JPH0516735A - Audio reproduction device - Google Patents

Abstract

PURPOSE:To enable users to select easily the optimally adjusted surround effect sounds with every taking seat by constituting in such a way that the surround effect can be switched in accordance with the selectively taken seat. CONSTITUTION:There are provided a correcting function to correct acoustic characteristics optimally with every taking seat and a surround function to add reflected sounds and reverberating sounds. Since an effect quantity (parameter) to give the optimal surround effect is provided separately with every taking seat in a vehicle room, the effect quantity can be changed in accordance with seat taking switches 32a-d to select the taking seat by providing surround switches 34a-d to select the surround. Since the parameter is memorized in memory 38, upper bits of address in which the parameter is memorized can be changed by means of the seat taking switches 32, and lower bits can be also changed by means of the surround switches 34.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound reproducing device such as a car stereo mounted on an automobile.

[0002]

2. Description of the Related Art The structure of a conventional example will be described with reference to FIG. FIG. 7 is a block diagram showing a conventional sound reproducing device disclosed in, for example, Japanese Patent Laid-Open No. 61-257099.

In FIG. 7, 1 is a source of music or the like such as a CD player, 2 is a preamplifier, 3 is a processor for adding reflected sound, 4 is a power amplifier, 5 is a speaker, and 6 is an effect such as reflected sound. Switch 7 for changing the remote controller, 7 for a remote controller sensor interface for receiving signals from the remote controller 7, 9 for controlling the processor 3, 10 for storing reflected sound parameters, and 11 for a reproduced signal from the source 1. This is a signal processing unit that adds reflected sound and reverberant sound to.

Next, the operation of the above-mentioned conventional example will be described. For example, the music signal reproduced from the source 1 is adjusted in volume by the preamplifier 2 and input to the processor 3. The music signal is once converted from an analog signal to a digital signal by the processor 3, and then a reflected sound and a reverberant sound are added by the signal processing unit 11. The digital signal to which the reflected sound or the like is added is inversely converted into an analog signal, amplified by the power amplifier 4, and emitted from the speaker 5 to the room.

When one of the switches 6 of the remote controller 7 is pressed, the signal of the pressed switch 6 is sent to the microcomputer 9 via the remote controller sensor interface 8. Then, the parameter such as the reflected sound corresponding to the switch 6 is read from the memory 10 and sent to the processor 3, and the effect of the reflected sound or the like is changed. The memory 10 stores parameters such as a reflected sound obtained in different rooms such as a large concert hall and a church with extremely long reverberation.

On the other hand, since the total length of the passenger compartment of an automobile is about 2.5 m, the total width is about 2 m, and the total height is about 1.5 m, the distance between the seat and the speaker is short, and the position of the seat is not a target. Has become. Therefore, the reverberation time is 0.1 s
The acoustic characteristics such as volume balance, frequency characteristics, and reflected sound structure are different from those of a room in a general home because the sound is as short as ec and there are many indoor reflected sounds due to window glass.

Therefore, when the above-described conventional sound reproducing device is used in the passenger compartment of an automobile, it is necessary to adjust parameters such as reflected sound and volume balance before and after use. This adjustment is done by sitting in the driver's seat in the passenger compartment, pressing one of the switches 6 to read, for example, the parameters of the concert hall, and while listening to the music, press another switch 6 to change the parameters and listen to the music again. The operation of changing is repeated.

There is not one type of reflected sound parameter, but there are many reflected sound delay times, their levels, frequency characteristics, etc., so it is not easy to find an optimum value by repeating trial and error. Furthermore, since acoustic characteristics differ depending on seats such as a driver seat and a rear seat in the passenger compartment, it is necessary to adjust each seat.

[0009]

In the conventional sound reproducing apparatus as described above, the user himself has to make adjustments by trial and error, and also has to make adjustments every time the seat is changed. was there.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to obtain a sound reproducing device capable of easily creating an optimum acoustic environment for each seat in the passenger compartment. And

[0011]

The sound reproducing device according to the present invention comprises the following means. [1] Seating input means for selectively inputting seating. [2] Surround input means for selectively inputting any surround. [3] Memory means for pre-storing first and second parameters corresponding to the seating and surround and reading out the first and second parameters corresponding to when the seating and surround are selected. [4] Seating processing means for processing the reproduction signal based on the first parameter. [5] Surround processing means for processing the reproduced signal based on the second parameter and adding it to the output of the seating processing means.

[0012]

In the present invention, the seating input means selects and inputs the seating, and the surround inputting means selects and inputs any surround. Further, the memory means stores in advance the first and second parameters corresponding to the seating and the surround, and the first and second parameters corresponding to when the seating and the surround are selected.
Parameters are read. Further, the seating processing means processes the reproduction signal based on the first parameter. Then, the surround processing means processes the reproduced signal based on the second parameter and adds the processed signal to the output of the seating processing means.

[0013]

【Example】

Example 1. The configuration of the first embodiment of the present invention will be described with reference to FIG. 1 is a block diagram showing a first embodiment of the present invention.

In FIG. 1, 21 is a CD player, 22
Is a position processor, 23 is a surround processor, 24a
~ 24d is a power amplifier, 25 is a passenger car, 26L, 26
R is a left and right front speaker, and 27L and 27R are left and right rear speakers. In the position processing unit 22, 28a to 28d are delays, 29a to 29d are equalizer circuits, and 30a to 30d are attenuators. In the surround processing section 23, 31a is a surround circuit that processes the input music signal, and 31b is an adder that adds the music signal output from the surround circuit 31a to the output of the position processing section 22.

Further, 32a to 32d are seating switches for selecting the seat on which the user in the passenger car 25 is seated, 33
Is a seating code generation circuit that generates a code corresponding to the selected seating switches 32a to 32d, 34a to 34d are surround switches by which the user selects a predetermined surround effect amount such as hole A or hole B, and 35 is a select switch The surround code generating circuit generates a code corresponding to the selected surround switches 34a to 34d.

Further, 36 is an address generation circuit for generating a stored address value of a parameter group for performing position processing and a parameter group for performing surround processing at the corresponding sitting from the sitting code and the surround code, and 37 is a position. A control circuit that rewrites the parameter groups of the processing unit 22 and the surround processing unit 23, and 38 is a memory that stores the parameter groups.

Incidentally, the seating input means of the present invention is the seating switches 32a to 32d in the first embodiment of the present invention described above.
And the seating code generating circuit 33, the surround input means of the present invention is composed of the surround switches 34a to 34d and the surround code generating circuit 35 in the first embodiment, and the memory means of the present invention is the address generating circuit 36 in the first embodiment. A control circuit 37 and a memory 38. The seating processing means of the present invention corresponds to the position processing section 22 in the first embodiment, and the surround processing section of the present invention corresponds to the surround processing section 23 in the first embodiment. To do.

Next, the operation of the above-described first embodiment will be described. The music signal reproduced from the CD player 21 is input to the position processing unit 22. In this Example 1, C
An example is shown in which the digital signal is input from the D player 21 to the position processing unit 22 as it is without passing through the digital / analog converter. The position processing unit 22 determines the transmission characteristics between the speakers 26L, 26R, 27L, 27R and the seats by the delays 28a to 28d and the equalizer circuit 29.
It is corrected by a to 29d and attenuators 30a to 30d.

For example, in the front right driver's seat, since the front speaker 26R for the right channel is closer to the front speaker 26L for the left channel, the sound arrives faster,
Also, the volume is loud. Therefore, in the delay 28b, a time delay of 0.5 ms to 2 due to the distance difference between the speakers 26L and 26R.
The music signal is delayed by ms, and the attenuator 30b attenuates the music signal by a sound volume difference of 0 dB to 6 dB.

Further, in the front speakers 26L and 26R, a speaker unit having a small diameter is attached without the seating direction being set on the front axis, and the reproduced sound pressure frequency characteristics are varied due to the influence of the window glass and the interior material in the passenger compartment. Occurs. Therefore, in the equalizer circuit 29b, for example, it is attenuated by 6 dB around 1.5 KHz to correct the transfer characteristic.

Since the transmission characteristic with each speaker differs depending on the seating, the delay of the delays 28a to 28d, the equalizing characteristics of the equalizer circuits 29a to 29d, and the attenuation amount of the attenuators 30a to 30d are different for each seating. Corrected by the value. That is, the parameter value that determines the correction value also differs for each seat.

For example, when the user sits in the driver's seat and selects the driver position, the correction process is performed on the input signal of the speaker 26R as described above, and the input signal of the other speakers 26L, 27L, 27R also causes the driver's seat to enter. Corrected to have the optimum characteristics.

Next, when the user sits in the rear seat and selects the rear position, the delays 28a to 28d are delayed by the equalizer circuits 29a to 29d so that the rear seats also have the optimum characteristics.
29d equalize characteristics, attenuators 30a-30d
The correction process is performed according to the attenuation amount of. Once the vehicle interior shape, speaker layout, and interior material layout are determined, each transfer characteristic can be measured in the vehicle interior, and the correction value can be optimally determined from the inverse characteristics.

The music signal corrected by the position processing unit 22 is input to the surround processing unit 23. The surround processing unit 23 adds an initial reflection sound and a reverberation sound to the music signal, and reproduces the impression of listening to music in a pseudo manner in a concert hall or a church.

Next, the above-mentioned surround circuit 31a.
This will be described with reference to FIG. FIG. 2 is a circuit diagram showing a surround circuit according to the first embodiment of the present invention. In FIG. 2, reference numerals 40L and 40R denote filter circuits that give frequency characteristics to reflected sounds and reverberant sounds, 41L and 41R are delays that determine the delay time of the primary reflected sound, and 42L and 42R are secondary delays together with the delays 41L and 41R. Delay that determines the delay time of sound, 43 is a reverb that generates reverberant sound, 44L
~ 46L, 49L ~ 55L, 44R ~ 46R, 49R ~
55R is an attenuator that determines the ratio to be added.

By the way, the reverb 43 is, for example, as shown in FIG.
When the all-pass filter circuit shown in (1) is used, so-called coloration is small and natural reverberation sound can be obtained. Figure 4
In the figure, 60, 62 and 63 are attenuators and 61 is a delay. The parameters that determine the amount of reverberation in the all-pass filter circuit are the attenuation amount g and the delay time of the delay 61.

In the surround circuit 31a of FIG. 2, the music signals input from the input terminals L and R are band-limited by the filter circuits 40L and 40R, for example, 7 KHz.
Pass the ingredients up to. The band-limited music signal is
The delays 41L and 41R delay the time, the attenuators 45L and 45R attenuate the delay, and the delayed signals are output to the output terminals FL and FR. This is the processing of the primary reflected sound input to the front speakers 26L and 26R, respectively. Attenuator 46 for rear speakers 27L and 27R
It is attenuated by L and 46R and output to the output terminals RL and RR.

The secondary reflected sound is delayed by delays 42L and 42R after the delays 41L and 41R,
Further, the signals are attenuated by the attenuators 50L and 50R and output to the output terminals FL and FR.
It is attenuated by L and 51R and output to the output terminals RL and RR.

The reverberation is generated by the reverb 43 after being attenuated by the attenuators 49L and 49R after the delays 42L and 42R and being added. The generated reverberation is attenuated by the attenuators 54L and 54R and output to the output terminals FL and FR, and similarly the attenuator 55.
It is attenuated by L and 55R and output to the output terminals RL and RR.

The outputs of the filter circuits 40L and 40R pass through the attenuators 44L and 44R, are then subtracted, are attenuated by the attenuators 52L and 52R, and are output to the output terminals FL and FR.
It is attenuated by L and 53R and output to the output terminals RL and RR. This process is an indirect sound process for mixing the difference component of the left channel and the right channel with the direct sound.

In FIG. 1, the music signal processed by the surround circuit 31a is added to the output from the position processing unit 22 by the adder 31b in the surround processing unit 23, and power amplified by the power amplifiers 24a to 24d. The sound is emitted from the speakers 26L, 26R, 27L, 27R into the passenger compartment of the passenger car 25.

Next, the subordinate selection of seating and surround will be described. The seating switches 32a to 32d are switches for the user to select a seating, and the seating code generating circuit 33 is a circuit for generating a code corresponding to the selected switch. Seating switches 32a-32d
A key matrix can be used for the key matrix, and its configuration example is shown in FIG. In FIG. 4, SW1, SW2, SW3 and SW
4 are push-button switches for selecting driver seats, front seats, rear seats and all seats, P ₀ , P ₁ , P ₂ and P _{3 respectively.}
Is an output terminal that produces an output when the connected switch is pressed.

The seating code generation circuit 33 generates a code from the outputs of the output terminals P _{0 to} P ₃ when a certain switch is pressed. An example of the code is shown below.

[0034]

The inputs SW1 to SW4 are seating switches 32a.
32d, and the outputs P _{0 to} P ₃ are the outputs of the output terminals P _{0 to} P ₃ . For example, when the switch SW1 is pressed, "1100" is generated in binary.

The surround switches 34a to 34d are switches for selecting the surround effect amount of a live house, a concert hall, a church, a stadium, etc.
The following configurations can be used. Surround code generation circuit 35
Generates a code from the output of the key matrix, depending on which switch is pressed. For example, in FIG. 4, switches SW1 to SW4 are set to SW5 to SW8 and outputs P ₀ to
Replacing P ₃ with S _{0 to} S ₃ , respectively, the code becomes as follows.

[0037]

[0038] SW5~SW8 the switch, such as a live house, output S ₀ ~S ₃ is the output of the Kyi matrix. For example, when SW5 is pressed, a binary number "1100" is generated.

The address generating circuit 36 uses the codes generated from both the sitting code generating circuit 33 and the surround code generating circuit 35 to generate an address value in which each parameter is stored. An example of the address value is shown in FIG. The seating parameter shown in FIG. 5A is a parameter for performing signal processing of the position processing unit 22, and for example, the delay time of the delay 28a is 2 bytes, and the coefficient of the secondary equalizer circuit 29a is 3 bytes × 5. , And the coefficient of the attenuator 30a is 2 bytes, it is sufficient that one seating switch has 76 bytes.

In the address value of FIG. 5 (a), the mark x is an arbitrary binary number, and P ₂ and P ₃ are the output values described above. If the starting address in which the seating parameter of the switch SW1 is stored is “1000” in hexadecimal, the switch SW2
~ The start address of the seating parameter of SW4 is "11".
00 "," 1200 "," 1300 ". The control circuit 37 is a circuit composed of a logic circuit or a microcomputer, and reads the above-mentioned start address value generated by the address generation circuit 36 and reads it from a ROM or the like. The parameter is read from the corresponding address of the memory 38 and transmitted to the position processing unit 22.

Next, the address value of the surround parameter will be described. The address value for this surround parameter is generated from the outputs of both the seating switch and the surround switch. An example of the address value is shown in FIG. In the address value of the surround parameter, the X mark is an arbitrary binary number, P ₂ and P ₃ are the output values described above,
S ₂ and S ₃ are output values generated from the pressed surround switch. In the address value, the seating code generation circuit 33
The codes P ₂ and P ₃ of the above are arranged above the codes S ₂ and S ₃ of the surround code generating circuit 35.

For example, the switch SW1 and the switch SW5
When is pressed, P ₂ and P ₃ are “00”, S ₂ and S ₃ are “0”.
The address value becomes 0 ", and the address value becomes" x0xx "in hexadecimal noting the x mark arbitrarily. For example, the start address is selected as" 2000 "so as not to overlap with the memory area of the seating parameter described above. The address value when SW1 and SW5 are pressed is "2000", and the switch S
When W1 and SW6 are pressed, the address value is "210
When the switches SW5 to SW8 are pressed, the lower bits of the address value are changed, and when the switches SW1 to SW4 are pressed, the upper bits of the address value are changed.

FIG. 6 shows a memory map of parameters. From address "2000", the parameters when SW1 and SW5 are pressed are stored.
From 00 ", parameters when SW1 and SW6 are pressed are stored. When the address value is generated as described above, the effect amount of the surround can be selected depending on the seating switch.

The first embodiment described above aims to provide an apparatus capable of easily selecting and reproducing the reflected sound and the reverberant sound that are optimally adjusted for each seat in the passenger compartment. That is, it has a correction function for optimally correcting the acoustic characteristics for each seat and a surround function for adding reflected sound and reverberant sound. Since the effect amount (parameter) that gives the optimum surround effect is different for each seat in the passenger compartment, a surround switch for selecting surround is provided depending on the seat switch that selects seat, and the effect amount is I decided to change. The parameter is stored in the memory 38, and the upper bit of the address where the parameter is stored is changed by the seating switch, and the lower bit is changed by the surround switch.

The first embodiment of the present invention, as described above,
Since the surround effect is switched depending on the seating selected, the user can easily select the surround sound effect optimally adjusted for each seating.

[0046]

As described above, according to the present invention, the seating input means for selectively inputting the seating, the surround inputting means for selectively inputting any surround, and the first and the first corresponding to the seating and the surround. Memory means for storing the two parameters in advance and reading the first and second parameters corresponding to the seating and surround selection, and the seating for processing the reproduction signal based on the first parameter Since the processing means and the surround processing means for processing the reproduction signal based on the second parameter and adding it to the output of the seating processing means are provided, it is optimally adjusted for each seating in the passenger compartment. It has an effect that an acoustic environment can be easily created.

[Brief description of drawings]

FIG. 1 is a block diagram showing a first embodiment of the present invention.

FIG. 2 is a circuit diagram showing a surround circuit according to the first embodiment of the present invention.

FIG. 3 is a diagram showing a reverb according to a first embodiment of the present invention.

FIG. 4 is a diagram showing a configuration of a seating switch and a surround switch according to the first embodiment of the present invention.

FIG. 5 is a diagram showing address values according to the first embodiment of the present invention.

FIG. 6 is a diagram showing a memory map according to the first embodiment of the present invention.

FIG. 7 is a block diagram showing a conventional sound reproducing device.

[Explanation of symbols]

22 Position processing unit 23 Surround processing section 25 passenger cars 32a-d Seating switch 33 Seating code generator 34a-d surround switch 35 surround code generator 36 address generation circuit 37 Control circuit 38 memory

Claims (3)

[Claims] 1. A seating input means for selectively inputting seating,
Surround input means to select and input any surround,
Memory means for pre-storing the first and second parameters corresponding to the seating and surround and reading out the first and second parameters corresponding to the seating and surround selected, and the reproduction signal for the first and second parameters The seating processing means for performing processing based on the first parameter, and the surround processing means for processing the reproduction signal based on the second parameter and adding the output to the output of the seating processing means. Sound reproduction device. 2. The upper bit of the address of the second parameter stored in the memory means is composed of an output signal of the seating input means, and the lower bit of the address is composed of an output signal of the surround input means. The sound reproducing device according to claim 1, wherein: 3. The surround processing means comprises an additional circuit for adding an initial reflected sound and a reverberant sound, and a mixing circuit for extracting a difference component of a stereo signal and mixing it with the original stereo signal. The sound reproducing device according to item 1.