Low-noise driver and low-noise receiver for self-mix module
First Claim
1. A system comprising:
- a laser microphone comprising;
a self-mix interferometry unit, (i) to transmit via a laser transmitter at least one outgoing laser beam towards a human speaker, and (ii) to receive an optical feedback signal reflected from the human speaker, and (iii) to generate an optical self-mix signal by self-mixing interferometry of the at least one outgoing laser beam and the received optical feedback signal;
wherein the self-mix interferometry unit comprises a laser-diode and a photo-diode;
wherein the laser-diode is associated with a laser driver TX;
wherein the photo-diode is associated with a photodiode receiver;
wherein at least one of the laser driver TX and the photodiode receiver, implements integrally a mechanism for reducing noises;
wherein the laser driver TX comprises;
a Direct Current (DC) Digital-to-Analog Converter (DAC) to generate a Direct Current (DC) having a first bandwidth;
a Modulator DAC to separately generate an Alternating Current (AC) having a second, different, bandwidth;
wherein the laser driver TX generates a drive current to the laser-diode, by utilizing (i) said Direct Current having the first bandwidth, and also (ii) said Alternating Current having the second, different, bandwidth.
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Accused Products
Abstract
Optical microphone, laser-based microphone, and laser microphone having reduced-noise components of low-noise components. A laser microphone comprises a laser-diode associated with a low-noise laser driver TX; and a photo-diode associated with a low-noise photo-diode receiver RX. The low-noise laser driver TX supplies a drive current which is a combination of a Direct Current component having a first bandwidth, and an attenuated version of an Alternating Current component having a second, different, bandwidth. Additionally or alternatively, the low-noise photo-diode receiver RX utilizes hardware-based demodulation of the analog signal, and operates to remove a Direct Current component of its output signal prior to digitization.
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Citations
24 Claims
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1. A system comprising:
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a laser microphone comprising; a self-mix interferometry unit, (i) to transmit via a laser transmitter at least one outgoing laser beam towards a human speaker, and (ii) to receive an optical feedback signal reflected from the human speaker, and (iii) to generate an optical self-mix signal by self-mixing interferometry of the at least one outgoing laser beam and the received optical feedback signal; wherein the self-mix interferometry unit comprises a laser-diode and a photo-diode; wherein the laser-diode is associated with a laser driver TX; wherein the photo-diode is associated with a photodiode receiver; wherein at least one of the laser driver TX and the photodiode receiver, implements integrally a mechanism for reducing noises; wherein the laser driver TX comprises; a Direct Current (DC) Digital-to-Analog Converter (DAC) to generate a Direct Current (DC) having a first bandwidth; a Modulator DAC to separately generate an Alternating Current (AC) having a second, different, bandwidth; wherein the laser driver TX generates a drive current to the laser-diode, by utilizing (i) said Direct Current having the first bandwidth, and also (ii) said Alternating Current having the second, different, bandwidth. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 18, 19, 20, 22, 23)
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17. A system comprising:
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a laser microphone comprising; a self-mix interferometry unit, (i) to transmit via a laser transmitter at least one outgoing laser beam towards a human speaker, and (ii) to receive an optical feedback signal reflected from the human speaker, and (iii) to generate an optical self-mix signal by self-mixing interferometry of the at least one outgoing laser beam and the received optical feedback signal; wherein the self-mix interferometry unit comprises a laser-diode and a photo-diode; wherein the laser-diode is associated with a laser driver TX; wherein the photo-diode is associated with a photodiode receiver; wherein at least one of the laser driver TX and the photodiode receiver, implements integrally a mechanism for reducing noises; wherein the photo-diode receiver comprises a Direct Current (DC) cancellation unit to remove a Direct Current component of an output signal of said photo-diode receiver. - View Dependent Claims (24)
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21. A system comprising:
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a laser microphone comprising; a self-mix interferometry unit, (i) to transmit via a laser transmitter at least one outgoing laser beam towards a human speaker, and (ii) to receive an optical feedback signal reflected from the human speaker, and (iii) to generate an optical self-mix signal by self-mixing interferometry of the at least one outgoing laser beam and the received optical feedback signal; wherein the self-mix interferometry unit comprises a laser-diode and a photo-diode; wherein the laser-diode is associated with a laser driver TX; wherein the photo-diode is associated with a photodiode receiver; wherein at least one of the laser driver TX and the photodiode receiver, implements integrally a mechanism for reducing noises; wherein the photo-diode receiver removes a Direct Current component of an output signal of said photo-diode receiver, prior to digitization of said output signal.
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Specification