JPH0735517Y2 - Audio equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention provides a volume control, a main reproduction circuit, and
The present invention relates to an audio device having a heavy bass reproduction circuit (super woofer circuit), and more particularly, to varying a reproduction band of a heavy bass component from the heavy bass reproduction circuit.

(Prior Art) For example, an audio device such as a tape recorder with a radio has a stereo reproduction circuit and a heavy bass reproduction circuit. While the stereo reproduction circuit performs stereo reproduction with the left and right main speakers, the heavy bass reproduction circuit produces a low sound. There is one that reproduces an audio signal having an enhanced range component as a deep bass component.

In this way, by adding the reproduction output of the deep bass component to the stereo reproduction, it is possible to experience a powerful sound.

(Problems to be solved by the invention) By the way, in an audio device in which a heavy bass reproduction circuit as described above is added to a stereo reproduction circuit, if the volume is conventionally increased by adjusting the reproduction volume, for example, the volume is increased. It is known that the distortion of heavy bass components tends to be emphasized accordingly. Especially the tendency is
Among the heavy bass components, it was more prominent in the lower frequency range.

Therefore, in the present invention, it is possible to reduce the sense of distortion of the deep bass component by increasing the reproduction band of the deep bass component in response to increasing the volume from low to high by operating the volume control. Has an aim.

(Means for Solving the Problem) An audio device of the present invention is a main speaker that uses a volume control for adjusting the level of an input audio signal in response to an arbitrary operation and an audio signal adjusted by the volume control. The main reproduction circuit for reproducing and outputting with, and the deep bass reproducing circuit for extracting and outputting the deep bass component from the audio signal reproduced and output by the main reproducing circuit and reproducing and outputting with the speaker for the deep bass, and the heavy bass reproducing circuit, When the volume control is operated from low volume to high volume, the playback band that changes the playback band of the deep bass component extracted from the audio signal played back and output by the main playback circuit in the higher direction in conjunction with the operation. The variable means is provided.

(Operation) When the volume volume is operated in the direction from the low volume to the high volume, the reproduction band changing means changes the reproduction band of the deep bass component in the high direction in response to the operation.

Embodiment An embodiment of the present invention will be described in detail below with reference to the drawings. In the present embodiment, the description will be made by applying it to a tape recorder with a radio as an audio device, but it can be applied to other audio devices as well.

FIG. 1 is a circuit diagram of a main part of a tape recorder with a radio to which an embodiment of the present invention is applied.

This tape recorder circuit has a changeover switch 1, a volume control 2, a main reproduction circuit 3 and a heavy bass reproduction circuit 4.

The changeover switch 1 has a tape-side contact 1a and a radio-side contact 1b. The tape-side contact 1a is used when playing a tape, and the radio-side contact 1b is used when listening to a radio broadcast.
It can be switched to. Volume volume 2
Is to be externally operated by the user when adjusting the level of the audio signal input via the changeover switch 1.

The main reproduction circuit 3 has an amplifier circuit 5 and a speaker 6. The amplifier circuit 5 amplifies the audio signal whose level is adjusted by the volume control 2, and the speaker 6 reproduces and outputs the amplified audio signal.

The deep bass reproduction circuit 4 reproduces and outputs a deep bass component from the audio signal supplied from the main reproduction circuit 3,
It has a high-pass filter 7, an amplifier circuit 8, a low-pass filter 9, an amplifier circuit 10, and a speaker 11.

The high-pass filter 7 and the low-pass filter 9 are respectively configured to be able to extract the deep bass component from the audio signal. The high pass filter 7 is a resistor
It is composed of 12, 13, a capacitor 14, and a variable resistor 15. The resistors 12 and 13 are connected in series with each other, and one end thereof is connected to the amplifier circuit 5 of the main reproducing circuit 3,
The other end is grounded. The capacitor 14 has a resistor 1 at one end.
The other end of the variable resistor 15 is connected to the connection portion of the second and the third terminals 13.

Here, the rise of the low-frequency part of the deep bass component, that is, the low-frequency cutoff frequency is determined by the time constant composed of the capacitance of the capacitor 14 and the resistance value of the variable resistor 15. In this embodiment, the volume control 2
By changing the resistance value of the variable resistor 15 in conjunction with the operation of, the low-frequency cutoff frequency can be changed to change the reproduction band of the heavy bass component.

Therefore, this variable resistor 15 is used as a reproducing band varying means.
The movable terminal 15a is adapted to interlock with the movable terminal 2a of the volume control 2, and the reproduction of the deep bass component is performed in response to the movable terminal 2a of the volume control 2 being operated in the direction from the low volume to the high volume. The band is variable in the higher direction.

More specifically, in the tape recorder circuit of this embodiment, when the volume control 2 is adjusted to the minimum, medium, and maximum volume, the reproduction band of the deep bass reproduction circuit 4 is as shown in FIG. The movable terminal 15a of the variable resistor 15 changes in association with the movable terminal 2a of the volume control 2 so that the variable resistance 15 becomes I, II, and III.

As a result, the reproduction band of the deep bass component changes from I to III in FIG. 2 as the volume increases from the minimum to the maximum by the volume volume 2 adjustment operation.
The distortion feeling of the deep bass, which becomes noticeable at a high volume, is suppressed.

(Effect of the Invention) As is apparent from the above description, according to the present invention,
By changing the volume from low to high by operating the volume control, the playback range of the deep bass component is increased.
It is possible to suppress the sense of distortion of the deep bass component.

[Brief description of drawings]

FIG. 1 is a circuit diagram of a main part of a tape recorder with a radio to which an embodiment of the present invention is applied, and FIG. 2 is a diagram showing a reproduction band characteristic of a heavy bass reproduction circuit. 2 ... Volume volume, 3 ... Main reproduction circuit, 4 ... Heavy bass reproduction circuit, 7 ... High-pass filter, 15 ... Variable resistor (reproduction band variable means).

Claims (1)

[Scope of utility model registration request] 1. A volume control (2) for adjusting the level of an input audio signal according to an arbitrary operation, and an audio signal whose level is adjusted by the volume control (2) is reproduced by a main speaker (6). A main reproduction circuit (3) for outputting and a heavy bass reproduction circuit (4) for extracting a heavy bass component from an audio signal reproduced and output by the main reproduction circuit (3) and reproducing and outputting it by a speaker (11) for heavy bass. And a deep bass reproduction circuit (4) is provided with a volume control (2)
When the volume is operated from low to high, the playback is performed by changing the playback band of the deep bass component extracted from the audio signal played back and output by the main playback circuit (3) in a higher direction in synchronization with the operation. An acoustic device having a band varying means (15).