WO2006027881A1 - オーディオ装置 - Google Patents
オーディオ装置 Download PDFInfo
- Publication number
- WO2006027881A1 WO2006027881A1 PCT/JP2005/010969 JP2005010969W WO2006027881A1 WO 2006027881 A1 WO2006027881 A1 WO 2006027881A1 JP 2005010969 W JP2005010969 W JP 2005010969W WO 2006027881 A1 WO2006027881 A1 WO 2006027881A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- gain
- audio
- internal
- acoustic
- source
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
- H03G3/001—Digital control of analog signals
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
- H03G3/02—Manually-operated control
Definitions
- the present invention relates to an audio apparatus that selectively outputs a plurality of acoustic source power sounds, and more particularly to an audio apparatus that can smoothly adjust a volume when changing the selection of an acoustic source.
- a user obtains a desired volume from a speaker. Therefore, a volume adjustment is performed every time an acoustic source is selected. There is a need to do. In other words, as a result of the volume level differing depending on the acoustic source, the user must adjust the volume each time the acoustic source is selected, and volume adjustment is often bothersome.
- the set volume level stored in the volume level storage circuit is compared with the volume level of the audio signal detected by the volume level detection circuit.
- the volume control circuit is controlled based on these differences.
- the user uses the volume control unit to adjust the volume level of a receiving device such as a television or radio or an audio device such as a CD.
- the volume level is stored in the volume level storage circuit, and if the volume level of the audio signal detected by the volume level detection circuit is different from the set volume level, the volume adjustment circuit is controlled to always set the volume level. ! /, And so on (for example, see Patent Document 1).
- the signal level detection means detects the signal level of the input signal and obtains this signal level in order to obtain an appropriate speaker output without the user resetting the volume. Comparing the signal level stored in the storage means and detected by the signal level detection means with the read signal level so that the speaker output before and after switching of the sound source becomes substantially equal according to the comparison result.
- the gain of the variable gain means is controlled (see, for example, Patent Document 2).
- Patent Document 1 Japanese Patent Laid-Open No. 6-37563 (pages 3 to 5, FIGS. 1 to 7)
- Patent Document 2 Japanese Patent Laid-Open No. 2003-348682 (pages 3 to 4, FIGS. 1 to 2)
- the conventional audio apparatus is configured as described above. Therefore, the set volume level is stored in advance, and the volume level detected by the volume level detection circuit is sequentially compared with the set volume level. Therefore, if the load on the control system increases, the user who uses force will have to set a preset volume level in advance.
- the problem is that there are many acoustic sources and the setting is extremely troublesome.
- the signal level detected by the signal level detection means is compared with the signal level read by the storage means, and the speaker output before and after the switching of the sound source is determined according to the comparison result.
- the gain of the variable gain means is controlled so as to be substantially the same, it is still necessary to compare the signal level detected by the sequential signal level detection means with the signal level read out by the storage means power. Therefore, there was a problem when the load on the control system increased.
- the present invention has been made to solve the above-described problems, and includes a plurality of sound sources, and when reproducing sound selectively from a plurality of sound sources, the volume of sound is extremely easy for the user.
- An object is to obtain an audio device capable of performing adjustment.
- the audio device corresponds to a plurality of acoustic sources that output different acoustic signals, a gain adjusting unit that adjusts and outputs the gain of the acoustic signals output from the acoustic sources, and the acoustic source Storage means for storing the gain to be set in the gain adjustment means as an internal gain, and selection means for selecting one of the acoustic sources.
- the gain setting means corresponds to the acoustic source selected by the selection means.
- the internal gain is read out from the memory means and set in the gain adjusting means.
- the gain set in the gain adjusting unit in association with the acoustic source is stored as an internal gain, and when the acoustic source is selected by the selecting unit, the selected acoustic source is stored. Since the internal gain corresponding to the source is set in the gain adjusting means, if the acoustic source is selected by the selecting means, the gain is automatically adjusted to match the acoustic source. Easy volume adjustment (gain adjustment) There is an effect.
- FIG. 1 is a block diagram showing an example of an audio apparatus according to Embodiment 1 of the present invention.
- FIG. 2 is a flowchart for explaining the operation of the audio apparatus according to the first embodiment of the present invention.
- FIG. 3 is a block diagram for explaining the operation of the CPU shown in FIG. 1.
- FIG. 4 is a diagram showing functional blocks of a CPU in an audio apparatus according to Embodiment 2 of the present invention.
- FIG. 5 is a flowchart for explaining the operation of the audio apparatus according to the second embodiment of the present invention.
- FIG. 1 is a block diagram showing an example of an audio apparatus according to Embodiment 1 of the present invention, and the illustrated audio apparatus 10 is mounted on a vehicle, for example.
- the audio device 10 includes an audio set unit 11, and the audio set unit 11 includes a plurality of sound sources (audio sources) 12 a to 12 c and a speaker 13.
- the audio source 12a is a radio receiver
- the audio source 12b is a CD player
- the audio source 12c is a cassette tape player.
- These audio sources 12a to 12c are connected to an audio processing unit 15 through an analog switch unit (SW) 14, and as will be described later, the audio processing unit 15 receives an input signal (audio signal) input through the SW 14. Signal) is processed and output as a processed signal.
- the processed signal is amplified by a power amplifier (power amplifier) 16 and output from the speaker 13 as sound.
- the audio processing unit 15 includes an AZD converter 15a, a decimation filter 15b, a DC filter 15c, a coefficient unit (gain variable unit: gain adjusting means) 15d, a signal processing unit 15e, and a DZA converter 15f. , Level detector (level detection means) 15g, CPU15h, And a non-volatile memory (storage means) 15i, and SW14 selectively connects one of the audio sources 12a to 12c and the A / D converter 15a according to the operation of the switch switching unit 17 (with SW14).
- the switch switching unit 17 functions as a selection means).
- the AZD converter 15a converts the audio signal supplied via SW14 into a digital signal, and unnecessary data is thinned out from the digital signal by the decimation filter 15b, and the DC offset in the A / D converter 15a is removed by the DC filter 15c. It is.
- the signal processing unit 15e receives, for example, processing such as volume 'tone control' loudness, and the DZA converter 15f Is converted into an analog sound signal and output.
- the output of the factor 15d is fed to the level detector 15g, where the volume level is measured. And this volume level is given to CPU15h.
- the CPU 15h obtains coefficients to be set in the coefficient unit 15d according to the volume level for each audio source, and stores these coefficients as setting coefficients in the nonvolatile memory 15i. Responsively, the coefficient unit 15d is controlled.
- the above-described audio processing unit 15 is configured by, for example, a DSP (Digital Signal Processor).
- the gain specified by A / D converter 15a, decimation filter 15b, DC filter 15c, and coefficient multiplier 15d is defined as internal gain Gab (a and b are numbers greater than or equal to 0).
- This internal gain Gab varies depending on the audio source.
- the gain defined by the signal processing unit 15e, the DZA converter 15f, and the power amplifier 16 is called a fixed gain Gfix, and this fixed gain Gfix does not vary depending on the audio source.
- the gain in the audio set unit 11, that is, (total gain) in the audio device 10 is Gab X Gfix, and this total gain is defined in advance for each audio source.
- the audio sources 12a to 12c that are actually incorporated in the audio set unit 11 inevitably have individual differences, so that an output standard defined in advance for each audio source 12a to 12c.
- the actual output value (output level) of the audio sources 12a to 12c is often different (that is, there is a variation) o If there is such a variation, the user used the audio device 10 Audio If a desired volume level is not obtained from the speaker 13 every time the source 12a to 12c, a situation occurs.
- the coefficient set in the coefficient unit 15d for each audio source is stored in the nonvolatile memory 15i in consideration of the variation for each audio source.
- the output reference values (reference levels) at the time of reproduction of the reference sine wave signals of the audio sources 12a to 12c are X10, X20, and X30, respectively.
- the internal gains for the reference levels X10, X20, and X30 are G10, G20, and G30, respectively.
- the output level (desired output level) from the coefficient unit 15d is YO, ⁇ ⁇ ⁇ , And q'YO (p and q are real numbers greater than or equal to zero).
- These internal gains G10, G20, and G30 and desired output levels ⁇ , ⁇ ⁇ ⁇ , and q'YO are set in advance in the nonvolatile memory 15i, for example (step ST1).
- the audio processing unit 15 and the audio source are switched by SW14.
- the audio signal is input to the audio processing unit 15 from the audio source 12a.
- the switch switching unit 17 gives an audio selection signal indicating that the audio source 12a has been selected to the CPU 15h.
- the output signal of the coefficient unit 15d is supplied to the level detector 15g, and the output level is detected here. Assume that the output level is Y1 (step ST2).
- the CPU 15h knows that the audio source 12a is selected by the audio selection signal, accesses the nonvolatile memory 15i, reads the internal gain G10 corresponding to the audio source 12a and the desired output level YO, and outputs the output level Y1. Determine the coefficient (internal gain) G1 for setting to the desired output level YO.
- the audio processing unit 15 and the audio source 12b are connected by SW14, and the audio signal is input to the audio processing unit 15 as well. Is done. At this time, an audio selection signal indicating that the audio source 12b has been selected is given from the switch switching unit 17 to the CPU 15h.
- the output level detected by the level detector 15g is Y2 (step ST4).
- the audio processing unit 15 and the audio source 12c are connected by the SW 14, and an audio signal is input from the audio source 12c to the audio processing unit 15.
- an audio selection signal indicating that the audio source 12c has been selected is given from the switch switching unit 17 to the CPU 15h.
- the output level detected by the level detector 15g is Y3 (step ST6).
- the CPU 15h obtains internal gains G1 to G3 corresponding to the audio sources 12a to 12c, and stores these internal gains G1 to G3 in the nonvolatile memory 15i (step ST8).
- the internal gains G10, G20, and G30 and the desired output levels ⁇ , ⁇ ⁇ ⁇ , and q′YO stored in advance in the nonvolatile memory 15i are deleted.
- the audio device After the internal gains G1 to G3 are stored in the non-volatile memory 15i as described above, the audio device is shipped, but the user uses the audio device 10 to start from the audio source 12a.
- the audio switch 12 When the audio switch 12 is operated to connect the audio source 12a and the audio processing unit 15 by SW14, the CPU 15h has selected the audio source 12a by the audio selection signal. And set the internal gain G1 to the coefficient multiplier 15d.
- the CPU 15h sets the internal gain G2 in the coefficient unit 15d.
- the CPU 15h sets the internal gain G3 to the coefficient 15d.
- the CPU 15h functions as a gain setting unit and a gain storage unit.
- the internal gain is stored in advance in the nonvolatile memory 15i for each of the audio sources 12a to 12c, and when the audio source is selected by the switch switching unit 17, The internal gain corresponding to the selected audio source is also read out from the non-volatile memory 15 and set in the coefficient unit 15d, so that the internal gain is automatically adjusted to match the acoustic source. If the user can adjust the volume (gain adjustment) very easily, there is an effect.
- a reference internal gain is determined in advance as a reference internal gain, and an output level from the coefficient unit 15d is determined as a desired output level.
- the internal gain is obtained according to the output level detected by the level detector 15g, the reference internal gain, and the desired output level, and the internal gain is stored in the nonvolatile memory 15i. Even if there are variations in the embedded audio sources 12a to 12c, the internal gain is stored in the non-volatile memory 15i in consideration of the variations. As a result, it is always desired for each audio source in any audio device. The output level can be obtained.
- the CPU 15h includes a timer 21, an averaging unit (averaging unit) 22, a calculating unit (calculating unit) 23, and a coefficient determining unit (gain determining unit). Means) 24, a division unit 25, and an increase unit (gain setting changing means) 26, and now when viewing an audio signal output from one of the audio sources 12a to 12c (for example, Suppose that the audio signal output from the audio source 12a is viewed), and the user assumes that the internal gain is GA VI, and the user plays back and listens at a volume level corresponding to the internal gain GAV1 ( Step ST9).
- the output signal from the coefficient unit 15d is given to the level detector 15g, and the output level (that is, the first output level) is detected here.
- CPU15h receives the output level from level detector 15g, it starts timer 21 and counts the preset time.
- the averaging unit 22 obtains the time average value of the output level until the time up of the starting power of the timer 21, and uses this time average value as the measured value YAV1 (step ST10).
- the CPU 15h sets the internal gain (GAV2) corresponding to the audio source 12b in the coefficient unit 15d. (Internal gain switching: Step ST11). Then, when the audio source 12a is switched to the audio source 12b, the timer 21 is activated and counts a preset time.
- the coefficient determination unit 24 compares the output level YAV2 and the output level YAV1, and if the deviation (absolute value) exceeds a preset threshold level, in other words, if the deviation is large (YAV2>> YAV1 or YAV2 ⁇ YAV1: Step ST14), the coefficient determining unit 24 determines the internal gain to be the optimum internal gain GAV3 (Step ST15). On the other hand, if the deviation is equal to or lower than a preset threshold level, coefficient determining unit 24 keeps the internal gain GAV2 (keep as is: step ST16).
- the switch switching unit 17 when one of the audio sources 12a to 12c is selected as the selected audio source, another audio source other than the selected audio source is selected by the switch switching unit 17. Is selected, depending on the output level (first output level) associated with the selected audio source, the output level associated with another audio source (second output level), and the internal gain corresponding to the other audio source.
- the optimal internal gain is determined and the deviation between the first and second output levels exceeds a predefined threshold, the optimal internal gain is selected to replace the internal gain corresponding to another audio source.
- the audio source is switched, the output level of the previous audio source (selected audio source) and the output level after switching are switched. Considering the output level of the audio source (another audio source), the internal gain is determined, which has the effect of reducing the sense of discomfort caused by the volume change when the source is switched.
- the internal gain corresponding to the optimum internal gain and the audio source is changed when the internal gain corresponding to the audio source after the change is changed to the optimum internal gain. Since the internal gain set in the coefficient multiplier 15d is changed at predetermined time intervals by the quotient obtained by dividing the difference from the gain by a preset numerical value, it is caused by a sudden change in the internal gain. The effect is to reduce the sense of discomfort.
- the audio apparatus according to the present invention is suitable for smoothly adjusting the volume when selectively reproducing sound from a plurality of sound sources.
Landscapes
- Control Of Amplification And Gain Control (AREA)
- Circuit For Audible Band Transducer (AREA)
- Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/596,682 US8295511B2 (en) | 2004-09-03 | 2005-06-15 | Audio system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004-257396 | 2004-09-03 | ||
JP2004257396A JP4298613B2 (ja) | 2004-09-03 | 2004-09-03 | オーディオ装置 |
Publications (1)
Publication Number | Publication Date |
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WO2006027881A1 true WO2006027881A1 (ja) | 2006-03-16 |
Family
ID=36036175
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2005/010969 WO2006027881A1 (ja) | 2004-09-03 | 2005-06-15 | オーディオ装置 |
Country Status (3)
Country | Link |
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US (1) | US8295511B2 (ja) |
JP (1) | JP4298613B2 (ja) |
WO (1) | WO2006027881A1 (ja) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4719111B2 (ja) * | 2006-09-11 | 2011-07-06 | シャープ株式会社 | 音声再生装置、映像音声再生装置、及びその音場モード切り替え方法 |
JP4652302B2 (ja) * | 2006-09-20 | 2011-03-16 | シャープ株式会社 | 音声再生装置、映像音声再生装置、及びその音場モード切り替え方法 |
US20080144860A1 (en) * | 2006-12-15 | 2008-06-19 | Dennis Haller | Adjustable Resolution Volume Control |
JP5554624B2 (ja) * | 2010-04-27 | 2014-07-23 | 富士通テン株式会社 | 音響装置および信号制御方法 |
US9413322B2 (en) * | 2012-11-19 | 2016-08-09 | Harman International Industries, Incorporated | Audio loudness control system |
KR102411287B1 (ko) | 2017-11-22 | 2022-06-22 | 삼성전자 주식회사 | 미디어 출력 제어 장치 및 방법 |
Citations (5)
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JPH09186540A (ja) * | 1995-12-28 | 1997-07-15 | Fujitsu Ten Ltd | 騒音感応自動音量調整装置 |
JPH10282992A (ja) * | 1997-04-02 | 1998-10-23 | Ricoh Co Ltd | 音声処理装置 |
JPH10335960A (ja) * | 1997-05-29 | 1998-12-18 | Fujitsu Ten Ltd | 騒音感応自動音量調節装置 |
JP2001320793A (ja) * | 2000-05-10 | 2001-11-16 | Sony Corp | 自動利得調整装置 |
JP2003348682A (ja) * | 2002-05-24 | 2003-12-05 | Mitsubishi Electric Corp | 自動音量調整回路 |
Family Cites Families (11)
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JPH03188784A (ja) * | 1989-12-19 | 1991-08-16 | Toshiba Corp | ケーブルテレビジョンシステムの上りデータ通信信号制御装置 |
US5666424A (en) * | 1990-06-08 | 1997-09-09 | Harman International Industries, Inc. | Six-axis surround sound processor with automatic balancing and calibration |
US5404315A (en) * | 1991-04-30 | 1995-04-04 | Sharp Kabushiki Kaisha | Automatic sound gain control device and a sound recording/reproducing device including arithmetic processor conducting a non-linear conversion |
JPH0637563A (ja) | 1992-07-16 | 1994-02-10 | Sony Corp | 自動音量調整装置 |
KR0179968B1 (ko) * | 1993-08-31 | 1999-05-01 | 김광호 | 사운드신호 출력회로 및 그 방법 |
US5519641A (en) * | 1994-05-20 | 1996-05-21 | International Business Machines Corporation | Method and apparatus for configuring plural multimedia audio cards as a local area network |
US6868162B1 (en) * | 2000-11-17 | 2005-03-15 | Mackie Designs Inc. | Method and apparatus for automatic volume control in an audio system |
US7483539B2 (en) * | 2002-11-08 | 2009-01-27 | Bose Corporation | Automobile audio system |
KR100724836B1 (ko) * | 2003-08-25 | 2007-06-04 | 엘지전자 주식회사 | 디지털 오디오 기기에서의 오디오 출력 레벨 조절장치 및방법 |
US6826286B1 (en) * | 2003-09-26 | 2004-11-30 | Unitron Hearing Ltd. | Audio amplification device with volume control |
JP4241443B2 (ja) * | 2004-03-10 | 2009-03-18 | ソニー株式会社 | 音声信号処理装置、音声信号処理方法 |
-
2004
- 2004-09-03 JP JP2004257396A patent/JP4298613B2/ja not_active Expired - Fee Related
-
2005
- 2005-06-15 WO PCT/JP2005/010969 patent/WO2006027881A1/ja active Application Filing
- 2005-06-15 US US11/596,682 patent/US8295511B2/en not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH09186540A (ja) * | 1995-12-28 | 1997-07-15 | Fujitsu Ten Ltd | 騒音感応自動音量調整装置 |
JPH10282992A (ja) * | 1997-04-02 | 1998-10-23 | Ricoh Co Ltd | 音声処理装置 |
JPH10335960A (ja) * | 1997-05-29 | 1998-12-18 | Fujitsu Ten Ltd | 騒音感応自動音量調節装置 |
JP2001320793A (ja) * | 2000-05-10 | 2001-11-16 | Sony Corp | 自動利得調整装置 |
JP2003348682A (ja) * | 2002-05-24 | 2003-12-05 | Mitsubishi Electric Corp | 自動音量調整回路 |
Also Published As
Publication number | Publication date |
---|---|
US8295511B2 (en) | 2012-10-23 |
JP4298613B2 (ja) | 2009-07-22 |
US20080192958A1 (en) | 2008-08-14 |
JP2006074598A (ja) | 2006-03-16 |
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