Attenuator circuit for an electronic device having a battery and method for controlling the electronic device

Patent metadata

Field	Value
Publication number	US-10637419-B2
Application number	US-201515753290-A
Country	US
Kind code	B2
Filing date	Aug 28, 2015
Priority date	Aug 28, 2015
Publication date	Apr 28, 2020
Grant date	Apr 28, 2020

Abstract

A method of controlling an electronic device having a battery and a speaker is disclosed. The method includes receiving an audio data signal, monitoring a battery-related parameter of the battery, determining whether the monitored battery-related parameter traverses a threshold, and bit-shifting the audio data signal based on the monitored battery-related parameter traversing the threshold. Also disclosed is an attenuator circuit for an electronic device having a battery.

First claim

The invention claimed is:

1. A method of controlling an electronic device with an attenuator circuit, the method comprising:
receiving an audio data signal;
monitoring a battery-related parameter of a battery of the electronic device;
determining whether the monitored battery-related parameter traverses a threshold;
attenuating the audio data signal based on the monitored battery-related parameter traversing the threshold by bit-shifting the audio data signal; and
performing an action with the electronic device when the battery-related parameter traverses a second threshold for the battery-related parameter for a first time period,
wherein determining whether the battery-related parameter traverses the threshold and attenuating the audio data signal by bit-shifting the audio signal occurs in a second time period less than the first time period.

2. The method of claim 1 , wherein the monitored battery-related parameter includes at least one parameter from the group of a battery voltage, a current associated with the battery, and a battery temperature.

3. The method of claim 1 , further comprising receiving an enable signal, wherein bit-shifting the audio data signal is further based on the enable signal.

4. The method of claim 1 , further comprising receiving a trip signal when the monitored battery-related parameter traverses the threshold, wherein bit-shifting the audio data signal is based on the trip signal.

5. The method of claim 4 , further comprising pulse-stretching the trip signal.

6. The method of claim 1 , wherein the threshold and the second threshold are the same.

7. The method of claim 1 , wherein the action includes at least one action from the group of resetting the electronic device and shutting down the electronic device.

8. The method of claim 1 , further comprising programmably adjusting the threshold.

9. The method of claim 1 , further comprising receiving a zeroized signal and grounding the audio data signal based on the received zeroized signal.

10. An attenuator circuit for an electronic device having a battery, the attenuator circuit comprising:
a sensor to monitor a battery-related parameter of the battery and to provide a sensor signal based on the battery-related parameter;
a comparator coupled to receive a reference voltage and coupled to the sensor, the comparator to provide a trip signal based on a comparison of the reference voltage and the sensor signal;
an audio data signal input to receive an audio data signal;
a bit shifter coupled to the audio data signal input and to provide an attenuated audio data signal by bit-shifting the audio data signal;
a switch coupled to the audio data signal input, the bit shifter, and the comparator, the switch to pass one of the audio data signal and the attenuated audio data signal based on the trip signal; and
an audio data signal output coupled to the switch to provide one of the audio data signal and the attenuated audio data signal.

11. The attenuator circuit of claim 10 , further comprising an AND gate receiving an enable signal and the trip signal, and the AND gate to provide a trigger signal based on the enable signal and the trip signal, wherein the bit shifter provides the attenuated audio data signal based on the trigger signal.

12. The attenuator circuit of claim 11 , wherein the audio data signal includes a word and a frame sync, and the attenuator circuit further comprises a second D flip-flop for providing word synchronization the frame sync and a third D flip-flop for detecting a most significant bit of the word.

13. The attenuator circuit of claim 10 , further comprising a pulse stretching circuit coupled to the bit shifter, the pulse stretching circuit including an OR gate and a resistor-capacitor (RC) circuit, the pulse stretching circuit controlling the bit shifter based on the trip signal.

14. The attenuator circuit of claim 10 , wherein the bit shifter includes a D flip-flop for bit shifting the audio data signal.

15. An electronic device comprising:
a battery;
the attenuator circuit of claim 10 coupled to the battery; and
a speaker coupled to the attenuator circuit.

Assignees

• Motorola Solutions Inc

Inventors

• Abdullah Mohd Faisal
• Bartels Peter J
• Bursac Marko

Classifications

• H03G7/002

  in untuned or low-frequency amplifiers, e.g. audio amplifiers (H03G7/007, H03G7/001, H03G7/008, H03G7/02, H03G7/06 take precedence) · CPC title

• G06F1/3234

  Power saving characterised by the action undertaken · CPC title

• H03G3/002

  Control of digital or coded signals (H03G3/3089 take precedence) · CPC title

• H03G7/007

  of digital or coded signals · CPC title

• H03G3/007 Primary

  Control dependent on the supply voltage · CPC title