Automatic indentification of audio bezel

Abstract: An automatic identification of the features associated with an audio system for a vehicle based on the selection of the associated bezel (14). The audio system includes a printed circuit board (34) having at least one finger pad (30) thereon in communication with a microprocessor (16). The microprocessor (16) includes programming sequences for various possible features for the audio system. The bezel (14) may have no, one or multiple programming tabs (36) in alignment with corresponding finger pads depending upon the model of bezel chosen. Contact of the finger pads due to the programming tabs will indicate to the microprocessor which programming sequence needs to be initiated to activate the appropriate features corresponding to that particular bezel installed on the audio assembly.

Description: The present invention relates to vehicular audio systems and more particularly to audio systems having differing models with multiple functions and corresponding bezels. Such an audio system is known from EP 0 375 128 A, which corresponds to the preamble of claims 1 and 8. Current audio systems are generally designed and manufactured separately according to the particular features available on a specific model. Many of the various functions can now be controlled by software with a microprocessor rather than hardware. Some examples of such functions are station search functions, digital signal processing (DSP) functions, etc. Microprocessor control is possible and preferred in that a change from one set of functions to another is just a matter of a different software download or selection. Existing radio bezels exhibit considerable complexity to account for different functions and to meet various market requirements. A given base model of radio may have several derivatives that have unique features associated with the buttons to implement different features such as clock versions, digital signal processing (DSP) features, noise reduction, etc. These features require unique plastic bezel assemblies with the associated button differences and thus result in high cost in audio systems due to the extra assemblies and manufacturing operations. Consequently, in order to reduce costs, it is highly desirable and current practice to utilize common hardware, including the circuit board and microprocessor software for all radio models in a given product family, with only software variations. Some achieve these objectives by configuring the system so that the circuit board is strapped with resistors or jumpers that are interfaced to the microprocessor. These strapping resistors are configured to identify the configuration (for the particular model) that the microprocessor will run in its internal code to match the model features and bezel assembly. For those who employ this, current practices tie this resistor-configured board assembly to the intended plastic bezel assembly with assembly part numbers, computer tracking methods and bills-of materials. This requires considerable effort to track and maintain the parts and allows for possible errors. Further, the identifying resistors are added parts with associated material and manufacturing costs. Thus, it is desirable to have an audio system which allows for various models with the same hardware, while allowing for different software base features to be changed for a given model of audio system based upon the corresponding model of bezel selected. Preferably, this will be accomplished with minimum cost and complexity concerns. In its embodiments, the present invention contemplates a method for automatically programming an audio assembly for available features corresponding to a particular bezel from among various models of bezels. The method comprises the steps of: providing at least one programming selection indicating means; selecting a particular bezel for the audio assembly; assembling the particular bezel to the audio assembly; detecting whether there is contact with the programming selection indicating means; initiating a first programming sequence corresponding to a selection of the available features if there is contact with the selection indicating means; and initiating a second programming sequence corresponding to second selection of the available features if there is a lack of contact with the programming selection indicating means. The present invention has an advantage that it allows the microprocessor in an audio component to automatically identify the software routines needed for providing features in correspondence with the buttons on a particular bezel based upon the particular bezel assembled to the audio component. A further advantage of the present invention is that the cost of fabrication and assembly is reduced by eliminating some parts and reducing the need for human intervention to account for various model features. The invention will now be described, by way of example, with reference to the accompanying drawings, in which: Fig. 1 is a schematic, partially exploded perspective view of an audio assembly in accordance with first and second embodiments of the present invention; Fig. 2A is a side, schematic view of a radio bezel, mat and circuit board corresponding to the first embodiment of the present invention; and Fig. 2B is a view similar to Fig. 2A corresponding to the second embodiment of the present invention; Fig. 3 is a partially exploded, schematic, perspective view of bezel, switchmat and finger pads in accordance with a third embodiment of the present invention; and Fig. 4 is a flow chart indicating the decision process made when a bezel is assembled to an audio assembly, in accordance with a fourth embodiment of the present invention. Figs. 1 and 2A illustrate an embodiment of the present invention in which an audio component assembly 10 mounts into a casing 12, which in turn, mounts within a vehicle (not shown). The audio assembly 10 may be just a radio or may also have a cassette, compact disk player, etc. Within the audio assembly 10 is a programmable microprocessor 16 which contains code used for operating the hardware of the assembly 10. This code includes various subroutines which address various functions performed by the hardware. While any particular subroutine may or may not be loaded into each audio assembly, the hardware is the same for each audio assembly within a particular family of audio assemblies whether it will perform the particular function or not. In this way, the complexity for fabrication and assembly of components is reduced, thus reducing the cost to produce the audio system. A bezel body 14 mounts to the audio component assembly 10 and includes conventional buttons 18. (Bezel body 14' is also illustrated in Fig. 1, but represents an alternate embodiment, discussed below). A generally conventional elastomeric switchmat 20 is located between the bezel 14 and the casing 12. The switchmat 20 includes conventional conductive pills, not shown, behind each of the buttons 18 to create a contact between the buttons 18 and conventional finger pads, not shown, when the buttons are depressed. In addition, the switchmat 20 includes three conductive pills, 22, 24 and 26. The conductive pills 22, 24, 26 are located so that each aligns with a respective finger pad 28, 30 and 32. These finger pads 28, 30, 32 are, in turn, mounted on a printed circuit board 34 which is in communication with the microprocessor 16. The bezel 14 includes a programming tab 36 extending outward from its back side. This programming tab 36 is aligned with the middle conductive pill 24 so that when the bezel 14 is installed on the casing 12, the conductive pill 24 will be forced into contact with the finger pad 30 and maintain contact indefinitely. This contact of just the middle finger pad 30, with gaps at the other two, will indicate to the microprocessor 16 that a particular programming sequence needs to be initiated, which is associated with this particular model of bezel 14. In order to account for and select the different functions one may wish to include on a particular model of audio assembly, the particular bezel body will have different numbers and locations of programming tabs, or have no tab at all (i.e., just a gap or gaps) to indicate a different particular model. Thus one can have just one tab/pad combination and change between having a programming tab on a first bezel and not having a tab on a second bezel to allow for switching between the two sets of functions for two different models of an audio system. The tab/finger pad combinations will be, of course, in sufficient quantity to offer a unique combination of tabs and gaps for each model of radio bezel. In this way, Figs. 1 and 2B illustrate a second embodiment of the present invention in which a second programming tab 38 extends from the bezel 14' in addition to the other tab 36. For this embodiment, similar elements are similarly designated, but with altered elements having an added prime. The audio component assembly 10, the casing 12, the switchmat 20, the finger pads 28, 30, 32 and the printed circuit board 34 are the same as in the first embodiment. Thus, one assembling the audio system in a vehicle need only determine which model of bezel needs to be installed and once installed, the correct features will be programmed for that model. In this case, the microprocessor 16 will program a different set of functions than in the first embodiment since both the first 36 and second 38 programming tabs cause contact with their respective finger pads 30, 32. The functions programmed, of course, will correspond to the desired functions of the bezel buttons for this second embodiment. Fig. 3 illustrates a third embodiment of the present invention in which the elements illustrated in the second embodiment are the same except that a third programming tab 40 extends from the bezel 14'' in order to illustrate a different possible programming combination. Of course, with up to three possible programming tabs on different models of bezels, one can have up to eight different combinations of programming tabs (or no programming tabs) in order to account for different functions one wishes to provide with a particular model of the audio system. Likewise, one can allow for a system set up with different numbers of finger pads and possible tabs when the initial audio system is designed. For example, one may design the system with just two finger pads and up to two possible programming tabs. In this instance, the possible combinations of different models of bezels and programming combinations is four. Fig. 4 illustrates a flow diagram showing the operation of the initial programming sequence used when one of the four possible bezels is installed on a particular audio assembly. For simplification, it is illustrated for an audio unit with only the option of up to two programming tabs and two associated finger pads. Again, this allows for four combinations of bezel models. The process begins with the selection of the appropriate model of bezel associated with a particular vehicle, shown in block 50. This can be manual or automated selection. The particular model of bezel is, of course, fabricated with the appropriate number and location of programming tabs to match the functions of the buttons on its face. This bezel is then assembled to the audio system, shown in block 52. At this point, the programming tabs, if any, will cause the corresponding conductive pills to contact the associated switchpads, which in turn will signal such to the microprocessor when power is supplied to the audio system. The microprocessor then determines if there is contact with the first finger pad, shown in block 54, or the second finger pad, shown in blocks 56 and 58. If the bezel includes two tabs, causing contact with both of the finger pads, then programming sequence number one is initiated, shown in block 60. If there is contact with the first finger pad, but there is no contact with the second finger pad, then programming sequence number two is initiated, shown in block 62. When there is an indication of no contact with the first finger pad but contact with the second, then programming sequence number three is initiated, shown in block 64. If there is no contact indicated with either finger pad, a condition in which the particular bezel has no extending tabs, then programming sequence number four is initiated, shown in block 66. These different programming sequences activate particular programming subroutines and are unique to a particular model of bezel. Again, these relate to particular functions such as clock versions, digital signal processing, noise reduction, etc. The chosen programming sequence is then stored in memory, shown at block 68. To ensure that no degradation from possible future oxidation will interfere with the intent of the automatic identification, preferably the status is read during original testing at the factory and programmed into non-volatile memory circuits. Although, one may, if desired, choose to initiate the programming sequence each time power is supplied to the audio system. This then ends the initialization process (block 70) and the audio system is properly programmed to provide the functions for the chosen bezel installed in that vehicle. Other alternatives are also possible within the scope of the present invention. For instance, the programming tabs may be movable by the initial installer and so, the programming is set initially and stored in memory at that time. Although, the fixed tabs are more cost effective and easier to ensure proper installation. As a further alternate embodiment, the switchmat may be eliminated as a contact at the location of the programming tabs, with conductive tips located on the tabs, which will directly contact the finger pads to indicate the corresponding bezel installed. Another possibility is that the tuner and the amplifier are mounted remotely from the bezel and cassette player (e.g., in the trunk of a vehicle). With such an arrangement, the signal from the finger pads associated with the programming tabs is transferred back to the microprocessor on the remote components to accomplish the programming function.

Claims: A method of automatically programming an audio assembly for available features corresponding to a particular bezel from among various models of bezels, the method comprising the steps of: providing at least one programming selection indicating means (28,30,32); selecting a particular bezel (14) for the audio assembly; assembling the particular bezel (14) to the audio assembly (10); characterised by detecting whether there is contact with the programming selection indicating means (28,30,32); initiating a first programming sequence corresponding to a selection of the available features if there is contact with the selection indicating means (28,30,32); and initiating a second programming sequence corresponding to second selection of the available features if there is a lack of contact with the programming selection indicating means (28,30,32). A method as claimed in claim 1, wherein the step of providing at least one programming selection indicating means includes providing a least one programming finger pad (28,30,32). A method as claimed in claim 2, wherein the step of providing at least one programming selection indicating means (28) further includes providing at least a second programming finger pad (30), and further includes the steps of initiating a third programming sequence corresponding to contact with the at least one and the second programming finger pads (30), and initiating a fourth programming sequence corresponding to contact with the second programming finger pad (30) but not the at least one finger pad (28). A method as claimed in claim 3, wherein the step of providing at least one selection indicating means further includes providing at least a third programming finger pad, and further includes the step of initiating one of either a fifth, sixth, seventh and eighth programming sequence based upon the contact selected in association with the at least one, second and third programming finger pads. A method as claimed in claim 1, further comprising the step of storing the chosen programming sequence in memory for future reference. A method as claimed in claim 1, wherein the step of selecting a particular bezel includes providing up to one fixed programming tab extending from the bezel, and the step of assembling the particular bezel includes selectively aligning the up to one fixed programming tab with the at least one programming selection indicating means. A method as claimed in claim 6, further comprising the step of providing a switchmat with conductive pills between the bezel and the audio assembly. A method of automatically programming an audio assembly for available features corresponding to a particular bezel from among various models of bezels, the method comprising the steps of: providing at least one programming selection indicating means (28, 30, 32); selecting a particular bezel (14) for the audio assembly; assembling the particular bezel (14) to the audio assembly; characterised by detecting whether there is contact with the programming selection indicating means (28, 30, 32); initiating a first programming sequence corresponding to a selection of the available features if there is contact with the selection indicating means (28, 30, 32); initiating a second programming sequence corresponding to second selection of the available features if there is a lack of contact with the programming selection indicating means (28, 30, 32); and storing the chosen programming sequence in memory. A method as claimed in claim 8, wherein the step of providing at least one program selection indicating means includes providing a first and a second programming finger pad (28, 30, 32). A method as claimed in claim 9, further including the steps of initiating a third programming sequence corresponding to contact with the first and second programming finger pads, and initiating a fourth programming sequence corresponding to contact with the second programming finger pad but not the first programming finger pad.

Inventors: HAMEL GREGORY ROGER, MORALES JORGE, HAMEL, GREGORY ROGER, MORALES, JORGE
Applicants: FORD MOTOR CO, FORD MOTOR COMPANY
Application year: 1998
Main classification: H04B1
IPC codes: H04B1