Call prompt method

Patent metadata

Field	Value
Publication number	US-11653184-B2
Application number	US-202117237161-A
Country	US
Kind code	B2
Filing date	Apr 22, 2021
Priority date	Dec 31, 2015
Publication date	May 16, 2023
Grant date	May 16, 2023

Abstract

A call prompt methods and terminals. One example method includes displaying a first interface on a display screen of a first terminal, showing that the first terminal is in a call with a second terminal via a CDMA communication network, while the first terminal is in the call with the second terminal, displaying a second interface on the display screen that prompts that a third terminal is initiating a call to the first terminal. Outputting a sound that includes a prompt tone and a call voice between the first terminal and the second terminal, the prompt tone that the third terminal is initiating a call to the first terminal, and when the call initiated by the third terminal is rejected by the first terminal's user, continuing output the call voice between the first terminal and the second terminal, and stopping output the prompt tone.

First claim

What is claimed is:

1. A call prompt method in a Code Division Multiple Access (CDMA) communication network, comprising:
displaying a first interface on a display screen of a first terminal, wherein the first interface shows that the first terminal is in a call with a second terminal via the CDMA communication network;
while the first terminal is in the call with the second terminal, displaying a second interface on the display screen of the first terminal, wherein the second interface prompts that a third terminal is initiating a call to the first terminal via the CDMA communication network;
outputting, on the first terminal, a sound, wherein the sound comprises a prompt tone and a call voice between the first terminal and the second terminal, the prompt tone is used to prompt a call event, and the call event indicates that the third terminal is initiating the call to the first terminal via the CDMA communication network;
while outputting the sound, determining, by the first terminal, that the call initiated by the third terminal to the first terminal is rejected by a user of the first terminal; and
in response to determining that the call initiated by the third terminal to the first terminal is rejected by the user of the first terminal, continuing output, on the first terminal, the call voice between the first terminal and the second terminal, and stopping output, on the first terminal, the prompt tone to stop prompting the call event.

2. The method according to claim 1 , wherein the first terminal receives the sound from the CDMA communication network, and stopping output, on the first terminal, the prompt tone comprises changing, in the received sound, an amplitude value of a frequency corresponding to the prompt tone.

3. The method according to claim 2 , further comprising detecting, by the first terminal, the prompt tone by using a linear spectrum detection method.

4. The method according to claim 3 , wherein a fundamental frequency of the prompt tone is a single-frequency tone that has a constant amplitude and a constant frequency; and
detecting, by the first terminal, the prompt tone by using the linear spectrum detection method comprises:
performing, by the first terminal, channel decoding and voice decoding on a received downlink signal to obtain pulse code modulation (PCM) data;
dividing the PCM data into multiple overlapping data frames;
multiplying each of the multiple data frames by a window function, and performing a Fourier transformation to obtain a complex spectrum;
calculating, at each pre-estimated frequency, a correlation coefficient between complex spectra of a previous frame and a current frame in a relaxation period; and
determining, by the first terminal, that the prompt tone is detected on a corresponding frequency in response to the correlation coefficient exceeding a preset threshold.

5. The method according to claim 4 , further comprising:
after the first terminal receives the call initiated by the third terminal, obtaining, according to network information obtained by the first terminal by parsing a system broadcast message of a current cell, prompt tone information pre-stored in the first terminal, and detecting a prompt tone in the downlink signal according to the pre-stored prompt tone information; and
after determining, by the first terminal, that the prompt tone is detected on the corresponding frequency:
comparing a frequency and an amplitude of the detected prompt tone with a frequency and an amplitude in the prompt tone information pre-stored in the first terminal; and
in response to either determining that the frequency and the amplitude of the detected prompt tone are the same as the frequency and the amplitude in the prompt tone information pre-stored in the first terminal, or determining that differences between the frequency and the amplitude of the detected prompt tone and the frequency and the amplitude in the prompt tone information pre-stored in the first terminal do not exceed comparison thresholds, determining, by the first terminal, that the prompt tone is detected.

6. A first terminal used in a Code Division Multiple Access (CDMA) communication network, comprising at least one processor, a transceiver, one or more memories, a display screen, an audio frequency circuit, and a bus, wherein:
the transceiver is configured to communicate with the CDMA communication network;
the display screen is configured to display a first interface and a second interface;
the audio frequency circuit is configured to output a sound; and
the one or more memories coupled to the at least one processor and storing programming instructions for execution by the at least one a processor to perform operations comprising:
displaying a first interface on a display screen, wherein the first interface shows that the first terminal is in a call with a second terminal via the CDMA communication network;
while the first terminal is in the call with the second terminal, displaying a second interface on the display screen, wherein the second interface prompts that a third terminal is initiating a call to the first terminal via the CDMA communication network;
instructing the audio frequency circuit to output the sound, wherein the sound comprises a prompt tone and a call voice between the first terminal and the second terminal, the prompt tone is used to prompt a call event, and the call event indicates that the third terminal is initiating the call to the first terminal via the CDMA communication network;
while instructing the audio frequency circuit to output the sound, determining that the call initiated by the third terminal to the first terminal is rejected by a user of the first terminal; and
in response to determining that the call initiated by the third terminal to the first terminal is rejected by the user of the first terminal, instructing the audio frequency circuit to continue outputting the call voice between the first terminal and the second terminal, and to stop outputting the prompt tone to stop prompting the call event.

7. The first terminal according to claim 6 , wherein the first terminal receives the sound from the CDMA communication network, and instructing the audio frequency circuit to stop outputting the prompt tone comprises changing, in the received sound, an amplitude value of a frequency corresponding to the prompt tone.

8. The first terminal according to claim 7 , wherein the first terminal detects the prompt tone in the received sound by using a linear spectrum detection method.

9. The first terminal according to claim 8 , wherein a fundamental frequency of the prompt tone is a single-frequency tone that has a constant amplitude and a constant frequency, and the operations further comprise:
performing channel decoding and voice decoding on a received downlink signal to obtain pulse code modulation (PCM) data;
dividing the PCM data into multiple overlapping data frames;
multiplying each of the multiple data frames by a window function, and performing a Fourier transformation to obtain a complex spectrum;
calculating, at each pre-estimated frequency, a correlation coefficient between complex spectra of a previous frame and a current frame in a relaxation period; and
determining, by the first terminal, that the prompt tone is detected on a corresponding frequency in response to the correlation coefficient exceeding a preset threshold.

10. The first terminal according to claim 9 , wherein the operations further comprise:
after the first terminal receives the call initiated by the third terminal, obtaining, according to network information obtained by the first terminal by parsing a system broadcast message of a current cell, prompt tone informat

Assignees

• Huawei Tech Co Ltd

Inventors

• Jin Hui
• Wu Xiaoguang
• Jiang Kaiyu
• Tan Liwen

Classifications

• H04M1/724

  User interfaces specially adapted for cordless or mobile telephones · CPC title

• H04M3/4288

  Notifying a called subscriber of an incoming call during an ongoing call, e.g. Call Waiting · CPC title

• H04W4/16 Primary

  Communication-related supplementary services, e.g. call-transfer or call-hold · CPC title

• H04M1/72513

  On hold, intercom or transfer communication modes · CPC title