TWI387308B - Impedance setting modem and method - Google Patents

Description

Data machine and its impedance setting method

The invention relates to a data machine and a method for setting the impedance thereof.

VoIP (Voice over Internet Protocol) is one of the main technologies used by Internet telephony. In short, VoIP converts an analog sound signal into a digital signal, and performs instant transmission on the IP network in the form of a data packet, and converts the digital signal into an analog signal to the terminal.

Modem and telephone are indispensable components of the above VoIP, and the quality of the call of the Internet phone is closely related to the data machine and the telephone. When the data machine matches the phone, it can reduce the echo interference during the call and obtain better call quality. Wherein, the data machine and the telephone are matched, that is, the impedance of the data machine is made as close as possible to the impedance of the telephone by setting the impedance of the data machine.

Conventional methods generally use manual setting of the impedance of the data machine, which is quite time consuming and laborious, and it is difficult to ensure that the data machine matches the phone.

In view of the above, it is necessary to provide a data machine and its impedance setting method which can set the impedance quickly and accurately.

A data machine includes: a selection module for selecting one impedance of the data machine one by one; a setting module for setting a frequency of the signal to be transmitted to be 1 kHz; and a transmitting module for transmitting to the telephone at the frequency set as above a signal; a receiving module for receiving a feedback signal of the telephone; adding a module, When the signal sent to the phone is not 20KHz, the frequency of transmitting the signal to the phone is increased by 1KHz, and then the transmitting module sends a signal to the phone at the increased frequency; the computing module is configured to calculate the received feedback signal. The size, and when the signal sent to the phone is 20 kHz, the magnitudes of all the feedback signals calculated under the impedance are summed to obtain a total value of the feedback signal; the impedance setting module is used for all the data machines. When the impedance is selected, the impedance corresponding to the minimum summed value of all the feedback signal sum values is set to be the impedance of the data machine.

A data machine impedance setting method, the method comprising the steps of: (a) selecting an impedance of the data machine; (b) setting a frequency of the signal to be transmitted to be 1 kHz; (c) transmitting a signal to the telephone at the frequency set above; Receiving a feedback signal of the telephone; (e) calculating the size of the received feedback signal; (f) when the signal transmitted to the telephone is not 20 kHz, increasing the frequency of the signal transmitted to the telephone by 1 KHz, and returning to step c to The increased frequency sends a signal to the telephone; (g) when the signal sent to the telephone is 20 kHz, the magnitudes of all the feedback signals calculated in step e are summed to obtain a total value of the feedback signal; (h) for the data Each impedance loop of the machine is step b to step g until the summation value of the feedback signals corresponding to all the impedances of the data machine is calculated; (i) setting the impedance corresponding to the minimum sum value of all the feedback signal sum values is The impedance of the data machine.

The data machine and its impedance setting method can quickly and accurately set the impedance of the data machine to achieve an optimal match with the telephone, thereby effectively improving the call quality.

Referring to Figure 1, there is shown a hardware architecture diagram of a preferred embodiment of the data machine of the present invention. The data machine 10 is responsible for converting the analog sound signal sent by the user through the telephone 20 into a digital signal, and converting the received digital signal into an analog signal for transmission to the telephone 20. The modem 10 has a variety of impedances.

The data device 10 includes a storage device 100, a selection module 300, a setting module 301, a transmitting module 302, a receiving module 303, a computing module 304, a determining module 305, an adding module 306, and an impedance setting module 307. .

The storage device 100 is responsible for storing temporary data generated during the process of setting the impedance of the data machine 10.

The selection module 300 is used to select an impedance of the data machine 10.

The setting module 301 is configured to set a signal frequency to be transmitted to be 1 kHz.

The transmitting module 302 is configured to send a signal to the phone 20 at the frequency set above.

The receiving module 303 is configured to receive a signal (ie, a feedback signal) that the phone 20 returns.

The calculation module 304 is configured to calculate the size of the received feedback signal. Specifically, the calculation module 304 calculates the size of the feedback signal by using an FFT (Fast Fourier Transform) algorithm, that is, how many decibels (dB) the feedback signal has.

The determining module 305 is configured to determine whether the signal sent to the phone 20 is 20 kHz.

The adding module 306 is configured to increase the frequency of sending the signal to the phone 20 by 1 KHz when the signal sent to the phone 20 is not 20 KHz. The delivery module 302 transmits a signal to the telephone at the increased frequency described above.

The calculation module 304 is further configured to sum up the calculated sizes of all the feedback signals, and save the summed result (ie, the feedback signal total value) to the storage device 100.

The determining module 305 is further configured to determine whether all impedances of the data machine 10 have been selected.

The impedance setting module 307 is configured to set the impedance of the data machine 10 after all the impedances of the data machine 10 have been selected. Specifically, the impedance setting module 307 first selects a minimum summed value from all the feedback signal sum values stored in the storage device 100, and then sets the impedance corresponding to the minimum summed value to the impedance of the data machine 10.

Referring to Figure 2, there is shown a flow chart of a preferred embodiment of the data machine impedance setting method of the present invention.

In step S400, the selection module 300 selects an impedance of the data machine 10. The data machine 10 has a variety of impedances.

In step S401, the setting module 301 sets the frequency of the signal to be transmitted to be 1 kHz.

In step S402, the transmitting module 302 transmits a signal to the telephone 20 at the frequency set above.

In step S403, the receiving module 303 receives the signal (ie, the feedback signal) that the phone 20 returns.

In step S404, the calculation module 304 calculates the size of the received feedback signal. Specifically, the computing module 304 utilizes FFT (Fast Fourier Transform (Fast Fourier Transform) algorithm calculates the size of the above feedback signal, that is, how many decibels (dB) the feedback signal has.

In step S405, the determination module 305 determines whether the signal transmitted to the telephone 20 is 20 kHz.

If the signal sent to the telephone 20 is not 20 kHz, the process proceeds to step S406, the adding module 306 increases the frequency of transmitting the signal to the telephone 20 by 1 kHz, and then returns to step S402, and the transmitting module 302 transmits the frequency to the telephone 20 at the increased frequency. Send a signal.

If the signal sent to the telephone 20 is 20 kHz, the process proceeds to step S407, and the calculation module 304 adds up the sizes of all the feedback signals calculated in step S404, and adds the result obtained after the summation (ie, the feedback signal is added). The total value) is saved to the storage device 100.

In step S408, the determining module 305 determines whether all the impedances of the data machine 10 have been selected.

If all the impedances of the data machine 10 have been selected, the process proceeds to step S409, and the impedance setting module 307 sets the impedance of the data machine 10. Specifically, the impedance setting module 307 first selects a minimum summed value from all the feedback signal sum values stored in the storage device 100, and then sets the impedance corresponding to the minimum summed value to the impedance of the data machine 10.

In step S408, if the data machine 10 still has no impedance selection, the process returns to step S400 to continue selecting the next impedance of the data machine 10.

The above description is only the preferred embodiment of the present invention and has been widely used. Equivalent changes or modifications made without departing from the spirit of the invention are intended to be included within the scope of the appended claims.

10‧‧‧Data machine

20‧‧‧Phone

100‧‧‧Storage device

300‧‧‧Selection module

301‧‧‧Setup module

302‧‧‧Transmission module

303‧‧‧ receiving module

304‧‧‧Computation Module

305‧‧‧Judgement module

306‧‧‧Adding modules

307‧‧‧ impedance setting module

S400‧‧‧Select an impedance of the data machine

S401‧‧‧Set the frequency of the signal to be sent to 1KHz

S402‧‧‧Send a signal to the phone

S403‧‧‧Receive signal from receiving calls

S404‧‧‧ Calculate the size of the received feedback signal

S405‧‧‧ Is the above signal sent to the telephone 20KHz?

S406‧‧‧ Increase the frequency of signals sent to the telephone by 1KHz

S407‧‧‧ Add up the calculated size of all feedback signals

S408‧‧‧All impedances of the data machine have been selected

S409‧‧‧Set the impedance of the data machine

1 is a hardware architecture diagram of a preferred embodiment of a data machine of the present invention.

2 is a flow chart showing the operation of a preferred embodiment of the data machine impedance setting method of the present invention.

S400‧‧‧Select an impedance of the data machine

S401‧‧‧Set the frequency of the signal to be sent to 1KHz

S402‧‧‧Send a signal to the phone

S403‧‧‧Receive signal from receiving calls

S404‧‧‧ Calculate the size of the received feedback signal

S405‧‧‧ Is the above signal sent to the telephone 20KHz?

S406‧‧‧ Increase the frequency of signals sent to the telephone by 1KHz

S407‧‧‧ Add up the calculated size of all feedback signals

S408‧‧‧All impedances of the data machine have been selected

S409‧‧‧Set the impedance of the data machine

Claims (4)

A data machine includes: a processing module for converting an analog sound signal sent by a user through a telephone into a digital signal, and converting the digital signal received by the telephone into an analog signal for transmission to the telephone; and selecting a module for selecting data one by one An impedance of the machine; a setting module for setting a signal frequency to be sent to a telephone communicatively connected to the data machine to be 1 kHz; and a transmitting module for transmitting a signal to the telephone at the frequency set above; a receiving module, a feedback signal for receiving the phone; an adding module, configured to: when the frequency of the signal sent to the phone is not 20KHz, increase the frequency of the signal by 1KHz, and then send the signal to the phone by the sending module at the increased frequency a calculation module for calculating a size of the received feedback signal, and when the frequency of the signal sent to the telephone is 20 kHz, summing the magnitudes of all the feedback signals calculated under the impedance to obtain a total of the feedback signals Value; the impedance setting module is used to set the minimum of all the feedback signals plus when all the impedances of the data machine have been selected. Corresponding to the value of the impedance of the impedance data machine. The data machine of claim 1, wherein the computing module is further configured to save the total value of the feedback signal to a storage device of the data machine. A data machine impedance setting method includes the following steps: a. selecting an impedance of the data machine; b. setting a signal frequency to be sent to a telephone communicatively connected to the data machine 1KHz; c. transmitting a signal to the telephone at the frequency set above; d. receiving a feedback signal of the telephone; e. calculating a size of the received feedback signal; f. when the frequency of the signal transmitted to the telephone is not 20 kHz, After increasing the frequency of the signal by 1 kHz, returning to step c to send a signal to the telephone at the increased frequency; g. when the frequency of the signal transmitted to the telephone is 20 kHz, the size of all the feedback signals calculated in step e is performed. Adding to obtain a total value of the feedback signal; h. for each impedance loop of the data machine, step b to step g, until the total value of the feedback signal corresponding to all the impedances of the data machine is calculated; i. setting all feedback signals plus The impedance corresponding to the minimum summed value of the total values is the impedance of the data machine. The data machine impedance setting method according to claim 3, wherein the method further comprises: saving the feedback signal sum value to a storage device of the data machine.