JP2005223445A - Volume controller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To automatically adjust the sound to a volume level in conformity with the user's preference corresponding to a noise level. <P>SOLUTION: The volume controller is provided with a noise level detecting circuit 20 for detecting the ambient noise level N; a non-volatile memory 12 which stores a volume correction value R corresponding to the noise level N of the volume level V to be outputted from a speaker 18 as a volume correction table; and a CPU 10 which reads out the volume correction value R corresponding to the noise level N detected with the noise level detecting circuit 20, corrects an initial volume level of the speaker 18 on the basis of the volume correction value R, rewrites the volume correction value R corresponding to the noise level N to a new volume correction value R in accordance with the changed volume level after change, and stores it in an RAM 11 when the corrected volume level after correction is changed by a volume level change operation by the user. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a volume control device, and is suitable for application to a volume control device mounted on, for example, a car audio device.

  2. Description of the Related Art Conventionally, in a car audio apparatus, an audio signal generated by radio reception, CD (Compact Disc) playback, or the like is amplified to a volume level designated by a built-in amplifier and output as sound from a speaker.

  By the way, in the interior space of an automobile, the noise level changes variously according to the difference in engine volume between normal road driving and highway driving, the change in surrounding traffic, and the like.

  At this time, in order for the car audio device to allow the user to listen to radio or CD sound without being buried in noise, it is necessary for the user to adjust the volume level every time the noise level changes. Will be forced to operate.

Therefore, some car audio devices have been proposed that detect a noise level using a microphone or the like and automatically adjust the volume level according to the noise level (for example, Patent Document 1). reference).
Japanese Patent Laid-Open No. 5-30588 (page 3, FIG. 1)

  However, even if the car audio device having such a configuration automatically adjusts the volume level according to the detected noise level, the adjusted volume level is adjusted to a predetermined volume level with respect to the noise level. Does not necessarily match user preferences.

  For this reason, the car audio apparatus has a problem that the user is required to re-adjust the volume level when the automatically adjusted volume level does not match the user's preference.

  The present invention has been made in consideration of the above points, and an object of the present invention is to propose a volume adjusting device that can automatically correct the volume level according to the user's preference according to the noise level.

  In order to solve such a problem, in the volume control device of the present invention, a noise level detection means for detecting the ambient noise level and a correction value corresponding to the noise level of the volume level to be output from the audio output means as a correction value group. A stored correction value storage means; an initial volume level correction means for reading a correction value corresponding to the noise level detected by the noise level detection means; and correcting an initial volume level of the audio output means based on the correction value; After the initial volume level is corrected by the initial volume level correcting means, when the corrected volume level after the correction is changed by the user's volume level changing operation, the correction value corresponding to the noise level is changed to the changed volume level after the change. At the same time, a new correction value is rewritten and a correction value rewriting means for storing in the temporary storage area is provided.

  As a result, the correction value can be automatically rewritten according to the changed volume level changed by the user. Therefore, when the initial volume level is corrected next time, the user can use the rewritten new correction value. It can be corrected to a new corrected volume level that suits the user's preference.

  In the volume adjustment method of the present invention, a noise level detection step for detecting the ambient noise level, and a volume level correction value to be output from the audio output means corresponding to the noise level detected in the noise level detection step are read. The initial volume level correction step for correcting the initial volume level of the audio output means based on the correction value, and the initial volume level is corrected by the initial volume level correction step, and then the corrected volume level is changed by the user's volume level change operation. When the correction volume level is changed, the correction value corresponding to the noise level is rewritten to a new correction value according to the changed volume level after the change, and a correction value rewriting step for storing in the temporary storage area is provided. .

  As a result, the correction value can be automatically rewritten according to the changed volume level changed by the user. Therefore, when the initial volume level is corrected next time, the user can use the rewritten new correction value. It can be corrected to a new corrected volume level that suits the user's preference.

  Furthermore, in the volume adjustment program of the present invention, a noise level detection step for detecting the ambient noise level, and a volume level correction value to be output from the audio output means corresponding to the noise level detected in the noise level detection step are read. The initial volume level correction step for correcting the initial volume level of the audio output means based on the correction value, and the initial volume level is corrected by the initial volume level correction step, and then the corrected volume level is changed by the user's volume level change operation. When the correction volume level is changed, the correction value corresponding to the noise level is rewritten to a new correction value according to the changed volume level after the change, and a correction value rewriting step for storing in the temporary storage area is provided. .

  As a result, the correction value can be automatically rewritten according to the changed volume level changed by the user. Therefore, when the initial volume level is corrected next time, the user can use the rewritten new correction value. It can be corrected to a new corrected volume level that suits the user's preference.

  According to the present invention, the correction value can be automatically rewritten according to the changed sound volume level changed by the user. Therefore, when the initial sound volume level is corrected next time, the rewritten new correction value is used. Thus, it is possible to realize a volume adjustment device that can correct to a new corrected volume level that suits the user's preference, and can automatically adjust the volume level to the user's preference according to the noise level.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

(1) Configuration of Car Audio Device In FIG. 1, reference numeral 1 denotes the overall configuration of a car audio device according to an embodiment of the present invention, which is based on a command from a user sitting in a driver seat or a passenger seat in a car. Radio broadcast reception and CD (Compact Disc) playback, and the audio signal is amplified to the volume desired by the user, and the radio broadcast or CD sound (hereinafter referred to as audio sound) is sent to the user. It is made to listen.

  The car audio device 1 is configured to centrally control the car audio device 1 by a CPU (Central Processing Unit) 10, and a basic program such as an OS (Operational System) read from a ROM (Read Only Memory) (not shown) Various application programs such as a volume adjustment program are developed in the RAM 11 and executed to perform various processes.

  The car audio apparatus 1 inputs an audio signal S1 from a CD playback unit (not shown) to a preamplifier 15 via an input terminal 14.

  Incidentally, the car audio apparatus 1 may input an audio signal or the like from a radio receiving unit (not shown) to the preamplifier 15 in addition to the audio signal S1.

  The preamplifier 15 generates an audio signal S2 for the input audio signal S1 by adjusting a different volume level for each sound source such as radio or CD, and sends it to the electronic volume 16.

  The electronic volume 16 changes the setting based on the volume level instruction command G from the CPU 10, thereby converting the audio signal S2 supplied from the preamplifier 15 into an audio signal S3, which is converted into a power amplifier 17 and a noise level detection circuit. 20 to send.

  The power amplifier 17 generates an audio signal S4 by amplifying the audio signal S3 transmitted from the electronic volume 16 with a predetermined amplification factor, and outputs the audio signal S4 to the speaker 18 to output audio audio from the speaker 18. .

  In addition, when the user presses the volume up button 13A or the volume down button 13B for changing the volume, the operation unit 13 displays the volume level V indicating the volume in response to the interface (I / F) 13C. To the CPU 10 via

  At this time, the CPU 10 sends a volume level instruction command G corresponding to the volume level V to the electronic volume 16 to cause the electronic volume 16 to generate an audio signal S3 having a magnitude corresponding to the volume level V, and as a result. The audio sound having a volume corresponding to the volume level V is output from the speaker 18.

  As described above, the car audio device 1 amplifies the audio signal S1 to a volume corresponding to the volume level V and allows the user to listen to the audio sound.

  In addition to such a configuration, the car audio device 1 is configured to adjust the volume by the volume adjusting unit 2 in order to output the optimum audio sound corresponding to the noise level N in the vehicle interior space, and the noise level N in the vehicle interior space. The sound signal S5 in the interior space collected through the microphone 19 built in the car audio device 1 main body is input to the noise level detection circuit 20 of the sound volume adjustment unit 2.

  Here, since the microphone 19 collects all sound in the vehicle interior space, in addition to the noise that should be collected, the microphone 19 also collects the audio sound that is output from the speaker 18 and should not be collected as noise.

  Therefore, the noise level detection circuit 20 detects only the noise level N of the noise to be collected by subtracting the voice signal S3 corresponding to the audio voice from all the collected voice and the voice signal S5 corresponding to the noise. The noise level N is sent to the CPU 10.

  The CPU 10 of the volume adjusting unit 2 corrects the volume level V according to the noise level N as described below.

(2) Volume Level Correction By the way, the volume adjustment unit 2 of the car audio device 1 recognizes the volume level V when the car audio device 1 is turned on as the initial volume level, and then responds to the noise level N. The initial sound volume level is corrected to a corrected sound volume level using a correction value (hereinafter referred to as a sound volume correction value R), thereby allowing the user to listen to the audio sound without being buried in noise.

  The volume adjustment unit 2 stores the volume correction value R for the noise level N detected by the noise level detection circuit 20 in the nonvolatile memory 12 as four types of volume correction tables T (T1 to T4) according to the initial volume level. If each of the volume correction tables T1 to T4 is graphically represented, it can be expressed as a volume correction curve shown in FIG.

  In practice, the volume adjusting unit 2 recognizes the initial volume level (volume levels V1, V2, V3, and V4) when the car audio device 1 is turned on, and selects the volume correction table T based on the initial volume level. The selected volume correction table T is read from the nonvolatile memory 12 and stored in the RAM 11.

  Then, the volume adjustment unit 2 detects the noise level N by the noise level detection circuit 20, and corrects the initial volume level to the corrected volume level by using the volume correction value R corresponding to the noise level N. Yes.

  Here, as shown in FIG. 2, the sound volume adjustment unit 2 does not correct the initial sound volume level when the noise level N is lower than the noise level N1, but the noise level N ranges from the noise level N1 to the noise level N5. When the interval is between, the respective volume correction curves are overlapped, so that the initial volume level is corrected to the corrected volume level using the same volume correction value R for the noise level N regardless of the initial volume level.

  In addition, when the noise level N is greater than the noise level N5, the volume adjustment unit 2 has different volume correction curves, so that even if the noise level N is the same, the volume adjustment unit 2 is in accordance with the initial volume level. The initial volume level is corrected to the corrected volume level using a different volume correction value R.

  As described above, the volume adjustment unit 2 can use a different volume correction value R depending on the initial volume level even if the noise level N is the same, so that an appropriate correction volume level corresponding to the initial volume level can be used. Can be corrected.

  Here, the relationship between the noise level N and the volume level V when the volume adjusting unit 2 actually corrects the initial volume level to the corrected volume level is different depending on the initial volume level as shown in FIG. -It can be expressed as a volume characteristic curve Q (Q1 to Q4). Note that the noise-volume characteristic curves Q1 to Q4 correspond to the volume correction tables T1 to T4 (FIG. 2), respectively.

  That is, when the initial volume level is relatively small, for example, the volume level V1, the volume adjusting unit 2 uniformly adjusts the volume of the corrected volume level in proportion to the increase in the noise level N as shown in the noise-volume characteristic curve Q1. The level V is increased, so that the user can listen to the audio sound without being buried in noise.

  Further, when the initial volume level is relatively high, for example, the volume level V4, the volume adjustment unit 2 adjusts the noise level N to a certain level of the noise level N5 as shown in the noise-volume characteristic curve Q4. Although the volume level V of the corrected volume level is increased uniformly in response, the ratio of increasing the volume level V of the corrected volume level with respect to the noise level N when the noise level N becomes higher than the noise level N5. It is made to reduce (that is, to make the inclination gentle).

  At this time, since the initial volume level (volume level V4) is relatively large, the volume adjustment unit 2 makes the volume level V greater than the maximum volume level Vmax, which is the maximum value, when the noise level N is greater than the noise level N5. Although it cannot be performed, even if the volume level V of the correction volume level is not increased so much with respect to the noise level N, the audio sound can be heard by the user with a sufficiently large volume with respect to the surrounding noise.

  As described above, the volume adjustment unit 2 selects the volume correction table T based on the initial volume level, and uses the volume correction value R corresponding to the level of the noise level N based on the volume correction table T to set the initial volume. The level is corrected to the corrected volume level.

  Note that the volume adjusting unit 2 is configured to correct the volume level V as described above, so that the initial volume level is always corrected using the optimal volume correction value R for the noise level N that changes from time to time. The volume level can be corrected.

  As a result, the car audio device 1 can always correct the volume according to the noise level at that time, so that the user does not have to adjust the volume directly, and without being buried in the noise that changes at any time. The user can listen to the audio sound.

(3) Rewriting the Volume Correction Table By the way, the volume adjustment unit 2 changes the volume level V by the user pressing the volume up button 13A or the volume down button 13B even though the initial volume level is corrected to the corrected volume level. Then, the volume correction table T in the RAM 11 is rewritten accordingly, and thereafter the initial volume level is corrected using the rewritten new volume correction table T.

  When the initial volume level at the time when the power is turned on is, for example, the volume level V3, the CPU 10 of the volume adjustment unit 2 selects the volume correction table T3 corresponding to this (FIG. 2), and the selected volume correction table. T3 is read from the nonvolatile memory 12 and stored in the RAM 11.

  For example, when the CPU 10 acquires the noise level N5 from the noise level detection circuit 20, the CPU 10 obtains a volume correction value R5 (FIG. 2) corresponding to the noise level N5, and sets the volume level V3 that is the initial volume level to the volume correction value R5. The volume is increased by a minute and corrected to a volume level V5 (FIG. 3) which is a corrected volume level.

  However, since the corrected sound volume level (sound volume level V5) for the noise level N5 is set in advance regardless of the user's preference, the corrected sound volume level may not necessarily match the user's preference.

  Here, the car audio device 1 is changed from the corrected volume level (volume level V5) to the changed volume level (volume level V5A) that is smaller by the difference ΔV by the user pressing the volume down button 13B, for example, as shown in FIG. There is a case.

  This means that the corrected volume level preferred by the user with respect to the noise level N5 is not the volume level V5 but the volume level V5A.

  At this time, the CPU 10 should correct the initial volume level (volume level V3) to the updated volume level (volume level V5A) when the noise level is N5 due to the change from the volume level V5 to the volume level V5A by the user. That is, the noise-volume characteristic curve Q3 is an imaginary straight line (shown by a wavy line) passing through the point P1 (noise level N1, volume level V3) and point P5A (noise level N5, volume level V5A) on the two-dimensional coordinate plane of FIG. Judge that it should be like this.

  Therefore, the CPU 10 stores the volume correction value R at the noise level N5 in the RAM 11 so that the volume correction value R5A is smaller than the volume correction value R5 by the difference ΔV as shown in the volume correction curve in FIG. The sound volume correction table T3 is rewritten to the sound volume correction table T3A.

  Thereby, the CPU 10 can correct the initial volume level (volume level V3) to a new corrected volume level (volume level V5A) without causing the user to perform any operation when the noise level N5 is detected next time. , It can be adapted to the user's preference.

  Since the CPU 10 does not update the volume correction table T stored in the nonvolatile memory 12 when rewriting the volume correction table T stored in the RAM 11, the volume of the car audio device 1 is turned on every time the car audio device 1 is turned on. The correction table T can be read again. For example, when the driver of a car is changed, the current driver is rewritten by rewriting the volume correction table T stored in the RAM 11 without being affected by the previous driver's preference. Can be adapted to your taste.

(4) Volume Adjustment Processing Procedure Next, a series of processes when rewriting the volume correction table T after correcting the initial volume level to the corrected volume level will be described in detail with reference to the flowchart shown in FIG. When the car audio device 1 is powered on, the CPU 10 of the volume adjustment unit 2 enters from the start step of the volume adjustment processing procedure RT1 and proceeds to step SP1.

  In step SP1, the CPU 10 recognizes, for example, the volume level V3 when the car audio device 1 is turned on as the initial volume level, and proceeds to the next step SP2.

  In step SP2, the CPU 10 selects and stores the volume correction table T3 in the RAM 11 based on the volume level V3 that is the initial volume level, and proceeds to the next step SP3.

  In step SP3, the CPU 10 determines whether noise is detected by the noise level detection circuit 20 at this time. If a negative result is obtained here, this means that it is not necessary to correct the initial volume level because no noise is detected. At this time, the CPU 10 repeats this step SP3 until noise is detected. And wait.

  On the other hand, if an affirmative result is obtained in step SP3, this indicates that noise is detected, and therefore the initial volume level needs to be corrected to the corrected volume level according to the noise level N. At this time, The CPU 10 moves to the next step SP4.

  In step SP4, the CPU 10 acquires the noise level N5 at this time from the noise level detection circuit 20, and proceeds to the next step SP5.

  In step SP5, the CPU 10 acquires the volume correction value R5 corresponding to the noise level N5 at this time using the volume correction table T3 stored in the RAM 11, and proceeds to the next step SP6.

  In step SP6, the CPU 10 corrects the volume level V3, which is the initial volume level, to the corrected volume level (volume level V5) using the volume correction value R5, and proceeds to the next step SP7.

  In step SP7, the CPU 10 determines whether or not the corrected volume level has been changed to the changed volume level by a user operation after correcting the initial volume level to the corrected volume level (volume level V5).

  If a negative result is obtained here, this means that the corrected volume level (volume level V5) has not been changed by the user, so that the user has the corrected volume level (volume level V5) with respect to the noise level N5 at this time. At this time, the CPU 10 keeps the volume correction table T3 stored in the RAM 11, and returns to step SP3 again to repeat a series of processes.

  On the other hand, if an affirmative result is obtained in step SP7, this is changed from the corrected volume level (volume level V5) to the changed volume level (volume level V5A) by the user's operation, so that the user changes to the noise level N5 at this time. On the other hand, this indicates that the changed volume level (volume level V5A) is considered appropriate instead of the corrected volume level (volume level V5). At this time, the CPU 10 rewrites the volume correction table T3 in order to Control goes to step SP8.

  In step SP8, the CPU 10 rewrites the volume correction table T3 stored in the RAM 11 to the volume correction table T3A (FIG. 5) based on the changed volume level (volume level V5A), and then returns to step SP3 again to perform a series of processing. repeat.

  Thereafter, the CPU 10 repeats the processing of step SP3 to step SP8 until the power of the car audio device 1 is turned off, and ends the volume adjustment processing procedure RT1 when the power of the car audio device 1 is turned off.

(5) Operation and Effect In the above configuration, the volume adjustment unit 2 selects the volume correction table T based on the initial volume level at the time when the car audio device 1 is turned on, and reads it from the nonvolatile memory 12 When noise is detected after the volume correction table T is stored in the RAM 11, the volume correction value R (FIG. 2) corresponding to the noise level N at this time is acquired using the volume correction table T. The initial volume level is corrected to the corrected volume level using the volume correction value R (FIG. 3).

  Then, when the corrected volume level is changed to the changed volume level by the user's operation (FIG. 4), the volume adjusting unit 2 is stored in the RAM 11 so as to correct the noise level N at this time to the changed volume level. The volume correction table T is rewritten (FIG. 5).

  Therefore, the volume adjustment unit 2 automatically renews the next time the same noise level N is detected by rewriting the volume correction table T based on the changed volume level when the noise level N is detected. The volume level can be corrected to match the user's preference.

  At this time, when the volume adjustment unit 2 rewrites the volume correction table, for example, when the noise level is N5, the corrected volume level is changed to the changed volume level, and the volume correction value R5 is rewritten to a new volume correction value R5A. Furthermore, since the volume correction value R6 when the noise level N6 close to the noise level N5 is detected is also rewritten to a new volume correction value R6A (FIG. 5), even when the noise level N6 is detected for the first time, There is a high possibility that the initial sound volume level is corrected to the new corrected sound volume level by the new sound volume correction value R6A so as to match the user's preference.

  Further, the volume adjustment unit 2 can rewrite the volume correction table T so as to match the user's preference simply by changing from the corrected volume level to the changed volume level by the user's operation. There is no need to bother rewriting the volume correction table T, and the corrected volume level based on the rewritten new volume correction table T immediately after the user changes from the corrected volume level to the changed volume level. Can be adjusted to the user's preference immediately.

  Further, the volume adjustment unit 2 automatically selects the volume correction table T based on the initial volume level from among the four different volume correction tables T, thereby causing the user to select the volume correction table T. There is no need to make it happen.

  In addition, the volume adjustment unit 2 can rewrite each volume correction table T according to the user's preference, so that the initial volume level can be finely adapted to the user's preference according to the initial volume level and the noise level N. Can be corrected to a corrected volume level.

  According to the above configuration, the volume adjusting unit 2 corrects the initial volume level to the corrected volume level according to the noise level N using the volume correction table, and then changes from the corrected volume level to the changed volume level. Since the volume correction table T is rewritten according to the changed volume level, it can be corrected to a new corrected volume level that suits the user's preference, and thus according to the user's preference according to the noise level. The volume level can be adjusted automatically.

(6) Other Embodiments In the above-described embodiment, the case where the volume correction table T is rewritten every time the volume is manually adjusted by the user has been described. However, the present invention is not limited to this. For example, the volume correction table T is not rewritten until the car audio device 1 is turned off, and the changed volume level changed by the user is stored in the nonvolatile memory 12 and the next time the power is turned on. Alternatively, the volume correction table T may be rewritten at another timing, such as calculating a virtual straight line on the two-dimensional coordinate plane (FIG. 4) using only the latest changed volume level.

  In the above-described embodiment, the volume correction table T is rewritten so that the noise-volume characteristic Q is a virtual straight line passing through the points P1 and P5A on the two-dimensional coordinate plane shown in FIG. However, the present invention is not limited to this. For example, the least square method is applied to the two-dimensional coordinate plane shown in FIG. 4 based on the past three history of the changed volume level changed by the user. The volume correction table T may be rewritten using another method such as calculating a virtual straight line.

  Furthermore, in the above-described embodiment, the case where the volume correction curve is configured by a combination of two straight lines in FIG. 2 has been described. However, the present invention is not limited to this, and the volume correction curve may be one or three. You may comprise by the straight line more than this, or it may comprise using a part of parabola etc., or you may make it combine these suitably.

  Furthermore, in the above-described embodiment, the case where the relationship between the noise level N and the volume correction value R is stored in the nonvolatile memory 12 in the form of the volume correction table T as a correction value group has been described. The invention is not limited to this, and the relationship between the noise level N and the sound volume correction value R may be stored using a quadratic function, for example.

  In this case, the coefficient of each term of the quadratic function is stored in the non-volatile memory 12, and when the user changes from the corrected volume level to the changed volume level, the quadratic function is calculated based on a predetermined calculation process. The coefficient of each term may be rewritten, and further, the function itself may be stored in the nonvolatile memory 12, and the function itself may be rewritten.

  Further, in the above-described embodiment, the case where the volume correction table stored in the nonvolatile memory 12 is not updated when the volume correction table T stored in the RAM 11 is rewritten has been described. However, the present invention is not limited to this, and the volume correction table T stored in the nonvolatile memory 12 may be updated when the volume correction table T stored in the RAM 11 is rewritten. The volume correction table T according to the user's preference can be stored even if the power is disconnected, and the initial volume level can be corrected to the corrected volume level according to the user's preference simply by turning on the power. it can.

  Furthermore, in the above-described embodiment, the case where four types of different volume correction tables T are stored in the nonvolatile memory 12 has been described. However, the present invention is not limited to this, and an arbitrary number of different volume correction tables T. The table T may be stored.

  Further, in the above-described embodiment, the case where the initial volume level when the car audio apparatus 1 is turned on is unconditionally corrected to the corrected volume level is described, but the present invention is not limited to this. For example, the operation unit 13 is provided with a “volume correction” button, and when the user presses the “volume correction” button, the correction of the volume level is started or ended, and the “volume correction” button is pressed. The current volume level V may be regarded as the initial volume level.

  In this case, the car audio device 1 can change the volume level V and then press the “volume correction” button to arbitrarily specify the initial volume level, and correct the initial volume level to the corrected volume level. As a result, the user's preference can be matched better.

  Further, in the above-described embodiment, the case where the microphone 19 is provided inside the car audio device 1 has been described. However, the present invention is not limited to this, and the microphone 19 is located near the position of the user's ear in the vehicle interior space. Thus, the car audio apparatus 1 can acquire a noise level N that is very close to the noise level N that is actually heard by the user's ear, and as a result, the user's preference. It is possible to correct to a corrected volume level that is more consistent.

  Furthermore, in the above-described embodiment, the case where the present invention is applied to the volume adjustment unit 2 of the car audio device 1 has been described. However, the present invention is not limited to this, and is used outdoors such as a headphone stereo or a mobile phone. It may be applied to an electronic device that can be used. In this case, by detecting the ambient noise level, for example, an audio voice, a telephone call, etc. against a temporary large noise when a large vehicle passes outdoors. The volume level of the voice or the ringing tone can be automatically corrected, and the user can listen to the voice without being buried in the noise without bothering the user to operate the volume.

  The present invention may also be applied to indoor electronic devices such as television receivers and telephones. In this case, for example, when a vacuum cleaner is used by detecting the noise level in the indoor space. The volume level of TV voices, telephone ringing sounds, etc. can be automatically corrected for temporary loud noises, so that the user does not bother to manipulate the volume and squeeze without being buried in noise. Can be heard.

  Furthermore, in the above-described embodiment, the sound volume is detected by the noise level detection circuit 20 as the noise level detection means, the nonvolatile memory 12 as the correction value storage means, and the CPU 10 as the initial sound volume level correction means and the correction value rewriting means. Although the case where the volume adjusting unit 2 as the adjusting device is configured has been described, the present invention is not limited to this, but a noise level detecting unit, a correction value storing unit, an initial volume level correcting unit having various other circuit configurations, The sound volume adjusting device may be configured by the correction value rewriting means.

  Furthermore, in the above-described embodiment, the case where the volume adjustment unit 2 as the information processing apparatus is caused to execute the volume adjustment program has been described. However, the present invention is not limited to this, and other various information processing apparatuses can be used. A volume adjustment program may be executed.

  The present invention can also be used in various electronic devices such as a headphone stereo and a mobile phone.

1 is a schematic block diagram illustrating a configuration of a car audio device according to an embodiment of the present invention. It is a basic diagram which shows a volume correction curve. It is a basic diagram which shows a noise-volume characteristic. It is a basic diagram with which it uses for description of a noise-volume characteristic update. It is a basic diagram with which it uses for description of rewriting of a volume correction table. It is a flowchart which shows a volume adjustment processing procedure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Car audio apparatus, 2 ... Volume control part, 10 ... CPU, 11 ... RAM, 12 ... Nonvolatile memory, 20 ... Noise level detection circuit.

Claims (5)

Noise level detection means for detecting ambient noise level;
Correction value storage means for storing a correction value corresponding to the noise level of the volume level to be output from the sound output means as a correction value group;
Initial volume level correction means for reading the correction value corresponding to the noise level detected by the noise level detection means, and correcting the initial volume level of the sound output means based on the correction value;
After the initial volume level is corrected by the initial volume level correcting means, when the corrected volume level after the correction is changed by the user's volume level changing operation, the correction value corresponding to the noise level is changed after the change. A volume adjustment device comprising: correction value rewriting means for rewriting to a new correction value in accordance with a volume level and storing the correction value in a temporary storage area. The correction value rewriting means is
The sound volume according to claim 1, wherein after the new correction value is stored in the temporary storage area, the correction value stored in the correction value storage means is updated with the new correction value. Adjustment device. The correction value storage means stores a plurality of correction value groups for each initial volume level,
The initial volume level correcting means detects an initial volume level of the audio output means, reads a correction value group corresponding to the detected initial volume level, and corrects the initial volume level based on the correction value group. The volume control device according to claim 1. A noise level detection step for detecting the ambient noise level;
An initial volume level correction for reading a volume level correction value to be output from the audio output unit corresponding to the noise level detected in the noise level detection step, and correcting the initial volume level of the audio output unit based on the correction value Steps,
After the initial volume level is corrected by the initial volume level correction step, when the corrected volume level after correction is changed by a user volume level change operation, the correction value corresponding to the noise level is changed after the change. A volume adjustment method comprising: a correction value rewriting step for rewriting to a new correction value according to a volume level and storing the correction value in a temporary storage area. In the information processing device,
A noise level detection step for detecting the ambient noise level;
An initial volume level correction for reading a volume level correction value to be output from the audio output means corresponding to the noise level detected in the noise level detection step, and correcting the initial volume level of the audio output means based on the correction value Steps,
After the initial volume level is corrected by the initial volume level correction step, when the corrected volume level after correction is changed by a user volume level change operation, the correction value corresponding to the noise level is changed after the change. A volume adjustment program that rewrites a new correction value in accordance with a volume level and executes a correction value rewriting step that is stored in a temporary storage area.

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