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Shenzhen Keyuan Precision manufactured co.,ltd
Tel: 0755-29569339
Fax: 0755-23723989
Contact person: Karen
Phone:18207552818
Email: sales1@keyuangd.com
Tel: 0755-29569339
Fax: 0755-23723989
Contact person: Karen
Phone:18207552818
Email: sales1@keyuangd.com
QQ:3156213106
Address:Building 2, No.80
Ditang road Shasan
community Shajing Street
Baoan District Shenzhen
Post code:518104
Address:Building 2, No.80
Ditang road Shasan
community Shajing Street
Baoan District Shenzhen
Post code:518104
Learning Remote Control
2015-04-02 15:10:59 From：Localhost Font-size：TTT
[Description]1, learning remote backgroundWith the rapid socio-economic development, gradually improving the people& 39;s living s
1, learning remote backgroundWith the rapid socio-economic development, gradually improving the people's living standards, household appliances penetration increased year by year, the type of household appliances is increasing. Market innovation, the emergence of various types of household appliances every year. All kinds of large appliances such as: home TV, VCD, air conditioner, DVD digital projectors, VCR, etc. constantly upgrading, due to a variety of devices comes with a remote control, and infrared remote control devices follow different rules are not the same manipulate these devices have to use a variety of remote control, a lot of inconvenience to the user. Produce universal learning remote control technology, especially learning remote control, a good solution to this problem
Combined with the entire transfer of digital television environment, learning remote control used in digital set-top boxes have become the first choice for many Internet companies, a good TV set-top box will combine the convenience of the user's operational use.
2, learning remote control principle
From now on the market mainly universal learning remote control, the main divided into two camps
(A) fixed code learning remote control
Such learning remote control using the "incomplete induction," that the market for the remote control signal is used to collect a large number of summary, the collection of signal classification, and "divide and rule" - for each category are prefabricated A decoding program and launch the program. Learning process in this way are:
collecting a, learning signal
b, category discriminating signal (belong A decoding scheme), coding, storage to the EEPROM.
Pros: This learning remote control hardware requirements are relatively simple, the main controller (master IC) operating frequency is not too high, because the transmission frequency signal, DUTY, coding, etc. are known, as long as the signal acquisition can discriminate; in addition to the memory capacity is relatively low because it does not exist compression problem, according to the most primitive of the most simple coding for storage.
Disadvantages: Only known remote control (or that has been collected signal) valid for the new development, the new encoding format on the powerless.
(B) waveform copy Learning Remote Control
Such remote control idea is: the signal emitted by the original remote control complete copy, regardless of what format the remote control, after appropriate compression, stored in the memory, when required transmit, then within the reservoir restore the original signal readout after decompression. At present, only Shenzhen Rui Esprit Technology Co., Ltd. is the adoption of this advanced learning.
This way of working process of these steps: collection of the original transmitted signal waveform to the master MCU RAM, analyze the signal, signal compression, storage signal.
a, to measure the transmitted signal waveform, requires the use of a high speed main control chip, the original signal acquisition is very precise, while using a relatively large signal as a cache RAM, this step is mainly the original signal is stored in the RAM cache.
b, signal analysis, the collected signal analysis, such as the periodic signal transmitted commonly high and low times, and other parameters for detailed analysis to facilitate the next compression.
c, coding, according to the usual high and low time, a special time of high and low, sending period, the original signal compression.
d, stored signal, the compressed data is stored after the number in EEPROM
Pros: You can use any learning remote control, you can use the program do not need to update the code all current and future learning all infrared remote control
Disadvantages: The main control chip and the memory of choice is higher than fixed. The overall cost is more expensive than a fixed code learning remote control