JP3171508B2 - Sound correction device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound correcting device for an audio device.

[0002]

2. Description of the Related Art Tapes and compact discs (hereinafter referred to as "CDs") on which audio information such as music information is recorded.
For a sound signal obtained from a recording medium such as a sound source or other sound sources, a specific frequency band is emphasized using a parametric equalizer (hereinafter, referred to as “P-EQ”), or a digital sound processor (hereinafter, referred to as “DSP”). The technology relating to an adjustment system and an adjustment method of an audio device that performs so-called acoustic correction, such as performing sound field correction using the same, is widely known. In particular, in recent years, in-vehicle audio devices having such a function of acoustic correction have become widespread.

In such a vehicle-mounted audio device, the acoustic environment is not the same because the size and shape of the cabin, the material of the seat, the accessories in the vehicle, and the like differ depending on the vehicle. That is, even when the same sound correction operation setting is performed, the same sound effect is not always obtained.

Therefore, when installing such an audio device in a car, a specialist such as a dealer changes the parameter data of the DSP or P-EQ while listening to the sound actually output from the speaker after the installation. Then, the data is stored in a memory in the device, and an optimal adjustment is made to the acoustic environment of the vehicle.

[0005]

However, in the above-mentioned conventional technique, since the parameter data of the DSP and the P-EQ are changed while actually listening to the sound from the speaker, not only a large amount of time is required for the adjustment, but also the performance is increased. The result of the adjustment varies depending on the type of music to be played, the skill of the adjusting professional, and the mood at that time, and universal adjustment cannot be performed.

Therefore, an invention of an automatic adjustment system and an automatic adjustment method that can perform universal tuning of the acoustic correction means by the acoustic characteristic setting means in a short time has been proposed by the present applicant at the same time as the present application.

In such a system, tuning is performed by connecting the acoustic characteristic setting means to the acoustic correction means while maintaining the state in which the main unit for transmitting an audio signal obtained from a predetermined sound source is connected to the acoustic correction means. I have. That is, during such tuning, the system is constructed on the premise that no operation command is input from the main unit and the sound correction unit. However, if an operation command is input from the main unit or the sound correction unit for some reason, erroneous tuning may occur.

[0008] It is an object of the present invention to provide an excellent sound correction apparatus which can prevent erroneous tuning even when an operation command is erroneously input from the main unit or the sound correction means in the above system.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned conventional object, the present invention provides an audio correcting means for performing an audio correction on an audio signal obtained from a predetermined sound source based on an operation command from an operating means; A signal measuring means for measuring an output signal of the speaker based on a signal from the correcting means, an acoustic characteristic setting means for analyzing a signal obtained from the signal measuring means, and tuning the acoustic correcting means based on the analysis result; And control means for invalidating an operation command from the operation means when the sound correction means detects that tuning is being performed.

[0010]

Therefore, according to the present invention, erroneous tuning can be prevented even if an operation command is erroneously input from the main unit or the sound correction means during tuning.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a block diagram showing a configuration of a system to which a method for preventing erroneous tuning of an audio device according to the present invention is applied. In FIG. 1, among the connection lines connecting the blocks, those indicated by solid lines are signal lines for transmitting audio signals, and those indicated by dotted lines are control lines for transmitting control signals. Reference numeral 1 denotes a center unit as a main unit, which receives a command from a key operation unit to be described later and controls each unit as a sound source such as a tuner unit, a tape deck, a CD deck, and a CD autochanger by a master microcomputer mounted therein. The slave microcomputer of the source unit is intensively controlled via a computer line to select and output the source audio signal according to the operation.

Reference numeral 1a denotes a remote controller for remotely operating the center unit 1, and 1b denotes a key operation unit of the center unit 1. Operation commands from the remote controller 1a and the key operation unit 1b are transmitted through control lines.

Reference numeral 2 denotes a DSP unit as sound correction means, which performs sound correction on the sound signal output from the center unit 1 to convert the sound signal into a realistic sound field or a sound signal having a frequency characteristic desired by the user. Create. Reference numeral 3 denotes a power amplifier which amplifies and outputs an analog audio signal output from the DSP unit 2. The power amplifier 3 can amplify and output audio signals of up to 14 channels as described later. Reference numeral 4 denotes a speaker, which receives a sound signal from the power amplifier 3 and generates a sound.

Reference numeral 5 denotes an audio analyzer as acoustic characteristic setting means, which comprises an analyzer 6 and a personal computer 7. The control line between the personal computer 7 and the DSP unit 2 is constituted by RS232C, and the signal line from the analyzer 6 to the DSP unit 2 is constituted by an optical cable. Also, 8
Denotes a microphone, which inputs an audio signal obtained by collecting sound generated from the speaker 4 to the analyzer 6.

FIG. 2 is a block diagram showing the internal configuration of the DSP unit 2 in FIG. In FIG. 2, reference numeral 20 denotes an audio input unit which selectively selects either an audio signal output from the center unit 1 or a reference audio signal output from the analyzer 6 according to a given selection signal. Output. Reference numeral 21 denotes a P-EQ, which emphasizes a specific frequency band by given parameter data and corrects the frequency characteristics of the input audio signal.

Reference numeral 22 denotes a network adjustment unit, which is a P-E
The audio signal transmitted from Q21 is divided into a plurality of frequency bands and output, and a so-called time alignment correction for adjusting a transmission time to reach each speaker is also performed. Reference numeral 23 denotes a communication unit which processes a control signal transmitted to and from the personal computer 7, and in this embodiment, is constituted by an RS232C interface. A microcomputer 24 controls the operation of the DSP unit 2. 25 is a backup memory, P-EQ
21, storage means for storing parameter data of time alignment and network gain, which is constituted by an E2 PROM or the like.

Reference numerals 26 to 29 denote D / A converters, which convert digital audio signals for each band transmitted from the network adjuster 22 into analog audio signals. The D / A converter 26 is for a subwoofer, and converts and outputs an ultra-low frequency audio signal of the L channel and the R channel. The D / A converter 27 is for a woofer, and has an L channel and an R channel for the front and rear, respectively.
The audio signals of a total of four channels in the low band of the channel are converted and output. Similarly, the D / A converters 28 and 29 convert the middle-range and high-range audio signals of the L channel and the R channel for the front and rear, respectively, into four channels and output the converted signals. Reference numeral 30 denotes a key input unit, which can input the same operation command as the operation command from the center unit 1.

FIG. 3 is a block diagram showing the internal configuration of the audio analyzer 5 in FIG. In the analyzer section 6 of FIG. 3, reference numeral 60 denotes a microphone sound analysis section, which converts an analog audio signal input from the microphone 8 into a digital signal, analyzes the audio signal by a built-in microcomputer, and sends out analysis data. At the same time, a control signal is transmitted to and from the personal computer 7. Reference numeral 61 denotes a measurement noise generation unit which sends a reference audio signal, which is pink noise for measurement, to the DSP unit 2 and transmits a control signal to and from the personal computer 7 by a built-in microcomputer.

In the personal computer unit of FIG. 3, reference numeral 70 denotes a control unit constituted by a microcomputer or the like. As described above, a control signal is transmitted between the microphone sound analysis unit 60 and the measurement noise generation unit 61 of the analyzer unit 6. Transmit. Reference numeral 71 denotes a communication unit, which controls the parameters of the P-EQ adjustment unit 21 of the DSP unit 2, the time alignment and the network gain of the network adjustment unit 22, based on the communication procedure of the RS232C with the communication unit 23 of the DSP unit 2. A control signal and data for determination are transmitted.

Reference numeral 72 denotes a key input unit which can set the frequency characteristic of the audio signal to a desired characteristic curve (hereinafter, referred to as a "target curve") by operating a key. A display unit 73 displays a main menu, a tuning menu, a speaker connection confirmation, and the like when performing automatic adjustment, and displays various data during adjustment. A printing unit (printer) 74 can print not only the result data after the completion of the adjustment but also any data during the adjustment.

Reference numeral 75 denotes a data storage unit which stores P-EQ2 in a recording medium such as a floppy disk or a hard disk.
1. Time alignment, network gain parameter data and target curve data can be stored and saved. Therefore, after the current setting data is stored in the data storage unit 75 when performing the automatic adjustment, it is possible to return to the original setting data even if the desired characteristic cannot be obtained as a result of the automatic adjustment.

In the system configuration shown in FIGS. 1 to 3, the reference audio signal from the measurement noise generating unit 61 is supplied to the DSP unit 2 by an optical cable, and is input to the speaker 4 through the power amplifier 3. Then, a sound signal obtained by collecting sound from the speaker 4 with a microphone is input to the microphone sound analysis unit 60 and analyzed. Communication is performed with the DSP unit 2 based on the analysis result, and the DSP unit 2 is tuned automatically or manually. In the case of automatic tuning, the adjustment time can be set to about 30 minutes, and universal adjustment can be performed without being affected by the skill and mood of the expert to be adjusted. Further, even when data for sound correction stored in the memory is lost, the same sound correction can be adjusted based on the data stored in the data storage unit 75 of the personal computer unit 7.

During this tuning, the center unit 1 is connected to the DSP unit 2 together with the audio analyzer 5. This means that after the tuning is completed, the actual audio signal and control signal from the center unit 1 are input, and the tuning state is actually heard with the sound from the speaker 4 by ear without changing the connection one by one. It is convenient to do. On the other hand, it is necessary to take measures to prevent erroneous tuning even if an operation command from the center unit 1 or an operation command from the key input unit 30 of the DSP unit 2 is erroneously input during the tuning.

FIGS. 4 to 6 are flowcharts showing an operation for preventing such erroneous tuning. Less than,
A method for preventing erroneous tuning according to the present invention will be described with reference to FIGS. FIG. 4 is a flowchart showing the operation of the audio analyzer 5, and FIG.
FIG. 6 is a flowchart showing the operation of the unit 2, and FIG. 6 is a flowchart showing the operation of the center unit 1.

In FIG. 4, when the tuning mode by the audio analyzer 5 is started (step S1)
1) A "key acceptance prohibition command" for prohibiting key input from the remote controller 1a, the key operation unit 1b, and the key input unit 30 of the DSP unit 2 is transmitted to the DSP unit 2 (step S).
12). Thereafter, the tuning operation is started (step S13), and the end of the tuning is determined (step S13).
14) When it is finished, it is determined whether or not key input of the remote controller a or the like is prohibited (step S15). If the key input is prohibited, the key input is released, and a "key acceptance permission command" for permitting the key input is transmitted to the DSP unit 2 (step S16).

In FIG. 5, the DSP unit 2 sends a “key acceptance prohibition or permission command” from the audio analyzer 5.
Is received (step S21), it is determined whether or not the received command is a prohibited command (step S2).
2) If the command is not a prohibition command, the reception of the key input from the key input unit 30 is permitted, and the "key reception permission command" is transmitted to the center unit 1 (step S23). On the other hand, if the received command is a “key acceptance prohibition command”, the key input unit 3
The reception of the key input from 0 is prohibited, and the "key reception prohibition command" is transmitted to the center unit 1 (step S24).

In FIG. 6, the center unit 1 has a DS
When a "key acceptance prohibition or permission command" is received from the P unit 2 (step S31), it is determined whether or not the received command is a prohibition command (step S32).
If the command is not the “key acceptance prohibition command”, acceptance of a key input from the remote controller 1a and the key operation unit 1b is permitted (step S33). On the other hand, if the received command is a “key acceptance prohibition command”, acceptance of key input from the remote controller 1a and the key operation unit 1b is prohibited (step S34).

As described above, while the audio analyzer 5 is being tuned, the key input of the remote controller 1a or the like of the center unit 1 is prohibited, so that erroneous tuning due to an erroneous operation or the like can be prevented.

[0030]

According to the present invention, as is apparent from the above embodiment, while the acoustic characteristic setting means is tuning the acoustic correction means of the audio apparatus, the key input from the remote controller or the key operation section of the audio apparatus is prohibited. Even when an operation command is given to the sound correcting means due to an erroneous operation or the like, erroneous tuning can be prevented.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an acoustic correction device according to the present invention.

FIG. 2 is a block diagram showing an internal configuration of a DSP unit 2 in FIG.

FIG. 3 is a block diagram showing an internal configuration of an audio analyzer 5 in FIG.

FIG. 4 is a flowchart showing a procedure for preventing erroneous tuning of the audio analyzer in the embodiment of the present invention.

FIG. 5 is a flowchart showing a procedure for preventing erroneous tuning of the DSP unit in the embodiment of the present invention.

FIG. 6 is a flowchart showing a procedure for preventing erroneous tuning of the center unit in the embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 center unit (main unit) 1a remote controller 1b key operation unit 2 DSP unit (acoustic correction unit) 4 speaker 8 microphone 5 audio analyzer (acoustic characteristic setting unit) 30 key input unit

──────────────────────────────────────────────────続 き Continuation of the front page (51) Int.Cl. ⁷ Identification code FIG10K 15/00 L (56) References JP-A-60-233963 (JP, A) JP-A-59-174093 (JP, A) Hikaru 1-139616 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04R 3/04 G10K 15/00 H04Q 9/00 301 H04R 5/04 H04S 7/00

Claims (1)

(57) [Claims] 1. A sound for performing sound correction on a sound signal obtained from a predetermined sound source based on an operation command from an operation means.
Sound correction means, and a speaker output signal based on a signal from the sound correction means.
Signal measuring means for measuring the signal, and analyzing the signal obtained from the signal measuring means,
Tune the sound correction means based on the result
Detecting that the acoustic characteristic setting means and the acoustic correction means are tuning.
Control means for invalidating the operation command from the operation means when the
Acoustic correction apparatus characterized by comprising: a stage, a.