JP2004166296A - Automatic tuning device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an automatic tuning device which enables the automatic switching of a tuning mode of a tuner circuit and the automatic allocation of various signal information at tuning or after the completion of tuning, and enables a user to automatically allocate various signal information arbitrarily. <P>SOLUTION: The automatic tuning device comprises a SYNC discrimination circuit 11 which discriminates whether a video signal system is an NTSC system or the other system, a tuning mode switching circuit 12 which switches the tuning mode, and a color discrimination circuit 13 which discriminates whether the video signal system is a PAL system or an SECAM system after receiving a color burst signal (ident signal) S8. Since it is not required for the user to set the tuning mode of a tuning means for the NTSC system, the PAL system, the SECAM system and the SECAM-L system, the automatic tuning device not imposing a burden on the user is obtained. <P>COPYRIGHT: (C)2004,JPO

Description

  The present invention relates to an automatic tuning apparatus, and more particularly, to an automatic tuning apparatus for determining a signal system at the time of automatic tuning and processing stored signal information in an automatic tuning apparatus of a VTR.

  A conventional automatic tuning apparatus for a VTR (VIDEO TAPE RECORDER) will be described with reference to FIGS. FIG. 51 is a block diagram of a main part of a conventional VTR automatic tuning apparatus, and FIG. 52 is a flowchart of its operation. FIG. 53 shows a relationship between a station number at the time of tuning (a convenient broadcast station number) and a position number after the tuning is completed (a convenient number on a VTR device for selecting a broadcast station).

  In FIG. 51, reference numeral 2 denotes a tuner circuit that can be switched according to a video signal system by an external control signal, and 3 denotes a synchronization signal (SYNCHRONIZING SIGNAL :) which receives a composite video signal S1 from the tuner circuit 2 and performs signal processing. A video signal processing circuit including a separation circuit (abbreviated as Y / C in the figure), an AFT detection circuit 4 for detecting the presence or absence of a broadcasting station based on a received signal from the tuner circuit 2, a tuning control circuit 5, Reference numeral 6 denotes a memory circuit, which comprises a tuning control circuit 5 and a memory circuit 6, and constitutes a system controller 7. Reference numeral 8 denotes an input signal mode changeover switch for switching the operation of the tuning control circuit 5 in accordance with the input signal transport mode.

  Next, the operation will be described with reference to FIGS. 52 and 53. First, the operation of automatic tuning (hereinafter referred to as auto tuning) will be described with reference to the flowchart of FIG. When the system controller 7 receives a command of automatic tuning (hereinafter referred to as auto tuning) from the user, the tuning mode of the tuner circuit 2 is set to the PAL system as an initial setting, and the address of the memory of the memory 6 is changed to the station number “0”. (Step ST1).

  Next, a tuning control signal S3 is sent to the tuner circuit 2 to control the tuning frequency to be increased by a certain amount (step ST2).

  At this time, the video signal processing circuit 3 separates the AFT (AUTOMATIC FINETUNING: automatic fine tuning) signal S4, which is the output of the AFT detection circuit 4, from the AFT detection circuit 4 in order to detect the presence or absence of a broadcasting station transmitting the signal of that frequency. The SYNC signal S2 indicating the presence or absence of the received signal is input to the tuning control circuit 5 to make a determination (step ST3).

  At this point, if both the AFT signal S4 and the SYNC signal S2 are given, the tuning control circuit 5 determines that the signal from the broadcasting station has been received, and stores the tuning data at that time in the station number "0" in the memory 6. (Step ST4). Here, the tuning data indicates data relating to frequency.

  Subsequently, in order to store the next tuning data, the address of the memory 6 is incremented by one, and the next tuning operation is performed as the station number "1" (step ST5).

  On the other hand, when neither the AFT signal S4 nor the SYNC signal S2 is given, it is determined whether or not the current frequency has reached the upper limit of the tuning frequency, that is, whether or not the tuning has been completed (step ST6). If the frequency at this time has reached the upper limit of the tuning frequency, the tuning is terminated. If not, the operation of step ST2 is performed again. The operations of steps ST2 to ST6 are repeated, and when the upper limit of the tuning frequency is reached, the tuning ends.

  The tuning data obtained by the tuning is supplied from the address in the memory 6 to the system for channel selection, a position number for channel selection is assigned, and the tuning mode ends.

  The result obtained by the above-described auto tuning is shown in FIG. FIG. 53 shows the station number of the address in the memory 6 and the tuning data stored therein, and shows the relationship between the station number and the position number for channel selection.

  In FIG. 53, station numbers “0” to “3” store frequency data corresponding to the transmission frequencies of “station B”, “station D”, “station C”, and “station A” as tuning data, respectively. It indicates that. On the other hand, station numbers “4” to “99” indicate that no data to be stored exists, that is, that no broadcast station exists.

  These correspond to the transmission frequencies of "station B", "station D", "station C", and "station A" in the position numbers "0" to "3" in the system for channel selection. Frequency data is stored, and position numbers "4" to "99" are skipped because there is no need to read data.

  The user can use the channel selection system of the VTR from the time of finishing the auto tuning, and can obtain a tuned signal by selecting a switch corresponding to the position number. However, in the auto tuning, since the tuning operation is performed only for the signal transmitted by the PAL method, the signal transmitted by the transmission method other than the PAL method cannot be obtained. When it is desired to tune a signal of a transmission system other than the PAL system, the input signal system changeover switch 8 connected to the tuning control circuit 5 is switched so that the tuning control circuit 5 outputs a control signal SCON for switching the input signal system to the tuner. To the circuit 2.

  Since the conventional automatic tuning apparatus is configured as described above, the transmission method of the input signal is set to the PAL method by default, and when the signal of the transmission method other than the PAL method is tuned, the automatic signal is transmitted. After the tuning is completed, there is a problem that the user must manually switch the input signal mode changeover switch 8 to perform the re-tuning.

  At the time of auto-tuning, only data related to the frequency is stored.Therefore, there is no data on the audio signal system or video signal system that differs depending on the type of broadcast station tuned, the strength of the signal, and the country. However, there is a problem that the user is forced to select a position due to these differences.

  The present invention has been made in order to solve the above problems, and automatically switches the tuning mode of the tuner circuit in accordance with the audio signal system and the video signal system, at the time of tuning or after completion of tuning. Automatic tuning that can automatically arrange various signal information according to the preset position number or automatically arrange various signal information according to the position number desired by the user The aim is to obtain a device.

  An automatic tuning apparatus according to claim 1 of the present invention includes a tuning unit that tunes and selects a predetermined channel from a broadcast wave including at least a video signal, and receives the video signal output from the tuning unit and converts the received video signal into the video signal. Video signal processing means for separating the included synchronizing signal, AFT detecting means for detecting the presence or absence of a broadcasting station based on the received signal from the tuning means, and the synchronizing signal from the video signal processing means and the AFT from the AFT detecting means An automatic tuning apparatus comprising: a tuning control unit that receives a signal and controls a tuning operation of the tuning unit; and a storage unit that is connected to the tuning control unit and stores at least data on a tuning frequency of the tuning unit. Receiving the video signal output from the tuning means, detecting random noise contained in the video signal, and outputting the same as noise data That includes a noise detection means, through said tuning control means, and to store the noise data in said memory means together with data related to the tuning frequency.

  According to the automatic tuning apparatus according to the first aspect of the present invention, by storing the noise data in the storage means together with the data on the tuning frequency, the reception status of the broadcast radio wave can be adjusted as needed during the automatic tuning and after the end of the automatic tuning. You can know.

  An automatic tuning apparatus according to claim 2 according to the present invention includes a tuning unit that tunes and selects a predetermined channel from a broadcast wave including at least a video signal, and receives the video signal output from the tuning unit and converts the received video signal into the video signal. Video signal processing means for separating the included synchronizing signal, AFT detecting means for detecting the presence or absence of a broadcasting station based on the received signal from the tuning means, and the synchronizing signal from the video signal processing means and the AFT from the AFT detecting means An automatic tuning apparatus comprising: a tuning control unit that receives a signal and controls a tuning operation of the tuning unit; and a storage unit that is connected to the tuning control unit and stores at least data on a tuning frequency of the tuning unit. Receiving the video signal output from the tuning means, detecting the signal quality of the video signal, and outputting signal quality data Comprising a stage, through the tuning control unit, and to store the signal quality data to said storage means together with the data related to the tuning frequency.

  According to the automatic tuning apparatus according to the second aspect of the present invention, the reception status of broadcast radio waves including not only simple noise but also interfering radio waves and ghost radio waves as needed during and after automatic tuning. You can know.

  The automatic tuning apparatus according to claim 3 according to the present invention includes a tuning unit that tunes and selects a predetermined channel from a broadcast wave including at least a video signal, and receives the video signal output from the tuning unit and converts the received video signal into the video signal. Video signal processing means for separating the included synchronizing signal, AFT detecting means for detecting the presence or absence of a broadcasting station based on the received signal from the tuning means, and the synchronizing signal from the video signal processing means and the AFT from the AFT detecting means An automatic tuning apparatus comprising: a tuning control unit that receives a signal and controls a tuning operation of the tuning unit; and a storage unit that is connected to the tuning control unit and stores at least data on a tuning frequency of the tuning unit. Receiving the video signal output from the tuning means, determining the video quality of the video signal, and displaying the determination result as video quality information Sorting control to automatically give the image quality degree determining means to be given to the tuning control means, and storage contents including at least data on a tuning frequency of the tuning means stored in the storage means in accordance with a predetermined rule. Means for storing the image quality information together with the data on the tuning frequency in the storage means via the tuning control means, and storing the image quality information and the corresponding data on the tuning frequency in the image. It is characterized in that it is automatically rearranged in order of good quality.

  According to the automatic tuning apparatus of the third aspect of the present invention, the image quality information is stored in the storage means together with the data relating to the tuning frequency via the tuning control means, and the image quality information and the corresponding tuning frequency are stored. By automatically rearranging the data in descending order of the video quality, the user does not need to set the calling number in correspondence with the descending order of the video quality.

  The automatic tuning device according to claim 4, wherein the video quality determination unit receives the video signal output from the tuning unit and detects a video quality detection unit that detects a signal quality of the video signal. And the video quality information is a video quality signal output from the video quality detection means as a determination result.

  According to the automatic tuning apparatus of the fourth aspect of the present invention, the video quality determining means has a video quality detecting means for receiving the video signal output from the tuning means and detecting the signal quality of the video signal. Since the image quality information is used as the image quality signal output as the determination result, it is possible to determine the image quality including not only simple noise but also interfering radio waves and ghost radio waves.

  According to the automatic tuning device according to the first aspect of the present invention, it is possible to know the reception status of the broadcast wave as necessary during the automatic tuning and after the automatic tuning is completed. can get.

  According to the automatic tuning apparatus according to the second aspect of the present invention, the reception status of broadcast radio waves including not only simple noise but also interfering radio waves and ghost radio waves as needed during and after automatic tuning. , An automatic tuning device that is easy for the user to use can be obtained.

  According to the automatic tuning apparatus according to the third aspect of the present invention, the user does not need to set a call number or the like in correspondence with the order of good image quality, so that there is no need for an automatic load that does not burden the user. A tuning device is obtained.

  According to the automatic tuning apparatus according to the fourth aspect of the present invention, not only simple noise, but also image quality can be determined including jamming radio waves, ghost radio waves, and the like. A device is obtained.

<First embodiment>
FIG. 1 shows the configuration of a VTR automatic tuning apparatus A1 as a first embodiment according to the present invention. In FIG. 1, reference numeral 2A denotes a tuner circuit connected to the antenna 1, 3 denotes a video signal processing circuit including a SYNC separation circuit which receives a composite video signal S1 from the tuner circuit 2A and performs signal processing, and 4 denotes a tuner circuit 2A. An AFT detection circuit for receiving the received signal and detecting the presence or absence of a broadcasting station; 5, a tuning control circuit for controlling the tuning operation of the tuner circuit 2A; 6, a memory circuit connected to the tuning control circuit; The system controller 7 includes the memory circuit 6. Reference numeral 10 denotes a text data decoder circuit which receives the video signal S 1, extracts a teletext signal S 5, which is information from a broadcasting station, from the video signal S 1, and supplies the teletext signal S 5 to the tuning control circuit 5.

  Next, the configuration of the text data decoder circuit 10 will be described with reference to FIG. 2, a text data decoder circuit 10 includes a blanking detection circuit 101 and a blanking gate circuit 102 to which a video signal S1 is supplied, and a text data detection circuit 103 connected to the blanking gate circuit 102 and outputting a teletext signal S5. It consists of.

  Next, the operation will be described. The blanking detection circuit 101 detects a portion near the synchronization signal of the video signal S1 where there is no real signal such as a video (vertical retrace period) and supplies the blanking signal S101 to the blanking gate circuit 102. From the video signal S1 supplied to the blanking gate circuit 102, only a portion having no real signal such as a video near the synchronizing signal is taken out in accordance with the blanking signal S101, and supplied to the text data detection circuit 103. In the circuit 103, the text data included in that portion is read and output as a teletext signal S5.

  Next, the operation of the automatic tuning apparatus A1 will be described with reference to the flowchart shown in FIG. When the system controller 7 receives an auto tuning command from the user, the tuning mode of the tuner circuit 2A is set to the PAL system as an initial setting, and the address of the memory of the memory 6 is set to the station number "0" (step ST1). ).

  Next, a tuning control signal S3 is sent to the tuner circuit 2A to control the tuning frequency to be increased by a fixed amount (step ST2). At this time, an AFT (AUTOMATIC FINE TUNING: automatic fine tuning) signal S4 output from the AFT detection circuit 4 and a video signal processing circuit 3 are used to detect the presence or absence of a broadcasting station transmitting the signal of that frequency. The SYNC signal S2 indicating the presence or absence of the separated signal is input to the tuning control circuit 5, and a determination is made (step ST3).

  At this point, if both the AFT signal S4 and the SYNC signal S2 are given, the tuning control circuit 5 determines that the signal from the broadcasting station has been received, and stores the tuning data (data related to the frequency) at that time in the memory 6. It is stored at the address of the station number "0" (step ST4).

  At the same time, the text data decoder circuit 10 decodes the text information superimposed during the signal blanking period from the composite video signal S 1, and sends the decoded teletext (teletext) signal S 5 to the tuning control circuit 5. It is input (step ST5).

  The tuning control circuit 5 extracts the broadcast station information from the teletext signal S5 and stores it at the address of the station number "0" in the memory 6 in the same manner as the data on the frequency (step ST6).

  Then, in order to store the next tuning data, the address of the memory 6 is incremented by one, and the next tuning operation is performed as the station number "1" (step ST7).

  On the other hand, in step ST3, when neither the AFT signal S4 nor the SYNC signal S2 is given, it is determined whether the current frequency has reached the upper limit of the tuning frequency, that is, whether or not tuning has been completed (step ST8). ). If the frequency at this time has reached the upper limit of the tuning frequency, the tuning is terminated. If not, the operation of step ST2 is performed again, and the operations of steps ST2 to ST7 are repeated. To end.

  The tuning data obtained by the tuning is supplied from the address in the memory 6 to the system for channel selection, a position number for channel selection is assigned, and the tuning mode ends.

  The automatic tuning apparatus A1 of the VTR according to the present invention includes the text data decoder circuit 10, and the memory 6 of the system controller 7 stores the broadcast station information together with the data on the frequency. Later, the broadcast station can be determined using the teletext signal S5 as the broadcast station information.

  Note that, in the automatic tuning apparatus A1, an example has been shown in which the tuning control circuit 5 extracts the broadcast station information from the teletext signal S5. However, information other than the broadcast station information may be used. You may memorize it. As an example, the state of the received electric field may be determined by calculating the error rate of the text data.

  In the automatic tuning apparatus A1, the data on the frequency and the teletext signal are stored only during the auto-tuning operation. After the auto-tuning is completed, the teletext signal of the video signal received at the present time is stored in the system controller 7. May be compared with the data at the time of auto-tuning, or the data may be updated. This makes it possible to cope with a change in the received electric field or a change in the broadcast station after the auto tuning.

  In the automatic tuning apparatus A1, the presence or absence of a broadcasting station in the auto tuning operation is determined by inputting both the AFT signal S4 and the SYNC signal S2 to the system controller 7. For example, the presence or absence of the teletext signal S5 is determined. Only the AFT signal S4 or the SYNC signal S2 may be used.

  If there is a broadcasting station that does not have the teletext signal S5 among the receiving stations, the system controller 7 can store that fact.

  In the above automatic tuning apparatus A1, the example in which the frequency is increased from the lower frequency to the higher frequency has been described, but the automatic tuning operation may be performed from the higher frequency to the lower frequency. Further, when there are various frequency bands (BAND) such as VHF and UHF, tuning may be performed from any frequency band, tuning may be performed only for a specific frequency band, or the tuning direction may be changed for each frequency band. .

  The tuning control signal S3 output from the tuning control circuit 5 is a DC voltage, a PWM pulse, or serial data.

<Second embodiment>
FIG. 4 shows the configuration of a VTR automatic tuning apparatus A2 as a second embodiment according to the present invention. In FIG. 4, instead of the text data decoder circuit 10 of the automatic tuning apparatus A1 shown in FIG. 1 as the first embodiment, a noise detection circuit 20 for detecting the amount of noise of the received signal and outputting it as noise data S6 is provided. Have been. Note that the same components as those of the automatic tuning device A1 shown in FIG. 1 are denoted by the same reference numerals, and redundant description will be omitted.

  Next, the configuration of the noise detection circuit 20 will be described with reference to FIG. 5, the noise detection circuit 20 includes an inversion delay circuit 201 that inverts and delays the video signal S1, and a noise amplification circuit 202 that receives the video signal S1 and the inverted delay signal S201 of the video signal S1 and amplifies noise. Have been. The inversion delay circuit 201 is provided in parallel with the video signal line, gives a delay (64 μs) for one horizontal scanning period (hereinafter abbreviated as 1H), inverts it, and gives it to the video signal S1 as an inversion delay signal S201.

  Since the video signal S1 has a correlation every 1H, when the inverted delay signal S201 is given, the video signal S1 itself disappears, and only random noise remains. The noise data S6 is obtained by amplifying the random noise by the noise amplifier circuit 202.

  Next, the operation of the automatic tuning apparatus A2 will be described with reference to the flowchart shown in FIG. When the system controller 7 receives an auto tuning command from the user, the tuning mode of the tuner circuit 2A is set to the PAL system as an initial setting, and the address of the memory of the memory 6 is set to the station number "0" (step ST1). ).

  Next, a tuning control signal S3 is sent to the tuner circuit 2A to control the tuning frequency to be increased by a fixed amount (step ST2).

  At this time, in order to detect the presence or absence of a broadcasting station transmitting the signal of that frequency, an AFT signal S4 output from the AFT detection circuit 4 and a SYNC indicating the presence or absence of the signal separated by the video signal processing circuit 3 are provided. The signal S2 is input to the tuning control circuit 5 to make a determination (step ST3).

  At this point, if both the AFT signal S4 and the SYNC signal S2 are given, the tuning control circuit 5 determines that the signal from the broadcasting station has been received, and stores the tuning data (data related to the frequency) at that time in the memory 6. It is stored at the address of the station number "0" (step ST4).

  At the same time, the noise data S6 output from the noise detection circuit 20 is input to the tuning control circuit 5 (step ST5).

  In the tuning control circuit 5, the noise data S6 is stored at the address of the station number "0" in the memory 6 in the same manner as the data on the frequency (step ST6).

  Then, in order to store the next tuning data, the address of the memory 6 is incremented by one, and the next tuning operation is performed as the station number "1" (step ST7).

  On the other hand, in step ST3, when neither the AFT signal S4 nor the SYNC signal S2 is given, it is determined whether the current frequency has reached the upper limit of the tuning frequency, that is, whether or not tuning has been completed (step ST8). ). If the frequency at this time has reached the upper limit of the tuning frequency, the tuning is terminated. If not, the operation of step ST2 is performed again, and the operations of steps ST2 to ST7 are repeated. To end.

  The tuning data obtained by the tuning is supplied from the address in the memory 6 to the system for channel selection, a position number for channel selection is assigned, and the tuning mode ends.

  The automatic tuning apparatus A2 of the VTR according to the present invention includes the noise detection circuit 20, and the memory 6 of the system controller 7 stores the noise data S6 as the reception status information together with the frequency-related data. At the time and after the operation is completed, it is possible to know the reception status of the receiving station, and to perform comparison with other receiving stations and determination of the received electric field.

  The automatic tuning apparatus A2 described above has a configuration in which the noise detection circuit 20 includes the noise amplifier 202 that amplifies noise in the general amplitude direction and detects the amount of noise with respect to the composite video signal S1. A means for detecting the noise level of the audio signal instead of the noise amplifier 202, a means for detecting the noise level of the video signal or the audio signal before demodulation, or an RF-AGC (the sensitivity of the tuner system which is changed by the received electric field). A means for detecting the level of an Automatic Gain Control (Synchronous Gain Control) which detects the edge of the SYNC signal S2 and calculating the S / N ratio of the edge of the SYNC signal S2, or a means for detecting only the vertical synchronizing signal, A means for detecting the S / N ratio may be used.

  In the automatic tuning apparatus A2, the frequency data and the noise data are stored only during the auto tuning operation. However, after the auto tuning is completed, the noise data of the video signal received at the present time is stored in the system controller 7. Then, comparison with data at the time of auto-tuning, update of data, and the like may be performed. This makes it possible to cope with a change in the received electric field or a change in the broadcast station after the auto tuning.

  Also, in the automatic tuning apparatus A2, the example in which the frequency is increased from the lower frequency to the higher frequency has been described. However, the automatic tuning operation may be performed from the higher frequency to the lower frequency. Further, when there are various frequency bands (BAND) such as VHF and UHF, tuning may be performed from any frequency band, tuning may be performed only for a specific frequency band, or the tuning direction may be changed for each frequency band. .

  The tuning control signal S3 output from the tuning control circuit 5 is a DC voltage, a PWM pulse, or serial data.

<Third embodiment>
FIG. 7 shows the configuration of an automatic tuning apparatus A3 for a VTR as a third embodiment according to the present invention. 7, a video quality detection circuit 30 is provided instead of the text data decoder circuit 10 of the automatic tuning apparatus A1 shown in FIG. 1 as the first embodiment. Note that the same components as those of the automatic tuning device A1 shown in FIG. 1 are denoted by the same reference numerals, and redundant description will be omitted.

  Here, the video quality detection circuit 30 will be described. FIG. 8 is a block diagram showing the configuration of the video quality detection circuit 30. In FIG. 8, reference numeral 301 denotes a blanking detection circuit that detects a blanking portion where there is no actual signal in the video signal S1 output from the tuner circuit 2A, and reference numeral 302 denotes a blanking signal S301 detected by the blanking detection circuit 301. Is a blanking gate circuit for passing the video signal S1 through a blanking portion, and 303 is a noise detection circuit for detecting a noise component of only the blanking portion. The noise detection circuit 303 outputs video quality data S7 that is proportional to the amount of noise in a blanking portion of the video signal S1 where no real signal exists.

  Next, the operation will be described. First, the blanking detection circuit 301 detects a blanking portion of the obtained video signal S1, and outputs a blanking signal S301 corresponding to the blanking portion. Further, the video signal S1 opens and closes a gate in response to a blanking signal S301, and only a blanking portion is extracted by a blanking gate circuit 302 that passes only a blanking portion. Only noise detection is performed. As described above, by using the noise detection output of only the blanking portion of the video signal S1 as the video quality data S7 of the received signal, it is possible to detect the presence or absence of a disturbing signal and the like in addition to the simple noise detection. The determination can be made, and the quality of the received signal can be accurately determined.

  Next, the operation of the automatic tuning apparatus A3 will be described with reference to the flowchart shown in FIG. When the system controller 7 receives an auto tuning command from the user, the tuning mode of the tuner circuit 2A is set to the PAL system as an initial setting, and the address of the memory of the memory 6 is set to the station number "0" (step ST1). ).

  Next, a tuning control signal S3 is sent to the tuner circuit 2A to control the tuning frequency to be increased by a fixed amount (step ST2). At this time, in order to detect the presence or absence of a broadcasting station transmitting the signal of that frequency, an AFT signal S4 output from the AFT detection circuit 4 and a SYNC indicating the presence or absence of the signal separated by the video signal processing circuit 3 are provided. The signal S2 is input to the tuning control circuit 5 to make a determination (step ST3).

  At this point, if both the AFT signal S4 and the SYNC signal S2 are given, the tuning control circuit 5 determines that the signal from the broadcasting station has been received, and stores the tuning data (data related to the frequency) at that time in the memory 6. It is stored at the address of the station number "0" (step ST4).

  At the same time, the video quality detection circuit 30 detects the video quality of the composite video signal S1 received at this time, outputs it as video quality data S7, and gives it to the tuning control circuit 5 (step ST5).

  The image quality data S7 is stored at the address of the station number "0" in the memory 6 like the data on the frequency (step ST6).

  Then, in order to store the next tuning data, the address of the memory 6 is incremented by one, and the next tuning operation is performed as the station number "1" (step ST7).

  On the other hand, when neither the AFT signal S4 nor the SYNC signal S2 is given, it is determined whether the current frequency has reached the upper limit of the tuning frequency, that is, whether or not tuning has been completed (step ST8). If the frequency at this time has reached the upper limit of the tuning frequency, the tuning is terminated. If not, the operation of step ST2 is performed again.

  The operations of steps ST2 to ST7 are repeated, and when the upper limit of the tuning frequency is reached, the tuning ends. The tuning data obtained by the tuning is supplied from the address in the memory 6 to the system for channel selection, a position number for channel selection is assigned, and the tuning mode ends.

  The automatic tuning apparatus A3 of the VTR according to the present invention includes the video quality detection circuit 30, and the video quality data S7 is stored in the memory 6 of the system controller 7 as the reception status information together with the frequency data. At the time of the tuning operation and after the operation is completed, the reception status of the receiving station can be known, and further, comparison with another receiving station and determination of the received electric field can be performed.

  In the automatic tuning apparatus A3 described above, the image quality detection circuit 30 detects the noise component of only the blanking portion of the video signal S1 using the noise detection circuit 303. A means for detecting a video intermediate frequency signal (hereinafter referred to as a VIF signal) may be used, or a means for detecting at an RF-AGC level may be used.

  In the automatic tuning apparatus A3, the data relating to the frequency and the video quality data are stored only during the auto tuning operation. However, after the auto tuning is completed, the video quality data of the video signal currently received is stored in the system controller 7. May be compared with the data at the time of auto-tuning, or the data may be updated. This makes it possible to cope with a change in the received electric field or a change in the broadcast station after the auto tuning.

  In the automatic tuning apparatus A3, the example of increasing the frequency from the lower frequency to the higher frequency has been described. However, the automatic tuning operation may be performed from the higher frequency to the lower frequency. Further, when there are various frequency bands (BAND) such as VHF and UHF, tuning may be performed from any frequency band, tuning may be performed only for a specific frequency band, or the tuning direction may be changed for each frequency band. .

  The tuning control signal S3 output from the tuning control circuit 5 is a DC voltage, a PWM pulse, or serial data.

<Fourth embodiment>
FIG. 10 shows the configuration of a VTR automatic tuning apparatus A4 as a fourth embodiment according to the present invention. In FIG. 10, a character generator circuit (hereinafter, referred to as a CG circuit) 40 for superimposing data on the video signal S1 is connected to the video signal processing circuit 3 to display characters and the like on the screen. The output is given to a video signal output terminal 9. The other configuration is the same as that of the automatic tuning device A1 shown in FIG. 1 as the first embodiment. The same components as those of the automatic tuning device A1 are denoted by the same reference numerals, and overlapping description will be omitted.

  Next, the operation of the automatic tuning device A4 will be described. When a command for auto tuning is received from the user, a tuning operation similar to that of the automatic tuning apparatus A1 is performed in accordance with the flowchart shown in FIG. 3, and a text data decoder circuit 10 is used to convert a received broadcast station signal into a teletext signal. Step S5 is taken out and the broadcast station information is stored in the memory 6 of the system controller 7 together with the data on the frequency.

  Then, when the broadcast station information is read out from the memory 6 together with the data on the frequency again after the completion of the auto tuning, the broadcast station information is superimposed on the video signal through the CG circuit 40 and displayed on the image receiving screen.

  The CG circuit 40 is a circuit composed of a ROM, and stores characters, symbols, and the like formed of a predetermined matrix of dots. Since the configuration is general and well known, a detailed description is omitted.

  FIG. 11 shows an example of displaying broadcast station information on the receiving screen SC. In FIG. 11, the name of the currently receiving broadcasting station is indicated as “BBC1” on the receiving screen SC. This allows the user to know the received broadcast station information.

  In this embodiment, the broadcast station information is output to the image receiving screen after the completion of the auto tuning, but may be displayed at the time of the auto tuning. Instead of outputting the image on the image receiving screen, for example, a fluorescent display tube, a light emitting diode, a liquid crystal display, or the like may be provided in a portion outside the image receiving screen, and the broadcast station information may be displayed using these.

  Further, in the automatic tuning apparatus A4 shown in FIG. 10, since the teletext signal S5 is extracted from the broadcast station signal using the text data decoder circuit 10, the screen display content is broadcast station information. By providing a noise detection circuit 20 for detecting the amount of noise of the reception signal described in the second embodiment, for example, instead of the data decoder circuit 10, the noise data S6 output from the noise detection circuit 20 is stored in the memory 6 together with the data on the frequency. As a result, the noise data 106 can be read from the memory 6 as necessary and displayed on the image receiving screen.

  FIG. 12 shows an example of displaying noise data on the image receiving screen SC. In FIG. 12, the noise level of the received signal is indicated by a numerical value and a graph on the image receiving screen SC. This allows the user to know the noise level of the received signal.

  Further, in place of the text data decoder circuit 10, for example, by providing a video quality detection circuit 30 for detecting the amount of noise of the received signal described in the third embodiment, the video quality data S7 output from the video quality detection circuit 30 is data related to frequency. The image quality data S7 can be read out from the memory 6 as necessary and displayed on the image receiving screen.

  FIG. 13 shows an example of displaying video quality data on the receiving screen SC. In FIG. 13, the image quality of the received signal is indicated by numerical values and a graph on the image receiving screen SC. Thereby, the user can know the image quality (CLEAR LEVEL) of the image signal, and can know the optimal direction of the indoor / outdoor antenna while referring to the screen display of the image quality data, for example.

<Fifth embodiment>
FIG. 14 shows the configuration of a VTR automatic tuning apparatus A5 as a fifth embodiment according to the present invention. In FIG. 14, reference numeral 2 denotes a tuner circuit which is connected to an antenna 1 and which can be switched in accordance with an input signal system by a control signal from the outside; A video signal processing circuit including a SYNC separation circuit, 4 is an AFT detection circuit that receives a received signal from the tuner circuit 2 and detects the presence or absence of a broadcasting station, 5 is a tuning control circuit that controls the tuning operation of the tuner circuit 2, and 6 is tuning A memory connected to the control circuit, which receives a SYNC signal S2 output from the video signal processing circuit 3 and determines whether the video signal system is the NTSC system or another system based on the number of SYNC signals; Reference numeral 12 denotes a mode switching circuit first control signal S9 which is an output of the SYNC discrimination circuit 11. A tuning mode switching circuit for receiving a mode switching signal S11 to the tuner circuit 2 to switch the tuning mode. The tuning mode switching circuit includes a tuning control circuit 5, a memory 6, a SYNC determination circuit 11, and a tuning mode switching circuit 12. A system controller 7A is configured. Further, it receives a color burst signal (ident signal) S8, which is one of the outputs of the video signal processing circuit 3, and determines whether the video signal system is the PAL system or the SECAM system. As S10, a color discrimination circuit 13 to be provided to the tuning mode switching circuit 12 is provided.

  Here, the SYNC discriminating circuit 11 has a configuration for counting the number of SYNCs per second (the number of pulses) by a microcomputer or the like, and when 60 SYNCs are counted per second (60 Hz), the NTSC system is used. If 50 SYNCs are counted per second (50 Hz), it is determined that the system is the SECAM system or the PAL system.

  Next, the color determination circuit 13 will be described. FIG. 15 is a block diagram illustrating a configuration of the color determination circuit 13. In FIG. 15, a color discriminating circuit 13 includes a burst gate circuit 131 for passing a color burst signal S8 every 1H, and a frequency filter 132 connected to the burst gate circuit 131 for extracting only the color burst signal S8 having a frequency of 4.43 MHz. A DC conversion circuit 133 for DC-converting the signal passed through the frequency filter 132, a DC signal output from the DC conversion circuit 133, and a DC signal obtained by delaying the output of the DC conversion circuit 133 by 1H via the delay circuit 134 And a comparator 135 for comparing

  Next, the operation will be described. As shown in FIG. 15, a color burst signal (ident signal in the SECAM method) S8 generally follows the SYNC signal S2 in both the SECAM method and the PAL method, and its frequency is 4.43 MHz in the case of the PAL method. On the other hand, in the case of the SECAM system, signals of 4.25 MHz and 4.41 MHz appear alternately every 1H. Therefore, using the burst gate circuit 131 and the frequency filter 132, the frequency of the color burst signal S8 for each 1H is filtered out, converted to a DC value by the DC conversion circuit 133, and the DC level for each 1H is compared by the comparator 135. By doing so, if the DC level for each 1H is the same, the PAL system is determined to be the SECAM system if the DC level for each 1H is different.

  Next, the operation of the automatic tuning apparatus A5 will be described with reference to the flowcharts shown in FIGS. When the system controller 7A receives an auto tuning command from the user, the tuning mode of the tuner circuit 2 is set to the PAL system as an initial setting, and the memory address of the memory 6 is set to the station number “0” (step ST1). ).

  Next, a tuning control signal S3 is sent to the tuner circuit 2 to control the tuning frequency to be increased by a certain amount (step ST2).

  At this time, it is determined whether or not the current frequency has reached the upper limit of the tuning frequency, that is, whether or not tuning has been completed (step ST3). If the current frequency has reached the upper limit of the tuning frequency, tuning is terminated. Otherwise, in order to detect the presence or absence of a broadcasting station transmitting a signal of that frequency, the AFT signal S4 output from the AFT detection circuit 4 and the presence / absence of a signal separated by the video signal processing circuit 3 Is input to the tuning control circuit 5 (step ST4).

  At this time, if both the AFT signal S4 and the SYNC signal S2 are given, the tuning control circuit 5 determines that the signal from the broadcast station has been received, and executes the next step ST5. If neither signal S2 is given, the tuning frequency is increased by a fixed amount in step ST2.

  In step ST5, the SYNC signal S2 from the video signal processing circuit 3 is sent to the SYNC discriminating circuit 11 in the system controller 7A, and the SYNC discriminating circuit 11 controls the mode switching circuit first control when the SYNC signal S2 is given at 60 Hz. The signal S9 is output to the tuning mode switching circuit 12, and the mode switching signal S11 is used to change the tuner circuit 2 to the NTSC mode (step ST6). When the SYNC signal S2 is given at 50 Hz, it is determined that the signal is other than the NTSC method.

  When the tuner circuit 2 is set to the NTSC mode, the tuning data (data relating to the frequency) at that time is stored in the address of the station number “0” of the memory 6 and the information that the current video signal system is the NTSC system is also provided. In order to store the next tuning data, the address of the memory 6 is incremented by one to set the station number to "1" (step ST7).

  Next, in step ST8, the tuning mode of the tuner circuit 2 is set to the PAL system. In step ST2, the tuning frequency is increased by a certain amount and the next tuning operation is performed. The operations in steps ST2 to ST8 are repeated, and the upper limit of the tuning frequency is set. When it reaches, the tuning ends. The tuning data obtained by the tuning is supplied from the address in the memory 6 to the system for channel selection, a position number for channel selection is assigned, and the tuning mode ends.

  If it is determined in step ST5 that the system is not the NTSC system, the color determination circuit 13 which has received the color burst signal S8 from the video signal processing circuit 3 performs the color determination, and determines the SECAM system or another system. (Step ST9). Here, in the case of the SECAM-L system, since the video signal S1 is tuned in the PAL mode, hunting occurs, and the frequency change of the color burst signal S8 cannot be accurately determined. .

  If it is determined in step ST9 that the system is the SECAM system, the tuning mode (data related to frequency) at that time is stored in the address of the station number “0” in the memory 6 while the tuning mode is maintained in the PAL mode. The information that the current video signal system is the SECAM system is also stored, and in order to store the next tuning data, the address of the memory 6 is incremented by one to be the station number "1" (step ST7). In the case of the SECAM system, tuning can be performed in the PAL mode.

  Since the tuning mode of the tuner circuit 2 is the PAL mode, it is not necessary to reset the tuning frequency in step ST8. Next, in step ST2, the tuning frequency is increased by a certain amount and the next tuning operation is performed. , ST9 and ST7 are repeated, and the tuning is terminated when the upper limit of the tuning frequency is reached.

  On the other hand, if it is determined in step ST9 that the method is not the SECAM method, the color determination circuit 13 receiving the color burst signal S8 from the video signal processing circuit 3 performs the color determination again, and performs the SECAM method and the other methods. (Step ST10). In the determination in step ST10, when the color burst signal S8 is 4.43 MHz, it is determined that the color burst signal S8 is a PAL method.

  If it is determined in step ST10 that the PAL system is used, the tuner circuit 2 stores the tuning data (data related to the frequency) at that time in the address of the station number "0" in the memory 6 while maintaining the PAL mode. The information that the current video signal system is the PAL system is also stored, and in order to store the next tuning data, the address of the memory 6 is incremented by one to set the station number to "1" (step ST7).

  Since the tuning mode of the tuner circuit 2 is the PAL mode, it is not necessary to reset the tuning frequency in step ST8. Next, in step ST2, the tuning frequency is increased by a certain amount and the next tuning operation is performed. , ST9, ST10, and ST7 are repeated, and the tuning ends when the upper limit of the tuning frequency is reached.

  On the other hand, if it is determined in step ST10 that the system is other than the PAL system, the color determination circuit 13 outputs the mode switching circuit second control signal S10 to give to the tuning mode switching circuit 12, and switches the tuner circuit 2 by the mode switching signal S11. The mode is changed to the SECAM-L mode (step ST11).

  Next, in step ST12, the color discrimination circuit 13 which has received the color burst signal S8 from the video signal processing circuit 3 performs color discrimination, and discriminates again between the SECAM method and another method.

  If it is determined in step ST12 that the SECAM system is used, the tuning data (data related to frequency) at that time is stored in the address of the station number “0” in the memory 6 while the tuning mode is maintained in the SECAM-L mode, and the current The information that the video signal system is the SECAM system is also stored, and in order to store the next tuning data, the address of the memory 6 is incremented by one to be the station number "1" (step ST7).

  Next, in step ST8, the tuning mode of the tuner circuit 2 is set to the PAL system. In step ST2, the tuning frequency is increased by a certain amount and the next tuning operation is started. In steps ST2 to ST5, ST9, ST10, ST11, ST12, The operations in ST7 and ST8 are repeated, and when the upper limit of the tuning frequency is reached, the tuning ends. The tuning data obtained by the tuning is supplied from the address in the memory 6 to the system for channel selection, a position number for channel selection is assigned, and the tuning mode ends.

  On the other hand, if it is determined in step ST12 that the system is other than the SECAM system, the tuning mode is maintained in the SECAM-L mode (step ST13), and the tuning data (data related to frequency) at that time is stored in the memory 6 with the station number "0". At the same time, information indicating that the current video signal system is another system that cannot be determined is also stored. To store the next tuning data, the address of the memory 6 is incremented by one and the station number “ 1 "(step ST7).

  Next, in step ST8, the tuning mode of the tuner circuit 2 is set to the PAL system, and in step ST2, the tuning frequency is increased by a certain amount and the next tuning operation is performed, and steps ST2 to ST5, ST9, ST10, ST11ST12, ST7, The operation of ST8 is repeated, and the tuning ends when the upper limit of the tuning frequency is reached. The tuning data obtained by the tuning is supplied from the address in the memory 6 to the system for channel selection, a position number for channel selection is assigned, and the tuning mode ends.

  Here, the operation after step ST12 is a system for preventing the tuning operation from being stopped even when an indistinguishable signal such as a ghost signal is received. Can arbitrarily specify a video signal system. It is also effective when the signal electric field is weak and the color discrimination circuit 13 cannot discriminate the video signal system.

  As described above, according to the automatic tuning apparatus A5 shown in FIG. 14, by providing the SYNC discriminating circuit 11 and the color discriminating circuit 13, the received signal can be transmitted in the PAL system, SECAM system, SECAM-L system, and NTSC system. Since it is possible to determine which video signal system is used and automatically switch the tuning mode of the tuner circuit 2, the user does not need to perform the switching operation in accordance with the video signal system.

  Further, an automatic tuning apparatus that does not stop the tuning operation even when a signal that cannot be distinguished such as a ghost signal is received, or when the signal electric field is weak and the color discrimination circuit 13 cannot distinguish the video signal method can be obtained. .

  The video signal data stored in the memory 6 is read out from the memory 6 as needed at the time of auto-tuning and after the end of auto-tuning, for example, for switching a chroma circuit or a tuner circuit or rearranging channel positions. May be used.

  In the automatic tuning apparatus A5, the example of increasing the frequency from the lower frequency to the higher frequency has been described. However, the automatic tuning operation may be performed from the higher frequency to the lower frequency. Further, when there are various frequency bands (BAND) such as VHF and UHF, tuning may be performed from any frequency band, tuning may be performed only for a specific frequency band, or the tuning direction may be changed for each frequency band. .

<Sixth embodiment>
FIG. 18 shows the configuration of an automatic tuning apparatus A6 for a VTR as a sixth embodiment according to the present invention. In FIG. 18, the same components as those of the automatic tuning device A5 described with reference to FIG. 14 are denoted by the same reference numerals, and redundant description will be omitted.

  As can be seen from FIG. 18, the automatic tuning device A6 has a configuration in which the color discriminating circuit 13 is removed from the automatic tuning device A5. Therefore, the automatic tuning device A6 is a device having a function of determining whether the received signal is the video signal system of the PAL system or the NTSC system.

  Hereinafter, the operation of the automatic tuning apparatus A6 will be described with reference to the flowchart shown in FIG. When the system controller 7A receives an auto tuning command from the user, the tuning mode of the tuner circuit 2 is set to the PAL system as an initial setting, and the memory address of the memory 6 is set to the station number “0” (step ST1). ).

  Next, a tuning control signal S3 is sent to the tuner circuit 2 to control the tuning frequency to be increased by a certain amount (step ST2).

  At this time, it is determined whether or not the current frequency has reached the upper limit of the tuning frequency, that is, whether or not tuning has been completed (step ST3). If the current frequency has reached the upper limit of the tuning frequency, tuning is terminated. Otherwise, in order to detect the presence or absence of a broadcasting station transmitting a signal of that frequency, the AFT signal S4 output from the AFT detection circuit 4 and the presence / absence of a signal separated by the video signal processing circuit 3 Is input to the tuning control circuit 5 (step ST4).

  At this time, if both the AFT signal S4 and the SYNC signal S2 are given, the tuning control circuit 5 determines that the signal from the broadcast station has been received, and executes the next step ST5. If neither signal S2 is given, the tuning frequency is increased by a fixed amount in step ST2.

  In step ST5, the SYNC signal S2 from the video signal processing circuit 3 is sent to the SYNC discriminating circuit 11 in the system controller 7A, and the SYNC discriminating circuit 11 controls the mode switching circuit first control when the SYNC signal S2 is given at 60 Hz. The signal S9 is output to the tuning mode switching circuit 12, and the mode switching signal S11 is used to change the tuner circuit 2 to the NTSC mode (step ST6). When the SYNC signal S2 is given at 50 Hz, it is determined that the signal is other than the NTSC method.

  When the tuner circuit 2 is set to the NTSC mode, the tuning data (data relating to the frequency) at that time is stored in the address of the station number “0” of the memory 6 and the information that the current video signal system is the NTSC system is also provided. In order to store the next tuning data, the address of the memory 6 is incremented by one to set the station number to "1" (step ST7).

  Next, in step ST2, the tuning frequency is increased by a certain amount to start the next tuning operation, and the operations in steps ST2 to ST7 are repeated. When the tuning frequency reaches the upper limit, the tuning is ended. The tuning data obtained by the tuning is supplied from the address in the memory 6 to the system for channel selection, a position number for channel selection is assigned, and the tuning mode ends.

  If it is determined in step ST5 that the mode is other than the NTSC system, the mode switching circuit first control signal S9 is output to the tuning mode switching circuit 12, and the tuner circuit 2 is changed to the PAL mode by the mode switching signal S11. . (Step ST6). Since the tuning mode of the tuner circuit 2 is set to the PAL mode as an initial setting, if the tuning mode is not changed to the NTSC mode, the step ST6 is not necessary.

  When the tuner circuit 2 is set to the PAL mode, the tuning data (data related to the frequency) at that time is stored in the address of the station number “0” in the memory 6 and the information that the current video signal system is the PAL system is also provided. In order to store the next tuning data, the address of the memory 6 is incremented by one to set the station number to "1" (step ST7).

  Next, in step ST2, the tuning frequency is increased by a certain amount to start the next tuning operation, and the operations in steps ST2 to ST7 are repeated. When the tuning frequency reaches the upper limit, the tuning is ended. The tuning data obtained by the tuning is supplied from the address in the memory 6 to the system for channel selection, a position number for channel selection is assigned, and the tuning mode ends.

  As described above, according to the automatic tuning apparatus A6 shown in FIG. 18, the provision of the SYNC discriminating circuit 11 makes it possible to discriminate whether the received signal is the PAL system or the NTSC system video signal system. Since the tuning mode of the tuner circuit 2 can be selectively switched, there is no need for the user to perform the switching operation in accordance with the video signal system.

  Note that the other functions are the same as those of the automatic tuning apparatus A5, and thus redundant description will be omitted.

<Seventh embodiment>
FIG. 20 shows the configuration of an automatic tuning apparatus A7 for a VTR as a seventh embodiment according to the present invention. 20, a system controller 7B including a tuning control circuit 5, a memory circuit 6, and a tuning mode switching circuit 12 is provided instead of the system controller 7A of the automatic tuning apparatus A5 described with reference to FIG. In addition, the same components as those of the automatic tuning device A5 are denoted by the same reference numerals, and overlapping description will be omitted.

  As can be seen from FIG. 20, the automatic tuning device A7 has a configuration in which the SYNC discrimination circuit 11 is removed from the automatic tuning device A5. Therefore, the automatic tuning apparatus A7 is a device having a function of determining whether the received signal is the PAL system, the SECAM system, or the SECAM-L system.

  Hereinafter, the operation of the automatic tuning apparatus A7 will be described with reference to the flowchart shown in FIG. When the system controller 7A receives an auto tuning command from the user, the tuning mode of the tuner circuit 2 is set to the PAL system as an initial setting, and the memory address of the memory 6 is set to the station number “0” (step ST1). ).

  Next, a tuning control signal S3 is sent to the tuner circuit 2 to control the tuning frequency to be increased by a certain amount (step ST2).

  At this time, it is determined whether or not the current frequency has reached the upper limit of the tuning frequency, that is, whether or not tuning has been completed (step ST3). If the current frequency has reached the upper limit of the tuning frequency, tuning is terminated. Otherwise, in order to detect the presence or absence of a broadcasting station transmitting a signal of that frequency, the AFT signal S4 output from the AFT detection circuit 4 and the presence / absence of a signal separated by the video signal processing circuit 3 Is input to the tuning control circuit 5 (step ST4).

  At this time, if both the AFT signal S4 and the SYNC signal S2 are given, the tuning control circuit 5 determines that the signal from the broadcast station has been received, and executes the next step ST5. If neither signal S2 is given, the tuning frequency is increased by a fixed amount in step ST2.

  In step ST5, the color discrimination circuit 13 which has received the color burst signal S8 from the video signal processing circuit 3 performs color discrimination, and discriminates between the SECAM method and another method. Here, in the case of the ECAM-L system, since the video signal S1 is tuned in the PAL mode, hunting occurs, and the frequency change of the color burst signal S8 cannot be accurately determined. .

  When it is determined in step ST5 that the system is the SECAM system, the tuning data (data related to frequency) at that time is stored in the address of the station number “0” in the memory 6 while the tuning mode is maintained in the PAL mode. The information that the current video signal system is the SECAM system is also stored, and in order to store the next tuning data, the address of the memory 6 is incremented by one to be the station number "1" (step ST6). In the case of the SECAM system, tuning can be performed in the PAL mode.

  Here, since the tuning mode of the tuner circuit 2 is the PAL mode, it is not necessary to reset it in step ST7. Next, in step ST2, the tuning frequency is increased by a certain amount and the next tuning operation is performed. Is repeated, and when the upper limit of the tuning frequency is reached, the tuning is terminated.

  On the other hand, if it is determined in step ST5 that the system is not the SECAM system, the color determination circuit 13 receiving the color burst signal S8 from the video signal processing circuit 3 performs the color determination again, and switches between the PAL system and the other systems. (Step ST8). In the determination in step ST8, when the color burst signal S8 is 4.43 MHz, it is determined as the PAL method, otherwise, it is determined as a method other than the PAL method.

  If it is determined in step ST8 that the PAL system is used, the tuner circuit 2 stores the tuning data (data related to the frequency) at that time in the address of the station number “0” in the memory 6 while maintaining the PAL mode. The information that the current video signal system is the PAL system is also stored, and in order to store the next tuning data, the address of the memory 6 is incremented by one to be the station number "1" (step ST6).

  Here, since the tuning mode of the tuner circuit 2 is the PAL mode, it is not necessary to reset the tuning frequency in step ST7. Next, in step ST2, the tuning frequency is increased by a fixed amount and the next tuning operation is performed. , ST8, ST6, and ST7 are repeated, and the tuning ends when the upper limit of the tuning frequency is reached.

  On the other hand, if it is determined in step ST8 that the system is other than the PAL system, the color determination circuit 13 outputs the mode control circuit second control signal S10 to give it to the tuning mode switching circuit 12, and controls the tuner circuit 2 by the mode switching signal S11. The mode is changed to the SECAM-L mode (step ST9).

  Next, in step ST10, the color discrimination circuit 13 receiving the color burst signal S8 from the video signal processing circuit 3 performs color discrimination, and discriminates again between the SECAM method and another method.

  If it is determined in step ST10 that the system is the SECAM system, the tuning data (data related to frequency) at that time is stored in the address of the station number “0” in the memory 6 while the tuning mode is maintained in the SECAM-L mode, and the current The information that the video signal system is the SECAM system is also stored, and in order to store the next tuning data, the address of the memory 6 is incremented by one to be the station number "1" (step ST6).

  Next, in step ST7, the tuning mode of the tuner circuit 2 is set to the PAL system, and in step ST2, the tuning frequency is increased by a certain amount and the next tuning operation is performed. In steps ST2 to ST5, ST8, ST9, ST10, ST6, The operation of ST7 is repeated, and the tuning ends when the tuning frequency reaches the upper limit. The tuning data obtained by the tuning is supplied from the address in the memory 6 to the system for channel selection, a position number for channel selection is assigned, and the tuning mode ends.

  On the other hand, if it is determined in step ST10 that the system is other than the SECAM system, the tuning mode is maintained in the SECAM-L mode (step ST11), and the tuning data (data related to frequency) at that time is stored in the memory 6 with the station number “0”. At the same time, information indicating that the current video signal system is another system that cannot be determined is also stored. To store the next tuning data, the address of the memory 6 is incremented by one and the station number “ 1 "(step ST6).

  Next, in step ST7, the tuning mode of the tuner circuit 2 is set to the PAL system, and in step ST2, the tuning frequency is increased by a certain amount and the next tuning operation is performed. In steps ST2 to ST5, ST8, ST9, ST10, ST6, The operation of ST7 is repeated, and the tuning ends when the tuning frequency reaches the upper limit. The tuning data obtained by the tuning is supplied from the address in the memory 6 to the system for channel selection, a position number for channel selection is assigned, and the tuning mode ends.

  Here, the operation after step ST10 is a system for preventing the tuning operation from being stopped even when an indistinguishable signal such as a ghost signal is received. Can arbitrarily specify a video signal system. It is also effective when the signal electric field is weak and the color discrimination circuit 13 cannot discriminate the video signal system.

  As described above, according to the automatic tuning apparatus A7 shown in FIG. 20, the provision of the color discriminating circuit 13 makes it possible to determine whether the received signal is of the PAL system, the SECAM system, or the SECAM-L system. Can be automatically determined and the tuning mode of the tuner circuit 2 can be switched automatically, so that the user does not need to perform the switching operation in accordance with the video signal system.

  Further, an automatic tuning apparatus that does not stop the tuning operation even when a signal that cannot be distinguished such as a ghost signal is received, or when the signal electric field is weak and the color discrimination circuit 13 cannot distinguish the video signal method can be obtained. .

  Note that the other functions are the same as those of the automatic tuning apparatus A5, and thus redundant description will be omitted.

<Modification>
The configurations of the automatic tuning devices A1 to A4 according to the first to fourth embodiments according to the present invention are added to the automatic tuning devices A5 to A7 according to the fifth to seventh embodiments according to the present invention described above. Then, the broadcast station information, the noise data, and the video quality data may be stored in the memory and displayed on the image receiving screen.

  For this purpose, the text data decoder circuit 10, the noise detection circuit 20, and the video quality detection circuit 30 are provided such that the video signal S1 output from the tuner circuit 2 is received and the output is supplied to the tuning control circuit 5. The CG circuit 40 is provided between the output of the video signal processing circuit 3 and the video signal output terminal 9.

<Eighth embodiment>
FIG. 22 shows the configuration of an automatic tuning apparatus A8 for a VTR as an eighth embodiment according to the present invention. In FIG. 22, 2A is a tuner circuit connected to the antenna 1, 4 is an AFT detection circuit which receives a signal received from the tuner circuit 2A and detects the presence or absence of a broadcast station, and 5 is a tuning control which controls the tuning operation of the tuner circuit 2A. The circuit 6 is a memory connected to the tuning control circuit, and the tuning control circuit 5A and the memory 6 constitute a system control circuit 7C. The audio processing device 60 is connected to the tuner circuit 2A.

  The sound processing device 60 receives a sound intermediate frequency signal (SIF signal) S12 output from the tuner circuit 2A, demodulates the sound into a sound, and demodulates the sound into a sound, and a voltage controlled oscillator (hereinafter referred to as a voltage controlled oscillator). VCO).

  In the audio processing device 60, an FM audio demodulation circuit 61, 62, 63, 64 for performing FM detection and an AM audio demodulation circuit 65 for performing AM detection are provided so that SIF signals are supplied in parallel, respectively. A VCO 610 having an oscillation frequency of 4.5 MHz is provided at 61, a VCO 620 having an oscillation frequency of 5.5 MHz is provided at the FM voice demodulation circuit 62, a VCO 630 having an oscillation frequency of 6.0 MHz is provided at the FM voice demodulation circuit 63, and FM voice demodulation. A VCO 640 having an oscillation frequency of 6.5 MHz is connected to the circuit 64 and the AM audio demodulation circuit 65. The outputs of the FM audio demodulation circuits 61, 62, 63, 64 and the AM audio demodulation circuit 65 are output from the tuning control circuit 5A. Given to.

  Here, the FM sound demodulation circuits 61, 62, 63 and 64 are constituted by FM detection circuits of a quadrature system or the like, and the AM sound demodulation circuit 65 is constituted by an AM detection circuit, both of which are well-known circuits. Therefore, detailed description is omitted. The VCO also has a general configuration, and a detailed description thereof will be omitted.

  Next, the operation of the automatic tuning apparatus A8 will be described with reference to the flowcharts shown in FIGS. The tuning control circuit 5A that has received the automatic tuning command from the user sends a tuning control signal S3 to the tuner circuit 2A, and controls the tuning frequency to be increased by a fixed amount (step ST1).

  An AFT signal S4 output from the AFT detection circuit 4 is input to the tuning control circuit 5 in order to detect the presence or absence of a broadcast station audio signal (audio carrier) received by the antenna 1 (step ST2).

  If the AFT signal S4 is not given in step ST2, it is determined whether or not the current frequency has reached the upper limit of the tuning frequency, that is, whether or not the tuning has been completed (step ST3). If the frequency has reached the upper limit, the tuning is terminated. If not, the operation of step ST1 is performed again.

  When the AFT signal S4 is given in step ST2, the SIF signal S12 output from the tuner circuit 2A is given to the FM audio demodulation circuit 61 (step ST4). A VCO 610 having an oscillation frequency of 4.5 MHz is connected to the FM audio demodulation circuit 61. If the SIF signal S12 includes an audio carrier that is at the frequency 4.5 MHz of the VCO 610, the audio signal is demodulated. (Step ST5) The frequency of the VCO at that time is stored in the memory 6 together with the tuning data transmitted to the system controller 7C (Step ST6), and the operations after Step ST1 are performed.

  Here, if there is no audio carrier at the frequency 4.5 MHz of the VCO 610 in the given SIF signal S12, the FM audio demodulation circuit 62 does not have the frequency 5.5 MHz of the VCO 620 in the given SIF signal S12. It is determined whether or not there is a voice carrier (step ST7). If there is a voice carrier, the voice signal is demodulated (step ST5) and transmitted to the system controller 7C, and the tuning data and the VCO frequency at that time are stored in the memory 6. Then (step ST6), the operation after step ST1 is performed.

  Similarly, when there is no voice carrier at the frequency 5.5 MHz of the VCO 620 in the given SIF signal S12, the FM voice demodulation circuit 63 does not have the frequency 6.0 MHz of the VCO 630 in the given SIF signal S12. It is determined whether or not there is a voice carrier (step ST8). If there is a voice carrier, the voice signal is demodulated (step ST5), and transmitted to the system controller 7C and the tuning data and the VCO frequency at that time are stored in the memory 6. Then (step ST6), the operation after step ST1 is performed.

  Similarly, when there is no voice carrier at the frequency 6.0 MHz of the VCO 630 in the given SIF signal S12, the frequency of the VCO 640 is 6.5 MHz in the given SIF signal S12 in the FM voice demodulation circuit 64. It is determined whether or not there is a voice carrier (step ST9). If there is a voice carrier, the voice signal is demodulated (step ST5), transmitted to the system controller 7C and stored in the memory 6 together with the tuning data and the frequency of the VCO at that time. (Step ST6) The operation after step ST1 is performed.

  Similarly, if there is no voice carrier at the frequency 6.5 MHz of the VCO 640 in the given SIF signal S12, the AM voice demodulation circuit 65 matches the frequency of the VCO 640 in the given SIF signal S12 with 6.5 MHz. It is determined whether or not there is a voice carrier (step ST10). If there is a voice carrier, the voice signal is demodulated (step ST5), transmitted to the system controller 7C, and the tuning data and the VCO frequency at that time are stored in the memory 6. (Step ST6) The operation after step ST1 is performed.

  If there is no voice carrier at the frequency of each VCO in steps ST4 to ST8, it is determined whether or not the tuning frequency has reached the upper limit (step ST11), and the tuning frequency has reached the upper limit. In this case, the tuning operation is terminated, and if the upper limit is not reached, the operation of step ST1 is repeated.

  As described above, the audio signal system of the received signal can be detected depending on which of the FM audio demodulation circuits 61 to 64 and the AM audio demodulation circuit 65 the SIF signal S12 has. For example, in the PAL system and the SECAM system, when the output of 6.0 MHz appears, the audio signal system is I system, and when the output of 5.5 MHz appears, the audio signal system is B / G. If the output of 6.5 MHz appears, the audio signal system is the D / K system. When an output of 4.5 MHz appears, the audio signal system is the M system, and the video signal system at this time is the NTSC system.

  Therefore, according to the automatic tuning apparatus A8 of the present embodiment, the received signal can be further finely classified by determining not only the video signal system but also the audio signal system. Such a function is to automatically cope with each broadcasting station when there are a plurality of broadcasting stations of the same video signal system and the audio signal systems are different, for example, in reception around a border. Can be.

  Further, by providing a plurality of audio demodulation circuits and VCOs having different oscillation frequencies in each of the audio demodulation circuits, the determination of the audio signal system is performed in parallel, thereby reducing the time required for the determination. it can.

  Although the automatic tuning device A8 described above does not refer to the determination of the video signal system, the video signal method is combined with the automatic tuning devices A5 to A7 shown in the fifth to seventh embodiments according to the present invention. The method can be determined.

  In addition, the result of the determination of the audio signal system may be read out from the memory 6 at the time of auto tuning or after completion of the auto tuning, and may be used for, for example, switching of a chroma circuit or a video tuner circuit or rearrangement of channel positions. Further, this determination operation may be performed not only during the auto tuning but also at any time if necessary.

<Ninth embodiment>
FIG. 25 shows the configuration of a VTR automatic tuning apparatus A9 as a ninth embodiment according to the present invention. In FIG. 25, 2A is a tuner circuit connected to the antenna 1, 4 is an AFT detection circuit which receives a signal received from the tuner circuit 2A and detects the presence or absence of a broadcasting station, and 5 is a tuning control which controls the tuning operation of the tuner circuit 2. The circuit 6 is a memory circuit connected to the tuning control circuit, and the tuning controller 5 and the memory 6 constitute a system controller 7. Further, the tuner circuit 2A is connected to an audio demodulation circuit 70 that receives the SIF signal S12 and demodulates the audio into an audio. The audio demodulation circuit 70 is controlled by a VCO control signal S13 output from the tuning control circuit 5, and has a predetermined frequency. The VCO 80 that outputs the clock signal S14 of FIG. The audio signal S15 output from the audio demodulation circuit 70 is supplied to the audio detection circuit 90, and the detected audio detection signal S16 is supplied to the tuning control circuit 5.

  Here, the audio demodulation circuit 70 is constituted by an FM detection circuit of a quadrature system or the like, and is a well-known circuit, so that detailed description will be omitted. The VCO 80 outputs a clock signal S14 from 5.5 MHz to 7.0 MHz, but its configuration is general and detailed description is omitted.

  FIG. 26 shows the configuration of the audio detection circuit 90. As shown in FIG. 26, the audio detection circuit 90 includes a half-wave rectification circuit 901 and a pulse shaping circuit 902, and the (demodulated) audio signal S15 is half-wave rectified by the half-wave rectification circuit 901 and is provided to the pulse shaping circuit 902. Can be The pulse shaping circuit 902 converts the half-wave rectified audio signal into a pulse, and outputs it as a “High” and “Low” DC voltage signal (audio detection signal S16).

  Next, the operation of the automatic tuning apparatus A9 will be described with reference to the flowchart shown in FIG. The tuning control circuit 5, which has received the automatic tuning command from the user, first sets the oscillation frequency of the VCO 80 to 5.5 MHz as an initial setting (step ST1).

  Next, a tuning control signal S3 is sent to the tuner circuit 2A to control the tuning frequency to increase by a certain amount (step ST2).

  Next, an AFT signal S4, which is an output of the AFT detection circuit 4, is input to the tuning control circuit 5 in order to detect the presence or absence of a broadcasting station transmitting the signal of that frequency (step ST3).

  When the AFT signal S4 is provided, if the tuning frequency is held and there is a voice carrier which is at the frequency 5.5 MHz of the VCO 80 in the provided SIF signal S12, it is demodulated into the voice signal S15 and output. Is performed (step ST4).

  The demodulated audio signal S15 is sent to the audio detection circuit 90, pulsed, and sent to the system controller 7 as the audio detection signal S16 (step ST5).

  If the sound detection signal S16 is "High", the tuning data at that time and the oscillation frequency of the VCO 80 are stored as address data in the memory 6 in the system controller 7, and the next stored address is incremented by one to further perform the tuning operation. Is continued (step ST6).

  The operations of steps ST1 to ST6 are performed until the upper limit of the tuning frequency is reached, and when the upper limit is reached, the tuning mode is ended (step ST7).

  If the audio detection signal S16 is "Low" in step ST5, the oscillation frequency of the VCO 80 is increased by 0.5 MHz (step ST8). If the oscillation frequency of the VCO 80 at that time is not 7.0 MHz, the audio demodulation circuit 70 The demodulated audio signal S15 is sent to the audio detection circuit 90 (step ST9), and the audio signal S15 is pulsed. If the voice detection signal S16 changes to "High" by changing the oscillation frequency of the VCO 80, the tuning data at that time and the oscillation frequency of the VCO 80 are stored as address data in the memory 6 in the system controller 7, and then stored. The address is incremented by one and the tuning operation is further continued (step ST6).

  Note that, even if the oscillation frequency of the VCO 80 is changed, if the sound detection signal S16 remains "Low", the process returns to step ST1 when the frequency of the VCO reaches 7.0 MHz, and the tuning ends.

  As described above, the automatic tuning apparatus A9 includes the VCO 80 that outputs the clock signal S14 from 5.5 MHz to 7.0 MHz and the audio detection circuit 90, so that the audio signal can be output without providing a plurality of audio demodulation circuits 70. Since the difference between the methods can be determined, the number of components can be reduced, which is suitable for miniaturization.

  Further, by combining with the automatic tuning devices A5 to A7 shown in the fifth to seventh embodiments according to the present invention, it is possible to determine the video signal system together.

  In the above-described embodiment, an example is described in which the AFT signal S4 output from the AFT detection circuit 4 is used to detect the presence / absence of a broadcasting station. However, tuning is performed by using the SIF signal S12 output from the tuner circuit 2A. It is possible to improve the determination accuracy at the time.

  In addition, the result of the discrimination of the audio carrier method may be read out from the memory 6 at the time of auto tuning or after completion of the auto tuning, and may be used, for example, for switching between a chroma circuit and a video tuner circuit and for rearranging channel positions. Further, this determination operation may be performed not only during the auto tuning but also at any time if necessary.

<Tenth embodiment>
FIG. 28 shows the configuration of an automatic tuning apparatus A10 for a VTR as a tenth embodiment according to the present invention. In FIG. 28, reference numeral 2A denotes a tuner circuit connected to the antenna 1, 3 denotes a video signal processing circuit including a SYNC separation circuit that receives a composite video signal S1 from the tuner circuit 2A and performs signal processing, and 4 denotes a tuner circuit from the tuner circuit 2A. AFT detection circuit for receiving the received signal and detecting the presence / absence of a broadcasting station, 5 is a tuning control circuit for controlling the tuning operation of the tuner circuit 2A, 6 is a memory connected to the tuning control circuit, and 100 is stored in the memory 6. A sorting control circuit for arranging the performed tuning data according to a predetermined position number, and is controlled by a SYNC signal S2 from the video signal processing circuit 3.

  A system controller 7D includes a tuning control circuit 5, a memory 6, and a sorting control circuit. Reference numeral 10 denotes a text data decoder circuit which receives the video signal S 1, extracts a teletext signal S 5, which is information from a broadcasting station, from the video signal S 1, and supplies the text signal to the memory 6. Reference numeral 8 denotes an input signal mode switch for switching the operation of the tuning control circuit 5 in accordance with the video signal mode of the input signal.

  Here, the configuration of the sorting control circuit 100 will be described with reference to FIG. Sorting control circuit 100 is a circuit configured by software, but is shown as hardware in FIG.

  In FIG. 29, sorting control circuit 100 includes position number pointer 110 for assigning a position number for channel selection, station number pointer 120 for assigning a broadcast station number (station number), and A first register 130 for reading out broadcast station information (station ID) from a sort reference memory 61 provided in advance, a second register 140 for reading out a station ID from a tuning data memory 62 stored in the memory 6 by a tuning operation, A comparing unit 150 for comparing the station IDs read into the register 130 and the second register 140, and a determining unit 160 for judging the comparison result and instructing the position number pointer 110 and the station number pointer 120 with the assigned number. Comprising a, the results of the sort in which the position number and station number corresponding by sorting, is stored in the sorting result memory 63 in the memory 6.

  Next, the operation of the automatic tuning apparatus A10 will be described with reference to the flowcharts shown in FIGS. When an auto tuning command is received from the user by the system controller 7D, the address of the memory of the memory 6 is set to the station number "0" (step ST1).

  Next, a tuning control signal S3 is sent to the tuner circuit 2A to control the tuning frequency to be increased by a fixed amount (step ST2). At this time, in order to detect the presence or absence of a broadcasting station transmitting the signal of that frequency, an AFT signal S4 output from the AFT detection circuit 4 and a SYNC indicating the presence or absence of the signal separated by the video signal processing circuit 3 are provided. The signal S2 is input to the tuning control circuit 5 to make a determination (step ST3).

  At this point, if both the AFT signal S4 and the SYNC signal S2 are given, the tuning control circuit 5 determines that the signal from the broadcasting station has been received, and stores the tuning data at that time in the station number "0" in the memory 6. (Step ST4).

  At the same time, the text data decoder circuit 10 decodes the text information superimposed during the signal blanking period from the composite video signal S 1, and sends the decoded teletext (teletext) signal S 5 to the tuning control circuit 5. It is input (step ST5).

  In the tuning control circuit 5, the broadcast station information (station ID) in the teletext signal S5 is extracted and determined (step ST6), and stored at the address of the station number "0" in the memory 6 in the same manner as the data on the frequency. (Step ST7).

  Subsequently, in order to store the next tuning data, the address of the memory 6 is incremented by one, and the next tuning operation is started as the station number "1" (step ST8).

  On the other hand, in step ST3, when neither the AFT signal S4 nor the SYNC signal S2 is given, it is determined whether or not the current frequency has reached the upper limit of the tuning frequency, that is, whether or not tuning has been completed (step ST9). ).

  If the frequency at this time has not reached the upper limit of the tuning frequency, the operation of step ST2 is performed again, and the operations of steps ST2 to ST8 are repeated until the upper limit of the tuning frequency is reached.

  If the upper limit of the tuning frequency has been reached in step ST9, the sorting operation of the sorting control circuit 100 is performed. First, the sort reference memory 61 in the memory 6 is activated, a station ID corresponding to a preset position number is read (step ST10), and a station ID indicated by the position number pointer 110 is loaded into the first register 130 (step ST10). ST11).

  Next, the tuning data memory 62 in the memory 6 is activated, the station ID corresponding to the station number is read, the station ID indicated by the station number pointer 120 is loaded into the second register 140, and the first Then, the respective station IDs loaded into the second registers 130 and 140 are compared, and the determination unit 160 makes a determination (step ST12).

  If the station IDs match in step ST12, the station numbers are stored in the sort result memory 63 in the memory 6 in association with the position numbers (step ST13).

  Next, the position number is incremented by one in the position number pointer 110 (step ST14).

  Next, whether or not the current station number has reached the upper limit is determined by the station number pointer 120 (step ST15).

  On the other hand, even when the station IDs do not match in step ST12, the operation of step ST15 is performed.

  If the current station number has not reached the upper limit in step ST15, the station number is incremented by one in the station number pointer 120, and the operation after step ST12 is performed again (step ST16).

  On the other hand, if the current station number has reached the upper limit, the position number pointer 110 determines whether or not all the station IDs have been sorted, that is, whether or not the position numbers have reached the upper limit (step ST17). .

  If it is determined in step ST17 that all the station IDs have been sorted, the sorting operation ends.

  On the other hand, if all the station IDs are not sorted, the position number is incremented by one in the position number pointer 110, and the operation after step ST11 is performed again (step ST18).

  The automatic tuning circuit A10 described above includes a sorting control circuit 100, and by performing a sorting operation, a broadcasting station of a predetermined station ID is automatically set for each position number, and the user corresponds to the position number. Thus, it is not necessary to set a broadcasting station, and the burden on the user can be reduced.

  If a station ID corresponding to a station number is not found in the above sorting operation, a process such as skip is performed without selecting the position number.

<Eleventh embodiment>
FIG. 32 shows the configuration of a VTR automatic tuning apparatus A11 as an eleventh embodiment according to the present invention. In FIG. 32, the same components as those of the automatic tuning apparatus A10 described with reference to FIG. 28 are denoted by the same reference numerals, and redundant description will be omitted.

  In FIG. 32, a memory 6 is connected to a user input control circuit 200 for allowing a user to set a rearrangement order, and includes a tuning control circuit 5, a memory 6, a sorting control circuit 100, and a user input control circuit 200. A controller 7E is configured. The user input control circuit 200 is connected to a key input device 300 for a user to input settings.

  Here, the configuration of the user input control circuit 200 will be described with reference to FIG. 33, a user input control circuit 200 includes a key interface circuit 210 for transmitting and receiving signals to and from the key input device 300; a position number register 220 and a station name register 230 connected to the key interface circuit 210; A position ID register 220 connected to the sorting reference memory 61 of the memory 6 via the position number pointer 110 of the sorting control circuit 100; The ID conversion circuit 240 is also connected to the sort reference memory 61.

  Next, the operation of the user input control circuit 200 will be described. When the user inputs broadcast station information (broadcast station name, broadcast station name code, etc.) corresponding to the position number from the key input device 300, the position number is given to the position number register 220 and the broadcast station information is given to the station name register 230. The position number is provided to the sort reference memory 61 by the position number pointer 110, and the broadcast station information is converted to a station ID by the station ID conversion circuit 240, provided to the sort reference memory 61, and stored. Here, the broadcast station information is displayed on the display device 250.

  Next, the operation of the automatic tuning apparatus A11 will be described with reference to the flowcharts shown in FIGS. First, the user inputs broadcast station information (broadcast station name, broadcast station name code, etc.) in correspondence with the position number using the key input device 300, and sets a sort order (step ST1).

  Next, when the system controller 7E receives the auto tuning command, the address of the memory of the memory 6 is set to the station number “0” (step ST2).

  Next, a tuning control signal S3 is sent to the tuner circuit 2A to control the tuning frequency to be increased by a fixed amount (step ST3). At this time, in order to detect the presence or absence of a broadcasting station transmitting the signal of that frequency, an AFT signal S4 output from the AFT detection circuit 4 and a SYNC indicating the presence or absence of the signal separated by the video signal processing circuit 3 are provided. The signal S2 is input to the tuning control circuit 5 to make a determination (step ST4).

  At this point, if both the AFT signal S4 and the SYNC signal S2 are given, the tuning control circuit 5 determines that the signal from the broadcasting station has been received, and stores the tuning data at that time in the station number "0" in the memory 6. (Step ST5).

  At the same time, the text data decoder circuit 10 decodes the text information superimposed during the signal blanking period from the composite video signal S 1, and sends the decoded teletext (teletext) signal S 5 to the tuning control circuit 5. It is input (step ST6).

  In the tuning control circuit 5, the broadcast station information (station ID) in the teletext signal S5 is extracted and determined (step ST7), and stored in the memory 6 at the address of the station number "0" in the same manner as the data on the frequency. (Step ST8).

  Subsequently, in order to store the next tuning data, the address of the memory 6 is incremented by one, and the next tuning operation is performed as the station number "1" (step ST9).

  On the other hand, in step ST4, when neither the AFT signal S4 nor the SYNC signal S2 is given, it is determined whether the current frequency has reached the upper limit of the tuning frequency, that is, whether or not tuning has been completed (step ST10). ).

  If the frequency at this time has not reached the upper limit of the tuning frequency, the operation of step ST3 is performed again, and the operations of steps ST3 to ST9 are repeated until the upper limit of the tuning frequency is reached.

  If the upper limit of the tuning frequency has been reached in step ST10, the sorting operation of the sorting control circuit 100 is performed. First, the sort reference memory 61 in the memory 6 is activated, a station ID corresponding to a preset position number is read (step ST11), and a station ID indicated by the position number pointer 110 is loaded into the first register 130 (step ST11). ST12).

  Next, the tuning data memory 62 in the memory 6 is activated, the station ID corresponding to the station number is read, the station ID indicated by the station number pointer 120 is loaded into the second register 140, and the first Then, the respective station IDs loaded into the second registers 130 and 140 are compared, and the determination unit 160 makes a determination (step ST13).

  If the station IDs match in step ST13, the station numbers are stored in the sort result memory 63 in the memory 6 in association with the position numbers (step ST14).

  Next, the position number is incremented by one in the position number pointer 110 (step ST15).

  Next, whether or not the current station number has reached the upper limit is determined by the station number pointer 120 (step ST16).

  On the other hand, even when the station IDs do not match in step ST13, the operation of step ST16 is performed.

  If the current station number has not reached the upper limit in step ST16, the station number is incremented by one in the station number pointer 120, and the operation after step ST12 is performed again (step ST17).

  On the other hand, if the current station number has reached the upper limit, the position number pointer 110 determines whether or not all the station IDs have been sorted, that is, whether or not the position numbers have reached the upper limit (step ST18). .

  If it is determined in step ST18 that all the station IDs have been sorted, the sorting operation ends.

  On the other hand, if all the station IDs are not sorted, the position number is incremented by one in the position number pointer 110, and the operation after step ST12 is performed again (step ST19).

  The automatic tuning circuit A11 described above includes the user input control circuit 200 to perform the sorting operation on the broadcasting station desired by the user in accordance with the sorting order set by the user, and to assign the station ID desired by the user to each position number. Broadcast stations are automatically set. This imposes a burden on the user in that the user has to set the position number and broadcast station information, but in areas where the receivable broadcast stations are limited, There is an advantage that a broadcasting station to be automatically tuned can be set according to the user's need.

<Twelfth embodiment>
FIG. 36 shows the configuration of an automatic tuning apparatus A12 for a VTR as a twelfth embodiment according to the present invention. In FIG. 36, the same components as those of the automatic tuning apparatus A10 described with reference to FIG. 28 are denoted by the same reference numerals, and redundant description will be omitted.

  In FIG. 36, the memory 6 receives the SYNC signal S2 and the color burst signal (ident signal) S8 output from the video signal processing circuit 3, and the video signal system is NTSC, PAL, SECAM, SECAM-L. Is connected to a video signal type determination circuit 400 that determines which one of the two is used.

  The system controller 7D includes the tuning control circuit 5, the memory 6, and the sorting control circuit 100.

  Here, the video signal system determination circuit 400 determines whether the video signal system is the NTSC system or another system based on the number of SYNC signals, as shown in the automatic tuning apparatus A5 described in the fifth embodiment of the present invention. A configuration including a determination circuit 11 and a color determination circuit 13 that receives a color burst signal (ident signal) S8, which is one of the outputs of the video signal processing circuit 3, and determines whether the video signal system is the PAL system or the SECAM system. Since the details of the SYNC discriminating circuit 11 and the color discriminating circuit 13 have already been described, a duplicate description is omitted, and in the following description, the output of the video signal discriminating circuit 400 is referred to as “video signal discriminating Results. Also, since the sorting control circuit 100 uses the video signal system instead of the broadcast station information (station ID), the "station ID" in the automatic tuning apparatus A10 described in the tenth embodiment according to the present invention. Is read as “video signal system”.

  Next, the operation of the automatic tuning apparatus A12 will be described with reference to the flowcharts shown in FIGS. When an auto tuning command is received from the user by the system controller 7D, the address of the memory of the memory 6 is set to the station number "0" (step ST1).

  Next, a tuning control signal S3 is sent to the tuner circuit 2A to control the tuning frequency to be increased by a fixed amount (step ST2). At this time, in order to detect the presence or absence of a broadcasting station transmitting the signal of that frequency, an AFT signal S4 output from the AFT detection circuit 4 and a SYNC indicating the presence or absence of the signal separated by the video signal processing circuit 3 are provided. The signal S2 is input to the tuning control circuit 5 to make a determination (step ST3).

  At this point, if both the AFT signal S4 and the SYNC signal S2 are given, the tuning control circuit 5 determines that the signal from the broadcasting station has been received, and stores the tuning data at that time in the station number "0" in the memory 6. (Step ST4).

  At the same time, a determination result of the video signal system is obtained from the video signal system determination circuit 400 (step ST5).

  The determination result of the video signal system is stored in the address of the station number “0” in the memory 6 in the same manner as the data on the frequency (step ST6).

  Then, in order to store the next tuning data, the address of the memory 6 is incremented by one, and the next tuning operation is performed as the station number "1" (step ST7).

  On the other hand, in step ST3, when neither the AFT signal S4 nor the SYNC signal S2 is given, it is determined whether the current frequency has reached the upper limit of the tuning frequency, that is, whether or not tuning has been completed (step ST8). ). If the frequency at this time has not reached the upper limit of the tuning frequency, the operation of step ST2 is performed again, and the operations of steps ST2 to ST7 are repeated until the upper limit of the tuning frequency is reached.

  If the upper limit of the tuning frequency has been reached in step ST8, the sorting operation of the sorting control circuit 100 is performed. First, the sort reference memory 61 in the memory 6 is activated to read the video signal system corresponding to the preset position number (step ST9), and load the video signal system indicated by the position number pointer 110 into the first register 130. (Step ST10).

  Next, the tuning data memory 62 in the memory 6 is activated, the video signal system corresponding to the station number is read, and the video signal system indicated by the station number pointer 120 is loaded into the second register 140. The video signal systems loaded into the first and second registers 130 and 140 are compared, and the determination unit 160 makes a determination (step ST11).

  If the video signal systems match in step ST11, the station number is stored in the sort result memory 63 in the memory 6 in association with the position number (step ST12).

  Next, the position number is incremented by one in the position number pointer 110 (step ST13).

  Next, it is determined by the station number pointer 120 whether or not the current station number has reached the upper limit (step ST14).

  On the other hand, even when the video signal systems do not match in step ST11, the operation of step ST14 is performed.

  If the current station number has not reached the upper limit in step ST14, the station number is incremented by one in the station number pointer 120, and the operation after step ST11 is performed again (step ST15).

  On the other hand, if the current station number has reached the upper limit, the position number pointer 110 determines whether or not all the video signal systems have been sorted, that is, whether or not the position numbers have reached the upper limit (step ST16). ).

  If it is determined in step ST16 that all the video signal systems have been sorted, the sorting operation ends.

  On the other hand, if all the video signal systems are not sorted, the position number is incremented by one in the position number pointer 110, and the operation after step ST11 is performed again (step ST17).

  The automatic tuning circuit A12 described above includes the sorting control circuit 100 and the video signal type discriminating circuit 400, and performs a sorting operation, so that a broadcast station of a predetermined video signal type is automatically set to each position number. This eliminates the need for the user to input a video signal system corresponding to the position number, thereby reducing the burden on the user.

<Thirteenth embodiment>
FIG. 39 shows the configuration of a VTR automatic tuning apparatus A13 as a thirteenth embodiment according to the present invention. In FIG. 39, the same components as those of the automatic tuning apparatus A12 described with reference to FIG. 36 are denoted by the same reference numerals, and redundant description will be omitted.

  In FIG. 39, a user input control circuit 200 for a user to make settings is connected to the memory 6, and a system controller 7E including the tuning control circuit 5, the memory 6, the sorting control circuit 100, and the user input control circuit 200 is configured. Have been. The user input control circuit 200 is connected to a key input device 300 for a user to input settings. Here, since the configurations of the user input control circuit 200 and the key input device 300 have been described in the eleventh embodiment, duplicate description will be omitted. Since the sorting control circuit 100 and the user input control circuit 200 use the video signal method instead of the broadcast station information (station ID), the automatic tuning apparatus described in the eleventh embodiment according to the present invention is used. The “station ID” in A11 is read as “video signal system”.

  Next, the operation of the automatic tuning apparatus A13 will be described with reference to the flowcharts shown in FIGS. First, the user uses the key input device 300 to input a video signal system corresponding to a position number, and sets a sort order (step ST1).

  Next, when the system controller 7E receives the auto tuning command, the address of the memory of the memory 6 is set to the station number “0” (step ST2).

  Next, a tuning control signal S3 is sent to the tuner circuit 2A to control the tuning frequency to be increased by a fixed amount (step ST3). At this time, in order to detect the presence or absence of a broadcasting station transmitting the signal of that frequency, an AFT signal S4 output from the AFT detection circuit 4 and a SYNC indicating the presence or absence of the signal separated by the video signal processing circuit 3 are provided. The signal S2 is input to the tuning control circuit 5 to make a determination (step ST4).

  At this point, if both the AFT signal S4 and the SYNC signal S2 are given, the tuning control circuit 5 determines that the signal from the broadcasting station has been received, and stores the tuning data at that time in the station number "0" in the memory 6. (Step ST5).

  At the same time, a determination result of the video signal system is obtained from the video signal system determination circuit 400 (step ST6).

  The determination result of the video signal system is stored in the address of the station number “0” in the memory 6 in the same manner as the data on the frequency (step ST7).

  Subsequently, in order to store the next tuning data, the address of the memory 6 is incremented by one, and the next tuning operation is started as the station number "1" (step ST8).

  On the other hand, in step ST4, when neither the AFT signal S4 nor the SYNC signal S2 is given, it is determined whether or not the current frequency has reached the upper limit of the tuning frequency, that is, whether or not tuning has been completed (step ST8). ). If the frequency at this time has not reached the upper limit of the tuning frequency, the operation of step ST2 is performed again, and the operations of steps ST3 to ST8 are repeated until the upper limit of the tuning frequency is reached.

  If the upper limit of the tuning frequency has been reached in step ST9, the sorting operation of the sorting control circuit 100 is performed. First, the sort reference memory 61 in the memory 6 is activated to read the video signal system corresponding to the preset position number (step ST10), and load the video signal system indicated by the position number pointer 110 into the first register 130. (Step ST11).

  Next, the tuning data memory 62 in the memory 6 is activated, the video signal system corresponding to the station number is read, and the video signal system indicated by the station number pointer 120 is loaded into the second register 140. The respective video signal systems loaded into the first and second registers 130 and 140 are compared, and the determination unit 160 makes a determination (step ST12).

  If the video signal systems match in step ST12, the station number is stored in the sort result memory 63 in the memory 6 in association with the position number (step ST13).

  Next, the position number is incremented by one in the position number pointer 110 (step ST14).

  Next, whether or not the current station number has reached the upper limit is determined by the station number pointer 120 (step ST15).

  On the other hand, even when the video signal systems do not match in step ST12, the operation of step ST15 is performed.

  If the current station number has not reached the upper limit in step ST15, the station number is incremented by one in the station number pointer 120, and the operation after step ST12 is performed again (step ST16).

  On the other hand, if the current station number has reached the upper limit, the position number pointer 110 determines whether or not all the video signal systems have been sorted, that is, whether or not the position numbers have reached the upper limit (step ST17). ).

  If it is determined in step ST17 that all the video signal systems have been sorted, the sorting operation ends.

  On the other hand, if all the video signal systems are not sorted, the position number is incremented by one in the position number pointer 110, and the operation after step ST11 is performed again (step ST18).

  The automatic tuning circuit A13 described above includes a user input control circuit 200 in addition to the sorting control circuit 100 and the video signal system discriminating circuit 400, so that the broadcasting station desired by the user can be sorted according to the sort order set by the user. By doing so, the video signal system desired by the user is automatically set for each position number. This imposes a burden on the user in that the user has to set the position number and the video signal system, but in an area where various video signal systems are mixed, There is an advantage that a broadcasting station can be set for the video signal system.

<Fourteenth embodiment>
FIG. 42 shows the configuration of an automatic tuning apparatus A14 for a VTR as a fourteenth embodiment according to the present invention. In FIG. 42, the same components as those of the automatic tuning device A10 shown in FIG. In the automatic tuning apparatus A14, an audio signal type discrimination circuit 500 connected to the tuner circuit 2A is provided instead of the text data decoder circuit 10 of the automatic tuning apparatus A10 shown in FIG.

  Here, the audio signal type determination circuit 500 includes the audio processing device 60 of the automatic tuning device A8 described with reference to FIG. 22 or the audio demodulation circuit 70, the VCO 80, and the voice detection device of the automatic tuning device A9 described with reference to FIG. The audio signal processing means comprises a circuit 90. Since these details have already been described, a duplicate description will be omitted, and in the following description, the output of the audio signal type determination circuit 500 will be referred to as a "audio type determination result". Also, since the sorting control circuit 100 uses an audio system instead of the broadcast station information (station ID), the "station ID" in the automatic tuning apparatus A10 described in the tenth embodiment according to the present invention is used. Replaced with "sound system."

  Next, the operation of the automatic tuning apparatus A14 will be described with reference to the flowcharts shown in FIGS. 43 and 44. When an auto tuning command is received from the user by the system controller 7D, the address of the memory of the memory 6 is set to the station number "0" (step ST1).

  Next, a tuning control signal S3 is sent to the tuner circuit 2A to control the tuning frequency to be increased by a fixed amount (step ST2). At this time, in order to detect the presence or absence of a broadcasting station transmitting the signal of that frequency, an AFT signal S4 output from the AFT detection circuit 4 and a SYNC indicating the presence or absence of the signal separated by the video signal processing circuit 3 are provided. The signal S2 is input to the tuning control circuit 5 to make a determination (step ST3).

  At this point, if both the AFT signal S4 and the SYNC signal S2 are given, the tuning control circuit 5 determines that the signal from the broadcasting station has been received, and stores the tuning data at that time in the station number "0" in the memory 6. (Step ST4).

  At the same time, the result of the audio system determination is obtained from the audio signal system determination circuit 500 (step ST5).

  The determination result of the audio system is stored at the address of the station number "0" in the memory 6 in the same manner as the data on the frequency (step ST6).

  Then, in order to store the next tuning data, the address of the memory 6 is incremented by one, and the next tuning operation is performed as the station number "1" (step ST7).

  On the other hand, in step ST3, when neither the AFT signal S4 nor the SYNC signal S2 is given, it is determined whether the current frequency has reached the upper limit of the tuning frequency, that is, whether or not tuning has been completed (step ST8). ). If the frequency at this time has not reached the upper limit of the tuning frequency, the operation of step ST2 is performed again, and the operations of steps ST2 to ST7 are repeated until the upper limit of the tuning frequency is reached.

  If the upper limit of the tuning frequency has been reached in step ST8, the sorting operation of the sorting control circuit 100 is performed. First, the sort reference memory 61 in the memory 6 is activated to read the audio system corresponding to the preset position number (step ST9), and load the audio system indicated by the position number pointer 110 into the first register 130 (step ST9). ST10).

  Next, the tuning data memory 62 in the memory 6 is activated to read the audio system corresponding to the station number, load the audio system indicated by the station number pointer 120 into the second register 140, and in the comparing unit 150, Then, the respective voice systems loaded in the second registers 130 and 140 are compared, and the determination unit 160 makes a determination (step ST11).

  If the voice systems match in step ST11, the station number is stored in the sort result memory 63 in the memory 6 in association with the position number (step ST12).

  Next, the position number is incremented by one in the position number pointer 110 (step ST13).

  Next, it is determined by the station number pointer 120 whether or not the current station number has reached the upper limit (step ST14).

  On the other hand, even when the voice systems do not match in step ST11, the operation of step ST14 is performed.

  If the current station number has not reached the upper limit in step ST14, the station number is incremented by one in the station number pointer 120, and the operation after step ST11 is performed again (step ST15).

  On the other hand, if the current station number has reached the upper limit, the position number pointer 110 determines whether or not all the audio systems have been sorted, that is, whether or not the position numbers have reached the upper limit (step ST16). .

  If it is determined in step ST16 that all the audio systems have been sorted, the sorting operation ends.

  On the other hand, if all the audio systems are not sorted, the position number is incremented by one in the position number pointer 110, and the operation after step ST10 is performed again (step ST17).

  The automatic tuning circuit A14 described above includes the sorting control circuit 100 and the audio signal type discriminating circuit 500. By performing the sorting operation, a broadcasting station of a predetermined audio type is automatically set to each position number. You. This has the advantage that, when broadcast stations of different audio systems from other countries are mixed around a border or the like, a broadcast station required by the user (for example, a broadcast station in the home country) can be automatically received.

<Fifteenth embodiment>
FIG. 45 shows the configuration of an automatic tuning apparatus A15 for a VTR as a fifteenth embodiment according to the present invention. In FIG. 45, the same components as those of the automatic tuning device A14 described with reference to FIG. 42 are denoted by the same reference numerals, and redundant description will be omitted.

  In FIG. 45, a user input control circuit 200 for a user to make settings is connected to the memory 6, and a system controller 7E including the tuning control circuit 5, the memory 6, the sorting control circuit 100, and the user input control circuit 200 is configured. Have been. The user input control circuit 200 is connected to a key input device 300 for a user to input settings. Here, since the configurations of the user input control circuit 200 and the key input device 300 have been described in the eleventh embodiment, duplicate description will be omitted. Also, in the sorting control circuit 100 and the user input control circuit 200, an audio system is used instead of the broadcast station information (station ID). Therefore, the automatic tuning apparatus A11 described in the eleventh embodiment according to the present invention. Is replaced with "voice method".

  Next, the operation of the automatic tuning apparatus A15 will be described with reference to the flowcharts shown in FIGS. 46 and 47. First, the user uses the key input device 300 to input a voice method corresponding to a position number, and sets a sort order (step ST1).

  Next, when the system controller 7E receives the auto tuning command, the address of the memory of the memory 6 is set to the station number “0” (step ST2).

  Next, a tuning control signal S3 is sent to the tuner circuit 2A to control the tuning frequency to be increased by a fixed amount (step ST3). At this time, in order to detect the presence or absence of a broadcasting station transmitting the signal of that frequency, an AFT signal S4 output from the AFT detection circuit 4 and a SYNC indicating the presence or absence of the signal separated by the video signal processing circuit 3 are provided. The signal S2 is input to the tuning control circuit 5 to make a determination (step ST4).

  At this point, if both the AFT signal S4 and the SYNC signal S2 are given, the tuning control circuit 5 determines that the signal from the broadcasting station has been received, and stores the tuning data at that time in the station number "0" in the memory 6. (Step ST5).

  At the same time, the result of the audio system determination is obtained from the audio signal system determination circuit 500 (step ST6).

  The determination result of the audio system is stored in the address of the station number "0" in the memory 6 in the same manner as the data on the frequency (step ST7).

  Subsequently, in order to store the next tuning data, the address of the memory 6 is incremented by one, and the next tuning operation is started as the station number "1" (step ST8).

  On the other hand, in step ST4, when neither the AFT signal S4 nor the SYNC signal S2 is given, it is determined whether or not the current frequency has reached the upper limit of the tuning frequency, that is, whether or not tuning has been completed (step ST9). ). If the frequency at this time has not reached the upper limit of the tuning frequency, the operation of step ST3 is performed again, and the operations of steps ST3 to ST8 are repeated until the upper limit of the tuning frequency is reached.

  If the upper limit of the tuning frequency has been reached in step ST9, the sorting operation of the sorting control circuit 100 is performed. First, the sort reference memory 61 in the memory 6 is activated to read the audio system corresponding to the preset position number (step ST10), and load the audio system indicated by the position number pointer 110 into the first register 130 (step ST10). ST11).

  Next, the tuning data memory 62 in the memory 6 is activated to read the audio system corresponding to the station number, load the audio system indicated by the station number pointer 120 into the second register 140, and in the comparing unit 150, Then, the respective voice systems loaded in the second registers 130 and 140 are compared, and the determination unit 160 makes a determination (step ST12).

  If the voice systems match in step ST12, the station number is stored in the sort result memory 63 in the memory 6 in association with the position number (step ST13).

  Next, the position number is incremented by one in the position number pointer 110 (step ST14).

  Next, whether or not the current station number has reached the upper limit is determined by the station number pointer 120 (step ST15).

  On the other hand, even when the voice systems do not match in step ST12, the operation of step ST15 is performed.

  If the current station number has not reached the upper limit in step ST15, the station number is incremented by one in the station number pointer 120, and the operation after step ST11 is performed again (step ST16).

  On the other hand, if the current station number has reached the upper limit, the position number pointer 110 determines whether or not all the audio systems have been sorted, that is, whether or not the position numbers have reached the upper limit (step ST17). .

  If it is determined in step ST17 that all the audio systems have been sorted, the sorting operation ends.

  On the other hand, if all the audio systems are not sorted, the position number is incremented by one in the position number pointer 110, and the operation after step ST11 is performed again (step ST18).

  The automatic tuning circuit A15 described above includes a user input control circuit 200 in addition to the sorting control circuit 100 and the audio signal system discrimination circuit 500, so that the broadcasting station desired by the user can be sorted according to the sort order set by the user. By doing so, the voice system desired by the user is automatically set for each position number. This imposes a burden on the user in that the user must set the position number and audio format, but is necessary when the user uses different audio format broadcast stations from other countries near borders. There is an advantage that only a suitable broadcasting station (for example, a broadcasting station in its own country) can be set.

<Sixteenth embodiment>
FIG. 48 shows the configuration of an automatic tuning apparatus A16 for a VTR as a sixteenth embodiment according to the present invention. In FIG. 48, the same components as those of the automatic tuning apparatus A10 shown in FIG. In the automatic tuning device A16, a video quality determining circuit 600 is provided instead of the text data decoder circuit 10 of the automatic tuning device A10 shown in FIG.

  Here, the video quality determination circuit 600 has the same configuration as the video quality detection circuit 30 of the automatic tuning apparatus A3 described with reference to FIG. 7 as the third embodiment, and has no blanking of the video signal S1 without a real signal. It outputs video quality data S7 proportional to the noise amount of the portion. Since the details of the video quality detection circuit 30 have already been described, a duplicate description will be omitted, and in the following description, the output of the video quality determination circuit 600 will be referred to as a “video quality determination result”. In the sorting control circuit 100, the image quality information is used instead of the broadcast station information (station ID). Therefore, the "station ID" in the automatic tuning apparatus A10 described in the tenth embodiment according to the present invention is used. Is read as "video quality."

  Next, the operation of the automatic tuning apparatus A16 will be described with reference to the flowcharts shown in FIGS. 49 and 50. When an auto tuning command is received from the user by the system controller 7D, the address of the memory of the memory 6 is set to the station number "0" (step ST1).

  Next, a tuning control signal S3 is sent to the tuner circuit 2A to control the tuning frequency to be increased by a fixed amount (step ST2). At this time, in order to detect the presence or absence of a broadcasting station transmitting the signal of that frequency, an AFT signal S4 output from the AFT detection circuit 4 and a SYNC indicating the presence or absence of the signal separated by the video signal processing circuit 3 are provided. The signal S2 is input to the tuning control circuit 5 to make a determination (step ST3).

  At this point, if both the AFT signal S4 and the SYNC signal S2 are given, the tuning control circuit 5 determines that the signal from the broadcasting station has been received, and stores the tuning data at that time in the station number "0" in the memory 6. (Step ST4).

  At the same time, a determination result of the video quality is obtained from the video quality determination circuit 600 (step ST5).

  The determination result of the image quality is stored at the address of the station number “0” in the memory 6 in the same manner as the data on the frequency (step ST6).

  Then, in order to store the next tuning data, the address of the memory 6 is incremented by one, and the next tuning operation is performed as the station number "1" (step ST7).

  On the other hand, in step ST3, when neither the AFT signal S4 nor the SYNC signal S2 is given, it is determined whether the current frequency has reached the upper limit of the tuning frequency, that is, whether or not tuning has been completed (step ST8). ). If the frequency at this time has not reached the upper limit of the tuning frequency, the operation of step ST2 is performed again, and the operations of steps ST2 to ST7 are repeated until the upper limit of the tuning frequency is reached.

  If the upper limit of the tuning frequency has been reached in step ST8, the sorting operation of the sorting control circuit 100 is performed. First, a reference level for comparing the received screen quality of each broadcasting station is set. Here, the maximum detectable level of the image quality is set (step ST9).

  Next, the tuning data memory 62 in the memory 6 is activated, the image quality corresponding to the station number is read, compared with the reference level, and the determination unit 160 makes a determination (step ST10).

  If the image qualities match in step ST10, the station number is stored in the sort result memory 63 in the memory 6 in association with the position number (step ST11).

  Next, the position number is incremented by one in the position number pointer 110 (step ST12).

  Next, it is determined by the station number pointer 120 whether or not the current station number has reached the upper limit (step ST13).

  On the other hand, even when the image quality does not match in step ST10, the operation of step ST13 is performed.

  If the current station number has not reached the upper limit in step ST13, the station number is incremented by one in the station number pointer 120, and the operation after step ST10 is performed again (step ST14).

  On the other hand, if the current station number has reached the upper limit, it is determined whether or not the reference level is the minimum level at which the image quality can be detected (step ST15).

  If it is determined in step ST15 that the reference level has reached the minimum level at which the image quality can be detected, the sorting operation ends.

  On the other hand, if the reference level has not reached the minimum level at which the image quality can be detected, the reference level is decremented, and the operation after step ST10 is performed again (step ST16).

  The automatic tuning circuit A16 described above includes the sorting control circuit 100 and the video quality determination circuit 600. By performing a sorting operation, each position number is automatically set in order from a broadcasting station having a high video quality. Will be. Therefore, when the same broadcast station is received at a different frequency, for example, a broadcast station with good image quality is preferentially stored.If a user selects a broadcast station in ascending position number, good broadcast can be obtained. It has the advantage of being able to receive.

  When a plurality of broadcasting stations having the same image quality are received, the position numbers are set in the order of the level comparison, that is, in the order of low or high broadcast frequency.

  In step ST9, the reference level set first may be set to the minimum level.

  In the automatic tuning circuit A16 described above, the sorting order is determined according to the image quality, but the sorting may be performed based on the amount of noise detected by a simple noise detector.

FIG. 2 is a diagram showing a configuration of a first embodiment of the automatic tuning apparatus according to the present invention. It is a figure showing the partial composition of the 1st example of an automatic tuning device concerning the present invention. 5 is a flowchart illustrating the operation of the first embodiment of the automatic tuning apparatus according to the present invention. It is a figure showing composition of a 2nd example of an automatic tuning device concerning the present invention. It is a figure showing the partial composition of the 2nd example of an automatic tuning device concerning the present invention. 6 is a flowchart illustrating an operation of the second embodiment of the automatic tuning apparatus according to the present invention. It is a figure showing the composition of the 3rd example of an automatic tuning device concerning the present invention. It is a figure showing the partial composition of the 3rd example of an automatic tuning device concerning the present invention. It is a flowchart explaining operation | movement of the 3rd Example of the automatic tuning apparatus which concerns on this invention. It is a figure showing the composition of the 4th example of an automatic tuning device concerning the present invention. It is a figure showing an example of operation of a 4th example of an automatic tuning device concerning the present invention. It is a figure showing an example of operation of a modification of a 4th example of an automatic tuning device concerning the present invention. It is a figure showing an example of operation of a modification of a 4th example of an automatic tuning device concerning the present invention. It is a figure showing the composition of the 5th example of an automatic tuning device concerning the present invention. It is a figure showing the partial composition of the 5th example of an automatic tuning device concerning the present invention. It is a flow chart explaining operation of a 5th example of an automatic tuning device concerning the present invention. It is a flow chart explaining operation of a 5th example of an automatic tuning device concerning the present invention. It is a figure showing the composition of the 6th example of an automatic tuning device concerning the present invention. It is a flow chart explaining operation of a 6th example of an automatic tuning device concerning the present invention. It is a figure showing the composition of the 7th example of an automatic tuning device concerning the present invention. It is a flowchart explaining operation | movement of the 7th Example of the automatic tuning apparatus which concerns on this invention. It is a figure showing the composition of the 8th example of an automatic tuning device concerning the present invention. It is a flow chart explaining operation of an 8th example of an automatic tuning device concerning the present invention. It is a flow chart explaining operation of an 8th example of an automatic tuning device concerning the present invention. It is a figure showing composition of a 9th example of an automatic tuning device concerning the present invention. It is a figure showing the partial composition of the 9th example of an automatic tuning device concerning the present invention. It is a flow chart explaining operation of a 9th example of an automatic tuning device concerning the present invention. It is a figure showing the composition of the 10th example of an automatic tuning device concerning the present invention. It is a figure showing the partial composition of the 10th example of an automatic tuning device concerning the present invention. It is a flow chart explaining operation of a 10th example of an automatic tuning device concerning the present invention. It is a flow chart explaining operation of a 10th example of an automatic tuning device concerning the present invention. It is a figure showing the composition of the 11th example of an automatic tuning device concerning the present invention. It is a figure showing the partial composition of the 11th example of an automatic tuning device concerning the present invention. It is a flow chart explaining operation of an 11th example of an automatic tuning device concerning the present invention. It is a flow chart explaining operation of an 11th example of an automatic tuning device concerning the present invention. It is a figure showing the composition of the 12th example of an automatic tuning device concerning the present invention. It is a flow chart explaining operation of a 12th example of an automatic tuning device concerning the present invention. It is a flow chart explaining operation of a 12th example of an automatic tuning device concerning the present invention. It is a figure showing the partial composition of the 13th example of an automatic tuning device concerning the present invention. It is a flow chart explaining operation of a 13th example of an automatic tuning device concerning the present invention. It is a flow chart explaining operation of a 13th example of an automatic tuning device concerning the present invention. It is a figure showing the composition of the 14th example of an automatic tuning device concerning the present invention. It is a flow chart explaining operation of a 14th example of an automatic tuning device concerning the present invention. It is a flow chart explaining operation of a 14th example of an automatic tuning device concerning the present invention. It is a figure showing the composition of the 15th example of an automatic tuning device concerning the present invention. It is a flow chart explaining operation of a 15th example of an automatic tuning device concerning the present invention. It is a flow chart explaining operation of a 15th example of an automatic tuning device concerning the present invention. It is a figure showing the composition of the 16th example of an automatic tuning device concerning the present invention. It is a flow chart explaining operation of a 16th example of an automatic tuning device concerning the present invention. It is a flow chart explaining operation of a 16th example of an automatic tuning device concerning the present invention. FIG. 3 is a diagram showing a configuration of a conventional automatic tuning device. 9 is a flowchart illustrating an operation of a conventional automatic tuning device. It is a figure explaining operation of the conventional automatic tuning device.

Explanation of reference numerals

40 character generator circuit, SC image receiving screen, 60 sound processing device, 610-640 voltage controlled oscillator, 61 sort reference memory, 62 tuning data memory, 63 sort result memory, key input device.

Claims (4)

Tuning means for tuning and selecting a predetermined channel from broadcast waves including at least a video signal; video signal processing means for receiving the video signal output from the tuning means and separating a synchronization signal included in the video signal; AFT detection means for detecting the presence or absence of a broadcast station based on a reception signal from the tuning means, and receiving the synchronization signal from the video signal processing means and the AFT signal from the AFT detection means, controlling the tuning operation of the tuning means. An automatic tuning apparatus comprising: a tuning control unit; and a storage unit connected to the tuning control unit and storing at least data on a tuning frequency of the tuning unit.
Receiving the video signal output from the tuning means, comprises a noise detection means for detecting random noise included in the video signal and outputting it as noise data,
An automatic tuning apparatus, wherein the noise data is stored in the storage means together with data on the tuning frequency via the tuning control means. Tuning means for tuning and selecting a predetermined channel from broadcast waves including at least a video signal; video signal processing means for receiving the video signal output from the tuning means and separating a synchronization signal included in the video signal; AFT detection means for detecting the presence or absence of a broadcast station based on a reception signal from the tuning means, and receiving the synchronization signal from the video signal processing means and the AFT signal from the AFT detection means, controlling the tuning operation of the tuning means. An automatic tuning apparatus comprising: a tuning control unit; and a storage unit connected to the tuning control unit and storing at least data on a tuning frequency of the tuning unit.
Receiving the video signal output from the tuning means, detecting the signal quality of the video signal, comprising a signal quality detection means for outputting signal quality data,
An automatic tuning apparatus, wherein the signal quality data is stored in the storage means together with data on the tuning frequency via the tuning control means. Tuning means for tuning and selecting a predetermined channel from broadcast waves including at least a video signal; video signal processing means for receiving the video signal output from the tuning means and separating a synchronization signal included in the video signal; AFT detection means for detecting the presence or absence of a broadcast station based on a reception signal from the tuning means, and receiving the synchronization signal from the video signal processing means and the AFT signal from the AFT detection means, controlling the tuning operation of the tuning means. An automatic tuning apparatus comprising: a tuning control unit; and a storage unit connected to the tuning control unit and storing at least data on a tuning frequency of the tuning unit.
Upon receiving the video signal output from the tuning means, determining the video quality of the video signal, and providing the determination result as the video quality information to the tuning control means, video quality determination means,
Sorting control means, which automatically rearranges stored contents including data on at least the tuning frequency of the tuning means stored in the storage means in order according to a predetermined rule,
Via the tuning control means, while storing the video quality information in the storage means together with data on the tuning frequency,
An automatic tuning apparatus, wherein the image quality information and the corresponding data related to the tuning frequency are automatically rearranged in the order of good image quality. The video quality determination unit has a video quality detection unit that receives the video signal output from the tuning unit and detects a signal quality of the video signal,
4. The automatic tuning apparatus according to claim 3, wherein the video quality information is a video quality signal output from the video quality detection unit as a result of the determination.

Images