SOUND SIGNAL GENERATOR TESTING APPARATUS

Abstract

A sound signal generator testing apparatus is provided. The apparatus includes a hermetic seal (2), a sound signal input unit (4), and at least a noise suppression unit (5). The sound signal input unit is for receiving sound signals transmitted from a sound signal generator (1) under testing. Each noise suppression unit includes a sound signal input unit, a low pass filter, an inverter, and an output. The sound signal input unit is for receiving sound signals. The low pass filter is for filtering the sound signals by passing the low frequencies of the sound signals that are below a predetermined value. The inverter is for inverting phases of the sound signals transmitted from the low pass filter and producing inverted sound signals. The output unit is placed behind the sound signal input unit for outputting the inverted sound signals.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an operation principle schematic diagram of a sound signal testing apparatus of a first preferred embodiment;

FIG. 2 is an operation principle schematic diagram of a sound signals testing apparatus of a second preferred embodiment; and,

FIG. 3 is an operation principle schematic diagram of a sound signals testing apparatus of a third preferred embodiment.

Claims

1. A sound signal generator testing apparatus, comprising: a hermetic seal;a sound signal input unit disposed inside of the hermetic seal and connected to a testing unit, for receiving sound signals transmitted from a sound signal generator under testing; andat least a noise suppression unit, comprising: a sound signal input unit for receiving sound signals;a low pass filter filtering the sound signals by passing the low frequencies of the sound signals that are below a predetermined value;an inverter for inverting a polarity of the filtered sound signals;an output unit being placed behind the sound signal input unit for outputting the inverted sound signals.

2. The sound signal testing apparatus as described in claim 1, wherein both of the sound receiving unit and the sound signal input unit are microphones.

3. The sound signal testing apparatus as described in claim 1, further comprising a frequency regulating unit interposed between the inverter and the output unit, for regulating frequencies of the inverted sound signals.

4. The sound signal testing apparatus as described in claim 3, further comprising a delay unit interposed between the frequency regulating unit and the output unit, for delaying the inverted sound signals for a predetermined delay time before transmitting the inverted sound signals to the output unit.

5. The sound signal testing apparatus as described in claim 4, wherein the low pass filter connects to the sound signal input unit for receiving the sound signals received by the sound signal input unit.

6. The sound signal testing apparatus as described in claim 4, wherein the low pass filter connects to a sound source for receiving the sound signals, the sound signal source being used to providing sound signals to the sound signal generator.

7. The sound signal testing apparatus as described in claim 4, wherein the hermetic seal comprises a through hole that is defined through a wall of the hermetic seal, and holds the sound signal generator therein.