US 11,720,318 B2
Audio accessory with high and low impedance paths to a speaker, and a radio for the audio accessory
Joo Yih See, Penang (MY); Daniel Grobe Sachs, Chicago, IL (US); Heng Leong Leong, Penang (MY); Robert A. Zurek, Chicago, IL (US); and Sheau Wei Ch'Ng, Penang (MY)
Assigned to MOTOROLA SOLUTIONS, INC., Chicago, IL (US)
Filed by MOTOROLA SOLUTIONS, INC., Chicago, IL (US)
Filed on Dec. 17, 2021, as Appl. No. 17/554,441.
Prior Publication US 2023/0195408 A1, Jun. 22, 2023
Int. Cl. G06F 3/16 (2006.01); G08C 17/02 (2006.01); H03F 3/183 (2006.01); H04R 3/00 (2006.01)
CPC G06F 3/162 (2013.01) [G08C 17/02 (2013.01); H03F 3/183 (2013.01); H04R 3/00 (2013.01); H03F 2200/03 (2013.01); H04R 2420/03 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An audio accessory for a radio, the audio accessory comprising:
a speaker;
an audio interface to connect to a respective audio interface of the radio;
a switching circuit located between the audio interface and the speaker, the switching circuit comprising:
a high impedance path between the audio interface and the speaker;
a low impedance path between the audio interface and the speaker; and
a switch to connect the audio interface to the speaker via one of the high impedance path or the low impedance path, the switch initially connecting the audio interface to the speaker via the high impedance path;
a first data interface to connect to a respective first data interface of the radio; and
a controller configured to:
receive, via the first data interface, from the radio, a message to control the switch to connect the audio interface to the speaker via the low impedance path; and
in response to receiving the message, control the switch to connect the audio interface to the speaker via the low impedance path.