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Apple 17-INCH manual Digitizing Sound, Internal Speakers

Models: 17-INCH

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CHAPTER 3

Devices and Ports

Internal Speakers

The computer has two internal speakers, one on either side of the keyboard. The computer turns off the sound signals to the speakers when an external device is actively connected to the sound output jack and during power management.

Digitizing Sound

The sound circuitry digitizes and records sound as 44.1 kHz 16-bit samples. If a sound sampled at a lower rate on another computer is played as output, the Sound Manager transparently upsamples the sound to 44.1 kHz prior to outputting the audio to the sound circuitry.

When recording sound from a microphone, applications that may be affected by feedback should disable sound play-through by calling the Sound Manager functions.

Sound System

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Legacy Document 2003-03-01 © 2003 Apple Computer, Inc. All Rights Reserved.

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Apple 17-INCH manual Digitizing Sound, Internal Speakers

Contents

2003-03-01 PowerBook G4 17-inchApple Inc Contents Expansion Features Abbreviations Contents Figures and Tables Removing RAM expansion slot cover Organization of This Document Introduction to PowerBook G4 17-inchIntroduction PowerBook G4 17-inch Features Overview of PowerBook G4 17-inchAppearance 1Front view of the computer Computer Identification Peripheral DevicesSystem Software Open FirmwarePower Saving Features Reduced Processor PerformanceOperating Modes Overview of PowerBook G4 17-inch System Software Block Diagram Block Diagram and BusesPowerPC G4 Microprocessor Microprocessor and CachesMain ICs and Buses Bus Destinations Width of data path Intrepid Controller and BusesLevel 2 Cache Level 3 CacheEthernet Controller Boot ROMFireWire Controllers System RAMDMA Support ControllerATA-33 Interface Interrupt SupportUSB Interface Ultra ATA-100 InterfacePower Controller Sound CircuitryAirPort Extreme Interface CardBus Controller IC VCC USB ConnectorsPin Signal name USB PortsFireWire Ports FireWire 400 ConnectorUSB Storage Devices Pin Signal name Description FireWire 800 ConnectorTPB R TPA REthernet Port Booting from a FireWire DeviceTarget Disk Mode Pin Signal name Signal definitionRXN Internal ModemData Security AirPort ExtremeBluetooth Technology AirPort Extreme HardwareAirPort Extreme Software Hard Disk Drive Hard Disk Dimensions4Maximum dimensions of the internal hard disk Hard Disk ConnectorPin number Signal name Signal AssignmentsSignal name Signal description ATA Signal DescriptionsMedia type Reading speed maximum Writing speed SuperDrive DVD-R /CD-RWTrackpad KeyboardMedia type Reading speed maximum Keyboard Illustrations Changing the Operation of the Keyboard7Alternate operations of function and control keys Keyboard 8Embedded numeric keypad operation Keyboard Key name Control button Using the Fn KeyUsing the Num Lock Key Function KeysKeypad function Embedded KeypadOther Control Keys Key name Control button F10Flat-Panel Display Picture sizeBlack margins Frame rate Dual Display and Mirror ModeAnalog Monitor Resolutions External MonitorsDVI-I Connector Digital Display Resolutions15Main signals on the DVI-I connector Pin number Video output connector External Video PortPicture size Pixel depth 512 by 24 bpp Sound Inputs Sound SystemAudio Input Jack Modem Activity Sound SignalsSound Outputs Built-in MicrophoneInternal Speakers Digitizing SoundDevices and Ports Sound System RAM Expansion Slots Accessing the RAM SlotsElectrical Design of DDR RAM SO-DIMMs Mechanical Design of DDR RAM SO-DIMMsDDR Sdram Devices Configuration of DDR RAM SO-DIMMsRAM SO-DIMM Electrical Limits Address MultiplexingDevice size CardBus Slot Expansion Features CardBus Slot PowerPC G4 Microprocessor Apple Technical Notes3D Graphics Open Firmware Velocity Engine AltiVecMac OS KitPC Card Manager RAM Expansion ModulesFireWire Interface ATA DevicesUSB Interface Wireless Networks BluetoothDigital Visual Interface Supplemental Reference Documents Bluetooth Other Abbreviations Abbreviations and Standard UnitsCD-ROM AsicATA CASMDI ISOJedec LEDUSB SO-DIMMSPD Tmds