JPH02302116A - Voltage tuning type channel selection circuit - Google Patents

Voltage tuning type channel selection circuit

Info

Publication number
JPH02302116A
JPH02302116A JP12314189A JP12314189A JPH02302116A JP H02302116 A JPH02302116 A JP H02302116A JP 12314189 A JP12314189 A JP 12314189A JP 12314189 A JP12314189 A JP 12314189A JP H02302116 A JPH02302116 A JP H02302116A
Authority
JP
Japan
Prior art keywords
data
rom
eeprom
tuning
voltage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP12314189A
Other languages
Japanese (ja)
Inventor
Toshiyuki Furuya
敏幸 古家
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP12314189A priority Critical patent/JPH02302116A/en
Publication of JPH02302116A publication Critical patent/JPH02302116A/en
Pending legal-status Critical Current

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  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)

Abstract

PURPOSE:To allow the circuit to cope with multi-station broadcast such as CATV by storing a tuning voltage data in an EEPROM and a data ROM separately so as to use the number of sufficient storable channels. CONSTITUTION:A CPU 2 designates an address to an EEPROM 5 and a data ROM 22 corresponding to input channel numbers (CH1, CH2,...CHn) and reads a channel data of the designated address, respectively. Both data are inputted to an adder circuit 23, where they are added and the data is restored to a required bit number of the original tuning voltage data, and inputted to a D/A converter 6 via an arithmetic RAM 4. When the tuning voltage data has 14-bit, the high-order 7-bit is stored in the data ROM 22, the low-order 7-bit is stored in the EEPROM 5 while separately, assigning, then the capacity of the EEPROM 5 is halved to that of a conventional circuit.

Description

【発明の詳細な説明】 [産業上の利用分野] この発明はTVやVTRなどの電圧同調による選局回路
のうち、特に周波数同調型(フリクエンシ゛−・シンセ
サイザ)に比し高速分局器や比較器などの使用が不要な
ことからIC化して安価に構成しやすい電圧同調型選局
回路に関するものである。
[Detailed Description of the Invention] [Industrial Application Field] This invention is applicable to voltage-tuned tuning circuits for TVs, VTRs, etc., especially high-speed dividers and comparators compared to frequency-tuned type (frequency synthesizers). This invention relates to a voltage-tuned tuning circuit that can be easily constructed at a low cost by using an IC because it does not require the use of any of the following.

[従来の技術] 第2図は従来の電圧同調型選局回路の構成を示すブロッ
ク図である。同図において、(1)は選局ICであり、
この選局I C(1)の内部は、CP U (2)と実
行プログラムを記憶するプログラムROM (3)と演
算用RA M (4)とチャンネルデータを記憶するE
EPROM(5)とD/Aコンバータ(6)との構成要
素からなる。
[Prior Art] FIG. 2 is a block diagram showing the configuration of a conventional voltage-tuned tuning circuit. In the figure, (1) is a channel selection IC,
The inside of this channel selection IC (1) includes a CPU (2), a program ROM (3) for storing execution programs, a RAM for calculations (4), and an E for storing channel data.
It consists of an EPROM (5) and a D/A converter (6).

(7)はチャンネル入カキ−1(8)はリモコン受信部
で、上記選局IC(1)の入力回路を構成する。(9)
はローパスフィルタ(以下、LPFと称す) 、 (1
0)はチューナで、上記選局I C(1)の出力回路を
構成する。
(7) is a channel input key 1 (8) is a remote control receiver, which constitutes an input circuit of the channel selection IC (1). (9)
is a low-pass filter (hereinafter referred to as LPF), (1
0) is a tuner, which constitutes the output circuit of the above-mentioned channel selection IC (1).

つぎに、上記構成の動作について説明する。Next, the operation of the above configuration will be explained.

チャンネル入カキ−(7)を押すかもしくは図示してい
ないリモコン装置の送信部を操作してリモコン受信部(
8)を動作させることにより、選局IC(1)が内部の
プログラムに従って選局動作を実行する。
Press the channel input key (7) or operate the transmitting section of the remote control device (not shown) to turn on the remote control receiving section (
8), the channel selection IC (1) executes the channel selection operation according to the internal program.

すなわち、入力チャンネル番号(C旧、C)12 、・
・・C)In)に対応してCP U (2)がE E 
F ROM (5)にアトレスヲ指定して、その指定ア
ドレスのチャンネルデータを読出す、ついで、その読出
されたチオンネルデータが演算用RA M (4)によ
り所定どおり演算されたのち、D/Aコンバータ(8)
に入力される。このD/Aコンバータ(8)において。
That is, input channel number (C old, C) 12, ・
...C) Corresponding to In), CPU (2)
An address is specified in the F ROM (5), and the channel data of the specified address is read out.Then, the read channel data is calculated as specified in the calculation RAM (4), and then the data is sent to the D/A converter. (8)
is input. In this D/A converter (8).

入力チャンネルデータが直流電圧に変換されて出力され
る。
Input channel data is converted to DC voltage and output.

つづいて、上記D/Aコンバータ(6)から出力される
同調電圧はL P F (9)により不要なリップル成
分が除去されたのち、チューナ(io)に加えられて受
信チャンネルを入力チャンネル番号になるように変更し
、所定の選局動作を終了する。
Next, the tuning voltage output from the D/A converter (6) has unnecessary ripple components removed by L P F (9), and is then applied to the tuner (io) to change the receiving channel to the input channel number. Then, the predetermined channel selection operation is completed.

[発明が解決しようとする課題] 従来の電圧同調型選局回路は、以上のように構成されて
いたので、同調電圧の最小変化ステップをAFTの引き
込み範囲以下にする必要があることから、EEPROM
に、受信チャンネルの一つ一つに各々13ないしL4b
itを割りあてなければならなかった。そのため、記憶
可能なチャンネル数を増やすと、例えば62チャンネル
分では、62X14=868ビツトとなり、大容量のE
EPROMが必要となる。その結果、チップ面積が大き
く、ICが高価になるという問題があった。
[Problems to be Solved by the Invention] Since the conventional voltage-tuned tuning circuit was configured as described above, it is necessary to keep the minimum change step of the tuning voltage below the pull-in range of the AFT.
13 to L4b for each receiving channel.
I had to allocate it. Therefore, if you increase the number of channels that can be stored, for example 62 channels, it will become 62 x 14 = 868 bits, which is a large capacity E.
EPROM is required. As a result, there was a problem that the chip area was large and the IC became expensive.

また、EEPROMの容量を小さくすると、記憶でさる
チャンネル数が制限され、CATVなどの多局放送に対
応できなくなるという問題があった。
Further, if the capacity of the EEPROM is reduced, the number of channels that can be stored is limited, and there is a problem that it becomes impossible to support multi-station broadcasting such as CATV.

この発明は上記のような問題点を解消するためになされ
たもので、小容量のEEPROMを用いて、チップ面積
の小さい安価なICとしながら、記憶チャンネル数を十
分に多くとることができる電圧同調型選局回路を提供す
ることを目的とする。
This invention was made in order to solve the above-mentioned problems.It uses a small-capacity EEPROM to create a low-cost IC with a small chip area, and provides voltage tuning that allows a sufficiently large number of storage channels. The purpose is to provide a pattern selection circuit.

[課題を解決するための手段] この発明に係る電圧同調型選局回路は、同調電圧データ
のうちの一部をEEPROMに、残りを別のROMに分
割して記憶し、読出し時にその両データを加算して元の
同調電圧データとして出力するように構成したことを特
徴とする。
[Means for Solving the Problems] A voltage tuning type tuning circuit according to the present invention stores part of the tuning voltage data in an EEPROM and the rest in another ROM, and stores both data at the time of reading. The present invention is characterized in that it is configured so that the sum is added and output as the original tuning voltage data.

[作用] この発明によれば、同調電圧データをEEPROMとR
OMとに分割して記憶させることにより、記憶チャンネ
ル数は十分に多くとりながら、EEPROMの必要容量
を小さくすることができる。また、新しく付加されるR
OMはEEPROMに比して十分に小さいチップ面積の
ものでよいから、選局回路全体としてのチップ面積は小
さく、小型で安価なICに構成することができる。
[Function] According to the present invention, tuning voltage data is transferred between EEPROM and R.
By storing the data separately in OM and OM, the required capacity of the EEPROM can be reduced while providing a sufficiently large number of storage channels. Also, the newly added R
Since the OM may have a sufficiently smaller chip area than the EEPROM, the overall chip area of the channel selection circuit is small and can be constructed as a small and inexpensive IC.

[発明の実施例] 以下、この発明の一実施例を図面にもとづいて説明する
[Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be described based on the drawings.

第1図はこの発明の一実施例による電圧同調型選局回路
の構成を示すブロック図である。同図において、第2図
で示す従来例と相違する点は1選局IC(1)の内部構
成要素として、チャンネルデータの一部を記憶するデー
タROM (22)5よびデータの加算回路(23)を
付加した点であり、その他の構成は第2図で示す従来例
と同一であるため、同一の符号を付して、それらの説明
を省略する。
FIG. 1 is a block diagram showing the configuration of a voltage-tuned tuning circuit according to an embodiment of the present invention. In the same figure, the points that differ from the conventional example shown in FIG. ), and the other configurations are the same as the conventional example shown in FIG. 2, so the same reference numerals are given and the explanation thereof will be omitted.

つぎに、上記構成の動作について説明する。Next, the operation of the above configuration will be explained.

チャンネル入カキ−(7)を押すかもしくは図示してい
ないリモコン装置の送信部を操作してリモコン受信部(
8)を動作させることにより、選局IC(1)が内部の
プログラムに従って選局動作を実行する。
Press the channel input key (7) or operate the transmitting section of the remote control device (not shown) to turn on the remote control receiving section (
8), the channel selection IC (1) executes the channel selection operation according to the internal program.

すなわち、入力チャンネル番号(CHI、C)!2 、
・・・CHn)に対応してCP tJ (2)がEEP
ROM(5)およびデータROM (22)にアドレス
を指定し、その指定アドレスのチャンネルデータをそれ
ぞれ読出す、ついで、それら両データが加算回路(23
)に入力されて加算され、元の同調電圧データの所要b
it数に戻されたのち、演算用RAM、(4)を経てD
/Aコンバータ(6)に入力される。このD/Aコンバ
ータ(8)において、チャンネルデータが直流電圧に変
換されて出力される。
That is, the input channel number (CHI, C)! 2,
...CHn), CP tJ (2) is EEP
Addresses are specified in the ROM (5) and data ROM (22), and the channel data at the specified addresses are read respectively.Then, both data are sent to the adder circuit (23).
) and added to the required b of the original tuning voltage data.
After being returned to the IT number, it is transferred to D via the calculation RAM (4)
/A converter (6). In this D/A converter (8), channel data is converted into a DC voltage and output.

つづいて、選局IC(1)から出力される同調電圧は従
来例の場合と同様な処理を経てチューナ(10)に加え
られ、所定の選局動作を終了する。
Subsequently, the tuning voltage output from the tuning IC (1) is applied to the tuner (10) through the same processing as in the conventional example, and the predetermined tuning operation is completed.

ここで、同調電圧データが14bitで、その上位7 
 bitをデータROM (22)に、下位7 bit
をEEPROM(5)に割り当てて記憶させると、EE
PROM(5)の容量は従来の場合の1/2の容量です
む。
Here, the tuning voltage data is 14 bits, and the upper 7
bit to data ROM (22), lower 7 bits
When assigned and stored in EEPROM (5), EE
The capacity of the PROM (5) is only 1/2 that of the conventional case.

ただし、このとき、データROM (22)を新しく必
要とするけれども、このデータROM (22)はEE
PROM(5)にくらべて十分に小さいチップ面積でよ
い、また通常、プログラムROM (3)はそのROM
容量を100%使用していないので、その未使用ROM
部分をデータROMとして転用することもできる。この
場合は、データROM用に新しいチップ面積を必要とし
ない。
However, at this time, a new data ROM (22) is required, but this data ROM (22) is an EE
It requires a sufficiently smaller chip area than the PROM (5), and the program ROM (3) is usually
Since 100% capacity is not used, the unused ROM
A portion can also be used as a data ROM. In this case, no new chip area is required for the data ROM.

また、チューナ(10)の特性があらかじめわかってい
て、放送チャンネル数と同調電圧との対応が知られてい
ると、その電圧データにもとづいてデータROM (2
2)の値を設定して選局IC(1)を製造することがで
きる。
Furthermore, if the characteristics of the tuner (10) are known in advance and the correspondence between the number of broadcast channels and the tuning voltage is known, data ROM (2) can be stored based on the voltage data.
The channel selection IC (1) can be manufactured by setting the value of 2).

さらに、E E F ROM(5)は、チューナ(10
)個々のばらつきによるデータ変動範囲を可変範囲とし
てカバーすればよい、チューナ(10)のばらつきはせ
いぜい数%以内であるので、EEPROM(5)はチャ
ンネルごとに各7 bitあれば十分である。
Furthermore, the E E F ROM (5) has a tuner (10
) It is sufficient to cover the data variation range due to individual variations as a variable range.Since the variations in the tuner (10) are within a few percent at most, it is sufficient for the EEPROM (5) to have 7 bits for each channel.

[発明の効果] 以上のように、この発明によれば、同調電圧データをE
EPROMとデータROMとに分割して記憶するように
構成したので、記憶可能なチャンネル数を十分に多くと
って、CATVなどの多局放送に対応することができる
ものでありながら、EEPROMの必要容量を小さくす
ることができるとともに、データROMのチップ面積は
EEPROMに比して十分に小さくてよいから、選局I
C全体を小形、安価に構成できる。
[Effects of the Invention] As described above, according to the present invention, tuning voltage data is
Since it is structured so that storage is divided into an EPROM and a data ROM, the number of channels that can be stored is sufficiently large to support multi-station broadcasting such as CATV, and the required capacity of the EEPROM is small. In addition, the chip area of the data ROM can be sufficiently smaller than that of the EEPROM, so the channel selection I
The entire C can be made small and inexpensive.

【図面の簡単な説明】[Brief explanation of drawings]

第1図はこの発明の一実施例による電圧同調型選局回路
の構成を示すブロック図、第2図は従来の電圧同調型選
局回路の構成を示すブロック図である。 (1)・・・選局IC(2)・・・cpu、(5)・・
・EEPROM、(8)・・・D/Aコンバータ、(2
2)・・・データROM、(23)・・・加算回路。 なお、図中の同一符号は同一または相当部分を示す。
FIG. 1 is a block diagram showing the configuration of a voltage tuning type tuning circuit according to an embodiment of the present invention, and FIG. 2 is a block diagram showing the configuration of a conventional voltage tuning type tuning circuit. (1)...Tuition selection IC (2)...CPU, (5)...
・EEPROM, (8)...D/A converter, (2
2)...Data ROM, (23)...Addition circuit. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

【特許請求の範囲】[Claims] (1)同調電圧データのうちの一部を記憶するEEPR
OMと、残りのデータを記憶するROMと、実行プログ
ラムを記憶するROMと、このROMに記憶されたプロ
グラムに従つて選局動作するCPUと、上記EEPRO
MおよびROMからそれぞれ読出されたデータを加算し
て元の同調電圧データを得る加算回路と、上記同調電圧
データをD/A変換するD/Aコンバータとを、同一チ
ップ上に形成したICにより構成したことを特徴とする
電圧同調型選局回路。
(1) EEPR that stores part of the tuning voltage data
OM, a ROM that stores the remaining data, a ROM that stores an execution program, a CPU that performs tuning operation according to the program stored in this ROM, and the EEPRO described above.
An adder circuit that adds the data read from M and ROM to obtain the original tuning voltage data, and a D/A converter that converts the tuning voltage data to D/A are configured by an IC formed on the same chip. A voltage-tuned tuning circuit characterized by:
JP12314189A 1989-05-16 1989-05-16 Voltage tuning type channel selection circuit Pending JPH02302116A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12314189A JPH02302116A (en) 1989-05-16 1989-05-16 Voltage tuning type channel selection circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12314189A JPH02302116A (en) 1989-05-16 1989-05-16 Voltage tuning type channel selection circuit

Publications (1)

Publication Number Publication Date
JPH02302116A true JPH02302116A (en) 1990-12-14

Family

ID=14853206

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12314189A Pending JPH02302116A (en) 1989-05-16 1989-05-16 Voltage tuning type channel selection circuit

Country Status (1)

Country Link
JP (1) JPH02302116A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2060528A1 (en) * 1992-10-21 1994-11-16 Fagor S Coop Ltda Programmable electronic tuner for collective TV aerials using analog memory

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5457901A (en) * 1977-10-18 1979-05-10 Sony Corp Channel selection unit
JPS5787624A (en) * 1980-11-20 1982-06-01 Toshiba Corp Code conversion circuit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5457901A (en) * 1977-10-18 1979-05-10 Sony Corp Channel selection unit
JPS5787624A (en) * 1980-11-20 1982-06-01 Toshiba Corp Code conversion circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2060528A1 (en) * 1992-10-21 1994-11-16 Fagor S Coop Ltda Programmable electronic tuner for collective TV aerials using analog memory

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