direction of movement of the receiving mode switching device (20) is selected as clockwise in FIG. When the pressure is applied, the moving direction is selected in the counterclockwise direction in FIG. 2, that is, the reverse direction, and the short time T1
When the intermittent pressure is activated, the reception mode switching device is controlled by the microcomputer (23) to advance. Note that codes (4) to (8) refer to FMIFM2. SW, AM
1 is a key for directly selecting the AM2 reception mode, and (9) is a seek (step) up/down key.

FIG. 2 shows a receiving mode switching device (2
0), which shows the receiving circuit block diagram including FMI
A tuner (12) and an FM2 tuner (13) are installed in parallel with the antenna (11), and a SW is installed in the antenna (14).
Tuner (15), AMI tuner (16) and AM2
Tuners (17) are arranged in parallel, and a control signal for controlling impedance so as to be tuned to a desired tuning frequency from a tuning frequency control circuit (24) is input to tuning circuits (not shown) of these tuners. It is configured. The reception mode switching device (20) has fixed contacts SI to S connected to the FMI tuner (12) to AM2 tuner (17), respectively, and a mode switching device that selectively scans these fixed contacts and connects them to the power source B. m8T+, T'2 at the time of pressing operation of the microcomputer (3) consisting of the contact point (21)
．． In order to determine T:l, the first . The second and third time width signals are stored, and the signal input by pressing the reception mode switching button (3) during time T6 shown in FIG. In order to rotate the direction of movement of the receiving mode switching device (20) in the normal direction when determining that the receiving mode switching device (20) is shorter than the reference value,
It is set so that a pulse that advances a movable contact (21), which will be described later, by one step is outputted with positive polarity, and the reception mode switching button (3) is set to T shown in FIG.

When it is determined that the signal input by the pressing operation during the time is longer than the third reference value, the reception mode switching device 71 (2
0), the movable contact (21)
In addition to setting the pulse that advances by l steps to be output with negative polarity, the third
The movable contact (2
1) is controlled to generate a pulse that advances by one step, thereby switching the reception mode switching device to the correct mode via the switch drive circuit (22).

Control is performed so that one of the two opposite directions is selected and the movement is made. In addition, the code (18>) is the FMI tuner (12
) to AM2 tuner (17) are low-frequency amplified and input to the speaker (19).

The operation of the device configured in this way will be explained with reference to the flowchart shown in FIG. 4. As shown in FIG. 2, when the movable contact (21) is connected to the fixed contact S1, the reception mode switching ) is turned on for time T2, step 41>, the direction of movement of the reception switching device (20) is selected in the forward rotation direction (step 42), and then the reception mode switching button (3> is turned on for time T). When turned on (step 43), the movable contact (21) advances one step in the normal rotation movement direction and connects to the fixed contact S5, and the AM2 tuner (17)
) to power supply B. If the desired reception mode cannot be obtained, return to step 44) (step 43) and fix the movable contact (21) by turning on the reception mode switching button (3) again for T time. Connect to contact S4 and connect AMI tuner (16) to power supply B.

Such processing is continued until the desired reception mode is selected.

On the other hand, when the receiving mode switching button (3) is turned on for a time T1 (step 45), the moving direction of the receiving mode switching device (20) is set to the reverse direction (step 46), and then the receiving mode switching button (3) is turned on. is turned on for a time T (step 47), the movable contact (2) connected to the fixed contact sl
1) is moved one step in the reverse direction and connected to the fixed contact S2 to connect the FM2 tuner (13) to the power source B.

If the desired reception mode cannot be obtained (step 48
), return to (step 47) and press the reception mode switch button (
3> for a time T1, the movable contact (21
) to the fixed contact S. Such processing is continued until a desired receiving moto is selected.

The direction of movement of the receiving mode switching device can also be set by pressing the receiving mode switching button once and then twice for a long time. You can also select the reception mode within a certain period of time after pressing the reception mode selection button, or by pressing seek (step), up, down, -V - (9) while pressing the reception mode selection button, and then press the reception mode selection button. The reception mode can be directly selected by pressing any of the reception mode selection keys (4) to (8) while pressing the button or within a certain period of time after pressing the reception mode selection keys (4) to (8).

Furthermore, as the reception mode switching device explained in this embodiment,
Needless to say, it is also possible to configure the system using an electronic switch.

[Effects of the Invention] As described above, according to the present invention, the length of the operating time of the reception mode switching button is determined and the moving direction of the reception mode switching device is selected and set to either forward or reverse, and Since the structure is such that the reception mode switching device is moved in the set movement direction by a short-time operation of the reception mode switching button, the selection operation from the currently set reception mode to the desired reception mode can be performed in the correct manner. This can be done with the shortest number of scans from either of the two reverse directions, making it possible to quickly select the desired reception mode. Since it is possible to do this, there is no need to provide extra buttons in parallel, and it is possible to reduce the cost increase in this aspect.

[Brief explanation of drawings]

FIG. 1 is a panel front view of an embodiment of the radio receiver according to the present invention, FIG. 2 is a circuit block diagram showing the main parts of the radio receiver according to the present invention, and FIG. 3 is a radio receiver according to the present invention. FIG. 4 is a waveform diagram showing the pressing operation time of the reception mode switching button of the radio receiver, and FIG. 4 is a flowchart showing the procedure for selecting the reception mode of the radio receiver according to the present invention. In the drawing, (1): Radio receiver panel, <3): Reception mode switch button, (11), (14): Antenna, (1)
2). (13), (1,5), (16), (17
)・Tuner, (20)・・Reception mode switching device,
(21)・Movable contact, (22)・Switch drive circuit,
(23)...Microcomputer.

Claims (1)

[Claims] A reception mode in which a plurality of electronic tuners tuned to received signals from a shortwave to longwave broadcasting station and an extremely shortwave broadcasting station are arranged in parallel on an antenna, and the electronic tuner is selected and connected to a power source. In a radio receiver equipped with a switching device, a reception mode switching button for activating the reception mode switching device provided on the reception panel surface of the radio receiver, and a value in which the time width of the operation time of the reception mode switching button increases sequentially. the first with
, the reception mode switching device compares with the second and third time width reference values and determines that the operating time is longer than the second time width reference value and shorter than the third time width reference value. When it is determined that the operating time is longer than the third time width reference value, the moving direction of the reception mode switching device is selected to be the reverse direction, and the operating time is set to the reverse direction. A radio receiver comprising: control means for controlling the reception mode switching device to step in the selected movement direction of the reception mode switching device when determining that the duration is shorter than the first reference value; .