DUAL DECODER PORTABLE MEDIA DEVICE

• US 20080285660A1
• Filed: 05/14/2008
• Published: 11/20/2008
• Est. Priority Date: 05/14/2007
• Status: Active Grant

• Current Assignee: Western Digital Israel Limited (Western Digital Corporation)
• Original Assignee: SanDisk IL Ltd. (Western Digital Corporation)
• Inventors: Harari, Eliyahou, Raines, Moshe, Carmeli, Ran
• Granted Patent: US 8,265,166 B2
• Time in Patent Office: Days
• US Class Current: 375/240.25
• CPC Class Codes: G06F 1/3203 Power management, i.e. event-based initiation of a power-saving mode
• CPC Class Codes: G06F 1/3293 by switching to a less power-consuming processor, e.g. sub-CPU
• CPC Class Codes: H04N 5/775 between a recording apparatus and a television receiver
• CPC Class Codes: H04N 5/907 using static stores, e.g. storage tubes or semiconductor memories H04N5/91 takes precedence
• CPC Class Codes: H04N 9/7921 for more than one processing mode
• CPC Class Codes: H04N 9/8042 involving data reduction
• CPC Class Codes: H04N 9/8047 using transform coding
• CPC Class Codes: Y02D 10/00 Energy efficient computing, e.g. low power processors, power management or thermal management

Abstract

A portable media device 100 including two onboard hardware media decoders (124, 128) operative to decode a given digital content item 148 is provided. In some embodiments, one of the onboard hardware media decoders 128 has a relatively high power consumption and produces a relatively ‘high quality’ media signal, and the other of the onboard hardware media decoder 124 has a relatively low power consumption and produces a relatively ‘low quality’ media signal. In one non-limiting use case: (i) when no external power is available, the relatively ‘low power’ hardware media decoder 124 may generate a relatively ‘low quality’ media signal which is presented on an onboard display screen 140a and/or onboard speaker 140b; and (ii) when external power is available, the relatively ‘high power’ hardware media decoder 128 may generate a relatively ‘high quality’ media signal which is exported out of the portable media device 100 via one or more media ports, and presented on an external host presentation device 160 (for example, a large-screen television).

Claims

1. ) A portable media device for decoding a given digital content item, the media device comprising:

a) a device housing;

b) a first onboard hardware media decoder associated with the device housing, the first onboard hardware media decoder operative to decode the given digital content item to generate a first media signal;

c) a second onboard hardware media decoder associated with the device housing, the second onboard hardware media decoder operative to decode the given digital content item to generate a second media signal; and

d) a media output port mechanically integrated with the device housing for exporting at least one of the generated media signals.

2. ) The portable media device of claim 1 further comprising:

e) exactly one onboard display screen mechanically integrated with the device housing for displaying the first media signal, wherein;

i) the onboard display screen is operatively coupled to the first onboard hardware media decoder without being operatively coupled to the second onboard hardware media decoder; and

ii) the media output port is operatively coupled to the second onboard hardware media decoder to export the second media signal; and

iii) the first onboard hardware media decoder is configured within the portable media device such that no output media signal from the first onboard hardware media decoder may be exported from the portable media device to any external device.

3. ) The portable media device of claim 1 wherein a ratio between a power consumption of the second hardware media decoder and a power consumption of the first hardware media decoder is at least 2.

4. ) The portable media device of claim 3 further comprising:

e) an onboard power source for powering the first hardware media decoder wherein;

i) the media output port is a multi-function port that is also operative for receiving electrical power; and

ii) operation of the second hardware media decoder is contingent upon an availability of external power via the media output port.

5. ) The portable media device of claim 1 wherein:

i) the first hardware media decoder is a hardware video decoder that is operative such that the first media signal is a first video signal;

ii) the second hardware media decoder is a hardware video decoder that is operative such that the second media signal is a second video signal; and

iii) the first and second hardware media decoders are configured such that at least one video quality relation selected from the group consisting of a first video quality relation and a second video quality relation is true; and

iv) the first and second video quality relations are defined as follows;

A) according to the first video quality relation, a ratio between a total number of pixels of a video image of the first video signal and a total number of pixels of a video image of the second video signal is at most ⅓

; and

B) according to the second video quality relation, a ratio between a color depth of a video image of the first video signal and a color depth of video image of the second video signal is at least 1.5.

6. ) The portable media device of claim 1 wherein:

i) the first hardware media decoder is a hardware streaming video decoder that is operative such that the first media signal is a first video stream;

ii) the second hardware media decoder is a hardware streaming video decoder that is operative such that the second media signal is a second video stream; and

iii) a ratio between a frame refresh rate of the first video stream and a refresh rate of the second video stream is at most ½

.

7. ) The portable media device of claim 1 wherein:

i) the first and second hardware media decoders are operative so that at least one operation condition selected from the group consisting of a first operation condition and a second operation condition is true; and

ii) the first and second operations condition are defined as follows;

A) according to the first operation condition, the first and second hardware media decoders are operative to respectively generate the first and second media signals from the given digital media content item simultaneously; and

B) according to the second operation condition, one of the first and second hardware media decoders is operative to effect a respective decoding at a time when the other of the first and second hardware media decoder is dormant.

8. ) The portable media device of claim 1 wherein:

i) the first and second hardware media decoders are operative so that at least one operation condition selected from the group consisting of a first operation condition and a second operation condition is true; and

ii) the first and second operations condition are defined as follows;

A) according to the first operation condition, at least one of the first media signal and the second media signal is a static video signal; and

B) according to the second operation condition, each of the first hardware media decoder and the second hardware media decoder is a hardware streaming media decoder.

9. ) The portable media device of claim 1 wherein:

i) the first hardware media decoder is a hardware streaming video decoder that is operative such that the first media signal is a first video stream;

ii) the second hardware media decoder is a hardware streaming video decoder that is operative such that the second media signal is a second video stream; and

iii) the first hardware media decoder and the second hardware media decoder are configured to effect the respective decodings so that the first and second video streams are synchronized playback streams of the given content item.

10. ) The portable media device of claim 1 wherein:

i) the first hardware media decoder is a hardware streaming video decoder that is operative such that the first media signal is a first video stream;

ii) the second hardware media decoder is a hardware streaming video decoder that is operative such that the second media signal is a second video stream; and

iii) the device further comprises;

e) a user control for controlling a video stream time difference between the first and second playbacks.

11. ) The portable media device of claim 1 wherein:

i) the device further comprises;

e) an onboard media presentation device mechanically integrated with the device housing; and

ii) the second hardware media decoder and the media output port are configured within the portable media device to respond to an inter-device coupling via the media port that occurs at a time when;

A) the first hardware media decoder is decoding the given digital media content item to generate the first media signal from the digital media content item, and

B) the onboard display presentation device is presenting the first media signal, by;

I) commencing the decoding of the given digital media content item by the second hardware media decoder to generate the second media signal; and

II) commencing the exporting via the media output port of the second media signal.

12. ) The portable media device of claim 11 wherein the first hardware media decoder and the onboard media presentation device are configured within the portable media device to respond to the inter-device coupling by ceasing at least one of

i) the decoding of the digital content item by the first hardware media decoder;

and

ii) the presenting of the first media signal by the onboard media presentation device.

13. ) The portable media device of claim 11 wherein the first hardware media decoder and the onboard media presentation device are configured within the portable media device to continue:

i) the decoding of the digital content item by the first hardware media decoder; and

ii) the presenting of the first media signal by the onboard media presentation device

after the commencing of the decoding of the given digital content item by the second hardware media decoder which occurs after the inter-device coupling.

14. ) The portable media device of claim 11 wherein the second hardware media decoder is operative to commence the decoding of the given content item in accordance with a streaming media playback bookmark of the first hardware media decoder.

15. ) The portable media device of claim 1 wherein the first hardware media decoder and the second hardware media decoder are operative to simultaneously effect a playback of the given digital content item in a manner such that the second media signal provides at least one of:

i) a look-ahead functionality relative to the first media signal;

ii) a look-back functionality relative to the first media signal; and

iii) a flexible time domain relative to the first media signal.

16. ) The portable media device of claim 1 wherein:

i) the portable media device further comprises;

e) a media presentation device mechanically integrated with the device housing; and

ii) the first hardware media decoder, the onboard media presentation device, the second hardware media decoder and the media output port are configured within the portable media device to respond to an inter-device decoupling via the media port that occurs at a time when;

A) the second hardware media decoder is decoding the given digital media content item to generate the second media signal from the digital media content item; and

B) the media output port is exporting the second media signal, by;

I) ceasing the decoding of the digital media content item by the second hardware media decoder; and

II) commencing the decoding of the digital media content item by the first hardware media decoder to generate the first media signal and the presenting of the first media signal on the onboard display screen.

17. ) The portable media device of claim 1 wherein:

i) the portable media device further comprises;

e) an onboard display screen mechanically integrated with the device housing; and

ii) the first hardware media decoder, the onboard display screen, the second hardware media decoder and the media output port are configured within the portable media device to respond to an inter-device decoupling via the media port that occurs at a time when;

A) the second hardware media decoder is decoding the given digital media content item to generate the second media signal from the digital media content item;

B) the media output port is exporting the second media signal,

C) the first hardware media decoder is decoding the given digital media content item to generate the first media signal from the digital media content item; and

D) the onboard display screen is presenting the first media signal, by;

I) ceasing the second digital media playback of the digital media content item by the second hardware media decoder; and

II) continuing the first digital media playback of the digital media content item by the first hardware media decoder to generate the first video stream and the presenting of the first media on the onboard display screen.

18. ) The portable media device of claim 1 wherein:

i) the portable media device further comprises;

g) a user control for effecting a mode transition between any of a first mode, a second mode and a third mode; and

ii) the first, second and third modes are defined as follows;

A) when in the first mode, the first hardware media decoder is active and the second hardware media decoder is dormant;

B) when in the second mode, the second hardware media decoder is active and the first hardware media decoder is dormant; and

C) when in the third mode, both of the first hardware media decoder is active and the second hardware media decoder are active.

19. ) A portable media device comprising:

a) a first onboard hardware media decoder; and

b) a second onboard hardware media decoder;

c) control circuitry operative to;

i) determine if external available power is available to the portable media device;

ii) if the external power is available, activating the second onboard hardware media decoder; and

iii) otherwise, if the external power is not available, activating the first onboard hardware media decoder without activating the second onboard hardware media decoder.

20. ) The portable media device of claim 19 wherein a ratio between a power consumption of the second hardware media decoder and a power consumption of the first hardware media decoder is at least 2.

21. ) The portable media device of claim 19 wherein:

i) the first hardware media decoder is a hardware streaming video decoder that is operative to generate a first video stream;

ii) the second hardware media decoder is a hardware streaming video decoder that is operative to generate a first video stream; and

iii) the first and second hardware media decoders are configured such that at least one video quality relation selected from the group consisting of a first video quality relation, a second video quality relation and a third video quality relation is true; and

iv) the first, second and third video quality relations are defined as follows;

A) according to the first video quality relation, a ratio between a total number of pixels of a video image of the first video stream and a total number of pixels of a video image of the second video stream is at most ⅓

;

B) according to the second video quality relation, a ratio between a frame refresh rate of the first video stream and a refresh rate of the second video stream is at most ½

; and

C) according to the third video quality relation, a ratio between a color depth of the first video stream and a color depth of the second video stream is at least 1.5.