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The innovation of touch-tone telephony revolutionized the telecommunications industry by replacing the traditional rotary dial with a dual-tone multi-frequency (DTMF) signaling system. This system uses a matrix-style keypad with buttons arranged in four rows and three columns, creating 12 distinct signals each assigned to a pair of frequencies. Each button press results in a simultaneous generation of two sinusoidal tones – one from a low-frequency group (697 to 941 Hz) and one from a...
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Passive filters are utilized to shape the frequency spectrum of signals across a diverse array of applications. These filters, using only passive elements like resistors (R), inductors (L), and capacitors (C), are capable of selectively allowing or blocking certain frequency ranges without the need for external power sources.
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A Critical Step to Using a Parametric Array Loudspeaker in Mobile Devices.

Hongmin Ahn1, Kyounghun Been2, In-Dong Kim3

  • 1Department of Mechanical Engineering, POSTECH, Pohang 37673, Korea. idealcircuit@postech.ac.kr.

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PubMed
Summary
This summary is machine-generated.

Researchers developed a compact parametric array loudspeaker system for mobile devices, overcoming power and size limitations. This innovation enables highly directional audio from battery-powered devices.

Keywords:
directional speakerparametric arraypiezoelectric micro-machined ultrasonic transducer

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Area of Science:

  • Acoustics
  • Electrical Engineering
  • Mobile Device Technology

Background:

  • Parametric array (PA) loudspeakers offer high directivity but are typically large and power-hungry.
  • Conventional PA systems are unsuitable for mobile devices due to size and battery power constraints.

Purpose of the Study:

  • To design and fabricate a compact PA loudspeaker system (PALS) suitable for mobile device integration.
  • To demonstrate that the challenges of power consumption and device size can be overcome for mobile PA applications.

Main Methods:

  • Designed and constructed a power amplifier and signal-processing unit for the PALS.
  • Developed a PA source transducer specifically for mobile device applications.
  • Integrated all components into a single PALS and evaluated its performance in a semi-anechoic chamber.

Main Results:

  • The PALS generated a primary wave of 125 dB and a different frequency wave (DFW) of 62 dB at 0.45 m.
  • Achieved a half-power beamwidth (HPBW) of 6° at 83 kHz (DFW) and 90 kHz (primary wave).
  • Demonstrated low power consumption: 6.65 W without a matching circuit and 3.25 W with a matching circuit.

Conclusions:

  • The fabricated PALS successfully addresses the limitations of conventional PA systems for mobile applications.
  • The developed system is compact and energy-efficient, making it viable for battery-powered mobile devices.
  • The PALS technology opens possibilities for highly directional audio experiences on the go.