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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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TEA1095T Fiches technique(PDF) 6 Page - NXP Semiconductors |
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TEA1095T Fiches technique(HTML) 6 Page - NXP Semiconductors |
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6 / 28 page  1997 Nov 25 6 Philips Semiconductors Product specification Voice switched speakerphone IC TEA1095 FUNCTIONAL DESCRIPTION The values given in the functional description are typical values except when otherwise specified. A principle diagram of the TEA1096 is shown on the left side of Fig.3. The TEA1096 is a transmission and listening-in circuit. It incorporates a receiving amplifier for the earpiece, a transmit amplifier for the microphone, a loudspeaker amplifier and a hybrid. For more details on the TEA1096 circuit (please refer to Data Handbook IC03). The right side of Fig.3 shows a principle diagram of the TEA1095, a hands-free add-on circuit with a transmit amplifier, a receiver amplifier and a duplex controller. As can be seen from Fig.3, a loop is formed via the sidetone network in the transmission circuit and the acoustic coupling between loudspeaker and microphone of the hands-free circuit. When this loop gain is greater than 1, howling is introduced. In a full duplex application, this would be the case. The loop-gain has to be much lower than 1 and therefore has to be decreased to avoid howling. This is achieved by the duplex controller. The duplex controller of the TEA1095 detects which channel has the ‘largest’ signal and then controls the gains of the transmit amplifier and the receiver amplifier such that the sum of the gains remains constant. As a result, the circuit can be in three stable modes: 1. Transmit mode (Tx mode): the gain of the transmit amplifier is at its maximum and the gain of the receiver amplifier is at its minimum. 2. Receive mode (Rx mode): the gain of the receiver amplifier is at its maximum and the gain of the transmit amplifier is at its minimum. 3. Idle mode: the gain of the amplifiers is halfway between their maximum and minimum value. The difference between the maximum gain and minimum gain is called the switching range. Fig.3 Hands-free telephone set principles. handbook, full pagewidth MBG358 HYBRID DUPLEX CONTROL telephone line acoustic coupling sidetone TEA1096 TEA1095 |
Numéro de pièce similaire - TEA1095T |
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Description similaire - TEA1095T |
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