Device for transforming a digital signal into an acoustic one, and that makes use of a standard phase modulation

• US 20060147037A1
• Filed: 04/10/2003
• Published: 07/06/2006
• Est. Priority Date: 02/07/2003
• Status: Active Grant

• Current Assignee: Paolo Sacco Boschetti
• Original Assignee: Paolo Sacco Boschetti
• Inventors: Boschetti, Paolo Sacco
• Granted Patent: US 7,394,899 B2
• Time in Patent Office: Days
• US Class Current: 379/444
• CPC Class Codes: H04B 11/00 Transmission systems employing sonic, ultrasonic or infrasonic waves
• CPC Class Codes: H04L 27/18 Phase-modulated carrier systems, i.e. using phase-shift keying H04L27/32 takes precedence

Abstract

A device for transforming a digital signal into an acoustic signal, making use of a standard phase modulation, that comprises a modem chip (1) with a phase modulation of known kind, used until now for the data transmission via cable, conceived and used only for a cable connection, for acquiring a digital signal through a serial inlet RS232 and for modulating the same according to a standard record V.22, and an acoustic transducer (2) of the piezoelectric kind guided by the modem chip (1).

Claims

1. A device for transforming a digital signal into an acoustic signal, making use of a standard phase modulation, characterized in:

a modem chip (1) with a phase modulation of known kind, used until now for the data transmission via cable, conceived and used only for a cable connection, for acquiring a digital signal through a serial inlet RS232 and for modulating the same according to a standard record V.22;

an acoustic transducer (2) of the piezoelectric kind guided by said modem chip (1);

a feeding and connecting circuit, and making use of a standard phase modulation instead of the frequency modulation commonly used for the data transmission of acoustic kind.

2. A device according to claim 1, characterized in that it makes use of the phase modulation of the signal and due to the high efficiency that may be obtained by the latter, guiding an extremely simple acoustic transducer (piezoelectric buzzer) at very low power (in terms of one micro-watt), instead of a more expensive loudspeaker of the electromagnetic kind.

3. A device according to claim 1, characterized in a reliable data transmission through a telephone line under the following acoustic coupling, where no other similar data transmission device would succeed:

the transducer and the microphone are physically far away, until a distance of one meter;

the transducer and the microphone are not aligned (within a distance of one meter);

the orientation of the operation fields of the transducer and of the microphone is diverging, as—

e.g.—

in the situation in which they are both resting on a plane with opposed orientation.