JPH04365217A - Tuner - Google Patents

Abstract

PURPOSE:To automatically tune only a channel having signals in a short time by skipping channels having no signals when moving over the service area of a broadcasting station. CONSTITUTION:For a microprocessor 14 for tuning, the geographical data of the service area are inputted from an on-vehicle navigation system 16, and a channel data memory 15 for storing channel data is connected. The channel data memory 15 previously stores the channel data of the channel having signals for each service area. The microprocessor 14 for tuning reads the channel data of the channel having signals in the service area, which is shown by the geographical data from the on-vehicle navigation system 16, from the channel data memory 15 and a tuning circuit 13 executes a tuning operation. Thus, when moving over the service area of the broadcasting station, only the channel having signals is automatically tuned in a short time by skipping the channels having no signals.

Description

[Detailed description of the invention]

[Object of the invention]

0002

[Industrial Field of Application] The present invention relates to a tuning device that is used in radio broadcast receivers, television receivers, etc. and is capable of automatic station searching, particularly when moving beyond the coverage range of a broadcasting station. The present invention relates to a channel selection device that can receive broadcasts in a short time.

0003

[Prior Art] Generally, in systems for receiving radio broadcasts and television broadcasts, there are systems in which the user stores the broadcast channels in memory in advance, and functions that automatically search for channels with broadcast signals (automatic search function). station function)
There are some with This automatic station searching function is particularly useful in portable television receivers. because,
This is because the frequency of broadcast signals differs depending on the region, so if a user transports a television receiver with broadcast channels stored in its memory in advance, the receiving frequency must be changed to match the broadcast signal of that region.

FIG. 2 is a block diagram of a conventional channel selection device used in a television receiver that performs automatic station searching.

As shown in this figure, reference numeral 1 denotes a television receiver, and this television receiver 1 is adapted to receive television broadcast signals through an antenna 2. As shown in FIG. The television broadcast signal received by the antenna 2 is converted into a video intermediate frequency (hereinafter referred to as an IF signal) by the channel selection circuit 3, and then converted into a video signal by a downstream detection circuit (not shown), and then displayed on a cathode ray tube, liquid crystal display, etc. Is displayed. The channel selection circuit 3 raises or lowers the frequency to be received based on the channel selection data from the channel selection microprocessor 4, converts the television broadcast signal into an IF signal, and outputs the signal. When receiving an instruction to tune up or tune down from a keyboard (not shown), the tuning microprocessor 4 supplies the tuner to the tuning circuit 3 while checking the AFT signal that indicates a deviation from the specified frequency of the synchronization signal or IF signal. The reception frequency is raised or lowered by changing the tuning data. Then, the channel selection microprocessor 4
When a synchronization signal is detected and a point where the AFT signal changes sharply is detected, it is determined that a broadcast signal exists, that is, it is determined that it is a signaled channel, and the channel selection data to be supplied to the channel selection circuit 3 is determined. Fix it.

Further, a channel data memory 5 is connected to the channel selection microprocessor 4 for storing channel data. The channel selection microprocessor 4 is
By operating a key input means (not shown), it searches for broadcasting frequencies in order from the lowest frequency (or from the highest frequency) and determines whether all channels are signal channels or non-signal channels. , the channel data resulting from this determination is stored in the channel data memory 5. The channel selection microprocessor 4 reads channel data when performing channel selection, and selects only signal channels, skipping non-signal channels.

[0007] When such a channel selection device is installed in a car, etc., the receiving device has the coverage range of the broadcasting station (
When moving beyond the service area (hereinafter referred to as the service area), the signaled channel and non-signaled channel differ depending on the service area, so please operate the key input means again.
Channel data is re-recorded in the channel data memory 5. As a result, even if the receiving device moves beyond the service area, the channel selection microprocessor 4 can
It is possible to select only signaled channels by skipping non-signaled channels.

However, in such a channel selection device, when the receiving device moves beyond the coverage range of the broadcasting station,
In order to re-record the channel data, a key input means must be operated, which is quite troublesome for the driver of the car. Also, when re-recording channel data, the frequencies that are broadcasting are searched for in order from the lowest frequency (or the highest frequency), so during this period, you may not be able to view the broadcast normally, and the desired broadcast will not be available. It took a long time to receive the message, giving the viewer an unpleasant impression.

[0009]

[Problems to be Solved by the Invention] In the conventional channel selection device described above, when the receiving device moves beyond the service area of the broadcasting station, the operation of re-recording the channel data is quite difficult for the driver of the car. In addition to being troublesome, it takes time to receive the desired broadcast, giving an unpleasant impression to the viewer.

The present invention eliminates the above-mentioned problems and automatically and quickly skips unsignal channels and selects only signal channels when the receiver moves beyond the service area of a broadcasting station. The purpose is to provide a channel selection device that can.

[Configuration of the invention]

0012

[Means for Solving the Problems] A channel selection device according to the present invention includes a channel data memory that stores channel data of signaled channels for each service area, and a service area indicated by geographic data input from an in-vehicle navigation system. a channel selection microprocessor that reads channel data of the signaled channel from the memory and creates tuning data indicating the frequency of the signaled channel; and a channel selection microprocessor that selects the channel signal based on the tuning data from the input broadcast signal. The present invention is characterized by comprising a tuning circuit for selecting a station.

[0013]

[Operation] According to such a configuration, when the receiving device moves beyond the service area of the broadcasting station, the geographic data input from the in-vehicle navigation system indicates the service area to which the receiver has moved, and the receiver moves beyond the service area of the broadcasting station. Since the in-vehicle navigation system reads the channel data of the signaled channel from the memory and creates the tuning data, the tuning circuit can automatically and quickly skip the non-signaled channels and select only the signaled channel. Can be done.

[0014]

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing a case where an embodiment of the channel selection device according to the present invention is applied to a television receiver.

In FIG. 1, reference numeral 11 indicates a television receiver, and this television receiver 11 has an antenna 1.
2 receives a television broadcast signal and also inputs geographic data from an in-vehicle navigation system 16.

The television broadcast signal received by the antenna 12 is converted into an IF signal by the channel selection circuit 13, and converted into a video signal by a subsequent stage detection circuit (not shown), and the video is displayed on a cathode ray tube, liquid crystal display, or the like. Tuning circuit 1
3 is composed of a high frequency amplification stage, a mixing stage, and a local oscillation stage, and outputs an IF signal by mixing a television broadcast signal and a local oscillation signal, and the local oscillation signal of the local oscillation stage is used for tuning. It is controlled by channel selection data from the microprocessor 14. Therefore, the frequency to be received can be increased or decreased based on the tuning data of the tuning microprocessor 14. When the tuning-up or tuning-down instruction is received from a keyboard (not shown), the tuning microprocessor 14 changes the tuning data while checking the AFT signal that indicates a deviation from the specified frequency of the synchronization signal or IF signal. When the receiving frequency in the tuning circuit 13 is raised or lowered, and when a synchronization signal is detected and a point where the AFT signal changes sharply is detected, it is determined that a broadcast signal exists, and the tuning circuit 13 is instructed to perform a tuning operation. Let it happen.

[0018] Furthermore, the channel selection microprocessor 14 includes:
Geographical data of the service area from an on-vehicle navigation system 16 is input, and a channel data memory 15 is connected to store channel data. The channel data memory 15 stores in advance channel data of signaled channels for each service area. The channel selection microprocessor 14 reads the channel data of the signaled channel in the service area indicated by the geographic data from the in-vehicle navigation system 16 from the channel data memory 15, and causes the channel selection circuit 13 to perform a channel selection operation.

[0019] Furthermore, the channel selection device responds to a change of channel in a certain service area or the opening of a new broadcasting station.
The channel data stored in the channel data memory 15 can be reset. That is, the channel data memory 15 can be stored from a low frequency (or from a high frequency) by operating a key input means (not shown) in an area where channel data is to be preset.
Broadcasting frequencies are searched in order, and channel data as a result of determination of a non-signal channel broadcast signal determined by a channel selection microprocessor 14 is stored in place of the previously stored channel data of the region where presetting is performed.

When such a channel selection device is installed in a car and the receiving device moves beyond the coverage range of the broadcasting station, the channel selection microprocessor 14 receives information from the in-vehicle navigation system 16. Geographical data of the region is input, and microprocessor 1 for channel selection is input.
4 determines which service area the area indicated by this geographic data belongs to, reads the channel data of the signaled channel of the determined service area from the channel data memory 15, presets the channel data, and applies the channel data to this channel data. Based on this, the channel selection circuit 13 is caused to perform a channel selection operation.

According to this embodiment, even if the receiving device moves beyond the service area of the broadcasting station, as long as the channel is not changed or a new broadcasting station is opened, the receiving device will be automatically selected according to the moving area. By presetting the channel data of signal channels in the station microprocessor 14, it is possible to skip over non-signal channels and select only signal channels, eliminating the trouble of setting channel data using key input means as in the past. In addition to eliminating the noise, it also takes less time to receive the desired broadcast.

The channel data memory 15 of the embodiment shown in FIG. 1 may be built in the channel selection microprocessor 14. Furthermore, although the receiving device of the embodiment shown in FIG. 1 is applied to a television receiver, it also includes a channel data memory for radio broadcasting and a selection data for creating channel selection data indicating the frequency of the signaled channel of radio broadcasting. By providing a radio broadcast receiver with a station microprocessor, the present invention can also be applied to a radio broadcast receiver.

[0023]

According to the present invention, when a receiving device moves beyond the service area of a broadcasting station, it can automatically and quickly skip over non-signal channels and select only signal channels. The operation of re-recording channel data becomes less troublesome for car drivers, and
It doesn't take long to receive the desired broadcast.

[0024]

[Brief explanation of drawings]

[0025]

FIG. 1 is a block diagram showing an embodiment of a channel selection device according to the present invention.

[0026]

FIG. 2 is a block diagram showing a conventional channel selection device.

[0027]

[Explanation of symbols]

11 Television receiver 12 Antenna 13 Tuning circuit 14 Tuning microprocessor 15 Channel data memory

Claims (1)

[Claims] 1. A channel data memory that stores channel data of a signaled channel for each service area, and reads from the memory channel data of a signaled channel of a service area indicated by geographic data input from an in-vehicle navigation system; It is characterized by comprising a tuning microprocessor that creates tuning data indicating the frequency of a signaled channel, and a tuning circuit that selects a channel signal based on the tuning data from an input broadcast signal. A channel selection device.