QN8075 데이터 시트보기 (PDF) - Unspecified

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QN8075

Single Chip Low Power FM Receiver for Portable Devices

Unspecified 

The following figure is measured at FM=88MHz. The RSSI Curve is not varied by FM frequency.

Figure 4 RSSI vs RF Input

3.2 Audio Processing

The MPX signal after FM demodulation is comprised

of left and right channel signal, pilot in the following

way:

Here, L(t) and R(t) correspond to the audio signals on

the left and right channels respectively, f = 19 kHz, θ is

the initial phase of pilot tone and α is the magnitude of

the pilot tone. In stereo mode, both L and R are

recovered by de-MPX. In mono mode, only the L+R

portion of audio signal exists. L(t) and R(t) are

recovered by de-MPX.

In receive mode, stereo noise cancellation (SNC) for

FM only, high cut control (HCC) and soft mute (SM)

are supported. Stereo noise suppression is achieved by

gradually combining the left and right signals to be a

mono signal as the received signal quality degrades.

SNC, HCC and SM are controlled by SNR and

multipath channel estimation results. The three

functions will be archived automatically in the device.

The QN8075 has an integrated mono or stereo audio

status indicator. There is also a Read ST_MO_RX

(Reg04h [0]) bit to get status. In addition, there also is a

force mono function to constrain output mono in

Reg00h[2].

Two selectable de-emphasis time constants (75us and

50us) supported.

Rev 0.2c (09/02)

Copyright ©2011 by Quintic Corporation

Page 10

Confidential A

Confidential Information contained herein is covered under Non-Disclosure Agreement (NDA).

Advance Technical Information. This is a product under development. Characteristics and specifications are subject to change without notice.

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