JP2002158597A - Volume adjuster for receiver with preset function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a volume adjuster for a receiver having a preset function, where a proper volume can automatically be set without rapid changes of the reception output volume of a receiving station, after tuning by a preset tuning function. SOLUTION: In the case of presetting from the broadcasting station of a weak electric field to that of an intense electric field, when it is switched by the preset function, a volume is lowered automatically.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a volume adjusting device for a receiver having a preset function, and more particularly to a volume adjusting device for a receiver having a preset function having a preset tuning function.

[0002]

2. Description of the Related Art A preset channel selecting function that allows a user to select a preset broadcasting station with a single touch has been widely adopted especially in operability in an environment where user operations are restricted such as driving a car. However, it is also used in ordinary radios and the like in such environments.

In a conventional receiver such as a radio having a preset channel selection function, a radio wave received by an antenna is amplified as a high frequency signal, and an intermediate frequency signal obtained by mixing with a frequency signal from a local oscillation circuit is amplified. Then, only the low-frequency component is extracted by a low-pass filter, amplified, and output to a speaker or the like.

[0004] The preset channel selection function is to adjust the reception processing frequency to a desired broadcasting station frequency, and is performed by changing the output frequency from the local oscillator circuit according to the frequency to be selected.

[0005]

By the way, the volume level of the audio signal output from the loudspeaker of the audio signal obtained through the processing system after receiving the radio wave from the broadcasting station selected by the preset channel selection function is changed. Since the sound volume level is optimally set for the station set to, it is not necessarily optimal for the station selected. For example, when listening to a certain station of AM broadcast and switching to another station by the preset channel selection function, the reception state of the station after switching is not optimized, and the radio wave from the station after switching is weak. In the case of an electric field, the sound output from the speaker is low, and the user must increase the volume to set a high volume. Thereafter, when switching to another station with a stronger electric field by the preset channel selection function, since the volume setting is a setting for the receiving station before switching,
The volume output from the loudspeaker is too high, and the volume must be lowered in a hurry.

In view of the above, the present invention provides a volume control of a receiver having a preset function which can automatically set an appropriate volume without a sudden change in the reception output volume of a receiving station after tuning by a preset channel selection function. It is an object to provide an adjusting device.

[0007]

In order to solve the above-mentioned problems, a volume adjusting device for a receiver having a preset function according to the present invention employs the following characteristic configuration.

(1) In a receiver for selecting a reception station by switching a receiving station by a preset function, when a broadcasting station of a weak electric field is preset to a broadcasting station of a strong electric field in response to the switching by the preset function, A volume adjustment device for a receiver having a preset function of lowering the volume for adjusting the output volume.

(2) The volume adjusting device for a receiver having the preset function of (1), wherein the volume is lowered based on a difference in received radio wave intensity before and after switching by the preset function.

(3) In a receiver for selecting a reception station by switching a receiving station by a preset function, when a broadcasting station of a strong electric field is preset to a broadcasting station of a weak electric field in response to the switching by the preset function, A volume adjustment device for a receiver having a preset function of increasing a volume for adjusting an output volume and removing a noise component.

(4) A high-frequency amplifier for amplifying a radio wave signal received via an antenna, a high-frequency signal amplified by the high-frequency amplifier, and a local-frequency signal from a local-frequency circuit for mixing to output an intermediate-frequency signal. Device, an IF amplifier that amplifies the intermediate frequency signal from the mixer, a detection circuit that detects the signal from the IF amplifier, and a low-pass filter that extracts a low-frequency component of the signal detected by the detection circuit, An audio amplifier for amplifying a signal from the low-pass filter and outputting the amplified signal as an audio signal; a preset switch for operating a preset function; and an S for detecting an S-meter level from the detection circuit in response to the operation of the preset switch. Based on information data from the meter level detection circuit and the S-meter level detection circuit. And an electronic volume for adjusting the volume so that the S-meter level before the preset is lower and the volume is increased before the preset only when the volume is increased before the preset. Volume adjustment device for receiver with preset function.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a volume control device for a receiver having a preset function according to the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a block diagram showing an embodiment of a volume adjusting device for a receiver having a preset function according to the present invention.

A radio signal from a broadcasting station received by an antenna 1 is amplified by a high-frequency amplifier 2, and is mixed by a mixer 3 by a local oscillation circuit 4.
And an intermediate frequency signal is obtained. The obtained intermediate frequency signal is amplified by the IF amplifier 5 and detected by the detection circuit 6. From the signal detected by the detection circuit 6, a low-frequency signal is extracted by a low-pass filter (LPF) 7 and amplified by an audio amplifier 8.
Output to an external circuit such as a speaker.

In this embodiment, in response to the operation of the preset switch 12, the S meter level detection circuit 9
Detects the S meter level based on the signal from the detection circuit 6 and sends it to the microcomputer 11. The microcomputer 11
Based on the information data from the meter level detection circuit 9,
Compare the S-meter level before and after the preset, the S-meter level before the preset is lower, and only when the volume was increased before the preset, the electronic volume as a volume adjuster to decrease by the amount of the volume increase only before the preset Adjust 10

In the above description of the embodiment, when presetting from a broadcasting station with a weak electric field to a broadcasting station with a strong electric field, the volume is automatically lowered to eliminate the jarring due to a sudden increase in volume and to reduce the volume. Is unnecessary.

On the other hand, contrary to this embodiment, it is of course possible to automatically increase the volume when a broadcasting station with a strong electric field is preset to a broadcasting station with a weak electric field. In this case, the noise component also rises to the same level, so that a noise removing circuit may be added.

Although the preferred embodiment of the volume adjusting device for a receiver having the preset function of the present invention has been described above, this is merely an example, and various modifications can be made in accordance with a specific application. Of course.

[0018]

As described above, the volume adjusting device for a receiver having the preset function according to the present invention can automatically adjust the volume level when the receiving broadcast station is switched by the preset function. Even when the preset function is operated while the vehicle is running, there is no harshness caused by a sudden increase in the volume, and it is not necessary to perform the adjustment by operating the volume control, so that the convenience and the operability are greatly improved. For example, it is possible to automatically lower the volume when presetting from a broadcasting station with a weak electric field to a broadcasting station with a strong electric field, or to increase the volume automatically when presetting from a broadcasting station with a strong electric field to a broadcasting station with a weak electric field. It becomes possible.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating an embodiment of a volume adjusting device of a receiver having a preset function according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Antenna 2 High frequency amplifier 3 Mixer 4 Local oscillator 5 IF amplifier 6 Detection circuit 7 Low pass filter (LPF) 8 Audio amplifier 9 S meter level detection circuit 10 Electronic volume 11 Microcomputer 12 Preset switch

Claims (4)

[Claims] 1. A receiver for selecting a reception station by switching a receiving station by a preset function, automatically responding to the switching by the preset function when presetting from a weak electric field broadcasting station to a strong electric field broadcasting station. A volume adjusting device for a receiver having a preset function, wherein a volume for adjusting an output volume is lowered. 2. A volume adjusting device for a receiver having a preset function according to claim 1, wherein said volume reduction is set based on a difference in received radio field intensity before and after switching by said preset function. 3. A receiver for selecting a reception station by switching a receiving station by a preset function, automatically responding to the switching by the preset function when presetting from a broadcasting station having a strong electric field to a broadcasting station having a weak electric field. A volume adjusting device for a receiver having a preset function, which increases a volume for adjusting an output volume and removes a noise component. 4. A high-frequency amplifier for amplifying a radio wave signal received via an antenna, a mixer for mixing the high-frequency signal amplified by the high-frequency amplifier and a local signal from a local circuit to output an intermediate frequency signal. An IF amplifier for amplifying an intermediate frequency signal from the mixer; a detection circuit for detecting a signal from the IF amplifier; a low-pass filter for extracting a low-frequency component of the signal detected by the detection circuit; An audio amplifier for amplifying a signal from the low-pass filter and outputting the signal as an audio signal; a preset switch for operating a preset function; and an S-meter for detecting an S-meter level from the detection circuit in response to the operation of the preset switch A level detection circuit, based on information data from the S-meter level detection circuit, before and after presetting. And an electronic volume for adjusting the volume so that the S-meter level before the preset is lower and the volume is increased before the preset only when the volume is increased before the preset. A volume adjusting device for a receiver having a preset function.