Apparatus And Method For Frequency Detection

• US 20150110290A1
• Filed: 10/13/2014
• Published: 04/23/2015
• Est. Priority Date: 10/21/2013
• Status: Active Grant

• Current Assignee: Knowles Electronics Llc (Knowles Corporation)
• Original Assignee: Knowles Electronics Llc (Knowles Corporation)
• Inventors: Furst, Claus Erdmann, Yurttas, Aziz, Gueorguiev, Svetslav, Mortensen, Anders
• Granted Patent: US 10,028,054 B2
• Time in Patent Office: Days
• US Class Current: 381/98
• CPC Class Codes: H04R 1/04 Structural association of microphone with electric circuitry therefor in deaf-aid sets H04R25/00
• CPC Class Codes: H04R 2499/11 Transducers incorporated or for use in hand-held devices, e.g. mobile phones, PDA's, camera's
• CPC Class Codes: H04R 3/04 for correcting frequency response

Abstract

An application specific integrated circuit (ASIC) is used with an acoustic device. An input clock signal is received. The frequency of the input clock signal is determined, and the frequency is indicative of one of a plurality of operational modes of the ASIC. Based upon the determined frequency, an amount current provided to one or more operational blocks of the ASIC is changed.

Claims

1. An application specific integrated circuit (ASIC) coupled to an acoustic device, the ASIC comprising:

at least one operational block;

a frequency detection block, the frequency detection block configured to receive an input clock signal, determine the frequency of the input clock signal, the frequency indicative of one of a plurality of operational modes of the ASIC, the frequency detection block further configured to based upon the determined frequency, change an amount current provided to the at least one operational block.

2. The ASIC of claim 1, wherein the frequency detection block compares the input clock to an internally generated clock signal that runs independently of temperature and process.

3. The ASIC of claim 1, wherein the acoustic device is a micro-electro-mechanical system (MEMS) microphone.

4. The ASIC of claim 1, wherein each of the plurality of modes has a different discrete current consumption.

5. The ASIC of claim 1, wherein the modes are selected from the group consisting of a stand-by mode, a low power mode, a standard performance mode, and a high performance mode.

6. A method of operating an application specific integrated circuit (ASIC) used with an acoustic device, the method comprising:

receiving an input clock signal;

determining the frequency of the input clock signal, the frequency indicative of one of a plurality of operational modes of the ASIC;

based upon the determined frequency, changing an amount current provided to one or more operational blocks of the ASIC.

7. The method of claim 6, wherein determining the frequency comprises comparing the input clock to an internally generated clock signal that runs independently of temperature and process.

8. The method of claim 6, wherein the acoustic device is a micro-electro-mechanical system (MEMS) microphone.

9. The method of claim 6, wherein each of the plurality of operational modes has a different discrete current consumption.

10. The method of claim 6, wherein the operational modes are selected from the group consisting of a stand-by mode, a low power mode, a standard performance mode, and a high performance mode.