公开(公告)号：IT8449237D0

公开(公告)日：1984-12-03

申请号：IT4923784

申请日：1984-12-03

Applicant: MOTOROLA INC

Inventor： VILMUR RICHARD J ,  BERG DANIEL T

IPC: H04B1/40 ,  H04B

公开(公告)号：IT1178443B

公开(公告)日：1987-09-09

申请号：IT4923784

申请日：1984-12-03

Applicant: MOTOROLA INC

Inventor： VILMUR RICHARD J ,  BERG DANIEL T

IPC: H04B1/40 ,  H04B

公开(公告)号：GB2336019A

公开(公告)日：1999-10-06

申请号：GB9907067

申请日：1999-03-29

Applicant: MOTOROLA INC

Inventor： BERG DANIEL T ,  CICCHESE LUIGI

IPC: G02F1/13 ,  H04M1/02

Abstract: An electronic device 100, such as a wireless telephony device, has a housing 104, a display 324 and a gasket 300. The gasket 300 is compressible, and has a metallic layer on the surface 305 that is in contact with the display. The metallic layer is sufficiently compliable to conform to the surface of the display, and may be connected to a ground potential 328 on a circuit board 320. This prevents build up of harmful electrostatic charge on the display.

公开(公告)号：EP0165265A4

公开(公告)日：1985-12-30

申请号：EP84904314

申请日：1984-11-19

Applicant: MOTOROLA INC

Inventor： VILMUR RICHARD J ,  BERG DANIEL T

IPC: H04B1/40 ,  H04L5/14 ,  H04B3/20

CPC classification number: H04B1/408

Abstract: A duplex FM communication transceiver (10) in which the problem of requiring additional costly apparatus to separately generate a modulated transmit carrier signal and a receiver first mixer injection signal is solved by utilizing the modulated transmit carrier signal as the receiver first mixer (32) injection signal. The receiver portion (27-46) of the transceiver (10) comprises dual conversion circuitry, and the transmit information signal used for modulating the transmit carrier signal is phase and amplitude adjusted and then utilized to modulate the receiver second injection local oscillator (41) which provides the input injection signal to the receiver second mixer (36). The second mixer (36) substantially cancels all of the transmit information signal previously introduced into the receiver path by the first mixer (32) and provides only received information signals to a demodulator (43) which provides audio signals to a speaker (46).

Abstract translation: 一种双工FM通信收发信机（10），其中通过利用调制的发射载波信号作为接收机第一混频器（32）注入来解决需要额外昂贵的设备分别生成调制的发射载波信号和接收机第一混频器注入信号的问题 信号。 收发器（10）的接收器部分（27-46）包括双转换电路，并且用于调制发送载波信号的发送信息信号经过相位和幅度调整，然后用于调制接收器第二次注入本地振荡器（41） 其将输入注入信号提供给接收器第二混频器（36）。 第二混频器（36）基本上抵消了先前由第一混频器（32）引入接收机路径的所有发射信息信号，并且仅将接收到的信息信号提供给向扬声器（46）提供音频信号的解调器（43）。