Caller ID

[KhepeleSibilo]

پاسخ : Caller ID

اینم برای MT8870 و PIC16f84 ...

اون سیگنالهای CALLER ID  رو هم قبل رفتن می دم حتما ...

http://www.--.com/CONTROL_VIA_TELEFONO.pdf

[رضا حاجي زاده]

پاسخ : Caller ID

می دونی الان دارم به این نتیجه می رسم که من نمی تونم درست از این اطلاعات استفاده بکنم
ممنون
همه این فایل ها رو دارم همه کتاب و هم این فایل ولی ممنونم :biggrin:

[freedom_truth]

پاسخ : پاسخ : Caller ID

فعلا این رو داشته باشین،راجع به کالر ای دی نداره،اما ...
اونم می زارم
http://www.--.com/understanding_telephone_electronics.pdf

سلام
چرا لینک رو پاک کردی دوست عزیز؟!! www.--.com یعنی چی؟! البته من تازه اومدم تو این تاپیک ولی حدس میزنم قبلاً یه لینک اینجا بوده!!
به هر حال بهتره دوستان بدونند دوستمون با نام کاربری Khodahafez که قبلاً نام کاربریشون KhepeleSibilo بود طبق گفته خودشون قهرن و دیگه اینجا نمیان.(که امیدوارم اینطور نباشه)
دلیل این که لینک رو هم پاک کردن دقیقاً نمیدونم ولی من یه لینک در همین رابطه دارم که واستون میزارم و امیدوارم همونی باشه که ایشون گذاشته بودن:

http://rs26.rapidshare.com/files/4479810/Understanding_Telephone_Electronics.pdf

حجمش زیاد بود خودم نتونستم دانلود کنم.
موفق باشید

[Ehsan1985]

پاسخ : Caller ID

[left][left][center][pre][left][center]

Consumer Electronics Design
[img][/img]
EE498 -- Autumn 1995
Caller ID, DTMF, and Speech Chip
Information
Information about the Caller ID service
The Calling Line Indentification service is a subscriber feature that has been implemented in most major communities and is becoming more prevalent in smaller ones as well. This feature transmits data during the silent period between the first and second ring. The data is transmitted whether the caller is subscribed or not. The caller does have the option of preventing his/her information from being sent if he/she choses to do so. The Calling Line Identification service makes it possible to display a variety of data such as the number, time, and date of the incoming call as well as the name of the owner of the phone. Some limitations of caller id are discussed later in this section.

The data is transmitted serially between the first and second rings of the incoming call. The data is transmitted at 1200 bits per second in FSK mode. 1200 Hz represents a logical 1 (mark) and 2200 Hz a logical 0 (space). Each 8 bit word is preceded by a start bit (space) and followed by a stop bit (mark). Up to 10 mark bits can be added between words. To initialize the system, 30 bytes of 0101...are sent for the first 250 ms followed by 70 ms of marks.

Data Message Format

The data that is actually transmitted depends upon the format used by the telephone company providing the service. There are two basic formats being used right now:

* Single Data Message Format (SDMF)

* Multiple Data Message Format (MDMF)

Both formats are discussed below.

Single Data Message Format

The Single Data Message Format includes the data actual time and the phone number of the calling party. Figure 1 shows the single data message format in a timing diagram. The first part of the data is the message type, 04 hex for single message format. The second part transmitts the length of the message. This is followed by month, day, hour (24hr format), minute, and the number (up to 10 digits). If the calling party is out of your area or does not wish his/her information displayed, an "O" or a "P" is displayed instead of the number. The last part of the message is a checksum which equals the 2's compliment of the sum of all the bits in the word.

FIGURE 1:

For example the number 206 - 329 - 8524 calling at 2:30 p.m. on the 11-30-95 would be transmitted as follows:

{type} {length} 113014302063298524 {checksum}

The message type and the message length are sent in binary, while each character of the month, day, hour minute and telephone number are sent in standard 8-bit ASCII code.

Multiple Data Message Format

To be able to send more information through the phone line, the Multiple Data Message Format was created. In addition to the information sent by the single message format, this format also includes the name that the number calling you is registered to. Figure #2 shows a timing diagram of the multiple data message format.

FIGURE 2:

The messages delivered by the multiple data message format are broken into different parameters. For example, date and time of the incoming call is delevired in a different parameter as the calling number. The arrangement of these parameters within the message depends upon your local caller id provider. Figure 3 shows several different parameter types that can be included in the message. Again, the last piece of data in the message is a checksum which is the 2's compliment of all the bits of all the words in the data transmission. The MDMF is looking like it will become the standard of the future and SDMF will be phased out.

FIGURE 3:

Caller ID limitations

There are two basic limitations upon the caller id system. First, if the person who is calling does not wish for his/her information to be displayed on the caller id unit, the information can be blocked by entering a special code prior to dialing a phone number. In most areas, this code is *67. When the caller id unit encounters this situation, it displays an "P" for private to inform the person that the information has been blocked. The second limitation is that caller id will not be provided for those outside of your calling area. If someone dials in long distance, you would see a "O" for out of area displayed upon the caller id screen.

Information about Dual Tone Multi-Frequency
Dual Tone Multi-Frequency is a format for transmitting data by telephone and radio. It was first designed by engineers at Bell Labs to reliably sending the data across long distances over a variety of systems. Figure 4 shows the format of DTMF. Each digit is represented by two tones, determined by the intersection of the row and column where the digit sits. Two tones are used as opposed to one to provide protection against false digits appearing during transmission due to noise.

FIGURE 4:

An example of the use of DTMF is in dialing your telephone. If you have a touch tone phone, DTMF tones are sent out as your dial. The local telephone company recieves these tones, decodes them, and makes the connection. Another example is in calling your credit card company to check up on your account balance. When you are asked to enter your card number, you are sending out DTMF codes to be decoded at the other end.

[Ehsan1985]

پاسخ : Caller ID

آسی mt88e43 دیکودیر fsk یا همون caller id است و آسی mt8870 دیکودیر DTMF .