Audio system with optional auto-switching secondary connector, and method for same

• US 6,928,175 B1
• Filed: 06/14/2000
• Issued: 08/09/2005
• Est. Priority Date: 06/14/2000
• Status: Active Grant

• Current Assignee: Creative Technology Ltd.
• Original Assignee: Creative Technology Ltd.
• Inventors: Bader, Carl, DeHelian, John
• Primary Examiner(s): Tran, Sinh
• Assistant Examiner(s): Faulk, Devona E
• Application Number:
  US09/594,524
• Time in Patent Office: 1,882 Days
• Field of Search: 381/123, 439/188, 439/441
• US Class Current: 381/123
• CPC Class Codes: G06F 3/165 Management of the audio stream, e.g. setting of volume, audio stream path
• CPC Class Codes: H01R 13/703 operated by engagement or disengagement of coupling parts, e.g. dual-continuity coupling partH01R13/71 takes precedence
• CPC Class Codes: H04M 1/6033 for providing handsfree use or a loudspeaker mode in telephone sets arrangements for preventing acoustic echo H04M9/08

Abstract

An audio system and circuit are disclosed that are operable in either a first configuration and a second configuration. The first configuration includes sound processing circuitry, a primary connector, and a header. The second configuration adds an optional secondary connector to the header. The system and circuit mutes or turns off the audio signal at the primary connector and the main output contacts (if any) upon insertion of a plug into the secondary connector in the second configuration. The system and circuit also optionally mutes or turns off the audio signal at a main output contact upon insertion of a plug into the primary connector in each of the first and second configurations. The system may also employ logic switches or FETs to interrupt the audio signal upon insertion of a plug into the secondary connector. The system uses a simple switchless interconnection between the secondary circuit and the main system.

Claims

1. An audio circuit comprising a sound source having an output for producing an audio signal, a primary connector, and a connector header, said primary connector being electrically coupled to said sound source output to receive the audio signal, said connector header comprising:

a header first contact electrically coupled to the sound source output;

a header second contact electrically coupled to said primary connector; and

a header ground contact that is electrically coupled to a ground;

each one of said header first contact and said header second contact being ungrounded;

said audio circuit adaptable to include a secondary connector circuit having a secondary connector and comprising;

a secondary connector first contact electrically coupled to said header first contact;

a normally-open secondary connector second contact electrically coupled to said header second contact; and

a normally-open switch electrically coupled to said header ground contact;

said switch being operable to electrically couple said header second contact to said header ground contact to short said primary connector to said ground while said switch is in its closed position;

said audio circuit being operable in each one of a first configuration that does not include said secondary connector circuit and a second configuration that includes said secondary connector circuit.

2. The audio circuit of claim 1 further comprising a main output contact disposed on the printed circuit board and being electrically coupled to said sound source output to receive the audio signal, the primary connector including a switch capable of muting the audio signal to the main output contact.

3. The audio circuit of claim 1 wherein said header includes:

a header fourth contact electrically coupled to a right channel signal of the sound source output, and a header third contact electrically coupled to a right contact of said primary connector;

said header first contact being electrically coupled to a left channel signal of the sound source output, said header second contact being electrically coupled to a left contact of said primary connector;

said secondary connector circuit including an other switch coupled to said header ground contact;

said other switch being operable to electrically couple said header third contact to said header ground contact to short said right contact of said primary connector to said ground while said switch is in its closed position.

4. The audio circuit of claim 3 wherein said header first contact, said header second contact, said left channel signal of said sound source output, and said left contact of said primary connector form a left audio channel;

and said header fourth contact, said header third contact, said right channel signal of the sound source output, and said right contact of said primary connector form a right audio channel.

5. The audio circuit of claim 1, configured in the second configuration wherein each one of said sound source output, said primary connector, and said connector header are mechanically affixed to a printed circuit board and the secondary connector is spaced apart from the printed circuit board, said secondary connector being connected to said header by a wiring harness.

6. The audio circuit of claim 5 wherein said primary connector is a local connector and said secondary connector is a remote connector.

7. The audio circuit of claim 6 wherein said primary connector is a rear headphone connector and said secondary connector is a front headphone connector.

8. The audio circuit of claim 2 wherein each one of said sound source output, said primary connector, and said main output contact being electrically coupled together in series such that said main audio contact receives the audio signal from the audio circuit through said primary connector.

9. The audio circuit of claim 1 further comprising a first op-amp, a first resistor, and a second resistor, said first op-amp electrically coupled to said sound source output, said first op-amp and said first resistor being electrically coupled between said sound source output and said header first contact, said second resistor being electrically coupled between said first op-amp and said primary connector.

10. The audio circuit of claim 9 wherein said first op-amp, said first resistor, and said header first contact are electrically coupled together in series, said second resistor is electrically coupled between an output of said op-amp and said header second connector;

and

said second resistor is electrically coupled between the output of said op-amp and said primary connector such that said header second contact and said primary connector are electrically coupled together in parallel relative to said second resistor.

11. The audio circuit of claim 4 further comprising a first op-amp, a second op-amp, a first resistor, a second resistor, a third resistor, and a fourth resistor;

said first op-amp, said first resistor, and said header first contact being electrically coupled together in series, said second resistor being electrically coupled between an output of said first op-amp and said header second contact, and said second resistor being electrically coupled between the output of said first op-amp and said left contact of said primary connector such that said header second contact and said primary connector are electrically coupled together in parallel relative to said second resistor, said second op-amp;

said second op-amp, said third resistor, and said header third contact being electrically coupled together in series, said fourth resistor being electrically coupled between an output of said second op-amp and said header fourth contact, and said fourth resistor being electrically coupled between the output of said second op-amp and said right contact of said primary connector such that said header fourth contact and said right contact of said primary connector are electrically coupled together in parallel relative to said fourth resistor.

12. The audio circuit of claim 1 further comprising a first op-amp, a second op-amp, a first resistor, and a second resistor, each one of said first op-amp and second op-amp electrically coupled to said sound source output in parallel, said first op-amp and said first resistor being electrically coupled between said sound source output and said header first contact, said second resistor being electrically coupled between said second op-amp and each of said header second contact and said primary connector such that said header second contact and said primary connector are coupled in parallel relative to said second connector.

13. The audio circuit of claim 12 further comprising a third op-amp, a fourth op-amp, a third resistor, and a fourth resistor;

each one of said third op-amp and said fourth op-amp being electrically coupled to a right channel signal of said audio circuit in parallel, said third op-amp, said third resistor, and said header third contact being electrically coupled together in series, said fourth resistor being electrically coupled between an output of said fourth op-amp and said header fourth contact, and said fourth resistor being electrically coupled between the output of said fourth op-amp and said right contact of said primary connector such that said header fourth contact and said right contact of said primary connector are electrically coupled together in parallel relative to said fourth resistor;

whereby said first op-amp and said first resistor are electrically coupled between a left channel signal of said sound source output and said header first contact, and said second resistor is electrically coupled between said second op-amp and each of said header second contact and a left contact of said primary connector such that said header second contact and said left contact of said primary connector are coupled in parallel relative to said second connector.

14. The audio circuit of claim 12 further comprising a main output contact disposed on the printed circuit board and being electrically coupled to said sound source output to receive the audio signal, the primary connector including a switch capable of muting the audio signal to the main output contact.

15. A dual-configuration audio system for processing an audio signal, said audio system being operable in each one of a first configuration and a second configuration, wherein:

said first configuration comprises;

a printed circuit board having a sound source mounted thereon, said sound source providing the audio signal;

a connector header having plural contacts therein and coupled to the printed circuit board and being in electrical communication with the sound source such that the audio signal is coupled to said header; and

an auto-muting primary connector including a primary socket coupled to the printed circuit board for removably receiving a primary plug, said primary connector receiving the audio signal; and

said second configuration comprises said printed circuit board, said header, and said primary connector, and further comprises;

a secondary connector including a secondary socket being spaced apart from said printed circuit board for removably receiving a secondary plug; and

a wiring harness having a wiring harness plug that is insertable into said header, said wiring harness electrically coupling said secondary connector to said header such that the secondary connector receives the audio signal.

16. The dual-configuration audio system of claim 15 wherein the audio signal is muted at the primary connector in response to insertion of the secondary plug into the secondary connector in the second configuration.

17. The dual-configuration audio system of claim 16 wherein the primary connector is shorted to a ground in response to insertion of the secondary plug into the secondary connector, thereby muting the audio signal at the primary connector.

18. The dual-configuration audio system of claim 15 further comprising a main output contact in electrical communication with the sound source and coupled to the printed circuit board, said main output contact receiving the audio signal, the audio signal being muted at the main output contact in response to insertion of the primary plug into the primary connector in said first configuration.

19. The dual-configuration audio system of claim 18 wherein the audio signal is muted at the main output contact in response to insertion of the secondary headphone plug into the secondary connector in the second configuration.

20. The dual-configuration audio system of claim 19 wherein the main output contact is shorted to a ground in response to insertion of the secondary plug into the secondary connector, thereby muting the audio signal at the main output contact and the primary connector.

21. The dual-configuration audio system of claim 15 wherein said header includes a non-conductive body and said plural pins that are disposed at least partially within said header body.

22. The dual-configuration audio system of claim 21 wherein said plural pins include an audio signal pin electrically coupled to the sound source for receiving the audio signal, a ground pin electrically coupled to a ground, a primary connector pin electrically coupled to said primary connector;

each one of said audio signal pin, said ground pin, and said primary connector pin in said secondary configuration being coupled via said wiring harness to said secondary connector in a mutually open configuration, said secondary connector including a shunt disposed therein.

23. The dual-configuration audio system of claim 22 wherein said shunt electrically couples said primary contact pin to said ground pin in response to insertion of the secondary plug into said secondary connector, thereby muting the audio signal at the primary connector.

24. The dual-configuration audio system of claim 23 further comprising a main output contact electrically coupled to the sound source for receiving the audio signal through said primary connector, said primary connector including an auto-muting switch that interrupts the audio signal in response to insertion of the primary plug into said primary connector.

25. The dual-configuration audio system of claim 24 wherein insertion of the secondary plug into said secondary connector shorts each one of said main output contact and said primary connector to ground.

26. The dual-configuration audio system of claim 24 wherein the main output contact is a loudspeaker contact.

27. The dual-configuration audio system of claim 21 wherein said plural pins include a left audio signal pin electrically coupled to the sound source for receiving a left channel signal of the audio signal, a right audio signal pin electrically coupled to the sound source for receiving a right channel signal of the audio signal, a ground pin electrically coupled to a ground, a left primary connector pin electrically coupled to a left contact of said primary connector, a right primary connector pin electrically coupled to a right contact of said primary connector;

each one of said left audio signal pin, said right audio signal pin, said left primary connector pin, said right primary connector pin, and said ground pin coupled to said primary connector in a mutually open circuit;

each one of said audio signal pin, said ground pin, and said primary connector pin in said secondary configuration being coupled via said wiring harness to said secondary connector, said secondary connector including a left shunt and a right shunt disposed therein, said left shunt electrically coupling said left primary connector pin to said ground pin in response to insertion of the secondary plug into said secondary connector, said right shunt electrically coupling said right primary connector pin to said ground pin in response to insertion of the secondary plug into said secondary connector.

28. The dual-configuration audio system of claim 27 further comprising a left main output contact and a right main audio contact, said left main output receiving a left channel signal of the audio signal through a left contact of said primary connector, said right main output receiving a right channel signal of the audio signal through a right contact of said primary connector, said primary connector including an auto-muting switch that interrupts the audio signal to each one of said left main audio contact and said right main audio contact in response to insertion of the primary plug into said primary connector, each one of said left main audio contact, said right main audio contact, said primary connector left contact, and said primary connector right contact being shorted to the ground in response to insertion of the secondary plug into said secondary connector.

29. The dual-configuration audio system of claim 15 wherein the sound source includes a coder/decoder processor that converts a digital input to an analog output to produce said audio signal.

30. The dual-configuration audio system of claim 15 wherein the primary connector is a local connector and said secondary connector is a remote connector, and said secondary plug is a secondary headphone plug.

31. The dual-configuration audio system of claim 30 wherein the primary connector is a primary headphone jack, said primary plug is a primary headphone plug, said secondary connector is a secondary headphone jack, and said secondary plug is a secondary headphone plug.

32. The dual-configuration audio system of claim 15 wherein the sound source is a codec.

33. The dual-configuration audio system of claim 29 wherein said primary headphone jack is accessible from a rear of a computer and said secondary headphone jack is accessible from a front of the computer.

34. The dual-configuration audio system of claim 15 further comprising a first op-amp, a second op-amp, a first resistor, and a second resistor, each one of said first op-amp and second op-amp electrically coupled to said sound source, said first op-amp and said first resistor being electrically coupled between said sound source and a header first contact, said second resistor being electrically coupled between said second op-amp and each of a header second contact and said primary connector such that said header second contact and said primary connector are coupled in parallel relative to said second connector.

35. An audio circuit comprising an audio signal device, a primary connector, and a switchless connector header, each one of the audio signal device, the primary connector, and the connector header being disposed on a printed circuit board, said audio circuit adaptable to include a secondary connector circuit comprising a secondary connector and a normally open secondary connector switch, said switch operating in response to insertion of a secondary plug into said secondary connector to mute or turn off said primary connector;

said audio circuit being operable in each one of a first configuration that does not include said secondary circuit and a second configuration that includes said secondary circuit.

36. The audio circuit of claim 35 wherein the audio signal device is an audio input device for receiving an audio signal, said primary connector being electrically coupled to audio input device, said connector header comprising:

a first contact electrically coupled to an input of said audio signal device;

a second contact electrically coupled to a signal voltage; and

a third contact electrically coupled to the primary connector;

said secondary connector switch disposed between the secondary connector and a ground, said secondary connector being electrically coupled between a ground and said third contact, said switch closing to short said primary connector to ground via said third contact in response to insertion of a secondary plug into said secondary connector, thereby turning off said primary connector.

37. The audio circuit of claim 35 wherein the audio signal device is an audio input device for receiving an audio signal, said primary connector being electrically coupled to audio input device, said connector header comprising:

a first contact electrically coupled to an input of said audio signal device;

a second contact electrically coupled to a signal voltage; and

a third contact electrically coupled to a control portion of a normally open primary switch primary connector, the switch being electrically coupled between the primary connector and a ground;

said secondary connector switch being disposed between the secondary connector and a ground, said secondary connector being electrically coupled between a control voltage and said third contact, said secondary connector switch closing to couple the control voltage to the control portion of the primary switch via said third contact in response to insertion of a secondary plug into said secondary connector, thereby closing the primary switch to turn off said primary connector.

38. The audio circuit of claim 37 wherein the control potion of the switch is a gate of an FET.

39. The audio circuit of claim 35 wherein the audio circuit is an audio input device for receiving an audio signal, said primary connector being electrically coupled to audio input device, said connector header comprising:

a first pair of contacts electrically coupled to a primary pair of channels of the audio input device and coupled to opposing sides of said primary connector;

a second pair of contacts electrically coupled to a secondary pair of channels of the audio input device said secondary connector switch being a pair of secondary connector switches disposed between the secondary connector and the first pair of header contacts, each one of the secondary connector switches having a contact that is coupled to a ground and another contact that is coupled to one of the first pair of header contacts, said secondary connector being electrically coupled to the audio input device via said second pair of contacts, the pair of secondary connector switches closing to electrically couple each side of the primary connector to ground via the first pair of header contacts to short said primary connector to ground in response to insertion of a secondary plug into said secondary connector, thereby turning off said primary connector.

40. The audio circuit of claim 35 wherein the audio circuit is an audio input device for receiving an audio signal, said primary connector being electrically coupled to a pair of primary channels of the audio input device, said connector header comprising:

a first contact electrically coupled to control portions of a pair of normally open primary switches that are electrically coupled between the primary connector and a ground;

a pair of second contacts electrically coupled to a secondary pair of channels of the audio input device;

the secondary connector switch having a contact that is coupled to a control voltage and another contact that is coupled to the first header contacts, said secondary connector being electrically coupled to the audio input device via the pair of second contacts, the secondary connector switch closing to electrically couple the control voltage to the control portion of the primary switches via the first contact in response to insertion of a secondary plug into said secondary connector, thereby closing the primary switch to turn off said primary connector.

41. The audio circuit of claim 40 wherein the primary switches are FETs and the control potion of each switch is a gate of the FET.

42. A method of coupling a secondary connector to a sound source that is operable for processing an audio signal either without the secondary connector or with the secondary connector coupled thereto, said method comprising the steps of:

providing a sound source for producing an audio signal, a connector header, and a primary connector, the header having three electrically spaced-apart contacts disposed therein, a first one of the three header contacts receiving the audio signal, a second one of the three header contacts electrically coupled to the primary connector, a third one of the three header contacts electrically coupled to a ground; and

removably coupling a secondary connector to said sound source via the header such that a switch in the secondary connector shorts the third header contact to the second header contact to mute the audio signal at the primary connector, the first header contact providing the audio signal to the secondary header.

43. An audio circuit having a generated audio signal electrically coupled to a header having a plurality of pins, and to a second audio output terminal, the audio circuit comprising:

a primary jack electrically coupled to the audio signal; and

the connector header having a first pin of the plurality of pins coupled to the generated audio signal and adaptable for removable connection with a secondary circuit having a secondary jack;

wherein the secondary jack is configured such that upon insertion of a secondary plug, the first pin on the connection header is grounded, such as to mute the audio signal at a primary audio output terminal.