Playing device and playing method based on playing device

Patent metadata

Field	Value
Publication number	US-11166103-B2
Application number	US-201816651340-A
Country	US
Kind code	B2
Filing date	Sep 25, 2018
Priority date	Sep 26, 2017
Publication date	Nov 2, 2021
Grant date	Nov 2, 2021

Abstract

The present disclosure provides a playing device and a playing method based on the playing device. The playing device includes a headphone interface circuit and a speaker circuit. Signal input terminals of the headphone interface circuit and the speaker circuit are directly connected to a sound source output terminal of the playing device. The signal input terminal of the speaker circuit is connected to a first enable signal output terminal when the first enable signal output terminal outputs a matched enable signal, a sound source signal output from the sound source output terminal is played by the speaker circuit. The signal input terminal of the headphone interface circuit is connected to a second enable signal output terminal. When a headphone is inserted and the second enable signal output terminal outputs a matched enable signal, a sound source signal output from the sound source output terminal is played by the headphone.

First claim

What is claimed is:

1. A playing device, comprising a headphone interface circuit and a speaker circuit;
wherein a signal input terminal of the headphone interface circuit and a signal input terminal of the speaker circuit are directly connected to a sound source output terminal of the playing device;
the speaker circuit is further connected to a first enable signal output terminal of the playing device; and when the first enable signal output terminal outputs a matched enable signal, a sound source signal output from the sound source output terminal is played by the speaker circuit;
the headphone interface circuit is further connected to a second enable signal output terminal of the playing device; and when a headphone is inserted and the second enable signal output terminal outputs a matched enable signal, a sound source signal output from the sound source output terminal is played by the headphone; the headphone interface circuit comprises a first switching circuit, a second switching circuit, and a control circuit; an input terminal of the first switching circuit is connected to a left channel output terminal of the sound source output terminal; and an input terminal of the second switching circuit is connected to a right channel output terminal of the sound source output terminal; an output terminal of the first switching circuit is connected to a left channel signal output terminal of the headphone interface circuit; an output terminal of the second switching circuit is connected to a right channel signal output terminal of the headphone interface circuit; a control terminal of the first switching circuit and a control terminal of the second switching circuit are connected to the control circuit; the control circuit is further connected to the second enable signal output terminal; and when a headphone is inserted and the second enable signal output terminal outputs a matched enable signal, the control circuit controls the first switching circuit and the second switching circuit to turned on, and a sound source signal output from the sound source output terminal is played by the headphone;
the first switching circuit comprises one switching device or a plurality of switching devices connected in series;
the second switching circuit comprises one switching device or a plurality of switching devices connected in series; the headphone interface circuit further comprises a first resistor and a second resistor; the first resistor is connected in parallel with the first switching circuit; and the second resistor is connected in parallel with the second switching circuit.

2. The playing device claimed as in claim 1 , wherein
the first switching circuit further comprises a first capacitor and a third resistor; one end of the third resistor is connected to the left channel output terminal of the sound source output terminal; the other end of the third resistor is connected to one end of the first capacitor; and the other end of the first capacitor is connected to the control circuit;
the second switching circuit further comprises a second capacitor and a fourth resistor; one end of the fourth resistor is connected to the right channel output terminal of the sound source output terminal; the other end of the fourth resistor is connected to one end of the second capacitor; and the other end of the second capacitor is connected to the control circuit.

3. The playing device claimed as in claim 1 , wherein
the speaker circuit further comprises a power amplifier; an input terminal of the power amplifier is connected to the sound source output terminal and the first enable signal output terminal; and an output terminal of the power amplifier is connected to a speaker in the speaker circuit;
a resistance value of the first resistor and a resistance value of the second resistor are determined by the following formula (1);

R
=

(

V

r
⁢
m
⁢
s
⁢
1

V

rms
⁢

⁢
2

-
1

)

*

R
2

(
1
)

wherein, R is the resistance value of the first resistor or the resistance value of the second resistor, and V rms1 is an effective voltage value of the sound source signal received by the power amplifier;
V rms2 is an effective voltage value of the sound source signal through the transmission branch formed by the respective first resistor or second resistor, received by a headphone; and R 2 is an impedance value of the headphone.

4. The playing device claimed as in claim 2 , wherein
a resistance value of the third resistor and a resistance value of the fourth resistor are in a range of 3K to 10K ohm.

5. The playing device claimed as in claim 2 , wherein
the control circuit comprises a first switching device and a second switching device; and a control terminal of the first switching device and a control terminal of the second switching device is connected to the second enable signal output terminal;
an input terminal of the first switching device is respectively connected to the first capacitor and a control terminal of the first switching circuit; an input terminal of the second switching device is respectively connected to the second capacitor and a control terminal of the second switch; and an output terminal of the first switching device and an output terminal of the second switching device are respectively grounded.

6. The playing device claimed as in claim 5 , wherein
the control circuit further comprises a fifth resistor; one end of the fifth resistor is connected to the output terminal of the first switching device and the output terminal of the second switching device; and the other end of the fifth resistor is grounded.

7. A playing method based on a playing device, wherein
the playing device comprises a headphone interface circuit and a speaker circuit; a signal input terminal of the headphone interface circuit and a signal input terminal of the speaker circuit are directly connected to a sound source output terminal of the playing device; the speaker circuit is further connected to a first enable signal output terminal of the playing device; and the headphone interface circuit is further connected to a second enable signal output terminal of the playing device;
the playing method comprises:
detecting by the pl

Assignees

• Huizhou Tcl Mobile Communication Co Ltd

Inventors

• Yao Min
• Liu Mingliang
• Yan Chunxia

Classifications

• H04R2420/05

  Detection of connection of loudspeakers or headphones to amplifiers · CPC title

• H04R2420/03

  Connection circuits to selectively connect loudspeakers or headphones to amplifiers · CPC title

• H04R5/033

  Headphones for stereophonic communication {(details thereof, e.g. relating to batteries, cables or control elements H04R1/10)} · CPC title

• H04R1/20 Primary

  Arrangements for obtaining desired frequency or directional characteristics (for stereophonic purpose H04R5/00) · CPC title

• H04R1/1041

  Mechanical or electronic switches, or control elements (switches in general H01H) · CPC title