Product Type: Phone speech card is specifically "computer and phone speech processing card", also known as "voice board." It is a computer plug-in for a computer and can implement voice processing. According to the telecom buffer interface, the current speech card can be divided into two categories of analog relay voice cards and digital relay voice cards, and other processing cards that provide multi-functional services are used. According to the number of trunks, it can be divided into a relay card of the specific line, such as a 24-wire relay card, that is, it can take a 24-channel phone at the same time. The number of model telephone lines: The number of wireless lines means that the phone speech card can be connected to how many simulation calls, this indicator can be seen in its type. For example, the 24-wire relay card is 24 of the accessible analog call. Interface mode: About its interface, generally a PCI interface. The PCI interface is an interface that is more applications on the computer. Of course, there is also ISA. This interface is already unacceptable, and it is mostly this interface on the early speech card. There are also SC interfaces, which is the Subscriber Connector (Optical Fiber Connector), fiber optic connector. Gain: Simplely said that the gain of the phone card is that the signal is not strong as the signal on the line, and other electrical noise may enhance the process of useful signals when the call is affected, it can generally be divided into manual detection gain and automatic control gain. The development of modern communication technology has enabled existing products to automatically control gain products, and the artificial gain is almost not produced. Sampling frequency: sampling frequency, sampling frequency, refers to the number of acoustic samples per second. The higher the sampling frequency, the better the quality of the sound. The resolution of the human ear is very limited, so too high frequency will not distinguish it; the sampling frequency is generally divided into 22.05kHz, 44.1kHz, 48kHz three grades, 22.05 can only reach the sound quality of FM broadcast, 44.1KHz is CD Sound quality, 48kHz is the DVD Audio or professional field. DSP firmware: DSP: Digital Signal Processing, Digital Signal Processing. DSP technology has a wide range of applications in analog electronic fields such as tone control, distortion effects. At the same time, the DSP can also show up in a variety of effects such as simulation equalization and reverb. DSP action can be handled by computer CPU or dedicated DSP chips, and different, dedicated DSP chip processing is more optimized than computer CPU, faster. The DSP firmware here refers to the embedded DSP chip. Processor structure: The processor structure refers to the type of DSP processor and CPU processor installed by the phone voice card. Because the function of the phone voice card does not require a very powerful sound and CPU processor, the processor on the phone speech card is generally not a mainstream CPU processor. However, there is also a powerful phone voice card that uses the Pentium and Pentium-level CPUs, and some have modulated demodulation processing chips. Signal detection: Signal detection refers to the function of automatic detection of signals on the line on the line voice card, such as accurate detection of arbitrary order / double audio and identifying hanging machine. Support software: Support software means which system platform can be worked under the system platform, and now the speech card is almost all of the support of various operating systems such as Windows, Linux, UNIX, and DOS. Phone speech cards for support under Mac operating systems are not much more common. Other features: Other features, in addition to the most basic functions of the phone voice card, other aspects of other specific functions, such as a reliable dual-tone multi-frequency button (DTMF) detection, can be recorded and played At the same time, the DTMF button is immediately responded. Unique signal sound generation (Detection) and recognition algorithm, accurately identify an audio signal of any frequency or an audio signal that produces any frequencies. Reliable ringing detection of two-wire simulation relay. With polar reversal and speech recognition, the other party is accurately identified.
