[특허]Digital voice switch

Digital voice switch 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G10L-001/04
출원번호	US-0679588 (1976-04-23)
발명자 / 주소	Jankowski Joseph Albin (Bethesda MD)
출원인 / 주소	Communications Satellite Corporation (Washington DC 02)
인용정보	피인용 횟수 : 101 인용 특허 : 0

초록 ▼

A digital voice switch for detecting speech signals in the presence of noise on a communication channel. The voice switch employs a threshold adjustment circuitry and three threshold detectors which include a speech detector, a noise detector and a disabling detector. The speech detector having a variable speech threshold level detects the presence of speech signals in the communication channel. The noise detector having a variable noise threshold level detects the presence of noise. The threshold adjustment circuitry, which is capable of providing rapid threshold adjustment, operates in conjunction with the noise detector to detect the noise level and to adjust the speech and noise threshold levels according to the level of the noise present in the communication channel. The disabling detector having a fixed maximum threshold level operates to disable the function of the threshold adjustment circuit while speech is present.

대표청구항 ▼

A digital voice switch for detecting speech signals in the presence of noise signals on a communication channel, where the signal in said channel is periodically sampled and encoded, comprising: a. threshold adjustment means having sources of speech threshold signals and noise threshold signals and means for adjusting said speech and noise threshold signals; b. speech detector means connected to receive said encoded signal samples and said speech threshold signal from said threshold adjustment means for comparing the magnitude of said samples with said speech threshold signal and for providing an output signal when said speech signals are determined to be present in said communication channel; c. noise detector means connected to receive said encoded signal samples and said noise threaded signal from said threshold adjustment means for comparing the magnitude of said samples with said noise threshold signal and for providing an output signal developed from comparison of the magnitude of said encoded signal with said noise threshold signal indicating the level of said noise signals in said communications channel; d. logic means connected to receive said output signal from said noise detector means and having a first state and a second state for applying command output signals to said threshold adjustment means when said logic means is in the first state and for not applying said command signals when said logic means is in the second state, said logic means being in the first state when the level of said noise signals exceeds a predetermined noise level or is less than a second predetermined noise level, and said command output signals causing said threshold adjustment means to adjust the values of said speech and noise threshold signals according to the level of said noise signals; e. a source of a disabling threshold signal; f. disabling detector means connected to receive said encoded signal samples and said disabling threshold signal from said source for providing an output signal when said encoded signal sample exceeds said disabling threshold signal; and g. disabling circuit means connected to receive said output from said disabling detector means and said output signal froM said speech detector means for triggering said logic means to the second state when said sample exceeds said disabling threshold signal and when said output signal from said speech detector means indicates the presence of speech signals in said communication channel.

이 특허를 인용한 특허 (101)

Stettiner Yoram (Ramat-Hasharon ILX) Adlersberg Shabtai (Petah-Tikva ILX) Aizner Mendel (Rishon-Le-Zion ILX), A method for indicating the presence of speech in an audio signal.
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Digital voice switch 원문보기

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