HOST INTERFACE, ACCESSORY INTERFACE AND METHOD FOR MANAGING A CONNECTION BETWEEN A HOST INTERFACE AND AN ACCESSORY DEVICE

• US 20170134851A1
• Filed: 06/11/2015
• Published: 05/11/2017
• Est. Priority Date: 06/26/2014
• Status: Active Grant

• Current Assignee: ams AG (Ams-Osram AG)
• Original Assignee: ams AG (Ams-Osram AG)
• Inventors: THEILER, Helmut
• Granted Patent: US 9,894,436 B2
• Time in Patent Office: Days
• CPC Class Codes: G06F 1/266 Arrangements to supply power to external peripherals either directly from the computer or under computer control, e.g. supply of power through the communication port, computer controlled power-strips
• CPC Class Codes: H01R 2107/00 Four or more poles
• CPC Class Codes: H01R 24/58 Contacts spaced along longitudinal axis of engagement
• CPC Class Codes: H03F 2200/03 the amplifier being designed for audio applications
• CPC Class Codes: H03F 3/183 with semiconductor devices only
• CPC Class Codes: H03F 3/217 Class D power amplifiers; Switching amplifiers
• CPC Class Codes: H04R 2420/01 Input selection or mixing for amplifiers or loudspeakers for hearing aids H04R25/43
• CPC Class Codes: H04R 2420/05 Detection of connection of loudspeakers or headphones to amplifiers
• CPC Class Codes: H04R 2420/09 Applications of special connectors, e.g. USB, XLR, in loudspeakers, microphones or headphones
• CPC Class Codes: H04R 29/00 Monitoring arrangements; Testing arrangements for hearing aids H04R25/30; detection of loudspeaker connection H04R5/04; sound-field adaptation dependent on speaker detection H04S7/308
• CPC Class Codes: H04R 3/00 Circuits for transducers , loudspeakers or microphones
• CPC Class Codes: H04R 5/04 Circuit arrangements, e.g. for selective connection of amplifier inputs/outputs to loudspeakers, for loudspeaker detection, or for adaptation of settings to personal preferences or hearing impairments combinations of amplifiers H03F3/68; stereophonic systems H04S

Abstract

A host interface for a media device comprises a first and a second host audio terminal for receiving a first and a second analog audio signal, a first and a second connector audio terminal for connecting a first and a second pole of a four-pole connector, and a host control circuit. The host control circuit is adapted to detect whether a device requiring a supply signal over the four-pole connector is connected. If no such device is detected, the first and the second analog audio signal are passed to the first and the second connector audio terminal. If such a device is detected, the first connector audio terminal is connected to a supply terminal.

Claims

1. A host interface for a media device, the host interface comprising

a first host audio terminal for receiving a first analog audio signal;

a second host audio terminal for receiving a second analog audio signal;

a first connector audio terminal for connecting a first pole of a four-pole connector;

a second connector audio terminal for connecting a second pole of the four-pole connector;

a connector microphone terminal for connecting a third pole of the four-pole connector, the host interface being configured to send clock information and power over the connector microphone terminal;

a data transmitter that is configured to send an encoded digital audio signal to the connector microphone terminal; and

a host control circuit that is adapted

to detect whether a device is connected that requires a supply signal over the four-pole connector and further requires a further supply signal over the four-pole connector;

if no device requiring the supply signal and/or the further supply signal is detected, to pass the first analog audio signal to the first connector audio terminal and to pass the second analog audio signal to the second connector audio terminal; and

if a device requiring the supply signal and the further supply signal is detected, to connect the first connector audio terminal to a supply terminal and to connect the second connector audio terminal to a further supply terminal.

2. The host interface according to claim 1,

wherein the supply terminal is operable to be connected to one of the following:

a supply rail of the host interface;

a voltage regulator of the host interface;

a current regulator of the host interface;

a supply rail of the media device comprising the host interface;

a voltage regulator of the media device comprising the host interface;

a current regulator of the media device comprising the host interface.

3. The host interface according to claim 1,

wherein the host control circuit is adapted, if a device requiring the supply signal and the further supply signal is detected, to generate a deactivation signal for deactivating respective audio amplifiers providing the first and the second analog audio signals.

4. The host interface according to claim 1,

wherein the host control circuit is adapted, if a device requiring the supply signal and the further supply signal is detected, to electrically disconnect the first connector audio terminal from the first host audio terminal and the second connector audio terminal from the second host audio terminal.

5. The host interface according to claim 1,

wherein the host control circuit is adapted to detect whether a device requiring the supply signal and the further supply signal is connected based on an identification signal received at the connector microphone terminal.

6. The host interface according to claim 1,

further comprising

a host microphone terminal;

and

a data receiver;

wherein

the host control circuit is adapted

to detect whether a device is connected that transmits encoded data over the connector microphone terminal;

if a device transmitting encoded data is detected, to connect the connector microphone terminal to the data receiver for decoding received encoded data; and

if no device transmitting encoded data is detected, to connect the connector microphone terminal to the host microphone terminal.

7. The host interface according to claim 1,

being configured to further transmit a host identification signal over the connector microphone terminal.

8. The host interface according to claim 1,

further comprising a common ground terminal for connecting a fourth pole of the four-pole connector, wherein the further supply terminal is formed by a power ground terminal that is separated from the common ground terminal.

9. An accessory interface for a headphone or a hands-free kit, the accessory interface comprising

a first accessory audio terminal for connecting a first pole of a four-pole connector;

a second accessory audio terminal for connecting a second pole of the four-pole connector;

an accessory microphone terminal for connecting a third pole of the four-pole connector, the accessory interface being configured to receive clock information and power over the connector microphone terminal;

a first accessory loudspeaker terminal for connecting a first loudspeaker;

a second accessory loudspeaker terminal for connecting a second loudspeaker;

a class-D amplifier with a first and a second amplifier output;

an accessory data receiver adapted to receive an encoded digital audio signal from the accessory microphone terminal for producing digital audio data for the class-D amplifier; and

an accessory control circuit that is adapted

to detect whether a media device with a host interface according to one of the preceding claims is connected at the four-pole connector;

if no such media device is detected, to connect the first accessory audio terminal to the first accessory loudspeaker terminal and the second accessory audio terminal to the second accessory loudspeaker terminal; and

if such media device is detected, to connect supply inputs of the class-D amplifier to the first and the second accessory audio terminal, to pass the digital audio data to the class-D amplifier, and to connect the first amplifier output to the first accessory loudspeaker terminal and the second amplifier output to the second accessory loudspeaker terminal.

10. The accessory interface according to claim 9, further comprising a supply extraction which is configured to generate a supply voltage or a supply current for the accessory interface from a signal at the accessory microphone terminal.

11. The accessory interface according to claim 9, further comprising a clock extraction which is configured to generate a clock signal for the accessory interface from a signal at the accessory microphone terminal.

12. The accessory interface according to claim 9,

further comprising an accessory data transmitter adapted to receive a microphone signal from a microphone of the headphone or the hands-free kit and to produce an encoded digital microphone signal thereof, wherein the accessory control circuit is adapted

to detect whether a media device is connected that is operable to process an encoded digital microphone signal;

if such media device is detected, to send the encoded digital microphone signal to the accessory microphone terminal; and

if no such media device is detected, to send an analog microphone signal to the accessory microphone terminal.

13. A method for managing a connection between a host interface for a media device and an accessory device, the method comprising:

physically connecting the host interface and the accessory device using a four-pole connector;

in the host interface, detecting whether an accessory device is connected that requires a supply signal over the four-pole connector and further requires a further supply signal over the four-pole connector;

if no accessory device requiring the supply signal and/or the further supply signal is detected, the host interface passing a first analog audio signal to a first pole of the four-pole connector and passing a second analog audio signal to a second pole of the four-pole connector;

if an accessory device requiring the supply signal and the further supply signal is detected, the host interface connecting the first pole to a supply terminal and connecting the second pole to a further supply terminal;

in the host interface, sending clock information and power over a third pole of the four-pole connector to the accessory device; and

in the host interface, sending an encoded digital audio signal over the third pole of the four-pole connector.

14. The method according to claim 13,

wherein the detection, whether an accessory device requiring the supply signal and the further supply signal is connected, is based on an identification signal received at the third pole of the four-pole connector.

15. The method according to claim 13, further comprising

in the host interface, detecting whether an accessory device is connected that transmits encoded data over the third pole of the four-pole connector;

if an accessory device transmitting encoded data is detected, the host interface passing received encoded data to a data receiver of the host interface for decoding the received encoded data; and

if no device transmitting encoded data is detected, the host interface connecting the third pole to a host microphone terminal of the host interface.

16. The method according to claim 13, further comprising

in the accessory device, producing digital audio data for a class-D amplifier included in the accessory device based on the encoded digital audio signal.

17. The method according to claim 13,

wherein a common ground terminal is connected to a fourth pole of the four-pole connector, and wherein the further supply terminal is formed by a power ground terminal that is separated from the common ground terminal.