Audio and USB multiplexing
First Claim
1. An analog/digital switching circuit for connecting a primary device to a peripheral device, the primary device comprising a primary USB connector, a power/audio manager and at least one primary listening device, and the peripheral device comprising a peripheral USB connector and at least one peripheral listening device comprising:
- first and second data signal lines connected to the power/audio manager, for transmitting respective first and second data signals;
first and second audio signal lines for transmitting respective first and second audio signals generated by the power/audio manager to the at least one primary listening device or the at least one peripheral listening device;
first and second primary USB signal lines connected to the primary USB connector, for transmitting respective first and second USB signals;
first and second peripheral USB signal lines connected to the peripheral USB connector and to the respective first and second primary USB signal lines;
a USB detection line connected to the power/audio manager, to the primary USB connector and to the peripheral USB connector, for detecting a USB charger attached to the primary USB connector or to the peripheral USB connector;
a first switch for multiplexing the first USB signal to the first data signal or the first audio signal;
a second switch for multiplexing the second USB signal to the second data signal or the second audio signal; and
configuration detection circuitry for detecting, based on states of said first and second switches, each of the following configurations;
(c1) primary device not connected to peripheral device, audio not to be output to a primary listening device, USB charger not connected to primary device;
(c2) primary device not connected to peripheral device, audio is to be output to a primary listening device, USB charger not connected to primary device;
(c3) primary device not connected to peripheral device, audio not to be output to a primary listening device, USB charger is connected to primary device;
(c4) primary device not connected to peripheral device, audio is to be output to a primary listening device, USB charger is connected to primary device;
(c5) primary device is connected to peripheral device, audio not to be output to a peripheral listening device, USB charger not connected to peripheral device;
(c6) primary device is connected to peripheral device, audio is to be output to a peripheral listening device, USB charger not connected to peripheral device;
(c7) primary device is connected to peripheral device, audio not to be output to a peripheral listening device, USB charger is connected to peripheral device; and
(c8) primary device is connected to peripheral device, audio is to be output to a peripheral listening device, USB charger is connected to peripheral device.
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Accused Products
Abstract
An analog/digital switching circuit for connecting a primary electronic device to a peripheral electronic device, including D+ and D− signal lines connected to a primary electronic device, a first analog/digital switch connected to the D+ signal line, for multiplexing an input D+ signal to an output USB data signal or audio left or right signal, the multiplexed signal feeding into a peripheral device connector for connecting the primary device to a peripheral electronic device, a second analog/digital switch connected to the D− signal line, for multiplexing an input D− signal to an output USB data signal or audio right or left signal, the multiplexed signal feeding into the peripheral device connector, a headset left signal line connected to the primary device and to the output audio left signal of the first analog/digital switch, a headset right signal line connected to the primary device and to the output audio right signal of the second analog/digital switch, a first USB signal line connected to a USB connector and to the output USB data signal of the first analog/digital switch, a second USB signal line connected to the USB connector and to the output USB data signal of the second analog/digital switch, and an amplifier that amplifies the output audio left signal and the output audio right signal at gain levels appropriate for (i) a headset connected to the primary device, (ii) a speaker connected to the peripheral device, and (iii) an earpiece connected to the peripheral device.
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Citations
10 Claims
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1. An analog/digital switching circuit for connecting a primary device to a peripheral device, the primary device comprising a primary USB connector, a power/audio manager and at least one primary listening device, and the peripheral device comprising a peripheral USB connector and at least one peripheral listening device comprising:
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first and second data signal lines connected to the power/audio manager, for transmitting respective first and second data signals; first and second audio signal lines for transmitting respective first and second audio signals generated by the power/audio manager to the at least one primary listening device or the at least one peripheral listening device; first and second primary USB signal lines connected to the primary USB connector, for transmitting respective first and second USB signals; first and second peripheral USB signal lines connected to the peripheral USB connector and to the respective first and second primary USB signal lines; a USB detection line connected to the power/audio manager, to the primary USB connector and to the peripheral USB connector, for detecting a USB charger attached to the primary USB connector or to the peripheral USB connector; a first switch for multiplexing the first USB signal to the first data signal or the first audio signal; a second switch for multiplexing the second USB signal to the second data signal or the second audio signal; and configuration detection circuitry for detecting, based on states of said first and second switches, each of the following configurations; (c1) primary device not connected to peripheral device, audio not to be output to a primary listening device, USB charger not connected to primary device; (c2) primary device not connected to peripheral device, audio is to be output to a primary listening device, USB charger not connected to primary device; (c3) primary device not connected to peripheral device, audio not to be output to a primary listening device, USB charger is connected to primary device; (c4) primary device not connected to peripheral device, audio is to be output to a primary listening device, USB charger is connected to primary device; (c5) primary device is connected to peripheral device, audio not to be output to a peripheral listening device, USB charger not connected to peripheral device; (c6) primary device is connected to peripheral device, audio is to be output to a peripheral listening device, USB charger not connected to peripheral device; (c7) primary device is connected to peripheral device, audio not to be output to a peripheral listening device, USB charger is connected to peripheral device; and (c8) primary device is connected to peripheral device, audio is to be output to a peripheral listening device, USB charger is connected to peripheral device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification