MICROPHONE CIRCUIT

• US 20100054494A1
• Filed: 12/31/2008
• Published: 03/04/2010
• Est. Priority Date: 08/28/2008
• Status: Active Grant

• Current Assignee: Chi Mei Communication Systems Incorporated (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Chi Mei Communication Systems Incorporated (Hon Hai Precision Industry Co., Ltd.)
• Inventors: CHEN, YANG-YU
• Granted Patent: US 8,189,815 B2
• Time in Patent Office: Days
• US Class Current: 381/92
• CPC Class Codes: H04R 3/00 Circuits for transducers , loudspeakers or microphones

Abstract

A microphone circuit includes a signal generating module, a filtering module, a transmitting module and a switch module. The signal generating module transforms audio signals into electronic signals. The filtering module is connected to the signal generating module to filter the electronic signals sent from the signal generating module. The transmitting module is connected to the filtering module to transmit the signals sent from the filtering module. The switch module is connected to the signal generating module to selectively regulate the microphone circuit to function as a differential microphone circuit or a single-ended microphone circuit.

Claims

1. A microphone circuit, comprising:

a signal generating module transforming audio signals into electronic signals;

a filtering module connected to the signal generating module to filter the electronic signals;

a transmitting module connected to the filtering module to transmit the filtered electronic signals to a broadcaster; and

a switch module connected to the signal generating module to allow both a forward electronic signal and a reverse electronic signal to be sent to the filtering module or only the forward electronic signal to be sent to the filtering module to selectively regulate the microphone circuit to function as a differential microphone circuit or a single-ended microphone circuit.

2. The microphone circuit as claimed in claim 1, wherein the microphone circuit is fabricated as a single chip.

3. The microphone circuit as claimed in claim 1, further comprising a power supply connected to the signal generating module to supply power to the microphone circuit.

4. The microphone circuit as claimed in claim 3, wherein the signal generating module includes a signal generator having a first connector transmitting the forward electronic signals, a second connector transmitting the reverse electronic signals, and a third connector grounded or functioning as a gain control connector.

5. The microphone circuit as claimed in claim 4, wherein the signal generating module further includes a first resistor, a second resistor, and a capacitor connected in series.

6. The microphone circuit as claimed in claim 5, wherein the resistance of the first resistor is about 0 ohms.

7. The microphone circuit as claimed in claim 5, wherein the capacitor has one pole connected to the second resistor and another pole grounded, and the third connector is connected between the first resistor and the second resistor.

8. The microphone circuit as claimed in claim 5, wherein the switch module includes a first switch connected between the second connector and the first resistor, such that the first resistor and the second resistor are connected in series between the first switch and the capacitor.

9. The microphone circuit as claimed in claim 8, wherein the switch module further includes a second switch having one end connected between the first resistor and the second resistor and another end grounded.

10. The microphone circuit as claimed in claim 4, wherein the signal generator further includes a fourth connector connected to the power supply and a fifth connector grounded.

11. The microphone circuit as claimed in claim 4, wherein the signal generator further includes a sound receiving hole defined therein to receive the audio signals.

12. The microphone circuit as claimed in claim 1, wherein the microphone circuit is formed by a single-ended microphone circuit and a differential microphone circuit integrated together.

13. The microphone circuit as claimed in claim 12, wherein the single-ended microphone circuit and the differential microphone circuit are integrated on a same chip using surface mounted technology (SMT).