Graphical interface components for in-dash automotive accessories

<u>TECHNICAL FIELD</u>

0001This invention relates to in-dash automotive accessories having bit-mapped graphical display panels, and to operator interfaces used in such automotive accessories. More particularly, the invention relates to menus of available application programs and to graphical control elements that are available to such application programs from an operating system of an automotive accessory.

<u>BACKGROUND OF THE INVENTION</u>

0002Microsoft Corporation has developed specifications and software for an automotive entertainment and computer accessory system that includes a variety of different elements such as a security subsystem, a navigation subsystem, and an entertainment subsystem. These elements are implemented in part by computer programs that execute under the control and supervision of an operating system.

0003The operating system implements a graphical user interface (GUI) similar to popular desktop operating systems. Such operating systems typically have application programming interfaces (APIs) for use by application programs. Application programs can use the APIs to easily create different types of operator interface controls. For example, the operating system might make available a "list box" control. A list box is used to display a list of choices, such as text, color, icons, or other graphics, from which the user can select one or more items. A variety of other controls are also available as described in <nplcit id="ncit0001" npl-type="b"><text>Simon, Richard, Windows 95 Win32 Programming API Bible, Book 1, Waite Group Press, 1996</text></nplcit>.

0004Although such controls have been very effective in the desktop environment, they are difficult to work with in an automotive accessory having a relatively small display size. The invention embodiment described below has a color graphics panel with a resolution of only 256 X 64 pixels. No more than about four lines of text can be legibly displayed on such a panel. This factor makes it very difficult to work with traditional controls such as list boxes, drop-down list boxes, combo boxes, etc.

0005In addition, there are other factors that must be considered when designing an effective operator interface in the automotive environment. For example, the lighting in an automobile often results in high display contrast and glare, accompanied by generally low light levels that make it difficult to discern small graphical elements, especially on LCD displays. Furthermore, the user of the operator interface is often the driver of the automobile, who should be able to perceive presented information with little more than a quick glance.

0006With these factors in mind, the inventors have sought to design an interface and associated controls that are more effective in the automobile environment than traditional interfaces and controls.

0007<patcit id="pcit0001" dnum="EP0366132A"><text>EP 0366132A</text></patcit>, considered as closest prior art, discloses a multi-function operating device for motor vehicles in which all control is carried out by a single bi-directional rotary switch having stop positions and axial movement which is used to select function groups and to select them by means of an enter function arrangement whereby the switch is depressed. Different function groups are displayed on a small video screen display arranged in a circle, or in an arc. The rotary switch is rotated in order to highlight each of the function groups in turn, and once the desired function group is highlighted, the switch is depressed in order to selected it. Examples of function groups are an air conditioning system, a navigating system, a car radio, a car telephone, an antitheft system, a vehicle computer and a diagnostic unit.

0008<patcit id="pcit0002" dnum="US5555172A"><text>US 5,555,172</text></patcit> describes a data entry system in a vehicle which includes a display of either icons, alphabet letters, numerals or a combination of visual and alpha-numeric information, and allows the user to select data for entry. Information entry controls are located at the forward edge of an armrest console including a rotary left-right switch and a number of buttons. In use, a screen display will normally carry five icons corresponding to things such as a telephone system, a page message reading section, a compass and odometer display, navigation and route information display. Movement of the rotary switch will cause the highlighted icon to change with movement of the switch to the left or right scrolling around to the other end passing the end-most icon. The system also allows the entry of alpha-numeric characters when a selection block is highlighted, and the user will use the rotary switch in order to change the alpha-numeric character displayed in the block until the appropriate character is selected when a button is pressed to select it. Only one character is displayed on the screen at any one time associated with a particular block.

0009<patcit id="pcit0003" dnum="WO9525397A"><text>WO 95/25397</text></patcit> discloses a universal user interface for a cellular mobile telephone including a display for outputting a menu. The display can generate icons and symbols resembling a Windows type of user interface.

0010<patcit id="pcit0004" dnum="US5089826A"><text>US 5 089 826</text></patcit> discloses a navigation system for a movable body with different function switches and scroll switches for a display.

0011<patcit id="pcit0005" dnum="DE29611386U1"><text>DE 296 11 386 U1</text></patcit> discloses an automotive screen system with a user interface having a separate input unit for switching and selecting symbols on the display screen.

0012<patcit id="pcit0006" dnum="WO9713657A"><text>WO 97/13657</text></patcit> discloses a driver control interface system in a vehicle that displays information from the vehicle to the driver. A plurality of selection switches and a plurality of feature group switches are located on a directional input unit.

0013<patcit id="pcit0007" dnum="DE4033829"><text>DE 40 33 829</text></patcit> discloses an onboard display system with switches for scrolling through menu elements shown on the display.

0014<patcit id="pcit0008" dnum="EP0701926A"><text>EP 0 701 926</text></patcit> discloses a multifunction display input system for vehicles with different selection keys. Frequently used functions are activated by special keys.

<u>Summary of the Invention</u>

0015Therefore, in view of the closest prior art given by the disclosure of document <patcit id="pcit0009" dnum="EP0366132A"><text>EP 0366132A</text></patcit>, it is the object of the present invention to adapt the automotive accessory as disclosed by <patcit id="pcit0010" dnum="EP0366132A"><text>EP 0366132A</text></patcit> to enable control of additional application programs.

0016This object is solved by the subject matter of claim 1.

0017Preferred embodiments are defined by the dependent claims.

0018The invention is implemented in an automotive accessory having a small display panel visible to the driver or other user of the vehicle. A user or operator interface in accordance with the invention includes a start menu having a horizontal row of application icons that are scrollable in response to user commands. The icons correspond to applications supported by the underlying hardware and software system, including after-market applications that are installed by users. The start menu has a fixed, centered focus position, with the icons being scrolled in either direction past the focus position.

0019There are several ways for a user to navigate to different icons. A "start" key initiates the start menu. After pressing the "start" key, left and right arrow keys can be used to scroll in either direction. Alternatively, pressing the "start" key repeatedly scrolls through the icons in one direction. If the focus is left on a particular icon for a predetermined duration, the icon and its corresponding application is automatically activated.

0020The automotive accessory has numeric keys that also serve as shortcut keys. The user can establish a correspondence between any shortcut key and an application icon. Pressing the shortcut key (after pressing the "start" key to initiate the start menu) immediately activates the corresponding icon and its application. Within the scrolled list, any application icons assigned to shortcut keys are displayed in the order of their shortcut keys.

0021The invention also includes a visual control, implemented by an operating system, for use by application programs, which allows a variety of different input items to be listed in the same control. Such a control includes any specified combination of items of the following types: (a) an edit item having a variable that is editable in response to a user select command; (b) an adjustable item having a variable that is changeable through a series of predefined values in response to user adjustment commands; (c) a selection item that opens a secondary control in response to a user select command; and (d) a combination item having a variable that is changeable through a series of predefined values in response to user adjustment commands, the combination item opening a secondary control in response to a user selection command.

0022According to a first aspect of the invention there is a computer-readable medium having instructions for implementing an operator interface in an automotive accessory, the instructions being executable to perform steps comprising: scrolling a plurality of application icons in response to user scroll commands, wherein the application icons correspond to different applications in the automotive accessory; focusing on any application icon that is scrolled to a fixed focus position; activating the application corresponding to the focused application icon in response to a user selection command.

0023According to a second aspect of the invention there is an in-dash automotive entertainment and computer accessory executing the instructions comprising a computer-readable medium according to the first aspect of the invention, the accessory thereby performing the steps of the instructions.

0024A number of preferred or advantageous features are referred to in the dependent claims.

<u>BRIEF DESCRIPTION OF THE DRAWINGS</u>

0025<ul id="ul0001" list-style="none" compact="compact"><li><figref idref="f0001">Fig. 1</figref> is a perspective view of an in-dash automotive entertainment and computer accessory in accordance with the invention.</li><li><figref idref="f0002">Fig. 2</figref> is a block diagram of the in-dash automotive entertainment and computer accessory of <figref idref="f0001">Fig. 1</figref>.</li><li><figref idref="f0003">Figs. 3-5</figref> are illustrations of a start menu interface in accordance with the invention.</li><li><figref idref="f0003 f0004">Figs. 6-14</figref> are illustrations of a visual control in accordance with the invention.</li></ul>

<u>DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT</u>

0026<figref idref="f0001">Fig. 1</figref> shows an in-dash automotive entertainment and computer accessory 50 in accordance with the invention. In the illustrated implementation, the automotive accessory 50 is a vehicle computer that includes a variety of different elements as mentioned above. In other embodiments, the accessory might be a car radio, cassette player, CD player, or similar device with more extensive operator controls than are usually available in traditional accessories of these types.

0027Automotive accessory 50 has a base module 52 and a detachable faceplate 54. Base module 52 includes a housing 56, which is sized to be mounted in a vehicle dashboard similar to a conventional car stereo. Preferably, housing 56 has a form factor of a single DIN (Deutsche Industry Normen). The base module could alternatively be housed in a 2 DIN unit or other special form factor for an OEM.

0028In the described implementation, base module 52 is a computer that runs a multitasking operating system to support multiple applications. One preferred operating system is a Windows brand operating system sold by Microsoft Corporation, such as Windows 95, Windows CE, Windows NT or other derivative versions of the Windows family of operating systems. The computer and operating system are configured to support after-market peripherals including both hardware and software components. Applications supported by the operating system include audio entertainment applications, navigational applications, and system utility applications such as the well-known "control panel" application common in Windows operating systems. The automotive accessory also includes a speech recognition system that facilitates voice activation of various features, allowing the driver to verbally enter commands in a hands-free, eyes-free environment. After-market applications can be installed by a user after purchase of automotive accessory 50.

0029The operating system exposes various application programming interfaces (APIs) as is common in Windows operating systems. Such APIs can be called and used by application programs.

0030The computer 52 includes at least one storage drive that permits a user to download application programs and data from a storage medium. In the illustrated implementation, the computer 52 has a CD ROM drive 58 that reads application-related CDs, as well as musical, video, game, or other types of entertainment CDs. In this manner, the CD ROM drive 58 performs a dual role of storage drive and entertainment player. Also, a hard disk drive (not shown in <figref idref="f0001">Fig. 1</figref>) is included on the computer module 52. The hard disk drive can be used for storing both application programs and user data. The computer base module 52 has an optional 3.5" floppy diskette drive 60, a smart card reader 62, and dual PCMCIA card sockets 64 which accept PC (or PCMCIA) card types II and III. The faceplate 54 can be rotated to expose and permit easy access to the storage drives. In other implementations, the faceplate 54 has slots to permit access to one or more of the memory drives.

0031Faceplate 54 functions as an operator interface, having a keypad 66 and a graphical display 68. The faceplate is mountable for viewing by a vehicle operator. The display 68 is preferably a backlit LCD panel having a rectangular array of pixels that are individually selectable for illumination or display. The LCD panel is preferably a medium-resolution, bit-mapped display system having at least 10,000 pixels. In the described implementation, the array of pixels has a size of at least 256 X 64 pixels, which is quite limited in comparison to most desktop displays. The operating system of base module 52 interacts with faceplate keypad 66 and faceplate display 68 as peripheral devices when the faceplate 54 is attached to the base module 52.

0032The faceplate 54 has a start button or key 70 that provides the familiar "Start" functions of a Windows brand operating system, in addition to other functions that will be described below. The faceplate 54 also has a power button or key 72, four directional navigation keys or arrow keys 74 (including vertical and horizontal arrow keys), an "enter" button or item selection key 76, an "escape" button or key 78, a "help" button or key 80, a "menu" button or key 82, a volume control input 84, and a plurality of number keys 85.

0033Accessory 50 also supports an IrDA (infrared developers association) transceiver port 88 mounted on the faceplate 54 to transmit and receive data and programs using infrared signals.

0034<figref idref="f0002">Fig. 2</figref> is a simplified block diagram showing pertinent components of automotive accessory 50. The device has a conventional computer architecture, including a microprocessor 90, associated addressable memory 91 (including non-volatile memory and high-speed volatile memory), optional mass storage 92, and peripheral drivers 93. In addition, the device includes keypad 66 and a graphics display 68. Other components, not shown, provide different types of entertainment functionality as described in the patent application cited above. The various components communicate internally through a parallel data bus 98.

0035The data processor of accessory 50 is programmed by means of instructions stored at different times in the various computer-readable storage media of the device. Programs are typically distributed, for example, on floppy disks or CD-ROMs. From there, they are installed or loaded into the secondary memory of a computer. At execution, they are loaded at least partially into the computer's primary electronic memory. The invention described herein includes these and other various types of computer-readable storage media when such media contain instructions or programs for implementing the steps and features described below in conjunction with a microprocessor or other data processor. The invention also includes the computer and other devices themselves when programmed according to the methods and techniques described below.

0036Automotive accessory 50 can be used to integrate multiple vehicle-related systems onto one open platform. For instance, the accessory can serve as a multimedia entertainment system, a navigation system, a communications system, a security system, and a diagnostics system. Moreover, the accessory provides additional functionality traditionally associated with desktop and laptop personal computers. For instance, with the additional of a peripheral display device it can support word processing applications, spreadsheet applications, database applications, and appointment/schedule applications. Furthermore, the vehicle accessory 50 can be configured to operate as a server to other computing units in a vehicle to distribute games, video movies, and the like to passengers.

0037Vehicle accessory 50 may support a number of components and features that are not discussed herein. For more detail regarding such features refer to a <patcit id="pcit0011" dnum="US56458695A" dnum-type="L"><text>U.S. Patent Application Serial Number 08/564,586, entitled "Vehicle Computer System", which was filed November 29, 1995</text></patcit> and is assigned to Microsoft Corporation.

0038<figref idref="f0003">Fig. 3</figref> shows a high-level visual operator interface 100 used in the exemplary embodiment of the invention, referred to herein as a "start" menu interface. The visual interface is created and presented by displaying the described elements on graphical display 68.

0039Start menu interface 100 has a plurality of application icons 102 that are scrollable horizontally on the visual operator interface in response to several different user commands. For example, repeatedly pressing the start key 70 scrolls the icons in a leftward direction. The directional navigation keys 74 also scroll through the icons in different directions: the up and right arrow keys scroll the icons to the left, while the down and left arrow keys scroll the icons to the right. Speech commands ("next" and "previous") are also available to scroll the icons.

0040Application icons 102 correspond to applications supported and executed by the operating system. For example, the centered icon 104 in <figref idref="f0002">Fig. 2</figref> corresponds to a CD player application. Other icons might correspond to a radio application, an audio control application, a control panel application, etc. Some of the icons correspond to applications installed by the user of the automobile computer system. When a new application is installed by a user, an icon corresponding to the installed application is added to start menu interface 100 automatically by the operating system.

0041The start menu interface has a fixed focus position that is centered relative to the visible application icons; any application icon that is scrolled to the centered focus position becomes focused. The focus is indicated or highlighted by a changed color the focused icon is displayed in color, while the surrounding non-focused icons are displayed in monochrome or greyscale. Icon 104 occupies the focus position in <figref idref="f0003">Fig. 3</figref>.

0042<figref idref="f0003">Fig. 4</figref> shows the results of scrolling the icons horizontally to the left. The next application icon to the right (corresponding in this case to a control panel application) receives the focus.

0043The currently focused application icon is activateable to select or initiate the application corresponding to the focused application icon. A user activates the focused application icon by pressing the "enter" key 76. The focused application can also be activated through a speech command such as "select" "enter," or "start."

0044Furthermore, the start menu interface utilizes an automatic timeout selection scheme to activate applications. Specifically, after any particular application icon has been the subject of the focus for a predetermined timeout period, the focused icon and its application are automatically activated, without requiring the user to press the "enter" key.

0045The start menu interface has a field 106 that displays a textual name of the application corresponding to the currently focused application icon. In <figref idref="f0003">Fig. 3</figref>, the focused application icon corresponds to a CD player application, so field 106 displays the label "Disk Player." The displayed label also corresponds to a voice command that the user can speak to activate the icon.

0046Referring now to <figref idref="f0003">Fig. 5</figref>, the start menu interface also has a field 108 that contains one or more general status enunciators. Such status enunciators are presented when one of the application programs running under the operating system has information such as status information for presentation to the user. For example, an exclamation point is used in <figref idref="f0003">Fig. 5</figref> as a general status enunciator. Other indicators might be used to indicate different types of status or status information. In addition to the general status enunciator, application-specific status enunciators are presented in conjunction with application icons whose corresponding applications have information for presentation to the user. <figref idref="f0003">Fig. 5</figref> shows an application icon with an application-specific status enunciator 110, comprising in this case a "mute" symbol over the application icon, indicating that the audio system is muted.. When a user notices a general status enunciator, the user can then scroll through the available application icons to see which one has an application-specific status enunciator. Generally, the information or status held by the corresponding application program can be viewed by activating the application icon.

0047In addition to the methods mentioned above for scrolling and activating application icons, start menu interface 100 includes the use of shortcut keys or "hot" keys. In the described embodiment of the invention, numeric keys 85 comprise such shortcut keys. Each shortcut key can correspond to a respective application icon, so that each shortcut key activates that application icon and its corresponding application program. In the described embodiment, a shortcut key can be used whenever start menu interface 100 is displayed. If the start menu interface is not displayed, the user can first press the start key to display the start menu interface, followed then by one of the shortcut keys.

0048The operating system allows a user to establish the correspondence between shortcut keys and application icons. The user assigns a shortcut key by scrolling to the desired application icon and then pressing and holding the desired shortcut key for a predetermined duration.

0049The application icons are horizontally ordered on the display in accordance with their numeric shortcut keys. For example, the application icon corresponding to shortcut key 1 is presented first, followed by the application icon corresponding to shortcut key 2 and so on. A shortcut field 112 is maintained in the lower right-hand portion of the operator interface to indicate which shortcut key is assigned to the currently focused application icon. When the start menu interface is initially displayed, the icon corresponding to the "1" shortcut key receives the initial focus.

0050The availability of shortcut keys in combination with the timeout feature described above results in an interface that is particularly easy to use, with several ways for a user to activate a particular icon. To initiate the start menu interface, the user presses the "start" key, which automatically puts the focus at the icon having the number "1" shortcut key. The user can then press the "start" key repeatedly to move through the icons in the order of their shortcut keys. Pressing the "start" key four times, for example, moves to the same icon as using the number "4" shortcut key. Alternatively, the user can scroll through the icons in either direction with the horizontal directional navigation keys. Rather than pressing the "enter" key when the appropriate icon is displayed, the user can simply wait for expiration of the timeout, and the application corresponding to the focused icon will be activated. Alternatively, the user can press one of the shortcut keys (after pressing the "start" key) to move directly the corresponding icon, in which case the icon's application will be immediately activated, without waiting for the timeout. These characteristics allows the user to quickly initiate desired applications, often without requiring any significant visual attention. The timeout feature works in a similar way when the system is responding to voice commands. Thus, a user can navigate to a desired icon with voice commands, and that icon will be activated after a predetermined timeout. The user can initiate an application without waiting for the timeout, by speaking an appropriate voice command such as "START CD PLAYER," in which case the CD Player application will be launched immediately.

0051Since there are only ten numeric shortcut keys, only ten icons can correspond to shortcut keys. However, any remaining application icons can also be ordered for purposes of scrolling. These icons will be positioned after (to the right) of the icons corresponding to shortcut keys. The scrolling order is circular, so that these icons can be quickly viewed by pressing the "left" directional navigation key after pressing the "start" key to initiate the start menu. This is a convenient feature that allows even less frequently used applications to be easily accessed.

0052Although operator interface 100 has been described in terms of its visual and functional characteristics, the invention also includes program steps performed by microprocessor 90 and other components of accessory 50. Such program steps include scrolling a plurality of application icons in response to user scroll commands, focusing on any application icon that is scrolled to a fixed focus position, and activating the application corresponding to the focused application icon in response to a user selection command. In accordance with the invention, the start key and the directional navigation keys are interpreted as user scroll commands, while the enter key is interpreted as a selection key for activating application icons and their corresponding application programs.

0053As already mentioned, the operating system of accessory 50 includes APIs for implementing user controls. Such APIs include a control interface having functions that are callable to create and use a visual control as shown in <figref idref="f0003 f0004">Figs. 6-14</figref> for display and entry of user-provided variables.

0054Referring to <figref idref="f0003">Fig. 6</figref>, a visual control 120 such as this has a plurality of text items 122 that can be scrolled vertically using the vertical directional navigation keys 74. The items are scrollable through a fixed, approximately centered, focus position. The focused item is indicated by ballooned text; any text within the focused item is displayed with a larger font than the text of non-focused items. The focused item is also indicated by color highlighting. In the drawings, the focused item is also indicated by underlining. As an optional feature, focused item having text or graphics that does not fit within the width of the control expands to overlie surrounding display items, so that all (or at least more) of the text or graphics can be seen when the item is focused.

0055It should be noted that the particular interface methods available to application programs allow the application programs to customize many aspects of the visual control. For example, the application program can disable the text ballooning feature so that more lines can be displayed in a single control, and can allow the focus to move vertically in situations where that is most convenient for the user. An application can also control the size of the control and can specify that items be scrolled in a circular fashion.

0056The visual control is configurable by an application program to contain any combination of one or more of the following types of items: <ul id="ul0002" list-style="bullet" compact="compact"><li>A selection item that opens a secondary control in response to a user select command.</li><li>An edit item having a variable that is editable in response to a user select command.</li><li>An adjustable item having a variable that is changeable through a series of predefined values in response to user adjustment commands.</li><li>A combination item having a variable that is changeable through a series of predefined values in response to user adjustment commands and that opens a secondary control in response to a user selection command.</li></ul>

0057These different types of items can be combined in a single control. For example, a single scrollable list of items within a particular control can include an edit item, an adjustable item, a selection item, and a combination item.

0058<figref idref="f0003">Fig. 6</figref> illustrates visual control 120 with a selection item 124 scrolled to the focus position. The selection item comprises descriptive text associated with some function. Pressing the "enter" key 76 opens a new control, drills deeper into a menu structure, or performs some action determined by the application program that creates the visual control. An indicator graphic in the form of an enter symbol 126 at the right of selection item 124 indicates that the "enter" key can be pressed in conjunction with this control. In the example of <figref idref="f0003">Fig. 6</figref>, pressing the "enter" key performs a "clear storage" function.

0059<figref idref="f0003">Fig. 7</figref> illustrates a visual control 130 with an adjustable item selected 132. An adjustable item comprises an optional field label and a variable field that can be changed to a limited number of values. In this example, the field label is "Change Storage Size" and the variable field shows "50%". To change the variable field, a user presses the horizontal directional navigation keys. Each time the user presses one of these keys, the value of the adjustable item changes to the next or previous value in a list of values that is defined by the application program that created the control. In the illustrated example, the user presses the "right" arrow key to increment the variable field to "51%", as shown in <figref idref="f0003">Fig. 8</figref>. In other situations, a user might be able to change a value only between "on" and "off" values. Alternatively, it might be possible to change a value between a predefined set of textual values such as names. Indicator graphics 134 at the right of the selection item, comprising arrow symbols, indicate that the horizontal direction navigation keys can be pressed in conjunction with this control.

0060<figref idref="f0004">Fig. 9</figref> illustrates a visual control 140 with an edit item 141 focused. The edit item comprises an optional label ("User Name") as well as alphanumeric text that is specified by a user ("Dan Smith"). Pressing the "enter" key initiates an edit mode, shown in <figref idref="f0004">Fig. 10</figref>, so that the user can specify and edit the text. An "enter" indicator graphic 142 indicates that pressing the "enter" key is an available option. In the embodiment described herein, a spinner control 143 is used to edit the text. When the spinner control is over a symbol, the vertical directional navigation keys can be pressed to change the symbol through a sequence of values such as through the alphabet and through numerals 0-9. The horizontal directional navigation keys can be pressed to move the spinner control horizontally to a different symbol. Pressing the "enter" key exits the editing mode.

0061<figref idref="f0004">Fig. 11</figref> illustrates a visual control 150 with a combination item 151 focused. A combination item has an optional field label ("Sports") and a variable field ("Off"). A user can change the variable between a limited number of predefined values by pressing the horizontal direction navigation keys. In the example of <figref idref="f0004">Fig. 11</figref>, the user can change the variable between "On" and "Off" values. <figref idref="f0004">Fig. 12</figref> shows the result of pressing one of the horizontal direction navigation keys to change the value to "On". The user can also (or alternatively) press the "enter" key to open a secondary control or to perform some other action defined by the application program that created the control. Arrow symbols 153 and an enter symbol 154 at the right of the item indicate that two different actions can be performed on this item: either adjusting with arrow keys or pressing enter for more options. In this case, pressing the "enter" key results in a secondary control 160 as shown in <figref idref="f0004">Fig. 13</figref>, having a plurality of adjustable items allowing the user to toggle values for specific fields.

0062A user can also interact with visual controls such as these through voice commands.

0063Each item can optionally be associated with a graphics image that changes to illustrate values of the item variables. For example, <figref idref="f0004">Fig. 14</figref> shows a visual control 170 having a visual graph 171 that illustrates audio equalization as it is currently configured with controls 172. The exact nature of any such graph or graphic is determined by the application program that creates the various controls.

0064The described menu interface and visual controls provide effective means of interfacing with a user of an automotive accessory such as the one described herein. The described characteristics and features result in an interface that is easy to read and requires only simple actions to control. Furthermore, the described visual control enables a common control format to be used for a variety of data entry situations, while requiring only minimal display space.

0065Although the invention has been described in language specific to structural features and/or methodological steps, it is to be understood that the invention defined in the appended claims is not necessarily limited to the specific features or steps described. Rather, the specific features and steps are disclosed as preferred forms of implementing the claimed invention.

0066The invention is defined by the appended claims only.