# Patent

## Title
Method for operating a playback unit in a vehicle, for playing back data stored on a data medium

## Abstract

A system for use in a motor vehicle includes a wireless receiver that receives, over a wireless communication channel, supplemental information representative of the characteristics of the contents of a playback media, and provides received supplemental information indicative thereof. A playback device receives the received supplemental information and stores the received supplemental information in a non-volatile memory device. The playback unit may generate a request for supplement information in response to and indicative of a playback media inserted into the playback unit. The system may also include a wireless transmitter that receives the request and transmits the received request over the communication channel. In one embodiment, after the data medium has been inserted into the playback unit, the wireless transmitter (e.g., a car telephone) establishes a radio connection to a data server, and at least part of the characteristic data stored on the inserted data medium are read by the playback unit and are transmitted from the wireless transmitter to the data server, which compares these characteristic data with stored data to identify the data medium. After identifying the data medium, the data server transmits supplemental information to the playback unit, which stores the information in a memory device for on-demand retrieval and display. In another embodiment, a radio connection is established between a computing device and the wireless receiver. The computing device transmits characteristic data of selected data media over the radio connection to the wireless receiver, which provides the received data to the playback unit that stores the received data in a memory device for subsequent on-demand retrieval and display. In this embodiment, an operator can transfer to the motor vehicle the characteristic data stored in the computing device (e.g., personal computer) relating to selected data media.

## Background
BACKGROUND OF THE INVENTION
The present invention relates to the field of multimedia devices for use in a motor vehicle, and in particular to motor vehicle multimedia devices that receive over a wireless connection supplemental information regarding a data medium suitable for playback in the multimedia device.
Motor vehicles are often equipped for example with a car radio, a multimedia player, an audio cassette player, and a car telephone. A combination of car telephone and car radio is often referred to as a telematic unit.
The multimedia data medium stores not only the actual multimedia data, but also a table of contents and other supplementary information. An audio or video CD for example, stores the title of the CD, the music titles stored on it, the beginning or end times, and the size of the stored files. This information can be read when the data medium is inserted into a multimedia player, and can be displayed on a visual display device (e.g., a liquid crystal display).
A problem with prior art systems is that the driver must look away from the road while he is driving in order to enter instructions into the playback unit. Therefore, for safety reasons, the operation of the playback unit should obviously be avoided while operating the motor vehicle.
Therefore, there is a need for a playback unit for use in a motor vehicle that automatically receives supplemental information regarding a data medium suitable for playback in the playback unit.
SUMMARY OF THE INVENTION
Briefly, according to an aspect of the present invention, a multimedia system for use in a motor vehicle includes a wireless receiver that receives, over a wireless communication channel, supplemental information representative of the characteristics of the contents of a playback media, and provides received supplemental information indicative thereof. A playback device receives the received supplemental information and stores the received supplemental information in a non-volatile memory device.
The playback unit may generate a request for supplemental information in response to and indicative of a playback media inserted into the playback unit. The system may also include a wireless transmitter that receives the request and transmits the received request over the communication channel.
In one embodiment, after the data medium has been inserted into the playback unit, the wireless transmitter (e.g., a car telephone) establishes a radio connection to a data server, and at least part of the characteristic data stored on the inserted data medium are read by the playback unit and are transmitted from the wireless transmitter to the data server, which compares these characteristic data with stored data to identify the data medium. After identifying the data medium, the data server transmits supplemental information to the playback unit, which may include more information than the characteristic data stored on the data medium. The received supplemental information is stored in a memory device for on-demand retrieval and display. If the same data medium is placed into the playback unit (e.g., CD player) a second time, its characteristic data are already present in the memory device and can be displayed.
In another embodiment, a radio connection is established between a computing device and the wireless receiver. The computing device transmits characteristic data of selected data media over the radio connection to the wireless receiver, which provides the received data to the playback unit that stores the received data in a memory device for subsequent on-demand retrieval and display. In this embodiment, an operator can transfer to the motor vehicle the characteristic data stored in the computing device (e.g., personal computer) relating to selected data media. For example, a driver remotely located from his motor vehicle (e.g., at home) can conveniently load for example the characteristic data of arbitrary CDs into the memory of his motor vehicle CD player via his personal computer and a wireless communication channel (e.g., a cellular communication channel). The driver does not have to be in, or even be near the motor vehicle for this purpose.
One advantage is that the characteristic data transmitted from the data server to the vehicle can contain much more information about an inserted playback media than is stored on the playback media itself. Depending on the capacity of the memory, the characteristic data of a more or less large number of CDs can be stored. Advantageously, information that supplements/updates information stored on the playback media can be provided to the playback unit over the wireless communication channel.
Notably, displaying the characteristic data automatically after the playback media has been inserted into the playback unit relieves the driver from operating the playback unit.
These and other objects, features and advantages of the present invention will become more apparent in light of the following detailed description of preferred embodiments thereof, as illustrated in the accompanying drawings.



BRIEF DESCRIPTION OF THE DRAWING
The FIGURE is a pictorial illustration of embodiments of the present invention in their operational environment.



DETAILED DESCRIPTION OF THE INVENTION
A motor vehicle 10 includes a wireless transceiver 12 (e.g., a car telephone) and a playback unit 14 (e.g., CD player), which is connected to the wireless transceiver 12. An antenna 16 is connected to the wireless transceiver. The system also includes a data server 20 that communicates via a wireless communication channel 22. A computer 30 and a telephone/modem 32 are situated in the driver's house/office.
After a playback media (e.g., a CD) has been inserted into the playback unit 14, the wireless transceiver 12 transmits characteristic data of the inserted playback media via the antenna 16 to the data server 20. The data server 20 compares the received characteristic data with stored characteristic data resident in the data server, to identify the playback media inserted into the playback unit 14. After this identification, the data server 20 transmits the supplemental characteristic data of the inserted playback media to the vehicle, where the supplemental data are stored in a memory of the playback device 14, and are automatically displayed on a visual display device within the vehicle.
In an alternative embodiment, an operator may initiate the transmission of the supplemental characteristic data associated with selected playback devices from his computer (e.g., PC, laptop computer, PDA, or other computing device) over a wireless communication channel 26 to the wireless transceiver 12. The supplemental characteristic data received by the wireless transceiver 12 are then forwarded to and stored (e.g., in compressed form) in the memory of the playback device 14.
Advantageously, a user may remotely update (e.g., from home) the memory in the motor vehicle playback unit (e.g., the CD player) via the wireless communication channel 26.
The supplemental characteristic data transmitted to the vehicle can provide descriptive characteristic information about the inserted playback media beyond what are stored on the media itself. The supplementary information may include, for example, ID3 tags.
The present invention is clearly not limited to providing supplemental information regarding CDs. Rather, the present invention may be used with other media, such as for example, DVD, memory cards such as for example a memory stick, and other prerecorded data media. The playback units may include for example CD players, DVD players and/or multimedia players.
Although the present invention has been shown and described with respect to several preferred embodiments thereof, various changes, omissions and additions to the form and detail thereof, may be made therein, without departing from the spirit and scope of the invention.

## Claims

1. A method of operating a playback unit suitable for use in a motor vehicle equipped with a wireless telephone that communicates with the playback unit, the method comprising:
transmitting a request for supplemental information indicative of a playback media inserted into the playback unit, from the playback unit to a data server over a wireless communication channel via the wireless telephone; 
receiving at the playback unit supplemental information representative of the characteristics of the contents of the playback media, wherein the supplemental information is transmitted by the data server over the wireless communication channel to the wireless telephone, which forwards the received supplemental information to the playback unit; and 
storing the received supplemental information in a memory device accessible by the playback unit.

2. The method of claim 1, further comprising retrieving the received supplemental information stored in the memory device and displaying the received supplemental information on a motor vehicle display.

3. The method of claim 2, where the step of transmitting a request for supplemental information comprises transmitting a request for supplemental information from a CD player.

4. The method of claim 2, where the step of transmitting a request for supplemental information comprises transmitting a request for supplemental information from a DVD player.

5. The method of claim 2, where the step of transmitting a request for supplemental information comprises transmitting a request for supplemental information from a multimedia player.

6. The method of claim 2, where the step of transmitting a request for supplemental information is performed in response to inserting a memory card data medium into the playback unit.

7. The method of claim 1, where prior to the step of transmitting, checking if supplemental information associated with the data medium is stored in the memory device, and if not performing the step of transmitting.

8. The method of claim 2, where prior to the step of transmitting, checking if supplemental information associated with the data medium is stored in the memory device, and if not performing the step of transmitting.

9. A method of operating an audio playback unit that receives a removable playback memory storage media and plays back audio data located on the removable playback memory storage media, where the audio playback unit is suitable for use in a motor vehicle equipped with a wireless transceiver that communicates with the audio playback unit, the method comprising:
receiving at the audio playback unit supplemental information representative of the characteristics of audio data stored on the removable playback memory storage media, where the supplemental information is transmitted by a computing device over the wireless communication channel to the wireless transceiver, which forwards the received supplemental information to the audio playback unit; and 
storing the received supplemental information in a memory device accessible by the playback unit.

10. The method of claim 9, where the computing device comprises a computer and a modem.

11. The method of claim 10, where the step of receiving comprises receiving the supplemental information encoded in the short-message-services standard (SMS) format.

12. The method of claim 10 where the step of storing comprises storing the received supplemental information in a compressed format in the memory device.

13. A multimedia system for use in a motor vehicle, the system comprising:
a wireless receiver that receives, over a wireless communication channel, supplemental information representative of the characteristics of the contents of a playback media, and provides received supplemental information indicative thereof; 
a non-volatile memory device; 
a playback device that receives the received supplemental information and stores the received supplemental information in the non-volatile memory device.

14. The multimedia system of claim 13, where the playback unit comprises a display device that displays data indicative of the received supplemental information associated with the playback media.

15. The multimedia system of claim 14, comprising means for generating a request for supplemental information indicative of a playback media inserted into the playback unit; and
a wireless transmitter that receives the request and transmits the received request over the wireless communication channel.

16. The multimedia system of claim 14, where the playback unit comprises:
means for checking if the non-volatile memory device includes supplemental information associated with the playback media, and if so, for retrieving the stored supplemental information associated with the playback media and displaying data indicative of the stored supplemental information on the display.

17. The multimedia system of claim 13, where the playback unit comprises means for generating a request for supplemental information in response to and indicative of a playback media inserted into the playback unit; and
a wireless transmitter that receives the request and transmits the received request over the communication channel.