TH6372B - The use of the first center frequency, which is 43.5 MHz or less, in FM radio and television tuners. - Google Patents

Abstract

television receiver Includes a single tuner for tuning TV channels. and the FM station used to spread out The tuner was made work with a given rate of growth which is adjusted in the FM receiving mode The tuner acts as a converter sector. Part one of the multiplicative FM receiver, where the mixer of the FM radio integrated circuit Acting as a second converter, such placement will operate at the first IF frequencies specific to and not specific to the FM receivers, which can be used to receive broadcasts from the National Broadcasting Service (NWS). Automatically at one of the seven preset frequencies of the NWS operating in the listener's area, the receiver will display on the screen the number of FM system channels being tuned.

Claims (2)

1. A television receiver consists of a tuner path, which operates in mode one to receive the television's RF signal. This tuner path selects a specific television RF signal from a number of existing television RF signals in response to a control signal. A control path generates this control signal to enable the tuner path to select the specific RF signal. This tuner path also operates in mode two as the first stage frequency converter for the FM radio receiver with exponential conversion, to receive the R7 signal of the FM radio broadcast. This tuner path selects a specific FM radio RF signal from a number of existing FM radio RF signals in response to the control signal and converts this specific FM radio RF signal to the first intermediate frequency (CEF). The second stage frequency converter of the FM radio receiver with exponential conversion receives the FM radio signal... The aforementioned FM radio signal is broadcast at the first intermediate frequency, and a path is used to demodulate the audio signal from the FM radio signal broadcast at the second intermediate frequency, where the first intermediate frequency is 43.3 MHz. 2. The television receiver consists of a tuner path, which operates in mode one to receive the television's RF signal. This tuner path selects a specific television RF signal from a number of existing television RF signals in response to a control signal. A control path generates this control signal to enable the tuner path to select the specific RF signal. This tuner path also operates in mode two as the first stage frequency converter for the FM radio receiver with exponential conversion, to receive the R7 signal of the FM radio broadcast. This tuner path selects a specific FM radio RF signal from a number of existing FM radio RF signals in response to the control signal and converts this specific FM radio RF signal to the first intermediate frequency. The second stage frequency converter of the FM radio receiver with exponential conversion receives the FM radio signal... The aforementioned FM radio signal is transmitted at the first center frequency, and the FM radio signal transmitted at the second center frequency is converted, and the path is used to demodulate the audio signal from the FM radio signal transmitted at the second center frequency, and where the first center frequency is 43.3 MHz and greater than 42.17 MHz (Clause 2, 2 pages, 6 figures).