Broadcast positioning systems supporting location services through over-the-air broadcast television (TV) signals are disclosed. The broadcast positioning system supports a broadcast TV signal format that includes a transmission time of the broadcast TV. The transmission time of the broadcast TV signal is used by a TV signal receiver to determine the propagation delay of the broadcast TV signal between the TV signal transmitter and the TV signal receiver. The TV signal receiver is also configured to receive multiple broadcast TV signals from multiple TV broadcasters, wherein the same delay of arrival for those broadcast TV signals can be determined. In this manner, the TV signal receiver can use the determined multiple delays of arrival from the multiple received broadcast TV signals as time-of-arrival (TOA) and the known locations of the antenna radiating these multiple broadcast TV signals to perform a trilateration or multilateration calculation to determine its position.

In one aspect, an example method includes (i) encountering, by a media playback device of a vehicle, a trigger to update a list of currently tunable radio stations; (ii) based on encountering the trigger to update the list of currently tunable radio stations, updating, by the media playback device, the list of currently tunable radio stations using a location of the vehicle and radio station contour data stored in a local database of the media playback device; and (iii) displaying, by the media playback device, a station list using the list of currently tunable radio stations.

In one aspect, an example method includes (i) encountering, by a media playback device of a vehicle, a trigger to update a list of currently tunable radio stations; (ii) based on encountering the trigger to update the list of currently tunable radio stations, updating, by the media playback device, the list of currently tunable radio stations using a location of the vehicle and radio station contour data stored in a local database of the media playback device; and (iii) displaying, by the media playback device, a station list using the list of currently tunable radio stations.

Disclosed is an interactive device for an internet radio station, comprising a content presentation unit and a content selection unit. The content selection unit includes a knob, a selection module, a processing module, an indication module and a communication module. The knob inputs by a user, a channel selection instruction by means of manual rotation; the selection module generates a corresponding electrical signal according to the channel selection instruction; the processing module obtains, according to the electrical signal, a corresponding audio resource from the network radio station and releases the audio resource to the content presentation unit which plays the audio resource. The indication module generates, under the driving of the knob, a state change corresponding to the channel selection instruction. In this way, the user can select the audio resource by rotating the knob, so that the channel selection manner is similar to the traditional radio rotary tuning method.

Disclosed is an interactive device for an internet radio station, comprising a content presentation unit and a content selection unit. The content selection unit includes a knob, a selection module, a processing module, an indication module and a communication module. The knob inputs by a user, a channel selection instruction by means of manual rotation; the selection module generates a corresponding electrical signal according to the channel selection instruction; the processing module obtains, according to the electrical signal, a corresponding audio resource from the network radio station and releases the audio resource to the content presentation unit which plays the audio resource. The indication module generates, under the driving of the knob, a state change corresponding to the channel selection instruction. In this way, the user can select the audio resource by rotating the knob, so that the channel selection manner is similar to the traditional radio rotary tuning method.

Disclosed is a tuner device including an input terminal, a separator, a first amplifier, a second amplifier, and a tuner. The input terminal receives an input of a reception signal of satellite digital broadcasts. The separator is connected to the input terminal and adapted to frequency-separate a first signal and a second signal. The first signal is in a low-frequency domain of the reception signal, and the second signal is in a high-frequency domain of the reception signal. The first and second amplifiers respectively amplify the first and second signals. The tuner receives an input of output signals from the first and second amplifiers.

A broadcast receiver is capable of automatically switching to an applicable frequency of a radio station in a region, and stores plural geocodes related respectively to area blocks of the region, and plural frequencies related the radio station and each corresponding to one of the area codes. The broadcast receiver obtains a geographic coordinate set when a radio signal currently received from the radio station has poor quality. Then, the broadcast receiver converts the coordinate set to a geocode, finds an area code corresponding to the geocode, and receives the radio signal from the radio station on the frequency corresponding to the area code.

A broadcast receiver is capable of automatically switching to an applicable frequency of a radio station in a region, and stores plural geocodes related respectively to area blocks of the region, and plural frequencies related the radio station and each corresponding to one of the area codes. The broadcast receiver obtains a geographic coordinate set when a radio signal currently received from the radio station has poor quality. Then, the broadcast receiver converts the coordinate set to a geocode, finds an area code corresponding to the geocode, and receives the radio signal from the radio station on the frequency corresponding to the area code.

A display device comprises a display component, an output component, a setting component, and a controller. The output component outputs a first signal having guidance information and a second signal having audio information pertaining to content. The setting component performs volume setting. The controller controls output levels of the first signal and the second signal. The controller sets the output level of the first signal to a value that is greater than or equal to the output level of the second signal, and sets the output level of the first signal to a value greater than zero when the output level of the second signal is zero.

A display device comprises a display component, an output component, a setting component, and a controller. The output component outputs a first signal having guidance information and a second signal having audio information pertaining to content. The setting component performs volume setting. The controller controls output levels of the first signal and the second signal. The controller sets the output level of the first signal to a value that is greater than or equal to the output level of the second signal, and sets the output level of the first signal to a value greater than zero when the output level of the second signal is zero.