Timeslot scheduling in digital audio and hybrid audio radio systems

• US 8,199,769 B2
• Filed: 05/27/2008
• Issued: 06/12/2012
• Est. Priority Date: 05/25/2007
• Status: Active Grant

• Current Assignee: Apple Inc.
• Original Assignee: SiPort, Inc. (Intel Corporation)
• Inventors: Arad, Oren, Sharma, Sridhar, Waxman, Shay, Bydeley, David
• Primary Examiner(s): JAIN, RAJ K
• Application Number:
  US12/154,882
• Publication Number:
  US 20080291857A1
• Time in Patent Office: 1,477 Days
• Field of Search: None
• US Class Current: 370/459
• CPC Class Codes: H04L 27/2626 Arrangements specific to the transmitter only
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/22 using time-division multiplexing

Abstract

Systems and methods of decoding data streams and conserving power are described. In some embodiments, a stream of data containing audio and other data is divided into a plurality of timeslots. A first timeslot of the plurality of timeslots is allocated to a first service. A grant location message which indicates a location of the first timeslot allocated to the first service is generated. The grant allocation message and the plurality of timeslots are transmitted to a receiver.

The receiver may receive and decode the grant allocation message to identify OFDM symbols that carry information regarding the first service. The receiver may also receive the plurality of timeslots. The receiver may set a power mode of a component during OFDM symbols that indicate a status of the first service.

Claims

1. A method comprising:

dividing a stream of data into a plurality of timeslots;

allocating a first timeslot of the plurality of timeslots to a first service;

generating a grant allocation message that indicates a location of the first timeslot allocated to the first service;

transmitting the grant allocation message to a receiver; and

transmitting the plurality of timeslots to the receiver,

wherein the receiver selectively deactivates unused components of the receiver based at least in part on one or more of the plurality of timeslots.

2. The method of claim 1, wherein the stream of data comprises audio.

3. The method of claim 1, wherein allocating the first timeslot to the first service comprises creating gaps between timeslots that are allocated to data from similar services.

4. The method of claim 1, further comprising encoding the grant allocation message by OFDM.

5. The method of claim 1, wherein the plurality of timeslots comprises AAS packets.

6. The method of claim 1, wherein transmitting the grant allocation message to a receiver comprises transmitting the grant allocation message on a dedicated port on an AAS data stream.

7. A system comprising:

a transmission system configured to divide a stream of data into a plurality of timeslots, to allocate a first timeslot of the plurality of timeslots to a first service, and generate a grant allocation message that indicates a location of the first timeslot allocated to the first service;

a transmitter configured to transmit the grant allocation message and the plurality of timeslots to a receiver; and

the receiver configured to selectively deactivate unused components of the receiver based at least in part on one or more of the plurality of timeslots.

8. The system of claim 7, wherein the timeslot allocation module is further configured to encode the grant allocation message by OFDM.

9. The system of claim 7, wherein the transmission system is further configured to create gaps between timeslots within the plurality of timeslots that are allocated to data from similar services.

10. A method comprising:

receiving a grant allocation message;

decoding the grant allocation message to identify OFDM symbols that carry information regarding a first service;

receiving a plurality of timeslots;

setting a power mode of a component during OFDM symbols that indicate a status of the first service; and

selectively deactivating unused components of the receiver based at least in part on one or more of the plurality of timeslots.

11. The method of claim 10, wherein the status of the service indicates that a service is active.

12. The method of claim 11, wherein setting the power mode of the component comprises activating the component.

13. The method of claim 10, wherein setting the power mode of the component comprises setting the component to a power down mode when there is no indication that a second service is active.

14. The method of claim 10, wherein setting the power mode of the component comprises setting the component to a power standby mode when there is no indication that a second service is active.

15. The method of claim 10, further comprising parsing the grant allocation message.

16. A receiver comprising:

a tuner configured to receive a grant allocation message and a plurality of timeslots; and

digital signal processing hardware configured to decode the grant allocation message to identify OFDM symbols that carry information regarding a first service, set a power mode of a component of the tuner during OFDM symbols that indicate a status of the first service, and send power control signals to at least one component of the tuner, one or more analog to digital converters (ADCs), and digital hardware.

17. The receiver of claim 16, wherein the digital signal processing hardware configured to set the power mode comprises the digital signal processing hardware configured to set the power mode of the component to a power down mode when there is no indication that a second service is active.

18. The receiver of claim 16, wherein the digital signal processing hardware configured to set the power mode comprises the digital signal processing hardware configured to set the power mode of the component to a power standby mode when there is no indication that a second service is active.

19. The receiver of claim 16, wherein the digital signal processing hardware configured to set the power mode comprises the digital signal processing hardware configured to set the power mode of the component to a power on mode prior to OFDM symbols that indicate the status of the first device is active.