JPS6345111Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an audio device incorporating a speaker.

Conventionally, speakers built into small-sized audio equipment are usually built into the top or side of a unit case so as to face upward or forward. In such audio equipment units, the bare characteristics of the built-in speakers are emitted as they are, so it has been difficult to obtain good acoustic characteristics unless expensive speakers with good characteristics are used.

Especially when a microphone is installed close to the speaker in addition to the unit,
There was a drawback that the sound from the speaker was easily transmitted to the microphone, causing howling. However, the frequency versus output sound pressure characteristics of a speaker are affected not only by the speaker, but also by the unit case and the environment where it is used, and with small acoustic units it may not be possible to secure the internal space necessary to improve the characteristics. many.

This invention provides an audio device that can easily improve the speaker characteristics of the above-mentioned compact audio unit.

An embodiment of this invention will be described below with reference to the drawings, taking a conference loudspeaker unit as an example.

First, as shown in Figure 3, the conference loudspeaker unit is placed on each conferee's table, which is hung on a chair.
It is installed at a distance of approximately 1 meter, and has an amplifier built into the unit case, and a microphone on the front side of the case facing the meeting participants, as well as operation buttons and display parts for requesting to speak, speaking, priority, etc. is attached and connected to the center equipment via a connector provided on the back of the case. The speaker is attached to the case facing upward or on the front side.

In this invention, one end of the unit case 1 as described above is bent obliquely upward, and the speaker 3 is mounted obliquely downward on the inside of the oblique bottom of the bent portion 2, and the front end surface 4 is bent obliquely upward.
It is equipped with a microphone 5, various operation buttons 6, and a display device 7. In the figure, reference numeral 8 indicates a connector for connecting to the center equipment, and reference numeral 9 indicates a cushioning rubber piece fixed to the bottom of the case.

When the unit configured as described above is used by placing it on a tabletop, the vibrations of the speaker 3, which is mounted diagonally downward, will be reflected on the tabletop as shown in Figure 3, and the direction of reflection will be on the surface perpendicular to the speaker 3. Since the direction is almost parallel to the direction of the microphone, the tendency for howling to occur is significantly reduced. Furthermore, as the vibrations are reflected off the tabletop, the reflectivity of the highly directional high-frequency range is lower than that of the low-frequency range, which suppresses high-frequency sounds that are likely to cause howling.
This has the effect of reducing interference and improving sound quality. In addition, the microphone 5, operation button 6, and display device 7 are oriented diagonally upward as shown in FIG. 3, the microphone 5 is facing the speaking direction of the conferee, and the operation button 6 and display device are also oriented at an angle that is easy to handle and view. Since the tabletop is used as a reflective surface, there is no need to provide a special reflective surface.

In Fig. 4, the bending angle of the case bending part 2 is 45°,
Measurements were taken under the same conditions using a 0.1W input speaker, and the unit case 1 according to this invention was normally placed on a tabletop as shown in A in the figure, and the case B in the figure was measured under the same conditions.
The frequency-sound pressure characteristics are shown when the bent portion 2 is facing upward.

As is clear from the above characteristics, characteristic curve B is a curve that is close to the bare characteristics of a speaker with sharp peaks and dips, whereas characteristic curve A that has been used normally has a higher pitch than curve B over several hundred to 2KHz. The pressure has increased, the peak has decreased around 4KHz, and the overall characteristics have been significantly improved.

This is because the vibration of the speaker is reflected on the tabletop, so when the directivity is low, the direct sound and reflected sound due to the vibration are synthesized, increasing the sound pressure, and in the high range, the directivity becomes sharp, so only the reflected sound remains. It is thought that the sound pressure decreases due to large attenuation due to reflection.
The sound pressure reduction in the above-mentioned high range is effective in preventing howling. Furthermore, the bending angle of the bent portion 2 was measured in the range of 10° to 60°, and in this case also results similar to the above measurement results were obtained.

This invention requires that the speaker be attached to the bent part of the case facing downward and the microphone be attached to the front end of the bent part, and in addition to the conference loudspeaker unit described in the example, an interphone for simultaneous calls, and a loudspeaker telephone set. The present invention can be applied to various types of audio equipment incorporating external speakers of small loudspeaker units.

[Brief explanation of drawings]

FIG. 1 is a sectional side view of the unit case according to this invention, FIG. 2 is a front view, FIG. 3 is a side view of the unit case in use, and FIG. 4 is a frequency-sound pressure characteristic curve. 1... Case, 2... Bent part, 3... Speaker, 5... Microphone.

Claims (1)

[Scope of utility model registration request] This audio device incorporates a speaker and a microphone, characterized in that one end of the device case is bent obliquely upward, a speaker is attached facing downward and forward on the inside of the bottom of the bent portion, and a microphone is attached to the front end surface of the bent portion.