KR20000004610A - Auto channel selection method about antenna or cable input signal - Google Patents

Abstract

PURPOSE: An auto channel selection method about antenna or cable input signal is provided to automatically select channel by TV without user's operation. CONSTITUTION: The auto channel selection method about antenna or cable input signal comprises: a step(S1) sequentially selecting the channels having frequency bands aligned to a cable TV to check the presence of the broadcast signal about the selected channel and storing the channel and the frequency band if checked; a step(S2) deciding whether or not the channels having the frequency band aligned only to the cable TV are memorized to a memory; a step(S3) selecting other cable channels except the channel aligned only to the cable TV and terminating auto channel selection if the cable channels stored to the memory are one or more; and a step(S4) sequentially selecting channels aligned to antenna TV and terminating auto channel selection if the cable channels stored to the memory don't exist.

Description

Automatic tuning method and apparatus for antenna or cable input signal

The present invention relates to an automatic tuning method and apparatus for an antenna or a cable input signal. Specifically, the present invention relates to an antenna input from an RF signal automatically input through a tuner in a television without a user manually manipulating whether the antenna is input or a cable input. A method and apparatus for automatic tuning for an antenna or cable input signal for determining whether a cable is input and automatically tuning accordingly.

The internal configuration of a general television receiver in FIG. 1 is shown as a block diagram.

As shown in FIG. 1, the TV receiver has an antenna 1, a tuner 2, a data decoder 2 ′, an IF amplifier 3, a P / S separator 4, and a voice detector 5. ), An image detector 6, an audio processor 10, an OSD generator 13, an image processor 14 and a mixer 15, a remote controller 7, a receiver 8, a microcomputer 9, a memory The means includes an E ² PROM 9 ', a voice amplifier 11, a speaker 12, a CRT driver 16, and a CRT 17.

The broadcast signal of the airwave is received by the antenna 1, and the broadcast signal received by the tuner 2 controlled by the microcomputer 9 is tuned. The IF amplifier 3 amplifies an intermediate frequency (IF) signal output from the tuner 2, and the P / S separation unit 4 includes a surface acoustic wave filter to convert the intermediate frequency (IF) into an image intermediate frequency ( PIF) and voice intermediate frequency (SIF).

The voice detector 5 detects a voice signal from the voice intermediate frequency (SIF), and the voice processor 10 detects the detected voice signal based on the control signal of the microcomputer 9 (Base) and Treble. Voice processing such as volume, volume, etc. is performed, and the processed voice signal is amplified by the voice amplifier 11 and output to the speaker 12.

The image intermediate frequency PIF is detected by an image signal in the image detector 6, and the image processor 14 detects the color, tint, brightness, etc. according to the control signal of the microcomputer 9. Processing to output R (Red), G (Green), B (Blue) and luminance (Y) signals corresponding to the image signal, and the R, G, B and luminance (Y) signals are displayed on the OSD in the mixer 15. By mixing and outputting the R ', G', B 'and OSD blanking signals Y' generated from the generator 13, the CRT 17 is driven through the CRT driver 16, and the OSD generator 13 is The image is displayed along with the predetermined OSD pattern data from.

In addition, the remote control device 7 is a device for the viewer to control the output volume, channel switching, etc., or to remotely control the overall device, and transmits an infrared signal and receives it from the receiving unit 8 of the television to convert it into an electrical code signal. By converting and outputting to the microcomputer 9, the overall apparatus is controlled by the microcomputer 9 in accordance with the electrical code signal.

2 shows a block diagram of the simplified configuration of FIG. 1 for automatic tuning of an antenna or cable input signal of a television.

As shown, when the user inputs automatic tuning for the antenna input or automatic tuning for the cable input by the user's remote control operation on the input signal received from the antenna 1 through the tuner 2, the microcomputer 9 ) Controls the tuner 2 and the main IC 20 to be automatically tuned.

But. In the conventional automatic tuning device configured and performed as described above, the user has to check whether the user inputs the antenna input or the cable input by hand, by manipulating the remote control. , Children ..) has a problem that almost can not be used.

Accordingly, the present invention provides an antenna or cable input signal for determining whether the antenna input or the cable input is automatically input from the RF signal input through the tuner and automatically tuned accordingly without the user manually manipulating whether it is the antenna input or the cable input. It is an object of the present invention to provide a method and apparatus for automatic tuning.

1 is a block diagram showing an example of a circuit configuration of a general television receiver;

FIG. 2 is a block diagram schematically showing an example of the configuration of a part related to the automatic tuning function in the circuit of the television receiver; FIG.

3 is a frequency diagram comparing frequency bands of channels by television antennas and channels by cables;

4 is a schematic block diagram of an automatic tuning method for an antenna or cable input signal according to an embodiment of the present invention.

5 is a block diagram showing the configuration of an automatic channel selection apparatus for an antenna or cable input signal according to an embodiment of the present invention.

6 and 7 are detailed flowcharts of an automatic tuning method for an antenna or cable input signal according to an embodiment of the present invention.

* Explanation of symbols on the main parts of the drawings

1: antenna 2: tuner 2 ': data decoder

3: IF amplifier 4: P / S separation part 5: negative detector

6: video detector 7: remote controller 8: receiver

9: Micom 9 ': E ² PROM 10: Voice processing unit

11: audio amplifier 12: speaker 13: OSD generator

14: image processing unit 15: mixer 16: CRT drive unit

17: CRT 20: Main IC 30: Channel Explorer

40: memory 50: microcomputer 60: broadcast signal receiver

In order to achieve the above object, the automatic tuning method for an antenna or cable input signal according to an embodiment of the present invention is a television automatic tuning method for a television antenna or cable input signal: a channel having a frequency band allocated only to a cable TV. Selecting and sequentially checking the presence or absence of a broadcast signal for a frequency band corresponding to the selected channel and storing the channel and the frequency band in a memory if detected; Determining whether channels having a frequency band allocated only to the cable TV in the memory are stored in the memory; Determining that there is at least one cable channel stored in the memory, selecting as a cable TV input, and tuning the remaining cable channels other than the channels allocated only to the cable TV, and ending automatic channel selection; If there are no cable channels stored in the memory, it is determined as an input of the antenna TV and sequentially selects a channel corresponding to the antenna TV and checks the presence or absence of a broadcast signal over a frequency band corresponding to the selected channel to detect a frequency band. And storing the corresponding channel in the memory to terminate the automatic channel selection.

In addition, an automatic tuning apparatus for an antenna or cable input signal, which achieves the object of the present invention, is an automatic tuning apparatus for television for a television antenna or cable input signal: a broadcast signal receiving unit for receiving a broadcast signal through a television antenna or cable ; A main IC for processing a broadcast signal input through the broadcast signal receiver and outputting the speaker and the STI; A channel searcher for checking whether a broadcast signal is present in a frequency band corresponding to a channel selected through a tuner and a data decoder; A memory for storing the channel and the frequency band when a broadcast signal for the frequency band corresponding to the selected channel is detected; When a broadcast signal is input, first select channels having a frequency band allocated only to the cable TV, and then check whether there is a broadcast signal for the frequency band corresponding to the channel, and store the channel and the frequency band in a memory when a broadcast signal is detected. If there is a cable channel stored in the memory, it is judged as a cable input to tune the remaining cable channels other than the channel allocated only to the cable TV to perform automatic channel tuning, or when there is no stored cable channel, it is determined as an antenna TV input. Select the channel corresponding to the antenna TV in turn, check the presence or absence of a broadcast signal over the frequency band corresponding to the selected channel, and store the detected frequency band in memory as a corresponding channel for automatic channel tuning. To control Characterized in that the configuration including yikeom.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In general, 2 channels-96 channels are used as the channel of the television received through the antenna, 1 channel-125 channels are used as the channel received through the cable. FIG. 3 shows a comparison of the frequency bands of the channels received by the television antenna with those of the channels received via the cable.

As shown, there are two channels to 96 channels for a channel by a television antenna, while one channel to 125 channels exist for a channel by a cable television. Accordingly, there are overlapping portions of the frequency bands for each channel, and channels 31, 32, and 33 of cable television exist for frequencies that are not present in the channel by the television antenna. That is, the frequency bands of 91.5 MHz, which correspond to 95 channels of cable television, and 115.25 MHz, which correspond to 99 channels, and 169.25 MHz, which correspond to 121.25 MHz and 22 channels, which correspond to 14 channels, and 23 channels. The frequency bands of 217.25 MHz, corresponding to 217.25 MHz, and 469.25 MHz, corresponding to 65, are frequencies not used for channels by television antennas. The relationship between the channel and the frequency band is stored in a table and stored separately in the memory, and is read and used when checking the frequency band for each channel.

Accordingly, in order to distinguish whether a broadcast signal input through a tuner is a signal from a television antenna or a cable signal, the frequency band corresponding to the cable specific channel is searched and the broadcast signal input through the tuner is connected to the cable specific channel. If there is a corresponding frequency, it is determined by the input by the cable to automatically tune to the cable mode, otherwise it is determined by the television antenna to be a channel to automatically tune.

4 shows each step of the automatic tuning method for an antenna or cable input signal according to the present invention.

As shown in the figure, the search and storage step of the CA TV channel (S1), the step of checking the presence of the CA TV channel in the memory (S2), the automatic channel tuning step (S3) according to the cable input, the automatic channel tuning according to the antenna It is configured to include a step S4.

In the step of searching and storing the CA TV channel (S1), channels having a frequency band allocated only to the cable TV are sequentially tuned to check whether there is a broadcast signal corresponding to the tuned channel, and if there is a channel, the channel is stored in the memory.

Channels assigned to the television antenna (channels 2-69 channels) among the channels assigned to the cable TV (channels 2-69 channels) and only those assigned to the cable TV with distinct frequency bands (95 channels-99 channels, 14 channels-22 channels) , 23 channels-65 channels). Therefore, the channel is first searched for these channels. That is, if a frequency band corresponding to a channel allocated only to the cable TV is present in the broadcast signal, the radio signal is stored in the memory when the broadcast signal is detected, that is, when the broadcast signal is detected. It is determined whether the cable is an input signal according to the existence of the cable channel stored in the memory. If it is determined that the input of the broadcast signal is input by the cable, the channel is tuned to the remaining channels (channels overlapping with the antenna TV) other than the channel allocated only to the cable. When it is determined that the antenna TV input is performed, the channel allocated to the antenna TV is tuned.

In the step S2 of checking whether there is a CA TV channel in the memory, it is determined whether or not channels having a frequency band allocated only to the cable TV are stored in the memory.

If there is at least one cable channel stored in the memory, the automatic channel tuning process according to the cable input (S3) is determined as the cable input to tune the remaining channels other than the channel allocated only to the cable TV and terminate the automatic channel tuning Perform the process.

If there are no cable channels stored in the memory, it is determined that it is not a cable input signal. Therefore, the automatic channel selection process according to the antenna input is determined as an antenna TV input in step S4. Tunes in and checks for the presence or absence of a broadcast signal corresponding to the tuned channel. In other words, tuning is performed in increments of 1 from 2 to 96 channels of the TV antenna channel to search whether there is a frequency band corresponding to the TV antenna channel in the broadcast signal, and the existing channel is stored in a memory to terminate automatic channel tuning. Perform the process.

5 is a block diagram of an automatic channel tuning apparatus for performing each step of the automatic channel tuning method according to the present invention of FIG.

As shown, the broadcast signal receiver 60, the main IC 20, the channel searcher 30, the memory 40, and the microcomputer include the antenna 1, the tuner 2, and the data decoder 2 '. 50).

The broadcast signal receiver 60 composed of an antenna 1, a tuner 2, and a data decoder 2 'receives a broadcast signal through a television antenna or cable.

The main IC 20 processes the broadcast signal input through the broadcast signal receiver 60 under the control of the microcomputer 50 and outputs the same to the speaker and the CALTI.

When the broadcast signal is input through the tuner 2 and the data decoder 2 ', the channel searcher 30 selects channels sequentially to check whether there is a broadcast signal corresponding to the tuned channel.

When a broadcast signal corresponding to a tuned channel exists in the memory 40, the channel and the frequency band are stored.

The microcomputer 50 is configured to play a role of controlling the respective components 20, 30, 40, and 60. That is, when a broadcast signal is input, first, channels having a frequency band allocated only to the cable TV are sequentially tuned to check whether there is a broadcast signal. If there is a broadcast signal for the channel, the channel is stored in the memory 40. When there is a cable channel stored in the memory 40, it is determined as a cable input to tune the remaining channels other than the channel allocated only to the cable TV to terminate automatic channel tuning. If the stored cable channel does not exist, it is judged as the antenna TV input and tunes to the channel corresponding to the antenna TV in turn, and checks the presence or absence of a broadcast signal to store the existing channel in memory for automatic channel tuning. It is configured to play a role of controlling.

When the broadcast signal is input through the tuner 2 and the data decoder 2 ', the channel searcher 30 searches whether a frequency band corresponding to the cable specific channel stored in the memory 40 exists in the broadcast signal.

6 and 7, an embodiment of the automatic tuning method for the antenna or cable input signal according to the above configuration will be described in detail. When tuning of the automatic channel for the broadcast signal input through the tuner starts (101) First, the cable channel selection mode is executed (102). It searches from cable channel 1 to 125 channels, but searches only for the channel assigned to cable only. Then, if it is determined that the cable is input, the search for the remaining channels is performed. To this end, the cable specific channel should be set to the search channel range (14-65, 95-99) (103). Accordingly, the first channel is searched for first, and the first search is made to see if the channel to be searched corresponds to the search channel range (104). If not, the channel is increased by 1 without further processing, and the channel corresponding to the search range is first selected (105). When the search channel corresponding to the search channel range is tuned, if the search channel is smaller than the end channel (125 channels), the channel searcher 30 searches whether the broadcast signal corresponding to the channel exists in the broadcast signal input through the tuner. (106,107). If a corresponding frequency exists, information about the search channel and the frequency band is stored in the memory 40 (108). Thereafter, the process is repeated by 1 for the search channel and the process is repeated until the end channel (109). Then, it is checked whether the cable channel stored in the memory exists (110). If there is a cable channel stored in the memory, it is determined as a cable input to perform the tuning operation for the remaining channels (channels common to the antenna TV channel) other than the channel stored in the memory and terminate the automatic channel tuning. (111, 112).

If the cable channel stored in the memory does not exist, that is, if there is no frequency band corresponding to the unique channel of the cable channel selection process by the television antenna (201). 2 channels as the start channel and 69 as the end channel (202) are sequentially tuned to search for a broadcast signal of a frequency band corresponding to the channel by the TV antenna in the broadcast signal input through the tuner as described above. (204) If there is a broadcast signal, the channel is also stored in the memory (205), and the channel is incremented by 1 (206) to the end channel (203), and then automatic channel selection ends (207).

According to another embodiment of the present invention, the start channel is set to 1 and the end channel is set to 125 in the flowchart shown in FIG. 6, and the search range channels 14 to 65 and 95 to 99 are designated to correspond to the search range. After the steps 103 to 105 are selected for the channel to be tuned, the steps 106 to 109 for tuning the channel are performed, and the search channel ranges 14 to 65 and 95 are stored in the memorized cable channel checking step 110. -99) can be specified.

In another embodiment of the present invention, the start channel is set to 1 and the end channel is set to 125 in the flow chart shown in FIG. 6, and the search range channels 14 to 65 and 95 to 99 are designated. Delete the process of tuning the corresponding channel (103-105), increase the search channel by one channel by setting the start channel of the search channel to 14, and tune to the 65 channels in order and store the information of the channel in the memory. In addition, after performing the above-described steps from 95 to 99 channels, each subsequent process may be performed.

According to the configuration and operation of the automatic tuning method and apparatus for the antenna or cable input signal according to the embodiment of the present invention described above, the user is automatically inputted through the tuner in the TV without manually manipulating whether the antenna input or the cable input is performed. By determining whether it is an antenna input or a cable input from the RF signal, it automatically tunes accordingly to provide an effect of being familiar to a user who is not familiar with the operation of electronic products.

While the embodiments of the present invention have been described in detail with reference to the accompanying drawings, the present invention is not limited thereto, and the present invention may be variously modified and changed without departing from the spirit or the field of the present invention. It will be readily apparent to those of ordinary skill in the art.

Claims (2)

A method for automatic tuning of television to television antenna or cable input signals: Selecting channels having a frequency band allocated only to the cable TV in order to check whether there is a broadcast signal for a frequency band corresponding to the selected channel, and storing the channel and the frequency band in the memory 40 (S1); Determining whether channels having a frequency band allocated only to the cable TV in the memory 40 are stored in the memory 40 (S2); Determining that the cable TV is input when there is at least one cable channel stored in the memory, tuning the remaining cable channels other than the channel allocated only to the cable TV, and terminating automatic channel selection (S3); If there are no cable channels stored in the memory, it is determined as an input of the antenna TV and sequentially selects a channel corresponding to the antenna TV and checks the presence or absence of a broadcast signal over a frequency band corresponding to the selected channel to detect a frequency band. And a step (S4) of storing the corresponding channel in the memory to terminate the automatic channel selection. In the automatic tuning device of a television to a television antenna or cable input signal: A broadcast signal receiver 60 for receiving a broadcast signal through a television antenna or cable; A main IC 20 for processing a broadcast signal input through the broadcast signal receiving unit 60 and outputting the processed signal to the speaker and the CALTI; A channel searcher 30 for checking whether a broadcast signal is present in a frequency band corresponding to a channel selected through the tuner 2 and the data decoder 2 '; A memory 40 in which the channel and the frequency band are stored when a broadcast signal for the frequency band corresponding to the selected channel is detected; When a broadcast signal is input, first, channels having frequency bands assigned to the cable TV are sequentially selected, and if a broadcast signal is detected by checking the presence or absence of a broadcast signal for a frequency band corresponding to the channel, the channel and the frequency band are stored in the memory 40. If the cable channel stored in the memory 40 exists in the memory 40 is judged to be a cable input to tune to the remaining cable channels other than the channel allocated only to the cable TV to perform automatic channel tuning, or if there is no stored cable channel In this case, it selects the channel corresponding to the antenna TV by selecting the antenna TV input and checks the presence or absence of a broadcast signal over the frequency band corresponding to the selected channel, and stores the detected frequency band in the memory to perform automatic channel tuning. Each of the components 20,30,40,6 Automatic tuning device for an antenna or cable input signal, characterized in that it comprises a microcomputer (50) for controlling the 0).