JPH11225030A - Portable radio receiver provided with automatic sound volume adjustment function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain optimum sound volume and sound quality at all times by eliminating the effect of noise depending on the operating environmental condition of the portable radio receiver. SOLUTION: In this portable radio receiver, a microphone 12 built in a portable radio receiver body picks up surrounding noise, a filter 16 characterizes the noise, and a sound volume adjustment device 7 and an amplifier adjustment circuit 23 are controlled to provide optimum sound volume and sound quality against the surrounding noise by using a program in a CPU 18 or a program in an external memory 21 so as to obtain an earphone output 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable radio having an automatic volume control function which can be heard at an optimum volume and sound quality depending on ambient environmental conditions.

[0002]

2. Description of the Related Art In recent years, rapid progress has been made in various parts, LSIs, and the like, and a very compact and high-performance portable radio has been realized. When walking with a portable radio, walking outdoors, taking a bus, riding a train, walking in an underpass, or walking with a portable radio, it moves randomly in various conditions.

FIG. 5 is a block diagram showing a configuration example of a conventional portable radio. In this method, the radio wave received by the receiving antenna 1 is amplified by the RF amplifier 2 to obtain an appropriate high-frequency level.
In order to further stably amplify the high-frequency signal, the mixing circuit 3 mixes the high-frequency signal with a local signal from the local oscillator 4 to convert the mixed signal into an intermediate frequency, and the IF amplifier circuit 5 amplifies the signal to a level to be detected. Then, the signal is converted into an audio signal by the detection / amplification circuit 6, the volume is adjusted by the volume controller 7, and the radio broadcast is presented to the user as the earphone output 9 via the output circuit 8. The power supply 10 supplies necessary power to the RF amplifier 2 and the like.

[0004]

However, when a user moves with a portable radio and moves in places such as high noise, low noise, and different acoustic conditions depending on the conditions of a user who carries the portable radio, the user listens to the portable radio. Some users want to adjust the volume with the volume controller 7 according to the surrounding environment conditions, sometimes change the acoustic characteristics, and operate the knob of the volume controller of the portable radio. Because of its small size, it is difficult to touch the knob of the volume control.Fumbling with the portable radio in the pocket, touching the tuning knob, etc. to remove the program being listened to, and making it uncomfortable There was a problem such as there.

FIG. 6 is a noise model diagram showing the relationship between ambient environment conditions (horizontal axis) and sound field level (vertical axis). As a specific example, a portable radio is attached to a body indoors for use when going out, and an earphone is attached to an ear hole to compare with a noise level in the room (by using a bodily sensation instead of a measuring instrument or the like) and adjust to an optimal sound field. When the user goes out of the room, the ambient noise has a different volume level depending on the walking conditions as shown in the volume model diagram of FIG.

In FIG. 6, A: optimum volume of the user (indoor) B: clear sound can be heard (quiet road) C: earphone sound cannot be heard due to ambient noise (noisy road) D: further It is difficult to hear the volume adjusted indoors because the surrounding volume is increased (in a train). This is a state in which the user decides to listen to the radio broadcast without changing the volume determined indoors to a certain amount. In addition, as shown in FIG. 7, manually set A->A1->A2-> A3 to a state close to the initially set ambient noise and earphone volume.
・ ・ The troublesome operation of listening instead of the condition was necessary.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to enable automatic volume and sound quality corresponding to ambient environmental conditions that change with movement of a portable radio.

[0008]

In order to achieve the above object, the present invention has a microphone for detecting ambient noise in a housing of a portable radio, and the CPU controls the portable radio in accordance with the noise level detected by the microphone. This automatically and optimally adjusts the sound volume and sound quality.

According to the present invention, it is possible to comfortably listen to a radio program by automatically changing the volume and the sound quality in accordance with the ambient environmental conditions that change with movement of the portable radio.

A microphone detects ambient environmental conditions in the process of moving while carrying the portable radio, and the sound characteristics of the detected microphone and a built-in CPU which stores the situation in advance are timely determined to determine the volume. -Has the effect of optimizing sound quality.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention has a microphone in a housing of a portable radio, and a CPU which is preset to an optimum volume and sound quality in accordance with ambient environmental conditions encountered by the portable radio. The CPU automatically adjusts the volume and sound quality of the portable radio according to the noise level detected by the microphone.

An embodiment of the present invention will be described below with reference to FIGS.

(Embodiment) FIG. 1 is a schematic diagram of a portable radio according to an embodiment of the present invention. As shown in FIG. 1, the portable radio body 11 incorporates a microphone 12, a CPU 18 (not shown) (see FIG. 2), and the like. Reference numeral 13 denotes a tuning display unit.

FIG. 2 is a block diagram showing a configuration example of the portable radio shown in FIG. 2, reference numeral 14 denotes an amplifier connected to an amplification / adjustment circuit 23, 15 denotes an amplifier that collects and amplifies ambient noise from the microphone 12, 16 denotes a filter that characterizes ambient noise, and 17 denotes an A / D converter. Circuit, 18
Denotes a CPU, 19 and 20 denote D / A conversion circuits, 21 denotes an external memory, and 22 denotes a controller. In addition, the blocks having the same functions as those of the conventional example shown in FIG.

Next, the operation of FIG. 2 will be described with reference to FIGS.

The radio wave received by the receiving antenna 1 is amplified by the RF amplifier 2 to obtain an appropriate high-frequency level. In order to further stably amplify this high frequency signal, the signal is mixed with a local signal from a local oscillator 4 in a mixing circuit 3, converted into an intermediate frequency, and amplified to a level to be detected in an IF amplifier circuit 5. Then, it is converted into an audio signal by the detection / amplification circuit 6. The operation so far is the same as in the conventional example.

Next, in the embodiment of the present invention, ambient environment noise is collected by the microphone 12 and amplified by the amplifier 15. The filter 16 characterizes noise collected by the microphone 12, outputs the noise to the A / D conversion circuit 17, converts the digital signal into a digital signal, and converts the digital signal into a signal that can be processed by the CPU 18. Further, the A / D conversion circuit 17 may have a plurality of slaves in order to properly perform the operation of the CPU 18 and increase the speed.

The CPU 18 stores environmental conditions in advance, or stores various ambient conditions in the external memory 21, and instantaneously determines what environment conditions the sound collected by the microphone 12 has. A digital signal is output to various systems of the audio system to the volume controller 7 and the amplification / adjustment circuit 23 via the D / A conversion circuits 19 and 20 in accordance with the volume and relative sound quality determined in advance by the user as comfortable. Adjust each one.

However, depending on the adjustment method, a digital signal may be directly input and adjusted. The output after the comfortable sound volume and the relative sound quality adjusted by the user in the volume controller 7 or the amplification / adjustment circuit 23 are amplified by the amplifier 14 and output as the earphone output 9.

Here, the noise level of the urban environment is significantly different between indoors, outdoors, inside a train, inside a subway car, etc., so that noise characteristics detected by a microphone, for example, as shown in FIG. Noise levels and characteristics are different between B, C, and D, such as inside a road or train. When the noise characteristic is detected, it is compared with the data written in the external memory 21 and
The frequency characteristic is adjusted according to the noise characteristic as shown in FIG.

In addition, an external memory 21 is prepared for optimally restricting the judgment of the CPU, and the optimum conditions are stored and always compared with the conditions to always provide the user with the optimum conditions.

This is to allow the user to input the environment of the CPU 18 or personal preference, such as setting the degree of environmental change between urban and rural areas, or adjusting the sound volume to be soft or strong.

The CPU 18 has a function that can be controlled by the controller 22 even when selecting a radio station. By doing so, the electronic tuning system can be managed and controlled by the CPU, and the convenience of the portable radio is further improved.

The microphone 12 is programmed by the CPU 18 so as not to be interfered by the sound of the speaker of the portable radio, and to detect the noise level of the surrounding environment condition when the sound volume becomes such as not to be interfered in the broadcast program. Have been.

In a device in which the sound of a speaker does not interfere, such as when the user is operating with earphones or the like in his ear, the microphone 12 always detects the noise level of the ambient environment conditions. CPU 18 is programmed.

If the sound is different from the ambient sound condition due to friction of clothes or the like caused by the user, the CPU is programmed in advance so as not to react to the sound.

After the volume is set, the CPU is programmed to always keep the volume constant unless a volume adjustment operation is performed.

[0028]

As described above, according to the present invention, a microphone for detecting ambient noise and a CPU for outputting an appropriate volume and sound quality to the earphone for the ambient noise are incorporated in the housing of the portable radio. By automatically changing the volume and sound quality of the portable radio in accordance with the environment changed by movement, the user can comfortably listen to the radio program.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a portable radio according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration example of FIG. 1;

Fig. 3 Noise characteristic diagram of urban environment

FIG. 4 is a frequency characteristic diagram corresponding to the noise characteristic of FIG. 3;

FIG. 5 is a block diagram showing a configuration example of a conventional portable radio.

FIG. 6 is a noise model diagram showing a relationship between ambient environment conditions and sound field levels.

FIG. 7 is a volume model diagram of FIG. 6;

[Explanation of symbols]

 9 Earphone output 11 Portable radio body 12 Microphone 13 Tuning display section 16 Filter 17 A / D conversion circuit 18 CPU 19, 20 D / A conversion circuit 21 External memory 22 Controller 23 Amplification / adjustment circuit

Claims (7)

[Claims] 1. An automatic volume control, comprising: a microphone for detecting ambient noise in a housing of a portable radio; and automatically adjusting a volume and a sound quality of the portable radio according to a noise level detected by the microphone. Portable radio with functions. 2. A portable radio having a CPU which is preset to an optimum volume and sound quality in accordance with an ambient environment condition encountered by the portable radio, and automatically adjusts the volume and sound quality of the portable radio according to a noise level detected by the microphone. The portable radio with an automatic volume control function according to claim 1, wherein: 3. The automatic sound volume control according to claim 2, wherein a program for previously setting an optimum sound volume and sound quality in accordance with an ambient environment condition encountered by said portable radio is stored in an external memory and used by a CPU. Portable radio with functions. 4. The CPU according to claim 1, wherein said microphone is configured not to interfere with a sound of a speaker of a portable radio, and to detect a noise level of an ambient environment condition when a sound volume is set so as not to interfere in a broadcast program. The portable radio with automatic volume control function according to claim 1, 2 or 3, wherein 5. An apparatus which does not interfere with the sound of a speaker, such as when the user puts on an earphone or the like in an ear and operates the CPU, so that the noise level of the ambient environment is always detected by the microphone. 5. A portable radio with an automatic volume control function according to claim 1, wherein the program is programmed. 6. The CPU according to claim 1, wherein the CPU is programmed so as not to react to the sound when the sound is different from the surrounding sound condition due to friction of clothes or the like caused by the user. A portable radio with an automatic volume control function as described in 3, 4 or 5. 7. The program according to claim 1, wherein after setting the volume, the CPU is programmed to always keep the volume constant unless a volume adjustment operation is performed.
A portable radio with an automatic volume control function according to 3, 4, 5 or 6.