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Volume and tone control in direct digital speakers

A digital loudspeaker and volume control technology, applied in frequency/direction characteristic devices, frequency response correction, etc., can solve problems such as peak-to-peak amplitude reduction

Active Publication Date: 2013-02-13
AUDIO PIXELS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0043] Despite the specified 12 dB / octave frequency response, the analog loudspeaker also exhibits a flat response due to the inherent nature of the analog loudspeaker according to which an increase in the frequency f causes a decrease in the peak-to-peak amplitude A

Method used

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  • Volume and tone control in direct digital speakers
  • Volume and tone control in direct digital speakers
  • Volume and tone control in direct digital speakers

Examples

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example 1

[0352] Example 1: It would be desirable to make a cell phone speaker that is very small, low cost, and loud enough to hear a ringing sound in the next room, but of mediocre sound quality. The desired small size and low cost require loudspeakers to have a relatively small area, e.g. a maximum of 300mm 2 . This requires a large displacement if a relatively high target maximum loudness is desired, eg 90 dB SPL. Acceptable levels of distortion (10%) and dynamic range (60 dB) in a cell phone speaker require a minimum array size of 1000 elements (using M=10 (60 / 20) calculate). Thus, a suitable loudspeaker may include 1023 moving elements divided into 10 binary groups, each element occupying approximately 0.3mm 2 area. The cell size will therefore be about 550 μm x 550 μm.

[0353] For practical reasons, the largest moving element that fits into this space may have a diameter of 450 μm. A reasonable displacement of such a moving element may be around 150 μm PTP (peak-to-peak), ...

example 2

[0354] Example 2: It is desirable to make high fidelity headphones that have very high sound quality (the highest possible) and very low noise, yet are small enough to be comfortable to wear, and finally, are as cost-effective as possible benefit.

[0355] For high sound quality, wide dynamic range (at least 96dB), wide frequency range (20Hz-20KHz) and very low distortion (2 unit, so that 65535 components fit into a 2621mm 2 , for example in an area of ​​52mm×52mm. The sampling rate is generally at least twice the highest frequency you want the speaker to produce, or 40KHz. The closest standard sampling rate is 44.1KHz.

example 3

[0356] Example 3: It may be desirable to make public address loudspeakers, for example for dance halls, which are very loud, have a wide frequency range, extending to very low frequencies, and have low distortion. Therefore, PA (Public Address) loudspeakers typically have many large moving elements. A 600 μm movable element can be used, which is capable of a displacement of 200 μm PTP. Such a component occupies 750μm x 750μm or 0.5625mm 2 unit. Due to low frequency requirements a minimum of 262143 active elements divided into 18 binary groups can be used. The dimensions of the loudspeaker may be approximately 40cm x 40cm. This loudspeaker typically reaches a maximum loudness level of 120dB SPL and extends down to 15Hz.

[0357] Reference is now generally made to FIGS. 20-23, which depict preferred systems for use with direct digital loudspeakers, such as here at Figure 1A-19 any of the loudspeakers shown in , or such as a conventional direct digital loudspeaker as may be...

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Abstract

Actuator apparatus for generating a physical effect, at least one attribute of which corresponds to at least one characteristic of a digital input signal sampled periodically in accordance with a clock, the apparatus comprising at least one array of moving elements each constrained to travel alternately back and forth along a respective axis in response to an alternating electromagnetic force applied to the array of moving elements, at least one latch operative to selectively latch at least one subset of said moving elements in at least one latching position thereby to prevent the individual moving elements from responding to the electromagnetic force, an electromagnetic field control system operative to receive the clock and, accordingly, to control application of the electromagnetic force to the array of moving elements, and a latch controller operative to receive the digital input signal and to control the latch accordingly.

Description

[0001] REFERENCE TO CO-PENDING APPLICATIONS [0002] Priority is claimed from U.S. Provisional Application No. 60 / 802,126, filed May 22, 2006, entitled "Anapparatus for generating pressure," and filed December 4, 2006, entitled "Volume Control" U.S. Provisional Application No. 60 / 872,488, filed April 2, 2007, and U.S. Provisional Application No. 60 / 907,450, filed April 2, 2007, entitled "Apparatus for generating pressure and methods of manufacture therefore," and filed May 3, 2007, US Provisional Application No. 60 / 924,203, entitled "Apparatus and Methods for Generating Pressure Waves." field of invention [0003] The present invention relates generally to volume control for speakers, and more particularly to volume control for direct digital speakers. Background of the invention [0004] The state of the art for actuators including microactuator arrays is considered to be represented by the following, all of which are US patent documents unless otherwise stated: [0005]...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04R1/22H04R3/04
Inventor 尤沃·科恩丹尼尔·勒温莎伊·卡普兰
Owner AUDIO PIXELS
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