Communication terminal device

• US 5,930,372 A
• Filed: 07/18/1997
• Issued: 07/27/1999
• Est. Priority Date: 11/24/1995
• Status: Expired due to Term

• Current Assignee: Casio Computer Company Limited
• Original Assignee: Casio Computer Company Limited
• Inventors: Kuriyama, Yuji
• Primary Examiner(s): Lee, Ping
• Application Number:
  US08/875,804
• Time in Patent Office: 739 Days
• Field of Search: 381/71.2, 381/71.3, 381/71.13, 381/94.1, 381/71.1, 381/71.9, 381/71.14
• US Class Current: 381/71.9
• CPC Class Codes: G06F 1/1626 with a single-body enclosure integrating a flat display, e.g. Personal Digital Assistants [PDAs]
• CPC Class Codes: G06F 3/16 Sound input; Sound output speech processing G10L
• CPC Class Codes: G10K 11/17823 Reference signals, e.g. ambient acoustic environment
• CPC Class Codes: G10K 11/17873 using a reference signal without an error signal, e.g. pure feedforward
• CPC Class Codes: G10K 2210/11 Computers, i.e. ANC of the noise created by cooling fan, hard drive or the like
• CPC Class Codes: G10K 2210/115 Impact noise, e.g. from typewriter or printer
• CPC Class Codes: G10L 2021/02165 Two microphones, one receiving mainly the noise signal and the other one mainly the speech signal
• CPC Class Codes: G10L 21/0208 Noise filtering
• CPC Class Codes: G10L 21/0216 characterised by the method used for estimating noise
• CPC Class Codes: H04M 1/19 Arrangements of transmitters, receivers, or complete sets to prevent eavesdropping, to attenuate local noise or to prevent undesired transmission; Mouthpieces or receivers specially adapted therefor circuit arrangements for preventing eavesdropping H04M1/68; telephone cabinets E04H1/14

Abstract

A communication terminal device carries out data processing based on key or touch panel operations and provides a telephone conversation function. When a key is actuated, a key input confirmation sound is generated. When data input is performed on the touch panel with a pen, a pen impact sound caused by striking the touch panel with the pen and a pen frictional sound caused by rubbing the touch panel with the pen are generated. In the telephone conversation mode, the key input confirmation sound, the pen impact sound, and the pen frictional sound are picked up as noises by the microphone. Upon detecting such noises, the communication terminal device generates noise canceling signals corresponding to the respective noises and cancels each noise from a voice signal input from the microphone. Thus, a voice signal free from noises is transmitted.

Claims

1. A hand-held type communication terminal device comprising:

a touch panel for enabling a user to perform a data input operation using a pen;

a detector for detecting a movement of the pen;

a microphone for inputting a sound signal;

a memory for storing a pen frictional sound sample data;

a canceling signal generator for generating a cancel signal for canceling a pen frictional sound included in the sound signal which is input by the microphone using the pen frictional sound sample data stored in the memory when the detector detects the movement of the pen;

a noise canceler for processing the sound signal to eliminate the pen frictional sound therefrom using the cancel signal; and

a transmitter for transmitting the processed sound signal;

wherein said detector comprises means for detecting a rate of change of a position of the pen on said touch panel and means for comparing the rate of change with a threshold level to detect the movement of the pen.

2. A hand-held type communication terminal device according to claim 1, wherein said canceling signal generator generates the cancel signal to correspond to a level of the pen frictional sound included in the sound signal which is input by the microphone.

3. A hand-held type communication terminal device according to claim 1, further comprising a delay circuit through which the sound signal input by the microphone is supplied to the noise canceler.