US20010043456A1 - Portable computer with low power audio CD-player - Google Patents

Portable computer with low power audio CD-player Download PDF

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US20010043456A1
US20010043456A1 US09/801,386 US80138601A US2001043456A1 US 20010043456 A1 US20010043456 A1 US 20010043456A1 US 80138601 A US80138601 A US 80138601A US 2001043456 A1 US2001043456 A1 US 2001043456A1
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audio
cd
system
suspend mode
placing
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US6385734B2 (en
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Lee Atkinson
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Hewlett Packard Development Co LP
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Hewlett Packard Development Co LP
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Priority to US08/699,989 priority patent/US5838983A/en
Priority to US09/150,530 priority patent/US6088809A/en
Priority to US09/566,748 priority patent/US6378077B1/en
Priority to US09/801,386 priority patent/US6385734B2/en
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    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00Details not covered by groups G06F3/00 – G06F13/00 and G06F21/00
    • G06F1/26Power supply means, e.g. regulation thereof
    • G06F1/32Means for saving power
    • G06F1/3203Power management, i.e. event-based initiation of power-saving mode
    • G06F1/3206Monitoring of events, devices or parameters that trigger a change in power modality
    • G06F1/3215Monitoring of peripheral devices
    • G06F1/3221Monitoring of peripheral devices of disk drive devices
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02DCLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THIR OWN ENERGY USE
    • Y02D10/00Energy efficient computing
    • Y02D10/10Reducing energy consumption at the single machine level, e.g. processors, personal computers, peripherals or power supply
    • Y02D10/15Reducing energy consumption at the single machine level, e.g. processors, personal computers, peripherals or power supply acting upon peripherals
    • Y02D10/154Reducing energy consumption at the single machine level, e.g. processors, personal computers, peripherals or power supply acting upon peripherals the peripheral being disc or storage devices

Abstract

A system and method to reduce power consumption in a portable computer system while allowing the CDROM drive to continue playing audio CDs. When the system enters a suspend mode, the status of the CDROM drive is checked, and if it is playing an audio CD, it remains powered, otherwise power to the CDROM drive is also suspended. The system recognizes when the audio CD is finished playing and then places the CDROM drive into the suspend mode.

Description

    CROSS-REFERENCE TO RELATED APPLICATION
  • This application claims priority from provisional 60/019,109, filed Jun. 3, 1996, which is hereby incorporated by reference. However, the content of the present application is not necessarily identical to that of the priority application.[0001]
  • BACKGROUND AND SUMMARY OF THE INVENTION
  • Multimedia PCs often incorporate CD-ROM drives and audio subsections. CD-ROM players are valuable as data storage devices, but also may be used to play standard Audio CD disks. However, typical computers today require that the CPU be fully “on” to play an audio CD. As a result, a typical portable computer today can only play CDs for about 2-3 hours. [0002]
  • Operation of the Portable CD-ROM and Audio Subsection Today
  • Portable computers today are typically organized as a system consists of a Microprocessor and its support chips, as well as common peripherals (including, e.g., the graphics subsection, PCMCIA controller, hard disk and floppy disk controller, interface port control, e.g. for printer and serial busses, keyboard controller, etc.) which interface to the CPU. A fixed disk drive and CD-ROM are typically attached on a common bus, e.g. an IDE or SCSI bus. “ATAPI-compliant” CD-ROMs are capable of either data retrieval, or playing audio disks (so called “Redbook” or “CD-A” disks). The CD-ROM control signals and data come over the common bus, but audio signals are output directly from the CD-ROM on an independent analog output. [0003]
  • A typical example of a computer audio system employs an audio mixer or “SoundBlaster” compatible audio codec. The output of the CD-ROM is a common input to the Audio Mixer. The function of the mixer is to provide volume control of the CD-ROM outputs along with other PC sounds. The output of the mixer goes to a power amplifier, which outputs to speakers or to a headphone jack. The audio codec and power amplifier together form the Audio section of the computer. [0004]
  • A Real Time Clock (RTC) is a virtually universal peripheral to today's PCs. The RTC is always powered up, and is used to both keep track of the time and date and to act as an “alarm clock” to the system, whereby the system may be “woken” from Suspend after a predetermined time has passed. [0005]
  • Power management circuitry is an integral part of a typical battery-powered computer. Power management is principally controlled by a program in the CPU memory and enables active status to the peripherals and support logic of the system. [0006]
  • Typically, a low-power “Suspend” mode is supported, where the entire state of the system is frozen, timing clocks are turned off, and power is removed from any logic whose state is unimportant. Power to at least some portions of the system must remain active during Suspend. The function of Suspend mode is to freeze the condition of the system while taking the least amount of power. In Suspend, the only activity the system supports is to recognize a “wakeup” event and return to normal operation: the “RESUME” sequence may be initiated by the system (e.g. by button press, modem ring, Real time clock alarm, or low battery event). [0007]
  • Typical power dissipation for the unit in a FULL SUSPEND mode is about 200 milliwatts. After “Resume” from Suspend, power to all devices is returned, and the pre-existing states of the CPU, the operating system, and the application is restored to its state before Suspend was executed. [0008]
  • Suspend mode is usually entered after a period of inactivity, after a critical condition event (for instance, a low battery condition or overtemperature of the unit), or manually by the user. [0009]
  • Typically, when in Suspend mode, power to the fixed disk and CD-ROM drives are disconnected (shown here as SW[0010] 1 under the control of a SUSPEND status signal). The audio subsection is also placed into a non-functional mode; either power may be removed completely from the system or the Audio mixer/Codec and power amplifier may be placed into a non-functional SUSPEND mode under the control of the SUSPEND status line.
  • The peripheral components are also placed into inactive functionality or turned off by the single SUSPEND status. [0011]
  • Applications run within the CPU to play an audio CD. For example, within the Windows operating system, these utilities are called “Media Player” or “CD player,” though many such applications are known. [0012]
  • Limitation of Known Implementations
  • For the sole purpose of playing an Audio CD, today's portable computer uses more power than is required. This is because, in order to play an Audio Compact Disk today, the entire peripheral set remains powered and functional, although they are not being used. Since a full SUSPEND globally powers down all peripherals, it is not possible on today's portable computers to allow the system to suspend all unnecessary system elements while playing an audio CD. [0013]
  • Innovative System and Method for Low-Power CD Audio
  • The present application describes a computer system and method which provides a “CD-player Suspend” mode, where the audio section and CD-ROM are left active while the remaining system is placed into a low power mode. [0014]
  • BRIEF DESCRIPTION OF THE DRAWING
  • The disclosed inventions will be described with reference to the accompanying drawings, which show important sample embodiments of the invention and which are incorporated in the specification hereof by reference, wherein: [0015]
  • FIG. 1 is a typical computer system [from your writeup][0016]
  • FIG. 2 is a computer system according to the presently preferred embodiment [from your writeup]. [0017]
  • DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
  • The numerous innovative teachings of the present application will be described with particular reference to the presently preferred embodiment (by way of example, and not of limitation), in which: Portable computers today are typically organized as below: [0018]
  • The “System” consists of a CPU [0019] 1; here, the CPU refers to the Microprocessor and support chips themselves. The common peripherals 8 (including, e.g., the graphics subsection, PCMCIA controller, hard disk and floppy disk controller, interface port control (printer and serial busses), keyboard controller, etc.) interface to the CPU.
  • A fixed disk drive [0020] 2 and CD-ROM 3 are typically attached on a common bus, in this case an IDE or SCSI bus. “ATAPI-compliant” CD-ROMs are capable of either data retrieval, or playing audio disks (so called “Redbook” or “CD-A” disks). The CD-ROM control signals and data come over the IDE bus, but audio signals are output directly from the CD-ROM on an independent analog output.
  • A typical example of a computer audio system employs an audio mixer or “SoundBlaster” compatible audio codec [0021] 4. The output of the CD-ROM is a common input to the Audio Mixer. The function of the mixer is to provide volume control of the CD-ROM outputs along with other PC sounds. The output of the mixer goes to a power amplifier 5. Final output of the power amp is to speakers or to a headphone jack. The audio codec and power amplifier together comprise the Audio section of the computer.
  • A Real Time Clock (RTC) [0022] 6 is a universal peripheral to the PC. The RTC is always powered up, and is used to both keep track of the time and date and to act as an “alarm clock” to the system, whereby the system will be “woken” from Suspend after a predetermined time has passed.
  • Power management circuitry [0023] 7 is an integral part of the battery-powered computer. Power management is principally controlled by a program in the CPU memory and enables active status to the peripherals and support logic of the System.
  • This application describes a method and system for enabling a low power Audio CD player mode, where the CPU is put into Suspend and the Audio CD is allowed to play. Without this mode, a typical portable computer could only play CDs for about 2-3 hours; with this mode, performance of 10-15 hours on a battery charge is possible. The convenience is for mobile users who want to enjoy the performance of a standalone “Diskman” but don't want the carry weight and size of a separate player. [0024]
  • The basic operation for the presently preferred embodiment is to interrogate the status of the CD-ROM when a Suspend is initiated, and decide which of two low power states to configure the CD-ROM drive and the audio subsection to. The preferred embodiments include a system and method to separate “global” Suspend (whereby all peripherals are turned off) from the “CD-player” Suspend. [0025]
  • A. The hardware required for the presently preferred embodiment is not altogether unique but requires a certain minimum of functionality; [0026]
  • i. As with the traditional portable, the processor and peripheral set (graphics subsystem, processor and supporting chipset, keyboard controller, peripheral controller, etc) can be placed into a low-power SUSPEND mode. [0027]
  • ii. One important feature of the preferred embodiment is the ability to leave the Audio mixer portion of the Codec and the power amplifiers in an active state independent of the state of the peripherals or processor. In this state the output of the CD-ROM audio channel may be output through the codec and amplifiers. [0028]
  • iii. Another important feature of this embodiment is the ability to leave the CD-ROM active when playing an audio CD, independent of the Suspend status of the peripherals and processor. [0029]
  • iv. Another feature of this embodiment is the ability to remove power from the Fixed disk while leaving power to the CD-ROM (allowing the CD-ROM to remain active). There are several standard ways (and one unique way) to accomplish this. In one alternative, the Fixed disk drive may be placed into a low power Suspend condition independent of the CD-ROM. [0030]
  • v. Optionally, a signalling method for Audio CD commands (for example, fast forward, seek, skip) from the keyboard or control panel may become active when the unit is in a “CD Player Suspend” mode. [0031]
  • B. Logic is called during the system entrance into Suspend. [0032]
  • The purpose of this logic is to; [0033]
  • i. Interrogate the system to find if an audio CD is playing in the CD-ROM drive. This interrogation may be manual or automatic. [0034]
  • ii. As with traditional portables, configure the processor and all peripherals to lowest power mode (“Full Suspend”) if no audio disk is playing in the CD-ROM. [0035]
  • iii. (Unique to this invention) to configure the processor and peripherals to lowest power mode while allowing the CD-ROM drive and Audio subsection to remain active if an Audio CD disk is playing. [0036]
  • C. One feature of the preferred embodiment is a method to exit the low power “CD-player Suspend” once the audio CD is finished playing and configure the machine to an Active state, to a “Full Suspend” state, or to an “Off” state. [0037]
  • A. Specific Hardware Implementation [0038]
  • The figure below shows a specific Hardware implementation of the low power CD player. [0039]
  • 11. Section 11 comprises the CPU and its support chips. In this instance, the processor is a Pentium CPU and the support chips are the Opti [0040] 558 family (556, 557, 558, and 602 devices). A general purpose output of the 602 chip is set high by the CPU when a SUSPEND operation is to occur. Another general purpose output controls the new function, AUDIO SUSPEND. Both outputs are under control of the CPU via writes to I/O register locations across the ISA bus.
  • 12. The Fixed Disk drive [0041] 12 is connected to the IDE bus. The power to the fixed disk drive is enabled through a transistor which is turned OFF when Suspend is active. This switch is represented at SWI.
  • 13. The CD-ROM [0042] 13 has separate power control, enabled through SW3. SW3 is a transistor which is turned off when the signal AUDIO_SUSPEND from section 11 is active.
  • 14. The audio mixer and codec functions are performed with an ESS1688 device [0043] 14. The ESS1688 is a single-chip SoundBlaster-compatible device which interfaces to the CPU across an ISA bus. The ESS1688 device may be placed into “partial standby,” where the digital section (the Codec function of the ESS) is placed into suspend but the analog mixer section remains active. This enables the ESS device to continue to function as a volume control when the System is in CD-player Suspend mode. The ESS1688 device is placed into a partial standby mode by writes across the ISA bus to registers inside the device. Power is applied to the ESS1688 device during both SUSPEND or CD-Player Suspend modes. The specification for the ESS1688 may be obtained from ESS Technology, Inc., 48107 Landing Parkway, Fremont, Calif. 94538-6407, USA, and is hereby incorporated by reference.
  • 15. Power to the audio amplifiers [0044] 15 is enabled through a transistor gated by AUDIO_SUSPEND.
  • 16. The Real Time Clock [0045] 16 (RTC) function is performed by the 602 chip. the RTC functions are always active. In this specific implementation, the RTC is used to terminate the CD-player mode by waking the system after the audio CD will have finished playing.
  • 17. Power management circuitry [0046] 17 is an integral part of the battery-powered computer. Power management is principally controlled by a program in the CPU memory and enables active status to the peripherals and support logic of the System.
  • 18. The peripheral chips [0047] 18 (the graphics controller, fixed disk drive logic, parallel and serial port controls, etc) is powered off by disabling a transistor connected to VCC. (In usual practice, the register contents of these peripherals will be read and stored into non-volatile memory under control by the CPU before power is removed). The transistor is turned off when the signal SUSPEND is active.
  • 19. Because the CD-ROM drive [0048] 13 shares the IDE bus with the Fixed disk drive 12, and power is removed from the Fixed disk drive, the control lines attached to the IDE device will go low. Since the CD-ROM control lines are active low, this would force the CD-ROM into an active state and upset the state of the CD-ROM. To avoid this, the control lines to the CD-ROM must be forced into a non-active state. In the preferred embodiment, this function is performed by isolating the control lines to the CD-ROM with a tristatable buffer 19 gated by AUDIO_SUSPEND. The lines which are tristated include the RESET*, WRITE*, and READ*. The CD-ROM control lines are held inactive through the use of pullup resistors added between the CD-ROM inputs and VCC.
  • B. A Method to Enter and Exit CD-Player Mode [0049]
  • This process is performed when a SUSPEND is requested. According to the preferred method; the system interrogates whether the CD-ROM is playing an Audio CD and determines the appropriate power state of the system. The system then enables a mechanism for terminating the CD-Player suspend mode and returns the system to a Full Suspend mode. As is usual for any SUSPEND function, the software for performing these functions is stored in BIOS ROM accessible by the CPU. [0050]
  • 1. Interrogating the CD-ROM [0051]
  • Characteristic of an ATAPI compliant CD-ROM is the command “Play Audio CD.” This command will be issued by an application, for example the “Media Player” application under the Windows operating system. After this command is issued, the CD-ROM will play without any further instruction by the CPU. [0052]
  • In the preferred embodiment, the system determines if the CD-ROM is playing an Audio CD through an ATAPI query to the CD-ROM drive. Available, standard ATAPI commands include the REQUEST SENSE, INQUIRE, and READ CD commands. The CD-ROM will respond with a status byte indicating if an Audio CD is busy playing. [0053]
  • 2. No Audio CD is Playing [0054]
  • If no audio CD is playing (an ATAPI query answer replies negatively) then the entire system is placed into Full SUSPEND. The system performs normal SUSPEND function (copies all important register data to non-volatile memory and enables a Resume event) before concluding with the below power sequence; [0055]
  • a. The ESS1688 is put into Full Suspend. Full suspend is entered by setting bit [0056] 3 of the Power management register (register 227h) to a “0” (“ANALOG stays off”); then by pulsing bit 2 high, then low.
  • b. Power to the CD-ROM and to the power Amplifiers is turned off by setting the line AUDIO_SUSPEND active. [0057]
  • c. Power is removed from the remaining chipset (and main functional clocks are terminated) by setting the SUSPEND line active. [0058]
  • 3. An Audio CD is Playing [0059]
  • If an Audio CD is playing (ATAPI query returns “Playing Audio CD” status) then the CD-ROM drive and Audio are left active while the rest of the system is placed into Suspend. [0060]
  • After copying the state of the peripheral set registers to non-volatile memory (the normal operation before executing a full Suspend) the system performs the following timing sequence; [0061]
  • a. The ESS1688 is placed into “partial suspend.” Partial suspend is entered by setting bit [0062] 3 of the Power control register to a “1,” then by pulsing bit 2 high, then low.
  • b. Power to the CD-ROM is left to the CD-ROM, and to the power amplifiers by leaving the signal “CD-player Suspend” line inactive. [0063]
  • c. A mechanism is employed to terminate the CD-player mode and return to the Full Suspend mode when the CD is through playing. This mechanism uses the RTC device to periodically wake the System from “CD-player Suspend” to “Full awake” condition. This is accomplished by; [0064]
  • i. the RTC has an alarm feature. When the actual time matches a preset time, an “alarm” is issued. The alarm is activated by reading the present time, adding a certain amount to the time, then writing to the Alarm register inside the RTC. In this example, 15 minutes is added to the actual time to create the Alarm time (the alarm will ring 15 minutes later). The alarm registers are indexes 01h, 03h, and 05h inside the RTC I/O location of 70h and 71h. [0065]
  • ii. The alarm is enabled to wakeup the System by setting the IRQ *in this case, ISA IRQ[0066] 8 from the RTC) to generate a “RESUME” event. This is done by writing to the register SYSCFG 6Ah, bit 6 inside the 602 chip.
  • d. The system enters an otherwise “full” suspend by setting the Suspend line active. The CPU ([0067] 1), peripheral set (8), and hard drive (2) will become inactive and the isolation to the CD-ROM (9) will become active. The state of the CD-ROM is thus preserved, and the power amplifiers will continue to operate in the “CD-Player” suspend mode.
  • e. A mechanism checks to see if the Audio CD is finished playing. 15 minutes after the System enters CD-player suspend mode, the RTC will issue an IRQ and the system will RESUME. Normally upon a resume, a full restoration is made to the system and the peripheral set. For the preferred embodiment, a limited RESUME occurs, where the only task for the processor is to query the CD-ROM for playing status and the system repeats the entire process (at 1 above). If the CD-ROM has stopped playing the audio CD, a query to the CD-drive will return the status “Audio disk stopped.” In that case (no audio CD is playing) the system will enter at “2” and issue a full Suspend. If the Audio CD is playing, the system continues at “3” and the Audio CD continues playing. [0068]
  • According to one disclosed embodiment, there is provided a method for operating a portable computer system, comprising the steps of: receiving a command to place said system in a suspend mode; determining whether an audio CD is playing in a CDROM drive; if an audio CD is not playing, placing said system in a suspend mode; if an audio CD is playing, continuing to operate said CDROM drive, while placing the remainder of said system in a suspend mode. [0069]
  • According to another disclosed embodiment, there is provided a method for operating a portable computer system, comprising the steps of: receiving a command to place said system in a suspend mode; determining whether an audio CD is playing in a CDROM drive; if an audio CD is playing, then leaving said CDROM drive in its present state; isolating at least one of a plurality of CDROM control signals from other system signals; placing a digital section of an audio CODEC in a suspend mode; leaving an analog section of said audio CODEC in an active mode; and leaving at least one audio power amplifier in an active state; if an audio CD is not playing, then placing said CDROM drive in a suspend mode; placing said audio and digital sections of said CODEC in a suspend mode; placing said audio power amplifier in a suspend mode. [0070]
  • According to another disclosed embodiment, there is provided a portable computer system comprising: a microprocessor; a memory connected to said microprocessor; a display device connected to display data generated by said microprocessor; an audio controller connected to said microprocessor; an audio input device connected to said audio controller for reading audio data; a battery connected to power said microprocessor, memory, display device, audio controller, and audio input device; wherein said system may be placed in a suspend mode in which said microprocessor and display are placed reduced power state; and wherein said audio input device and said audio controller may be selectably placed in a reduced power state when said system is in said suspend mode. [0071]
  • Further Modifications and Variations
  • As will be recognized by those skilled in the art, the innovative concepts described in the present application can be modified and varied over a tremendous range of applications, and accordingly the scope of patented subject matter is not limited by any of the specific exemplary teachings given. [0072]
  • Variations of the CD-ROM Isolation Logic 9
  • The preferred approach isolates the CD-ROM from the IDE bus when the low power CD-Player suspend mode is enabled. There are other methods for accomplishing this; [0073]
  • 1. No isolation is used between the Fixed disk drive and the CD-ROM. There are 2 variations of this method; [0074]
  • a. The hard drive and CD-rom drive may be powered at the same time; no effort is made to isolate the CD-rom power from the hard drive power. The fixed disk may be placed in to a SUSPEND mode by writing to a control register in the Fixed disk itself. Because the Fixed Disk drive is powered up in this mode, it will not activate the (active low) control signals on its attached IDE bus as it would if powered off. This is not the preferred approach, since today the fixed disk drive consumes about half a watt when in SUSPEND (about 20% of the CD-Player suspend power budget). [0075]
  • b. The hard drive logic may be “input tolerant” so that when the hard drive is unpowered, there is no conduction between the IDE bus and the hard drive. No such drives exist today. [0076]
  • 2. Isolation may be used on the hard drive; instead of decoupling the IDE bus from the CD-rom drive during CD-Player mode, the hard drive may be decoupled and powered off. This requires the IDE interface logic to maintain an inactive state during the CD-Player Suspend. [0077]
  • 3. Isolation may consist of a latch instead of a tristatable buffer (section 9) since the purpose of the isolation is simply to maintain the present state of the CD-ROM. [0078]
  • 4. The CD-ROM may remain powered during either Full SUSPEND or CD-PLAYER SUSPEND, but have the CD-ROM enter a low-power Suspend condition instead of being powered off when no audio CD is playing. [0079]
  • Variations in the Audio Mixer
  • The audio mixer could be bypassed completely in CD-Player mode. Volume control could be done by other passive or active circuitry. In the preferred approach, volume control is performed simply with a potentiometer located between the Audio Mixer and the power amplifier. [0080]
  • Variations in Termination of CD-Player Mode
  • The preferred approach uses the RTC to wakeup the system periodically and re-evaluate the status of the CD-ROM. Other approaches may be used; [0081]
  • 1. The RTC may be set for a single maximum time before the CD-Player mode is exited. The time may be the maximum possible length of an audio CD (74 minutes) or the system may determine the playing time remaining on the present CD and set the RTC alarm for that length of time. [0082]
  • 2. The System could wake up upon an opening of the CD-drive tray. This would be more convenient to a user who wants to start playing another disk, since the application to initiate playing of the next CD would be available through the operating system. One possible implementation for this is to have the IRQ on the IDE bus wake the system from CD-PLAYER SUSPEND to Fully active, where the application which initiates the CD-player function could restart. [0083]
  • 3. The CD-Rom drive could accept commands from another control source when in CD-Player suspend for common Disk player commands such as track skip, fast forward reverse, etc. In this variation, control buttons which are read by the System during Fully On operation but are read by the CD-ROM when in CD-Player mode. A possible implementation for this is; [0084]
  • 1. On the system enclosure are dedicated lines for the CD-rom commands. During normal (fully ON) operation, these lines are read by the keyboard controller and instruct an audio disk player application running under the operating system. The Application itself instructs the CD_ROM to change tracks, etc by issuing ATAPI packet commands to the CD-ROM. [0085]
  • 2. During CD-Player mode, the buttons are read directly by the CD-ROM with no required intervention by the CPU. A possible implementation of this is to change the function of the IDE bus to signal the CD-ROM drive that the CD-Player mode is engaged, and to signal directly to the CD-ROM (not through the packet ATAPI commands) entrance to CD-player mode, the CD is alerted to use the alternative control lines instead of ATAPI commands. [0086]
  • Variation on the Method
  • The preferred approach interrogates the ATAPI CD-ROM by query commands to detect the playing status of the CD. Other methods exist to determine if a CD is playing an Audio Disk; [0087]
  • 1. Another method for determining if an audio CD is playing is for the application which initiates the CD-rom playing the Audio disk to “register” with the system when a play is initiated. Instead of the system reading the state of the CD-ROM drive, it can instead read simply a memory bit which is set by the application itself. [0088]
  • 2. The system can monitor the audio output stream of the audio mixer to determine if a CD-ROM is active. In this implementation, the system would measure the analog output of the CD-ROM to determine the status of the CD-ROM drive. The system could also use this to detect when an Audio CD is finished playing and terminate the CD-Player mode. [0089]
  • 3. An activity line from the CD-ROM itself could indicate that the CD-ROM is busy playing an audio CD. A possible implementation is for the Audio CD-rom to hold its DASP* line, Interrupt line, or Activity LED active during Audio CD play. The DASP* line is commonly used to indicate data read activity from a CD-ROM drive, but usually does not become active today during play of an Audio CD. So such an implementation would require an enhancement of the current ATAPI CD-ROM drive. [0090]
  • It should also be noted that the disclosed innovative ideas are not limited only to Windows, DOS or UNIX systems, but can also be implemented in other operating systems. [0091]
  • It should also be noted that the disclosed innovative ideas are not limited only to systems using ISA, EISA, and/or PCI busses, but can also be implemented in systems using other bus architectures. [0092]
  • It should also be noted that the disclosed innovative ideas are not limited only to systems based on an x86-compatible microprocessor, but can also be implemented in systems using 680x0, RISC, or other processor architectures. [0093]
  • It should also be noted that the disclosed innovative ideas are not by any means limited to systems using a single-processor CPU, but can also be implemented in computers using multiprocessor architectures. [0094]

Claims (18)

What is claimed is:
1. A method for operating a portable computer system, comprising the steps of:
receiving a command to place said system in a suspend mode;
determining whether an audio CD is playing in a CDROM drive;
if an audio CD is not playing, placing said system in a suspend mode;
if an audio CD is playing, continuing to operate said CDROM drive, while placing the remainder of said system in a suspend mode.
2. The method of
claim 1
, further comprising the steps of determining when said audio CD has finished playing, and then placing said CDROM drive in a suspend mode.
3. The method of
claim 1
, further comprising the step of when a predetermined time has expired, placing said CDROM drive in a suspend mode.
4. The method of
claim 1
, further comprising the steps of manually stopping said audio CD from playing, and then placing said CDROM drive in a suspend mode.
5. A method for operating a portable computer system, comprising the steps of:
receiving a command to place said system in a suspend mode;
determining whether an audio CD is playing in a CDROM drive;
if an audio CD is playing, then
leaving said CDROM drive in its present state;
isolating at least one of a plurality of CDROM control signals from other system signals;
placing a digital section of an audio CODEC in a suspend mode;
leaving an analog section of said audio CODEC in an active mode; and
leaving at least one audio power amplifier in an active state;
if an audio CD is not playing, then
placing said CDROM drive in a suspend mode;
placing said audio and digital sections of said CODEC in a suspend mode;
placing said audio power amplifier in a suspend mode.
6. The method of
claim 5
, further comprising the steps of determining whether said audio CD has finished playing, and if it has, then placing said CDROM drive in a suspend mode, placing said analog section of said CDROM drive in a suspend mode, and placing said audio power amplifier in a suspend mode.
7. The method of
claim 5
, further comprising the steps of manually stopping said audio CD from playing, and then placing said CDROM drive in a suspend mode, placing said analog section of said CDROM drive in a suspend mode, and placing said audio power amplifier in a suspend mode.
8. The method of
claim 5
, further comprising the steps of after a predetermined time has expired, placing said CDROM drive in a suspend mode, placing said analog section of said CDROM drive in a suspend mode, and placing said audio power amplifier in a suspend mode.
9. The method of
claim 5
, wherein said audio CODEC comprises an ESS1688 device.
10. A portable computer system comprising:
a microprocessor;
a memory connected to said microprocessor;
a display device connected to display data generated by said microprocessor;
an audio controller connected to said microprocessor;
an audio input device connected to said audio controller for reading audio data;
a battery connected to power said microprocessor, memory, display device, audio controller, and audio input device;
wherein said system may be placed in a suspend mode in which said microprocessor and display are placed reduced power state; and
wherein said audio input device and said audio controller may be selectably placed in a reduced power state when said system is in said suspend mode.
11. The system of
claim 10
, further comprising circuitry to isolate an input to said audio input device from a system bus when said system is in a suspend mode.
12. The system of
claim 10
, further comprising circuitry to indicate if said audio input device is providing audio input.
13. The system of
claim 11
,
12
, wherein said circuitry to isolate is a latch.
14. The system of
claim 11
,
12
, wherein said circuitry to isolate is a tristatable buffer.
15. The system of
claim 10
, further comprising circuitry to control said audio input device when said system is in a suspend mode.
16. The system of
claim 10
, wherein said audio input device is a CD-ROM drive.
17. The system of
claim 10
, wherein said audio input device may also be used as a data input device.
18. The system of
claim 10
, wherein said audio controller comprises an ESS1688 device.
US09/801,386 1996-06-03 2001-03-08 Portable computer with low power audio CD-player Expired - Fee Related US6385734B2 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US1910996P true 1996-06-03 1996-06-03
US08/699,989 US5838983A (en) 1996-08-20 1996-08-20 Portable computer with low power audio CD-player
US09/150,530 US6088809A (en) 1996-06-03 1998-09-10 Portable computer with low-power audio cd-player
US09/566,748 US6378077B1 (en) 1996-06-03 2000-05-09 Portable computer with low-power audio CD-player
US09/801,386 US6385734B2 (en) 1996-06-03 2001-03-08 Portable computer with low power audio CD-player

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US09/801,386 US6385734B2 (en) 1996-06-03 2001-03-08 Portable computer with low power audio CD-player
US10/134,937 US7055049B2 (en) 1996-06-03 2002-04-29 Portable computer with low-power audio CD-player

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US09/566,748 Continuation US6378077B1 (en) 1996-06-03 2000-05-09 Portable computer with low-power audio CD-player

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US10/134,937 Continuation US7055049B2 (en) 1996-06-03 2002-04-29 Portable computer with low-power audio CD-player

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US20010043456A1 true US20010043456A1 (en) 2001-11-22
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Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040064520A1 (en) * 2002-06-03 2004-04-01 International Business Machines Corporation Network identification information automatic management system and method
US9544707B2 (en) 2014-02-06 2017-01-10 Sonos, Inc. Audio output balancing
US9549258B2 (en) 2014-02-06 2017-01-17 Sonos, Inc. Audio output balancing
US9658820B2 (en) 2003-07-28 2017-05-23 Sonos, Inc. Resuming synchronous playback of content
US9681223B2 (en) 2011-04-18 2017-06-13 Sonos, Inc. Smart line-in processing in a group
US9729115B2 (en) 2012-04-27 2017-08-08 Sonos, Inc. Intelligently increasing the sound level of player
US9734242B2 (en) 2003-07-28 2017-08-15 Sonos, Inc. Systems and methods for synchronizing operations among a plurality of independently clocked digital data processing devices that independently source digital data
US9748647B2 (en) 2011-07-19 2017-08-29 Sonos, Inc. Frequency routing based on orientation
US9749760B2 (en) 2006-09-12 2017-08-29 Sonos, Inc. Updating zone configuration in a multi-zone media system
US9756424B2 (en) 2006-09-12 2017-09-05 Sonos, Inc. Multi-channel pairing in a media system
US9766853B2 (en) 2006-09-12 2017-09-19 Sonos, Inc. Pair volume control
US9787550B2 (en) 2004-06-05 2017-10-10 Sonos, Inc. Establishing a secure wireless network with a minimum human intervention
US9977561B2 (en) 2004-04-01 2018-05-22 Sonos, Inc. Systems, methods, apparatus, and articles of manufacture to provide guest access
US10031716B2 (en) 2013-09-30 2018-07-24 Sonos, Inc. Enabling components of a playback device
US10061379B2 (en) 2004-05-15 2018-08-28 Sonos, Inc. Power increase based on packet type
US10306364B2 (en) 2012-09-28 2019-05-28 Sonos, Inc. Audio processing adjustments for playback devices based on determined characteristics of audio content
US10359987B2 (en) 2003-07-28 2019-07-23 Sonos, Inc. Adjusting volume levels

Families Citing this family (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6385734B2 (en) * 1996-06-03 2002-05-07 Compaq Information Technologies Group, L.P. Portable computer with low power audio CD-player
US6675233B1 (en) * 1998-03-26 2004-01-06 O2 Micro International Limited Audio controller for portable electronic devices
US6954804B2 (en) * 1998-03-26 2005-10-11 Micro, Inc. Controller for portable electronic devices
US6895448B2 (en) 1998-03-26 2005-05-17 O2 Micro, Inc. Low-power audio CD player for portable computers
CN1197080C (en) * 1999-05-28 2005-04-13 松下电器产业株式会社 Semiconductor memory card, playback apparatus, recording apparatus, playback method, recording method, and computer-readable recording medium
US7890741B2 (en) * 2000-12-01 2011-02-15 O2Micro International Limited Low power digital audio decoding/playing system for computing devices
US7522966B2 (en) * 2000-12-01 2009-04-21 O2Micro International Limited Low power digital audio decoding/playing system for computing devices
US7522964B2 (en) 2000-12-01 2009-04-21 O2Micro International Limited Low power digital audio decoding/playing system for computing devices
US7522965B2 (en) 2000-12-01 2009-04-21 O2Micro International Limited Low power digital audio decoding/playing system for computing devices
US7526349B2 (en) * 2000-12-01 2009-04-28 O2Micro International Limited Low power digital audio decoding/playing system for computing devices
US20020082730A1 (en) * 2000-12-21 2002-06-27 Microsoft Corporation Universal media player
KR100408021B1 (en) * 2000-12-29 2003-12-01 엘지전자 주식회사 Interface apparatus and method for lcd system
US7725748B1 (en) 2000-12-29 2010-05-25 Intel Corporation Low power subsystem for portable computers
US20020162444A1 (en) * 2001-05-04 2002-11-07 Kang-Yeh Yu Method and system for playing music-related files
US6868460B1 (en) 2001-06-05 2005-03-15 Silicon Motion, Inc. Apparatus for CD with independent audio functionality
US20030169641A1 (en) * 2002-03-08 2003-09-11 Quartex A Division Of Primex, Inc. Time keeping system with automatic daylight savings time adjustment
TWI224247B (en) * 2002-05-21 2004-11-21 Realtek Semiconductor Corp Audio control circuit
US6924667B2 (en) * 2002-07-19 2005-08-02 O2Micro International Limited Level shifting and level-shifting amplifier circuits
US7117379B2 (en) * 2002-08-14 2006-10-03 Intel Corporation Method and apparatus for a computing system having an active sleep mode
US7058829B2 (en) * 2002-08-14 2006-06-06 Intel Corporation Method and apparatus for a computing system having an active sleep mode CPU that uses the cache of a normal active mode CPU
JP3964770B2 (en) * 2002-10-09 2007-08-22 株式会社東芝 Optical disc apparatus and method for controlling optical disc apparatus
TWI226618B (en) * 2002-11-08 2005-01-11 Asour Technology Inc Multifunctional compact disc player
US7254730B2 (en) * 2003-02-14 2007-08-07 Intel Corporation Method and apparatus for a user to interface with a mobile computing device
US7114090B2 (en) * 2003-02-14 2006-09-26 Intel Corporation Computing system with operational low power states
US7080271B2 (en) * 2003-02-14 2006-07-18 Intel Corporation Non main CPU/OS based operational environment
US7231532B2 (en) * 2003-09-30 2007-06-12 Intel Corporation Generating notifications by powered-down devices
KR101145542B1 (en) * 2004-10-27 2012-05-15 엘지전자 주식회사 Apparatus and method for controling Power Management
JP2006252329A (en) * 2005-03-11 2006-09-21 Toshiba Corp Information processor and starting control method
US8909947B2 (en) * 2006-09-28 2014-12-09 Dell Products L.P. System and method for remote use of information handling system audio components
US8346203B2 (en) 2009-08-14 2013-01-01 Apple Inc. Power management techniques for buffering and playback of audio broadcast data
JP4772903B2 (en) * 2009-12-25 2011-09-14 株式会社東芝 Information processing device

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69031807T2 (en) 1989-06-30 1998-04-09 Fujitsu Personal Syst Inc Method for reducing power consumption of a computer
US5632037A (en) 1992-03-27 1997-05-20 Cyrix Corporation Microprocessor having power management circuitry with coprocessor support
US5423045A (en) * 1992-04-15 1995-06-06 International Business Machines Corporation System for distributed power management in portable computers
JP3158364B2 (en) 1992-10-13 2001-04-23 ソニー株式会社 Electronics
US5389952A (en) * 1992-12-02 1995-02-14 Cordata Inc. Low-power-consumption monitor standby system
US5630144A (en) 1993-02-19 1997-05-13 Phoenix Technologies Ltd. Desktop computer monitor power control using keyboard controller
US5603040A (en) 1993-12-09 1997-02-11 Dell Usa, L.P. Power management control unit for a computer peripheral
JPH07257423A (en) 1994-03-24 1995-10-09 Suzuki Motor Corp Toe and adjustment device for automobile
JPH09101848A (en) 1995-10-04 1997-04-15 Hitachi Ltd Compact information processor for multi-media
US6385734B2 (en) * 1996-06-03 2002-05-07 Compaq Information Technologies Group, L.P. Portable computer with low power audio CD-player
US5838983A (en) 1996-08-20 1998-11-17 Compaq Computer Corporation Portable computer with low power audio CD-player

Cited By (76)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040064520A1 (en) * 2002-06-03 2004-04-01 International Business Machines Corporation Network identification information automatic management system and method
US10120638B2 (en) 2003-07-28 2018-11-06 Sonos, Inc. Synchronizing operations among a plurality of independently clocked digital data processing devices
US10296283B2 (en) 2003-07-28 2019-05-21 Sonos, Inc. Directing synchronous playback between zone players
US9658820B2 (en) 2003-07-28 2017-05-23 Sonos, Inc. Resuming synchronous playback of content
US10228902B2 (en) 2003-07-28 2019-03-12 Sonos, Inc. Playback device
US10387102B2 (en) 2003-07-28 2019-08-20 Sonos, Inc. Playback device grouping
US9727304B2 (en) 2003-07-28 2017-08-08 Sonos, Inc. Obtaining content from direct source and other source
US9727302B2 (en) 2003-07-28 2017-08-08 Sonos, Inc. Obtaining content from remote source for playback
US9727303B2 (en) 2003-07-28 2017-08-08 Sonos, Inc. Resuming synchronous playback of content
US10445054B2 (en) 2003-07-28 2019-10-15 Sonos, Inc. Method and apparatus for switching between a directly connected and a networked audio source
US9733893B2 (en) 2003-07-28 2017-08-15 Sonos, Inc. Obtaining and transmitting audio
US9734242B2 (en) 2003-07-28 2017-08-15 Sonos, Inc. Systems and methods for synchronizing operations among a plurality of independently clocked digital data processing devices that independently source digital data
US9733892B2 (en) 2003-07-28 2017-08-15 Sonos, Inc. Obtaining content based on control by multiple controllers
US9733891B2 (en) 2003-07-28 2017-08-15 Sonos, Inc. Obtaining content from local and remote sources for playback
US9740453B2 (en) 2003-07-28 2017-08-22 Sonos, Inc. Obtaining content from multiple remote sources for playback
US10216473B2 (en) 2003-07-28 2019-02-26 Sonos, Inc. Playback device synchrony group states
US10209953B2 (en) 2003-07-28 2019-02-19 Sonos, Inc. Playback device
US10365884B2 (en) 2003-07-28 2019-07-30 Sonos, Inc. Group volume control
US10359987B2 (en) 2003-07-28 2019-07-23 Sonos, Inc. Adjusting volume levels
US10185541B2 (en) 2003-07-28 2019-01-22 Sonos, Inc. Playback device
US9778900B2 (en) 2003-07-28 2017-10-03 Sonos, Inc. Causing a device to join a synchrony group
US10324684B2 (en) 2003-07-28 2019-06-18 Sonos, Inc. Playback device synchrony group states
US9778897B2 (en) 2003-07-28 2017-10-03 Sonos, Inc. Ceasing playback among a plurality of playback devices
US9778898B2 (en) 2003-07-28 2017-10-03 Sonos, Inc. Resynchronization of playback devices
US10185540B2 (en) 2003-07-28 2019-01-22 Sonos, Inc. Playback device
US10303431B2 (en) 2003-07-28 2019-05-28 Sonos, Inc. Synchronizing operations among a plurality of independently clocked digital data processing devices
US10175930B2 (en) 2003-07-28 2019-01-08 Sonos, Inc. Method and apparatus for playback by a synchrony group
US10175932B2 (en) 2003-07-28 2019-01-08 Sonos, Inc. Obtaining content from direct source and remote source
US10157033B2 (en) 2003-07-28 2018-12-18 Sonos, Inc. Method and apparatus for switching between a directly connected and a networked audio source
US10157034B2 (en) 2003-07-28 2018-12-18 Sonos, Inc. Clock rate adjustment in a multi-zone system
US10289380B2 (en) 2003-07-28 2019-05-14 Sonos, Inc. Playback device
US10157035B2 (en) 2003-07-28 2018-12-18 Sonos, Inc. Switching between a directly connected and a networked audio source
US10146498B2 (en) 2003-07-28 2018-12-04 Sonos, Inc. Disengaging and engaging zone players
US10303432B2 (en) 2003-07-28 2019-05-28 Sonos, Inc Playback device
US10031715B2 (en) 2003-07-28 2018-07-24 Sonos, Inc. Method and apparatus for dynamic master device switching in a synchrony group
US10140085B2 (en) 2003-07-28 2018-11-27 Sonos, Inc. Playback device operating states
US10133536B2 (en) 2003-07-28 2018-11-20 Sonos, Inc. Method and apparatus for adjusting volume in a synchrony group
US10282164B2 (en) 2003-07-28 2019-05-07 Sonos, Inc. Synchronizing operations among a plurality of independently clocked digital data processing devices
US9977561B2 (en) 2004-04-01 2018-05-22 Sonos, Inc. Systems, methods, apparatus, and articles of manufacture to provide guest access
US10254822B2 (en) 2004-05-15 2019-04-09 Sonos, Inc. Power decrease and increase based on packet type
US10126811B2 (en) 2004-05-15 2018-11-13 Sonos, Inc. Power increase based on packet type
US10228754B2 (en) 2004-05-15 2019-03-12 Sonos, Inc. Power decrease based on packet type
US10061379B2 (en) 2004-05-15 2018-08-28 Sonos, Inc. Power increase based on packet type
US10372200B2 (en) 2004-05-15 2019-08-06 Sonos, Inc. Power decrease based on packet type
US10303240B2 (en) 2004-05-15 2019-05-28 Sonos, Inc. Power decrease based on packet type
US10439896B2 (en) 2004-06-05 2019-10-08 Sonos, Inc. Playback device connection
US10097423B2 (en) 2004-06-05 2018-10-09 Sonos, Inc. Establishing a secure wireless network with minimum human intervention
US9866447B2 (en) 2004-06-05 2018-01-09 Sonos, Inc. Indicator on a network device
US9787550B2 (en) 2004-06-05 2017-10-10 Sonos, Inc. Establishing a secure wireless network with a minimum human intervention
US9960969B2 (en) 2004-06-05 2018-05-01 Sonos, Inc. Playback device connection
US9860657B2 (en) 2006-09-12 2018-01-02 Sonos, Inc. Zone configurations maintained by playback device
US9766853B2 (en) 2006-09-12 2017-09-19 Sonos, Inc. Pair volume control
US9749760B2 (en) 2006-09-12 2017-08-29 Sonos, Inc. Updating zone configuration in a multi-zone media system
US10028056B2 (en) 2006-09-12 2018-07-17 Sonos, Inc. Multi-channel pairing in a media system
US10306365B2 (en) 2006-09-12 2019-05-28 Sonos, Inc. Playback device pairing
US10136218B2 (en) 2006-09-12 2018-11-20 Sonos, Inc. Playback device pairing
US10228898B2 (en) 2006-09-12 2019-03-12 Sonos, Inc. Identification of playback device and stereo pair names
US10469966B2 (en) 2006-09-12 2019-11-05 Sonos, Inc. Zone scene management
US10448159B2 (en) 2006-09-12 2019-10-15 Sonos, Inc. Playback device pairing
US9813827B2 (en) 2006-09-12 2017-11-07 Sonos, Inc. Zone configuration based on playback selections
US9928026B2 (en) 2006-09-12 2018-03-27 Sonos, Inc. Making and indicating a stereo pair
US9756424B2 (en) 2006-09-12 2017-09-05 Sonos, Inc. Multi-channel pairing in a media system
US10108393B2 (en) 2011-04-18 2018-10-23 Sonos, Inc. Leaving group and smart line-in processing
US9681223B2 (en) 2011-04-18 2017-06-13 Sonos, Inc. Smart line-in processing in a group
US9686606B2 (en) 2011-04-18 2017-06-20 Sonos, Inc. Smart-line in processing
US9748647B2 (en) 2011-07-19 2017-08-29 Sonos, Inc. Frequency routing based on orientation
US9748646B2 (en) 2011-07-19 2017-08-29 Sonos, Inc. Configuration based on speaker orientation
US10256536B2 (en) 2011-07-19 2019-04-09 Sonos, Inc. Frequency routing based on orientation
US9729115B2 (en) 2012-04-27 2017-08-08 Sonos, Inc. Intelligently increasing the sound level of player
US10063202B2 (en) 2012-04-27 2018-08-28 Sonos, Inc. Intelligently modifying the gain parameter of a playback device
US10306364B2 (en) 2012-09-28 2019-05-28 Sonos, Inc. Audio processing adjustments for playback devices based on determined characteristics of audio content
US10031716B2 (en) 2013-09-30 2018-07-24 Sonos, Inc. Enabling components of a playback device
US9781513B2 (en) 2014-02-06 2017-10-03 Sonos, Inc. Audio output balancing
US9549258B2 (en) 2014-02-06 2017-01-17 Sonos, Inc. Audio output balancing
US9544707B2 (en) 2014-02-06 2017-01-10 Sonos, Inc. Audio output balancing
US9794707B2 (en) 2014-02-06 2017-10-17 Sonos, Inc. Audio output balancing

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