Control system for digital sound effect and the method of the same

• US 20030059057A1
• Filed: 09/24/2001
• Published: 03/27/2003
• Est. Priority Date: 02/02/2000
• Status: Active Grant

• Current Assignee: C-Media Electronics Inc.
• Original Assignee: C-Media Electronics Inc.
• Inventors: Cheng, Eric
• Granted Patent: US 6,990,382 B2
• Time in Patent Office: Days
• US Class Current: 381/61
• CPC Class Codes: H04S 3/00 Systems employing more than two channels, e.g. quadraphonic H04S5/00, H04S7/00 take precedence

Abstract

A control method for controlling the sound effect system, comprises implanting a control code into a sound effect data that is transmitted to a sub woofer speaker. Then, the sound effect data with the control code is transmitted to the sound effect system. Next step is to control speakers of the sound effect system by means of the control code. Wherein a data transmission frame between the sound effect system and a computer system for controlling the sound effect system comprises a plurality of bit cells, wherein the data transmission frame includes: a sound effect data transmitted by a data bit; and a control code transmitted by a control bit.

Claims

1. A control method for controlling the sound effect system, comprising:

implanting a control code into a sound effect data that is

transmitted to a sub woofer speaker;

transmitting said sound effect data with said control code to said sound effect system; and

controlling speakers of said sound effect system by means of said control code.

2. The method of claim 1, wherein a data transmission frame between said sound effect system and a computer system for controlling said sound effect system comprises a plurality of bit cells, wherein said data transmission frame includes:

a sound effect data transmitted by a data bit; and

a control code transmitted by a control bit.

3. The method of claim 2, wherein each said data bit and said control bit further divided by two sub-units comprises:

a first sub-unit of said data bit used to store a sound effect data transmitted from said computer system to said sound effect system;

a second sub-unit of said data bit used to store a status data transmitted back to said computer from said sound effect system;

a third sub-unit of said control bit used to store a control code transmitted from said computer system to said sound effect system, wherein said control code includes reset pattern; and

a fourth sub-unit of said control bit used to store a confirming code transmitted back to said computer from said sound effect system, wherein said confirming code is used to make sure that said computer system and said sound effect system are in the status of synchronization.

4. The method of claim 1, wherein a sampling timing for said controlling method comprises:

a first timing cycle utilized to indicate the beginning of data string, each said first timing cycle maintaining at “

logic one level”

;

a second timing cycle, said computer system indicating the signal by “

logic 1”

or “

logic 0”

using a voltage level to transmit data to said sound effect system during said second timing cycle; and

a second timing cycle and a fourth timing cycle, during said third and said fourth timing cycle, wherein said voltage levels are floating, thus a voltage output by said computer system is slightly higher than the level of “

logic 0”

.

5. The method of claim 4, wherein said sampling timing is generated by said phase lock loop (PLL).

6. The method of claim 5, wherein said third timing cycle is detected by a phase detector (PHD), a mask signal (“

logic zero”

) is generated to input to an AND GATE via a transmission line, thereby maintaining the voltages level of said transmission line at low level during said third timing cycle to prevent said PLL from being interrupted.

7. The method of claim 6, wherein further including fetching said transmitted data by using a data decoder and a timing recorder;

composing said fetched transmitted data to from said sound effect data and said control code; and

transmitting said sound effect data and said control code to means for playing said sound effect and to means defined by said control code.

8. The method of claim 3, comprising following steps to obtain said synchronization status between said computer system and said sound effect system:

transmitting a reset pattern from said computer system to said sound effect system by suing a transmission line of said sub woofer speaker;

fetching said reset pattern from said transmission line of a sub woofer speaker by said sound effect system;

recognizing said fetched reset pattern by said sound effect system, if said reset pattern is recognized, then transmitting a synchronization confirming code to said computer system;

fetching said confirming code from said sound effect system by said computer system; and

recognizing said confirming code, if said confirming code is correct, then transmitting control code to said sound effect system.

9. The method of claim 8, further comprising a predetermined threshold in order to wait for said sound effect system to transmit back said synchronization confirming code, when transmission delaying time (or the number of transmission times) of said transmitted reset pattern is over said predetermined threshold, then said computer system transmits said sound effect data without said control code.

10. A control system for controlling a sound effect system by using a digital control signal, comprising:

a computer system for generating a control code and a sound effect data to control said sound effect system; and

a control circuits implanted in said sound effect system to control a playing parameter of said sound effect system according to said control code and said sound effect data, wherein said control circuits generates a sampling timing in accordance with said control code, thereby creating frame synchronization between said computer system and said sound effect system, wherein said control code is implanted into said sound effect data that is transmitted to a sub woofer speaker.

11. The control system of claim 10, wherein each said data bit and said control bit further divided by two sub-units comprises:

a first sub-unit of said data bit used to store said sound effect data transmitted from said computer system to said sound effect system;

a second sub-unit of said data bit used to store a status data transmitted back to said computer from said sound effect system;

a third sub-unit of said control bit used to store a control code transmitted from said computer system to said sound effect system, wherein said control code includes reset pattern; and

a fourth sub-unit of said control bit used to store a confirming code transmitted back to said computer from said sound effect system, wherein said confirming code is used to make sure that said computer system and said sound effect system are in the status of synchronization.

12. The control system of claim 10, wherein said computer system includes sound effect control unit, said sound effect control unit comprising:

a PLL (phase lock loop) including a phase detector (PHD) used to generate said sampling timing;

a timing recorder responsive to said phase detector (PHD) to generate a timing signal;

a data encoder responsive to said timing signal to encode a status information of said sound effect system in order to transmit to said computer system via said sub woofer speaker; and

a data decoder responsive to said timing signal to decode said control code transmitted via said sub woofer speaker.

13. The control system of claim 12, wherein a sampling timing is generated by said phase lock loop for controlling, wherein said sampling timing comprises:

a first timing cycle utilized to indicate the beginning of data string, each said first timing cycle maintaining at “

logic one level”

;

a second timing cycle, said computer system indicating the signal by “

logic 1”

or “

logic 0”

using a voltage level to transmit data to said sound effect system during said second timing cycle; and

a second timing cycle and a fourth timing cycle, during said third and said fourth timing cycle, wherein said voltage levels are floating, thus a voltage output by said computer system is slightly higher than the level of “

logic 0”

.

14. The control system of claim 13, wherein said third timing cycle is detected by said phase detector (PHD), a mask signal (“

logic zero”

) is generated to input to an AND GATE via a transmission line, thereby maintaining the voltages level of a transmission line at low level during said third timing cycle to prevent said PLL from being interrupted.

15. The control system of claim 12, wherein said control system includes following steps to control said sound effect system:

fetching said transmitted data by using a data decoder and said timing recorder;

composing said fetched transmitted data to from said sound effect data and said control code; and

transmitting said sound effect data and said control code to means for playing said sound effect and to means defined by said control code.

16. The control system of claim 10, wherein said control system includes following steps to obtain said synchronization frame between said computer system and said sound effect system:

transmitting a reset pattern from said computer system to said sound effect system by suing a transmission line of said sub woofer speaker;

fetching said reset pattern from said transmission line of a sub woofer speaker by said sound effect system;

recognizing said fetched reset pattern by said sound effect system, if said reset pattern is recognized, then transmitting a synchronization confirming code to said computer system;

fetching said confirming code from said sound effect system by said computer system; and

recognizing said confirming code, if said confirming code is correct, then transmitting control code to said sound effect system.

17. The control system of claim 16, wherein said control system further comprises a predetermined threshold in order to waiting for said sound effect system to transmit back a synchronization confirming code, when transmission delaying time (or the number of transmission times) of said transmitted reset pattern is over said predetermined threshold, then said computer system transmits said sound effect data without said control code.