JP2527846B2 - Sound reproduction device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Outline] The present invention is a sound reproducing device in which a fader control circuit and a sound field control device are connected in parallel, and is used for switching between operation and non-operation of the sound field control device. Nevertheless, the fader control circuit does not need to be adjusted, and the ease of use of the sound reproduction device during driving of the vehicle is improved.

[Industrial applications]

The present invention relates to an audio system mounted on an automobile.

In recent years, it has been common for audio systems installed in automobiles to reproduce stereo sound from multiple speakers, and to reproduce the sound volume from the speakers arranged on the left and right and from the speakers arranged on the front and rear seats. Many are equipped with a fader control circuit that adjusts the playback volume.

In particular, the present invention refers to the most improved improvement in use when a sound field control device for reproducing a sound effect of a concert hall or the like is incorporated in an audio system via the fader control circuit.

[Conventional technology]

In general, the fader control circuit adjusts the playback volume from the speakers placed in the front and rear seats of the vehicle, or the playback volumes from the speakers placed on the left and right sides of the car to give the listener a sense of forward localization in each seat. Adjust. On the other hand, the sound field control device is, for example, a DSP (Digital Signal Processor) sound system, and is disclosed in Japanese Patent Laid-Open Nos. 1-220599 and 1-220600.

FIG. 11 is a diagram showing a conventional sound field reproducing device. In addition,
Similar components are denoted by the same reference numerals throughout the drawings. The configuration of this figure divides the acoustic signal V _L and adjusts the balance of the divided signals, a fader control circuit 1, a sound field control device 2 which is alternatively selected from the fader control circuit 1, and the fader control. The circuit 1 and the switch section 3 for selecting the sound field control device 2 are included, and only the left side of the stereo signal is shown for simplification of description.

The fader control circuit 1 adjusts the volume balance of, for example, the front seats and the rear seats when a plurality of speakers are provided in the automobile, and a detailed description will be given in the section of the embodiment.

The sound field control device 2 reproduces the realism of an actual performance hall. Direct sound that music directly reaches the source signal from the sound source, initial reflected sound that arrives after rebounding on the ceiling or wall, and complicated paths. By artificially creating the component of the residual sound that arrives late, a sound field such as a concert hall, a live house, a church, a stadium, etc. is created. These sound fields can be selected according to the type of music and user's preference, the sound field of the concert hall is suitable for reproducing symphonies by a full orchestra, and the sound field of a live house is a small jazz or piano in front of you. It is suitable for reproducing the performance, the sound field of the church is suitable for reproducing the pipe organ performance, and the sound field of the stadium is suitable for reproducing the loud volume of an outdoor concert.

By the way, in a sound reproducing device in which the number of listeners or the listening position changes, such as a sound reproducing device mounted on a vehicle in the related art,
By controlling the reproduction level of the acoustic signal reproduced from each speaker, the localization position of the sound field is adjusted to listen to the sound. Therefore, in the on-vehicle sound reproducing device, the left and right balances are adjusted according to the number of passengers and their seating positions, for example, when only one driver is present or when there is a passenger in the rear seat. The fader control circuit 1 including a volume and front and rear fader volumes may be adjusted to localize the sound field to a desired position.

On the other hand, the sound field configuration device 2 configured by using a digital signal processor, for example, assumes that a signal of each channel from an acoustic signal source is input in the original signal level relationship, for example, a fader control circuit. 1 is designed and adjusted on the assumption that the left and right signal levels or the front and rear signal levels are not adjusted. That is, the sound field configuration device 2 is configured to obtain the maximum effect when the balance volume and the fader volume are in the center position.

Therefore, in the conventional sound field configuring device, in order to maximize its effect, the adjustment of the balance volume and the fader volume to the center position must be performed manually.

[Problems to be Solved by the Invention]

However, in the above-mentioned conventional technique, when the listener selects the sound field control device 2, the balance volume and the fader volume must be adjusted. When the sound field control process is deselected, the balance volume is adjusted again so that the sound field is at the desired localization position, that is, the level of the acoustic signal reproduced from each speaker is at the desired level. Also, the fader volume must be adjusted, and the operation is complicated. In particular, it is necessary to change the reproduction signal levels of the front and rear seat speakers and the reproduction signal levels of the left and right speakers according to the condition of the occupant. Even when the sound field control device 2 is attached and used later, there is a problem that the same operational complexity as described above occurs.

Therefore, in view of the above problems, it is an object of the present invention to provide a sound reproducing device that can easily use a sound field control device even in an audio system having a conventional fader control circuit.

[Means for solving the problem]

FIG. 1 is a diagram showing the principle configuration of the present invention. In order to solve the above-mentioned problems, the present invention separates an acoustic signal from an acoustic signal source into an acoustic signal of a front channel and an acoustic signal of a rear channel, and separates an acoustic signal of a front channel and an acoustic signal of a rear channel. A sound field control that forms a desired sound field by performing arithmetic processing on a sound signal from a sound signal source and a fader control circuit 1 that adjusts a signal level to generate a sound signal of a front channel and a sound signal of a rear channel. The device 2, the selection switch SW1 for selecting the operation / non-operation of the sound field control device 2, and the adjustment amounts of the signal levels of the front channel acoustic signal and the rear channel acoustic signal in the fader control circuit 1 are input. The sound field control device 2 is operated or deactivated based on the operation of the fader operation units SW2 and SW3 and the selection switch SW1, and A control unit 4 for operating the fader control circuit 1 based on the operation of the fader operation units SW2, SW3, the fader control circuit and the sound field control device 2 are connected in parallel to an acoustic signal source, and the fader control is performed. The switch means 3 is provided for inputting either one of the output of the circuit 1 and the output of the sound field control circuit 2 to the speakers arranged in front of and behind the listener, and the switch means 3 includes the controller 4 When the operation of the sound field control circuit 2 is selected by the selection switch SW1, the output of the sound field control circuit 2 is input to the speakers arranged in front of and behind the listener, and When the non-operation of the sound field control circuit 2 is selected by the selection switch SW1, the output of the fader control circuit 1 is input to the speakers arranged in front of and behind the listener. To, is switched.

During operation of the sound field control device 2, there is provided a control unit 4 that changes the arithmetic processing of the sound field control device 2 depending on the operation amount of the fader operation unit.

The control unit 4 outputs each output channel FL-2 in the sound field control device according to the operation amount of the fader operation unit,
It controls the signal levels of the FR-2, RL-2, and RR-2 signals.

[Work]

In FIG. 1, according to the sound reproducing device of the present invention, the fader control circuit 1 and the sound field control device 2 are connected in parallel to the sound source, and the sound field control device 2 is switched by the switch means 3.
Is selectively connected directly to the sound source, the sound field control device 2 can reproduce the sound field regardless of how the balance volume and fader volume of the fader control circuit 1 are adjusted. Become. If the sound field control device 2 is deselected, the balance volume and fader volume of the fader control circuit 1 are in the original state, and thus the conventional adjustment becomes unnecessary. The control unit 4 saves the operation amount of the fader operating unit while the sound field control device 2 is operating, and the arithmetic processing of the sound field control device 2 can be changed using the fader operating unit. If the circuit and the operation part of the sound field control device 2, such as a switch button, are operated separately, the adjustment position of the balance volume may be displaced, but such an erroneous operation can be prevented and the fader operation part is Since it can be shared, it can be effectively used in a narrow space in a car.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 2 is a diagram showing a sound reproducing device according to the first embodiment of the present invention. The configuration of this figure will be described below. In the configuration of the sound reproduction device of this figure, a fader control circuit 1 that divides an input signal (Si) and weights the divided signals, and the fader control circuit 1 connected in parallel to the input signal ( S
i) The sound field control device 2 that gives a feeling of expansion, the switch unit 3 that selectively selects the fader control circuit 1 and the sound field control device 2, and the switch unit 3 is switched by the push button SW1, for example, a push button. A control unit 4 for adjusting the fader control circuit 1 by SWs 10 and 11 and further adjusting the sound field control device 2 by push buttons 12 and 13 is included. The configurations of the fader 1 and the sound field control device 2 will be described in the section of the second embodiment.

Next, the operation will be described. When SW1 is OFF, the control unit 4 selects the sound field control circuit 2 via the switch unit 3, and SW10 and 11 adjust the spread feeling of the sound field control circuit 2 via the control unit 4. When SW1 is turned on and the fader 1 is selected by the control unit 4 via the switch unit 3, the weights of the divided signals of the fader 1, that is, the balance volume is adjusted by the SW 12 and SW 13 via the control unit 4, The volume of the front and rear seats of the car is adjusted.
Therefore, the adjustment of the balance volume of the fader control circuit 1 becomes unnecessary each time the sound field control device 2 is selected to operate or not to operate.

FIG. 3 is a diagram showing a sound reproducing device according to a second embodiment of the present invention. The configuration of this drawing will be described. The sound reproducing device of this figure divides a stereo input signal (L, R) and weights the divided signals (FL-1, FR-1, RL-1, RR-
1) forming a fader control circuit 1 and signals (FL-2, FR-2, RL-) that give a spread feeling to the input signals (L, R).
2, RR-2) forming a sound field control device, and a switch section for forming signals (FL, FR, RL, RR) by selectively selecting the fader control circuit 1 and the sound reproduction circuit 2. 3 and the push button SW1 to switch the switch section, and push buttons SW2, SW3
And a control unit 4 for adjusting the weight of the divided signals of the fader 1 and adjusting the feeling of expansion of the sound field control device 2.

 Where L: stereo signal L (left) channel, R: stereo signal R (right) channel, FL: vehicle front seat stereo signal L channel, FR: vehicle front seat stereo signal R channel, RL: L channel of the stereo signal of the rear seat of the vehicle, RR: R channel of the stereo signal of the rear seat of the vehicle.

FIG. 4 is a diagram showing the configuration of the fader control circuit of FIG. This figure shows resistors 11 and 12 for dividing the L signal and R
The resistors 13 and 14 for dividing the signal and the resistors 11 and 12
And between the outputs of 13 and 14 respectively,
It includes resistors 15 and 16 which are grounded in the middle and whose points move, and drive units 17 and 18 which move the ground points of the resistors 15 and 16 by the control unit 4, respectively. The signals divided by resistors 11 and 12 and 13 and 14 by this fader control circuit 1 are the signals FL-1, RL-1, FR-1 and RR weighted by resistors 15 and 16, respectively.
-1 is formed. When the ground points of the resistors 15 and 16 move to the resistors 12 and 14 side, the volume of the front seat increases, and in the opposite case, the volume of the rear seat increases. In this way, the fader control circuit 1 balances the volume of the front and rear seats.

FIG. 5 is a diagram showing a control configuration of the drive unit shown in FIG.
The drive unit 17 (18) of this figure includes a contact portion 170 for grounding the middle of the resistor 15 (16) and an inter-terminal portion for moving the contact portion 170.
Electric drive unit 171 that receives power from XY, and power supply (+
B) Includes switch units 172 and 173 for switching the supply of voltage to the XY between the terminals by the control unit 4, and a switch unit 174 for permitting power supply. The mechanism for moving the contact portion 170 is not related to the present invention, and therefore omitted for simplification of description. In this drive unit, for example, SW2 is turned on in the control unit 3.
Then, the X terminal of the drive unit is connected to the power supply (+ B),
The switch units 172 and 173 are switched so that the Y terminal is grounded, and the switch unit 174 is turned on. When SW2 is turned off, the switch unit 174 is turned off and power supply is stopped. SW3 is O
The same applies to the case of N, but the polarity of the supplied power is reversed. As a result, the moving direction of the contact portion 170 is opposite to the above case.

FIG. 6 is a diagram showing the configuration of the sound field control device of FIG. The sound field control device 2 in this figure is a DSP (Digital Signal Proc
essor), in order to reproduce the sound field of the music venue, L
An adder 201 for adding a signal and an R signal, and the adder 201
There is an initial delay memory 202 for delaying the direct sound signal from T ₁ and T ₂ times, a delay memory 203 for receiving the direct sound signal delayed by T ₁ time, and a signal delayed by this delay memory 203. Multiple multipliers for multiplying coefficients 20
4 and, for example, the initial reflected sound generation unit 20 including a plurality of adders 205 that add the outputs of the plurality of multipliers every other one to form the right (R) and left (L) signals for stereo,
The direct sound signal of the adder 201 and the initial reflected sound generation unit 20
Of the right side (R) signal and the left side (L) signal of each of the adders 206 and 207, the delay unit 209 delaying the direct sound signal delayed by the T ₂ time by ΔT time, and the delay unit 209. 210 that multiplies a signal of a given coefficient by a coefficient, an adder 208 that adds an output signal of the multiplier 210 and an input signal of the delay unit 209, and an output signal of the delay unit 209 that is branched for a predetermined time. The reverberation generating unit 21 including a delay unit 211 that forms right (R) and left (L) signals for stereo, and each of the right (R) and left (L) signals of the reverberation generating unit 21 is multiplied by the above. Adders 212 and 213 that add the signals from the adders 206 and 207, and multipliers 214 and 215 that are respectively connected to the adders 212 and 213 and that have multiplication coefficients a and b set by the control unit 4, respectively. The FR-2 and RR-2 signals are connected to the multiplier 214, respectively. It includes multipliers 217 and 219 for forming and multipliers 216 and 218 connected to the multiplier 215 for forming FL-2 and RL-2 signals, respectively. The multipliers 216 and 217 and the multipliers 218 and 219 may be set with the multiplication coefficients c and d by the control unit 4, respectively. In order to adjust the proportion of the direct sound, the first-order reflected sound, and the reverberant sound, the control unit 4 may be provided with multipliers 220, 221, and 222 having variable coefficients.

FIG. 7 is a diagram for explaining a sound field generated by the initial delay memory, the initial reflected sound generation unit and the reverberation generation unit of FIG. As shown in the figure, the direct sound signal delayed by the initial delay memory 202 is formed into an initial reflected sound signal by the initial reflected sound generation unit 20, and further formed into an acoustic sound by the reverberation generation unit 21. The formation of the initial reflected sound signal and the reverberation sound signal reproduces different feelings of expanse in each music venue, such as a concert hall, a live house, a church, and a stadium. Further, the control unit 4 sets multiplication factors in the multipliers 208 and 209 to change the ratios of the direct sound, the initial reflected sound signal, and the reverberation sound signal.
When is turned on, the multiplication coefficient a increases, the multiplication coefficient b decreases, the direct sound and the initial reflected sound signal are enhanced with respect to the reverberation sound signal, and an image close to a stage is given. When SW3 is turned on, the reverse of the above. In this way, SW1ON or SW2
When it is ON, the listening position, that is, the position in the concert hall where the listener is listening is controlled.
Further, when the control unit 4 sets the multiplication coefficient c of the multipliers 216 and 217 to be larger than the multiplication coefficient d of the multipliers 218 and 219, the volume of the front seat increases. If this is reversed, the volume of the rear seat becomes louder.

Next, as shown in FIG. 3, the control unit 4 controls the central processing unit (CP
U) 41, ROM (Read Only Memory) 42, RAM (Random
Access memory) 43 and timer 44
SW1, SW2 and SW3 are provided.

 FIG. 8 is a diagram showing the structure of the ROM of FIG.

In the ROM 42, the multipliers 214 and 21 in the sound field control device 2 are
Initial value of the multiplication coefficient of 5,216,217,218 and 219 a ₀ = 0.5, b ₀
= 0.5, c ₀ = 0.5, d ₀ = 0.5 are stored. Further ROM42
The control program and other processing programs according to the present embodiment described later are stored in the.

 Next, a series of operations according to the second embodiment will be described.

FIG. 9 is a flowchart illustrating a series of operations for calculating the multiplication coefficients a and b according to this embodiment. In this figure,
If SW1 is turned off by the CPU 41 (step 1), initial values a ₀ = 0.5, b ₀ = 0.5, c ₀ = 0.5, d ₀ = 0.5 of the multiplication coefficients of the multipliers 214, 215, 216, 217, 218 and 219 are read from the ROM 42 (step 2). ). Next, when SW2 is turned on (step 3), the CPU 41 resets and starts the timer 44 (step 4), determines whether SW2 is turned off (step 5), and when SW2 is turned off, the timer 44 is turned on. Stops (step 6), and the CPU 41 reads the measured time of the timer 44. Initially, the CPU 41 uses the read initial value of the multiplication coefficient, for example, a = a + 1 × TX, b =
The operation of b-1 × TX is performed. For example, if the measured time of the timer 44 is 0.2, 0.4, 0.6 ... Seconds, TX = 0.1, 0.2, 0.3, and if a ≧ 1.0, b ≦ 0.0, a = 1.0, b = 0.0 (step 7). The arithmetic coefficients a, b and c ₀ , d ₀ thus obtained are set in the multipliers 214, 215, 216, 217, 218 and 219 (step 8). RAM43 for multiplication coefficients a and b
(Step 9). When SW2 is not OFF, it is judged whether or not the measurement time T of the timer 44 satisfies, for example, T <T ₁ = 2 seconds. If this judgment is “YES”, the process returns to step 5,
If "NO", proceed to step 21 (step 51). SW2
When is turned on, the coefficients a and b are read from the RAM 43 and updated by the same procedure as above. Next, when SW2 is turned off and SW3 is turned on (step 10), the timer 44 is started (step 11) and it is determined whether SW3 is turned off (step 12).
When SW3 turns off, timer 44 stops (step 1
3), CPU41 measures time of timer 44, and RAM4
The multiplication coefficients a and b are read from 3 and, for example, a = a−
The calculation of 1 × TX, b = b + 1 × TX is performed. a ≦ 0.0, b ≧
For 1.0, a = 0.0 and b = 1.0 (step 14).
The arithmetic coefficients a, b and c ₀ , d ₀ thus obtained are set in the multipliers 214, 215, 216, 217, 218 and 219 (step 15), and the multiplication coefficients a, b are stored in the RAM 43 (step 16). When SW3 is not OFF, it is judged whether or not the measured time T of the timer 44 satisfies, for example, T <T ₁ = 2 seconds. If this judgment is “YES”, the process returns to step 12, and if “NO”, the process proceeds to step 21 ( Step 52). If SW3 is turned on, RAM
From 43, the multiplication coefficients a and b are updated by repeating the above procedure.

If SW1 is ON and SW2 is ON in step 1 (step 17), the XY between the electric drive unit 171 (181) terminals of the fader 1
A positive voltage is applied to the contact portion 170 (180), for example, in the X direction during the application (step 1
8) When SW3 is turned on (step 19), a negative voltage is applied between the terminals XY of the electric drive section 171 (181) of the fader 1, and during this application, as shown in the figure, the contact section 170 (180) ) Moves in the Y direction (step 20). SW3 in steps 10 and 20
If is OFF, another process is executed (step 21).

FIG. 10 is a flowchart for explaining a series of operations for calculating the multiplication coefficients c and d according to this embodiment. In this figure,
When SW1 is turned off by the CPU 41 (step 23), the initial values of the multiplication coefficient a ₀ = 0.5, b ₀ = 0.5, c ₀ = 0.5, d _{0 are} read by the ROM 42.
= 0.5 is read (step 24). Next, when SW2 turns on (step 25), the CPU 41 resets and starts the timer 44 (step 26), judges whether SW3 turns on (step 27), and when SW2 turns on, the timer 44 stops. (Step 28), the measurement time T of the timer 44 is T <T ₀
= 0.1 second (step 29), turn on SW3 to set timer 44
Is reset and started (step 30), it is judged whether SW3 is turned off (step 31), and when SW2 is turned off, the timer
44 stops (step 32). If T ≧ T ₀ in step 29, the process ends. The measurement time is read by the CPU 41, and for example, the calculation of c = c + 1 × TY and d = d−1 × TY is performed using the initially read initial values of the multiplication coefficients. Here, for example, the measurement time of the timer 44 is 0.2, 0.4, 0.
For 6 seconds, TY = 0.1, 0.2, 0.3, and for c ≧ 1.0, d ≦ 0, c = 1.0, d = 0.0 (step 33). The arithmetic coefficients c, d and a ₀ , b ₀ thus obtained are set in the multiplier (step 34). Note that RA has already been
When a and b are obtained in M43, this may be set with priority. The multiplication coefficients c and d are stored in the RAM 43 (step 35). When SW3 is not ON, it is determined whether or not the measurement time T of the timer 44 satisfies T <T _0. If this determination is “YES”, the process returns to step 27, and if “NO”, the process ends (step 53). Furthermore, SW3 is not equal OFF, it is determined whether the measured time T of the timer 44 is T <T ₁ is satisfied, the judgment returns to step 31 if "YES", the process ends if "NO" (Step 54 ).

Next, if SW2 is OFF and SW3 is ON in step 25 (step 36), the timer 44 is reset and started (step
37), when SW2 is turned on (step 38), the timer 44 is stopped (step 39), and if the measured time T of the timer 44 is, for example, T <T ₀ = 0.1 second (step 40), then by turning on SW2. The timer 44 is reset and started (step 41).
When SW2 is turned off (step 42), the timer 44 is stopped (step 43), the measurement time is read by the CPU 41, and for example, c = c-0.1 × TY is used by using the initially read initial value of the multiplication coefficient. , d = d + 0.1 × TY is calculated. Here, for example, the measurement time of the timer 44 is 0.2, 0.4, 0.6,
If TY = 0.1, 0.2, 0.3, ..., and c = 0.0, d = 1.0 for c ≦ 0.0, d ≧ 1.0 (step 44). The arithmetic coefficients c, d, a ₀ , b ₀ thus obtained are set in the multiplier (step 45). The multiplication coefficients c and d are stored in the RAM 43 (step 46). Timer 4 when SW2 is not ON
It is determined whether the measurement time T of 4 satisfies T <T _0. If the determination is “YES”, the process returns to step 38, and if the determination is “NO”, the process ends (step 55). Furthermore, SW2 is not equal OFF, it is determined whether the measured time T of the timer 44 is T <T ₁ is satisfied, the process returns to step 38 if the determination is "YES", "NO"
If so, the process ends (step 56).

As described above, according to the second embodiment, the common SW2 and SW3 save the operation amount of the fader control circuit 1 and the arithmetic processing result of the sound field control device while maintaining the fader control circuit 1 and the sound field control device 2. The sound field control of is now possible independently.

〔The invention's effect〕

As described above, according to the present invention, the fader control circuit and the sound field control device are connected in parallel and selectively used, so that adjustment of the fader control circuit is not necessary and the fader control is performed by a common push button. Since the sound field can be controlled by the circuit and the sound field control device, erroneous operation can be prevented and the push button in the vehicle can be effectively used.

[Brief description of drawings]

FIG. 1 is a diagram showing a principle configuration of the present invention, FIG. 2 is a diagram showing a sound reproducing device according to a first embodiment of the present invention, and FIG. 3 is a sound reproducing device according to a second embodiment of the present invention. FIG. 4 is a diagram showing the apparatus, FIG. 4 is a diagram showing the configuration of the fader control circuit of FIG. 3, FIG. 5 is a diagram showing the control configuration of the drive unit of FIG. 4, and FIG. 6 is a sound field control of FIG. FIG. 7 is a diagram showing the configuration of the apparatus, FIG. 7 is a diagram illustrating a sound field generated by the initial delay memory, the initial reflected sound generation unit and the reverberation generation unit of FIG. 6, and FIG. 8 is a configuration of the ROM of FIG. FIG. 9 is a flowchart illustrating a series of operations for calculating the multiplication coefficients a and b according to the present embodiment, and FIG. 10 illustrates a series of operations for calculating the multiplication coefficients c and d according to the present embodiment. A flow chart, FIG. 11 is a diagram showing a conventional sound field control device. In the figure, 1 ... fader control circuit, 2 ... sound field control device, 3 ... switch section, 4 ... control section, SW1,2,3 ... push buttons.

Claims (3)

(57) [Claims] 1. A fader control for separating an acoustic signal from an acoustic signal source into an acoustic signal of a front channel and an acoustic signal of a rear channel, and adjusting a signal level of each of an acoustic signal of a front channel and an acoustic signal of a rear channel. A circuit (1) and a sound field control device (2) for performing a calculation process on the sound signal from the sound signal source to generate a front channel sound signal and a rear channel sound signal to form a desired sound field. A selection switch (SW1) for selecting operation / non-operation of the sound field control device (2), and an adjustment amount of each signal level of a front channel acoustic signal and a rear channel acoustic signal in the fader control circuit (1) Fader operation block (SW2, SW3)
And the sound field control device (2) is operated or deactivated based on the operation of the selection switch (SW1), and the fader control circuit (1) is operated based on the operation of the fader operation unit (SW2, SW3). ) Operating the control unit (4), the fader control circuit and the sound field control device (2),
A switch that is connected in parallel to an acoustic signal source and inputs either one of the output of the fader control circuit (1) and the output of the sound field control circuit (2) to speakers arranged in front of and behind the listener. Means (3), the switch means (3) is controlled by the control section (4), and when the operation of the sound field control circuit (2) is selected by the selection switch (SW1), The output of the sound field control circuit (2) is input to the speakers arranged in front of and behind the listener, and the selection switch (SW
When the non-operation of the sound field control circuit (2) is selected by 1), the output of the fader control circuit (1) is switched so as to be input to the speakers arranged in front of and behind the listener. A sound reproducing device characterized by being provided. 2. A control unit (4) for changing the arithmetic processing of the sound field control device (2) during operation of the sound field control device (2) depending on the operation amount of the fader operation unit. The sound reproducing device according to claim 1, further comprising: 3. The control unit (4) controls each output channel (FL-2, FR-2, RL-2, RR-2) of the sound field control device according to the operation amount of the fader operation unit. The sound reproducing device according to claim 2, wherein the signal level of the signal is controlled.