TH11293B - Microprocessor controlled digital AFT unit - Google Patents

Abstract

The TV tuner system includes a digital Auto Fine Tuning (AFT) unit for generating an AFT digital signal that represents the deviation of the frequency of the video signal conductors, the IF signal from the specified frequency value, the digital AFT unit is included. To the counter for counting the video signal conductor loop during the counting period, the IF sector segment, the counter, and at least the operating segment, the television receiver signal is integrated into a single microprocessor integrated circuit (IC). It is connected to the integrated circuit via a serial data bus under the control software program. This microprocessor (1) transmits information, regulates function and controls the count to the operating sector.The signal is passed through the serial data bus, (2) receives the count information from the counter through the serial data bus, and (3) receives its substantive value. Intermediate information to determine the deviation of the frequency of the IF visual conductor from its nominal frequency value.

Claims (4)

1. A complete set consisting of For tuning a radio frequency (RF) signal with a modulated conductor to produce an intermediate frequency (IF) signal, there is a modulated conductor corresponding to the modulated conductor of the Rf signal. Said and will have the specified frequency value For the demodulation of the said IF signal to produce a response signal. Sections for the operation of such response signals in accordance with the information controller duty. Section for the count of the aforementioned modulated loop count of the said IF signal during measurement intervals determined by the counting control information to produce information. The number that represents the frequency of such information. It supports the signal conductors for the IF signal. A serial data bus is attached to the said response and counting section and the operating section under the control software program. (1) Transmission of such duty control information to the aforementioned response signal operations and through the said serial data bus and for the transmission of such counting control information to the said counting segment via the bus. The aforementioned serial data; (2) obtaining the number and such data from the aforementioned counting section via the data bus through the said serial data bus and (3) finding the said count data. To determine the frequency deviation of said modulated conductors of the said IF signal from the aforementioned frequency values. 2. The unit specified in item 1, where the operating part consists of the amplification section. Such IF and At a minimum, such an expansion and counting section is contained within an integrated circuit (IC). 3. The finished machine consisting of Section for the provisioning of a radio frequency (RF) signal with a modulated conductor. Section for generating a specific distance (LD) oscillator signal corresponding to the selected channel. The section for the inclusion of such Rf signals with such LO signals to produce an intermediate frequency (IF) signal with a modulated conductor corresponding to the said modulated conductor of the said Rf signal and has Specified frequency value Section for amplification of the said IF signal, Section for demodulating the said IF signal to produce a response signal. Sections for the operation of such response signals in accordance with the information controller duty. Section for the count of the aforementioned modulated loop count of the said IF signal during measurement intervals determined by the counting control information to produce information. The number that represents the frequency of such information. It supports the signal conductors for the IF signal. A serial data bus is attached to the said response and counting section and the operating section under the control software program. (1) transmission of information controlling the said duty to the said operation And the counting control information goes to the aforementioned counting segment via the a said serial data bus; (2) obtaining the number and such information from the said counting segment via the data bus through that serial data bus; and (3) ) To find the value of the said contents To determine the frequency deviation of the aforementioned modulated conductors of the said IF signal from the aforementioned frequency values, where such a count will produce a digital value that represents that amount of information. Such a data bus can pass a given number of bits per data value and that is aggregated for at least part of that digital modulation that represents that amount of information. To produce another digital value that replaces the aforementioned information and contains no more than the specified number of bits 4. A complete set consisting of For tuning a radio frequency (RF) signal with a modulated conductor to produce an intermediate frequency (IF) signal, there is a modulated conductor corresponding to the modulated conductor of the Rf signal. Said and will have the specified frequency value For the demodulation of the said IF signal to produce a response signal. Sections for the operation of such response signals in accordance with the information controller duty. Section for counting the aforementioned modulated loop count of the said IF signal during the measurement interval determined by the counting control information to produce information. The number that represents the frequency of such information. To support the signal conductors of the IF signal, a serial data bus is attached to the said response operation and counting segments for information communication in a format that includes write and read intervals; and The operating part under the control software program for (1) Transmission of such duty control information to the aforementioned response signal operations and through the said serial data bus and for the transmission of such counting control information to the said counting segment via the bus. (2) the receipt of such amount of information produced during the measurement period, which takes place within the beginning of the reading range. Through the aforementioned serial data bus between the latter part of the reading range, and (3) the determination of the said numerical test. To determine the frequency deviation of such modulated conductors of the said IF signal from the aforementioned frequency values.