US 2017/0374472 A1 · MAGNETORESISTIVE AUDIO PICKUP

Abstract

A magnetoresistive audio pickup comprises an audio detection circuit. The audio detection circuit comprises at least one linear magnetoresistive sensor, a coupling capacitance, an AC amplifier, and a signal processing circuit comprising an additional amplifier. The linear magnetoresistive sensor comprises at least one single-axis linear magnetoresistive sensor unit. The linear magnetoresistive sensors are placed in a measurement plane above a speaker's voice coil, the signal output end of each single-axis linear magnetoresistive sensor unit is capacitively coupled to the AC amplifier which provides AC signals through electrical connection to the amplifier, these signals are combined within the signal processing unit into an audio signal, and the audio signal is output from the circuit; each single-axis linear sensor unit is located in the linear response area of the measurement plane. The present invention detects a speaker's audio signals via magnetic field coupling between a speaker and a linear magnetoresistive sensor. The magnetoresistive audio pickup's structure is simple and it also provides low power consumption.

Claims20

Dependent claims

A magnetoresistive audio pickup for converting an electromagnetic signal of a speaker to an audio signal, the speaker having a measurement plane above a voice coil surface, and the measurement plane having a single component working area thereon;

the single component working area being an intersection formed by a linear magnetic field measurement area, an AC magnetic field measurement area and a SNR measurement area on the measurement plane, the magnetoresistive audio pickup comprising:
an audio pickup circuit including at least one linear magnetoresistive sensor, a coupling capacitor, an AC amplifier, an amplifier and a signal processing circuit, the linear magnetoresistive sensor including at least one single-axis linear magnetoresistive sensor unit to sense signals from the linear magnetic field measurement area;
the at least one single-axis linear magnetoresistive sensor unit having a power input end and a separate signal output end, wherein the signal output end is connected to the AC amplifier via the coupling capacitor to output AC signals, and connected to the amplifier to combine these signals into one signal that is outputted as an audio signal via the signal processing circuit.

Dependencies are inferred from the claim text.

Magnetoresistive audio pickup

Life of this patent

Magnetoresistive audio pickup

Life of this patent

Abstract

Claims20